CN107675101B - A kind of corrosion-resistant railway bolt and railway spike steel and its manufacturing method - Google Patents
A kind of corrosion-resistant railway bolt and railway spike steel and its manufacturing method Download PDFInfo
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- CN107675101B CN107675101B CN201710698275.0A CN201710698275A CN107675101B CN 107675101 B CN107675101 B CN 107675101B CN 201710698275 A CN201710698275 A CN 201710698275A CN 107675101 B CN107675101 B CN 107675101B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 120
- 239000010959 steel Substances 0.000 title claims abstract description 120
- 238000005260 corrosion Methods 0.000 title claims abstract description 74
- 230000007797 corrosion Effects 0.000 title claims abstract description 74
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 124
- 238000001514 detection method Methods 0.000 claims abstract description 64
- 238000005096 rolling process Methods 0.000 claims abstract description 59
- 238000010438 heat treatment Methods 0.000 claims abstract description 44
- 238000009749 continuous casting Methods 0.000 claims abstract description 42
- 238000003723 Smelting Methods 0.000 claims abstract description 40
- 238000010583 slow cooling Methods 0.000 claims abstract description 40
- 238000007670 refining Methods 0.000 claims abstract description 27
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 15
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 34
- 239000000463 material Substances 0.000 claims description 31
- 238000013019 agitation Methods 0.000 claims description 26
- 238000012360 testing method Methods 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 17
- 229910052742 iron Inorganic materials 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 14
- 239000002893 slag Substances 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 14
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- 238000005098 hot rolling Methods 0.000 claims 1
- 238000004886 process control Methods 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 10
- 238000009628 steelmaking Methods 0.000 description 5
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- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
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- 241001062472 Stokellia anisodon Species 0.000 description 1
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- 229910001566 austenite Inorganic materials 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/50—Road surface markings; Kerbs or road edgings, specially adapted for alerting road users
- E01F9/553—Low discrete bodies, e.g. marking blocks, studs or flexible vehicle-striking members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of corrosion-resistant railway bolt and railway spike steel and its manufacturing method, steel at being grouped as and mass percentage: C:0.05~0.10%, Si:0.10~0.15%, Mn:0.10~0.50%, P:0.030~0.045%, S≤0.010%, Cr:0.15~1.00%, Ni:0.10~0.45%, Cu:0.15~0.35%, V:0.04~0.10%, Mo:0.10~0.40%, N:0.010~0.015%, Al >=0.020%, surplus are Fe and inevitable impurity；Manufacturing method includes converter smelting, LF refining, VD vacuum processing, continuous casting, slow cooling, heating and rolling, flaw detection process.Steel produced by the invention has corrosion resistance, can make railway bolt and railway spike steel, is suitable for tunnel and the rainwater higher railway region of humidity such as frequently.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of corrosion-resistant railway bolt and railway spike steel and its manufacturer
Method.
Background technique
Bolt and railway spike are mainly used as the connection of rail and spring or the components such as rail and sleeper on railway, use ring
Border is more severe.It is penetrated by rain drop erosion, burning sun exposure, high temperature, dust, external force vibration etc. influences, especially dark and damp in tunnel
Under environment, just starts within 1~2 year after installation corrosion, abrasion, generates defect, generally using needing whole replacements after 5 years.It is general to use
The round steel of the materials such as Q235,20MnTiB is forged etc. to be process, and the present invention develops one kind by adding corrosion-resistant element
Corrosion-resistant round steel can extend the use time of railway bolt and railway spike.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of corrosion-resistant railway bolt and railway spike steel；The present invention also provides
A kind of manufacturing method of corrosion-resistant railway bolt and railway spike steel.The present invention overcomes the perishable situation of existing steel grade, warps
It crosses after neutral salt spray test with respect to common material rate of corrosion≤50%.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of corrosion-resistant railway bolt and railway spike
With steel, the railway bolt and railway spike steel chemical composition composition and mass percentage are as follows: C:0.05~0.10%, Si:0.10
~0.15%, Mn:0.10~0.50%, P:0.030~0.045%, S≤0.010%, Cr:0.15~1.00%, Ni:0.10~
0.45%, Cu:0.15~0.35%, V:0.04~0.10%, Mo:0.10~0.40%, N:0.010~0.015%, Al >=0.020%,
Surplus is Fe and inevitable impurity.
Railway bolt and railway spike of the present invention steel tensile strength >=450MPa, yield strength >=305MPa are had no progeny and are prolonged
Stretch rate >=30%, room temperature KV2>=200J, 0 DEG C of KV2>=130J, -40 DEG C of KV2>=34J, the relatively corrosive rate of material after salt spray test≤
50%。
The present invention also provides the manufacturing methods of a kind of corrosion-resistant railway bolt and railway spike steel, and the method includes converters
Smelting, LF refining, VD vacuum processing, continuous casting, slow cooling, heating and rolling, flaw detection process；The continuous casting working procedure, uses crystallizer
Electromagnetic agitation.
Converter smelting process of the present invention carries out converter smelting after molten iron pretreatment, controls converter terminal C≤0.05%.
LF refining process of the present invention controls LF finishing slag FeO content≤0.4%, FeO+MnO≤0.5%, C≤1%, control
N:100~200ppm in steel.
VD of the present invention is vacuum-treated process, controls VD vacuum degree≤200Pa, 10~20min of vacuum time.
Continuous casting working procedure of the present invention, in continuous casting process use M-EMS, electromagnetic agitation electric current 150~
300A, 3~10Hz of electromagnetic agitation frequency.
Slow cooling operation of the present invention is put into rapidly burial pit after slab cutting and carries out slow cooling, enters to cheat temperature >=600 DEG C,
Temperature≤200 DEG C are cheated out.
Heating of the present invention and rolling process, 1100~1250 DEG C of heating temperature；Control start rolling temperature 920~1000
DEG C, 950~1050 DEG C of finishing temperature.
Flaw detection process of the present invention, is detected a flaw using ET+UT, and ET flaw detection 0.5 × 20mm of precision, UT detect a flaw precision as Φ
0.5×12.7mm
The effect and mechanism of each essential element of the present invention:
Consider on the one hand the material is to ensure that the mechanical property requirements that railway uses, it is resistance to big on the other hand also to improve its
The performance of gas corrosion.Therefore, on the one hand to use lower C content and certain Ni, Mo, Al content tough to improve its low temperature
Property, certain Mn, V, N is added on the other hand to improve its intensity, certain Cr, Ni, Cu, P is added additionally to improve
Its corrosion resistance.Meanwhile will also be under the premise of this component system, the cleanliness of strict control molten steel reduces field trash pair
The influence of the fatigue life of material, and the uniformity of steel product ingredient is improved as far as possible, control composition segregation, to improve its performance
Stability.
Influence of the alloying element to railway bolt and railway spike Steel Properties:
C:C is the essential element of steel grade, it directly affects the intensity, toughness and plasticity of steel.With the raising of C content,
The strength of materials, hardness improve, toughness, plasticity and atmospheric corrosion resistance decline.It is intensity, hardness, wear-resisting if C content is too low
Property decline, the design requirement of railway bolt and railway spike is not achieved.Comprehensively consider based on the above issues, C content is designed 0.05
~0.10%.
Si:Si is the important deoxidier and reducing agent of steelmaking process, can be dissolved in ferrite and austenite and improve steel
Intensity and hardness, when steel containing Si is heated in oxidizing atmosphere, surface will form one layer of SiO2Film, to improve material in high temperature
When inoxidizability.Though but Si too high levels can improve the intensity of steel, can reduce the plasticity and toughness of steel, therefore the design of Si content is existed
In 0.10~0.15% range.
Mn:Mn can improve the intensity of steel, and can infinitely be dissolved with Fe, influence while improving intensity to plasticity compared with
It is small, therefore Mn content is designed in 0.10~0.50% range.
Solution strengthening and the cold hardening effect of P:P very well, is used in combination with Cu, is remarkably improved Hi-Stren steel
Atmospheric corrosion resistance, but excessively high P content will reduce its low-temperature flexibility.Comprehensively consider for these reasons, P content is designed
In 0.030~0.045% range.
S:S is mainly that the form of FeS, MnS exist in steel, can significantly improve steel machinability, but due to FeS and
Fe can form the compound of low melting point, and when being heated to 1000 DEG C or more, FeS compound melts too early and cause the crackle of steel
Sensibility, therefore in the invention of railway bolt and railway spike Steel material, design S content should be not more than 0.010%.
Cr:Cr can improve the intensity and wearability of steel, and without making material become fragile, certain Cr element, which is added, so that material is had
There is good weather-resistant to act on, therefore designs Cr content in 0.15~1.00% range.
Ni:Ni can improve the intensity, toughness and harden ability of steel, while can also greatly improve the low-temperature impact of steel and corrosion-resistant
Performance, while Cu element bring crack sensitivity can also be eliminated；But Ni element is especially sensitive to white point, especially in cargo sweat
It inevitably will penetrate into H element in steel in the process, therefore designing Ni content is 0.10~0.45%.
Cu:Cu element can greatly improve the corrosion resistance of steel in an atmosphere, and especially cooperation P is used.The control of Cu content
In 0.15~0.35% range, corrosion fatigue life is 2~5 times of common steel grade.
Mo:Mo can significantly improve harden ability in steel, improve steel belt roof bolt stability, improve the low-temperature impact resistance of steel
Can, while the ion corrosion resistance of resistance to H of steel can also be improved, especially suitable for the steel material of moisture resistance humid atmospheric corrosion, but Mo is expensive
Heavy metal, excessively high Mo content will be such that production cost rises, therefore the Mo content for designing steel grade is 0.10~0.40%.
V, N:V and N has extremely strong affinity, and the two forms stable nitridation vfanadium compound and can refine in crystal boundary precipitation
Crystal grain increases temper resistance and wearability, improves the intensity, yield tensile ratio and cryogenic property of steel, moreover it is possible to reduce material heat treatment
When Decarburization Sensitivity.But V, N content improves again after reaching a certain level, will be no longer particularly evident to the contribution of intensity, therefore
The V content of steel grade is designed in 0.04~0.10% range, N content is in 0.010~0.015% range.
Al:Al element is common deoxidant element, when being added in steel as alloy element, can obviously refine crystalline substance
Grain fixes the N in steel, to significantly improve the impact flexibility of steel, while can also reduce cold short tendency and timeliness tendentiousness, with
The elements such as Mo, Cu, Si, Cr are used cooperatively, moreover it is possible to improve the corrosion resistance of steel.But the heat that excessively high Al content will affect steel adds
Work performance and machinability, thus the Al content in designing material is not less than 0.020%.
Influence of the field trash to railroad spike and bolt steel in steel: railroad spike and bolt are during military service, meeting
More frequent external force vibration is born, phenomenon of rupture occurs for occasional within the period of being on active service, and formation of crack tends to occur at larger
At the field trash of grain.Thus, for railway railway spike and bolt, strict control process for making is answered, reduces the total of steel inclusion
Amount and size.
The reasons why production technology of the present invention is set:
(1) process for making
Because material needs to control lower and stable S content, the larger fluctuation of S content in molten iron should be avoided, therefore is needed
De- S pretreatment is carried out to molten iron；C content is lower in material, therefore requires converter tapping C≤0.05%；Field trash in material is to it
Service life has larger impact, should improve molten steel deep deoxidation effect, to reduce the amount of inclusions in steel, therefore requires LF whole
FeO≤0.4% in point slag；Simultaneously as performance requirement, need to carry out V, N to material to strengthen, therefore should be in LF terminal by N content
Control is in 100~200PPm；Material contains Cr containing Ni, sensitive to white point, needs to carry out vacuum outgas to molten steel, but also to guarantee one
Fixed nitrogen content, thus vacuum degree and processing time when being vacuum-treated to VD is needed to be set, it is desirable that vacuum degree≤
200Pa, 10~20min of vacuum time；Cr, Ni are sensitive to white point in steel, it is desirable that slab cheat at 600 DEG C or more cold, cheats out
Temperature≤200 DEG C give H element and the time are adequately precipitated.
(2) steel rolling process
To ensure slab heating effect, control heating temperature is 1100~1250 DEG C；The start rolling temperature of continuous rolling production line is very
Finishing temperature is controlled in big degree, low rolling temperature can obtain tiny crystal grain and preferable surface quality, to material
Mechanical performance, corrosion resisting property are all beneficial, but also bring along biggish mill load simultaneously, comprehensively consider set start rolling temperature as
920~1000 DEG C, 950~1050 DEG C of finishing temperature；Cr, Ni are sensitive to white point in steel, it is desirable that wind sheltering heap is cold after stocking, gives
The time is adequately precipitated in H element；As railway screw bolt and nut, there are no small influence, thus material safely on railway operation
Defect strictly to control, it is desirable that stocking 100% is detected a flaw, flaw detection precision using ET detect a flaw 0.5 × 20mm of precision, UT flaw detection
Precision is 0.5 × 12.7mm of Φ.
The corrosion-resistant railway bolt of the present invention and railway spike steel refer to detection method and include 1. GB/T228.1 material during tensile
Test method part 1-room temperature test method；2. GB/T229 metal Charpy-type test method；3. GB/T10125 manufactured gas
Atmosphere corrosion test-salt spray test.
The beneficial effects of adopting the technical scheme are that the 1, present invention uses low-carbon in terms of composition design, and
A certain amount of Si, Mn, Cr, Ni, V, N, Mo, while strict control S content are added, so that material has good room temperature and low temperature
Mechanical performance, while Cr, Ni, Cu, P, Al being cooperated and are added, improve the corrosion resistance of material.2, steel of the present invention by smelt,
After continuous casting, heat treatment, rolling and flaw detection, steel tensile strength >=450MPa, yield strength >=305MPa, elongation after fracture >=30%,
Room temperature KV2>=200J, 0 DEG C of KV2>=130J, -40 DEG C of KV2>=34J, relatively corrosive rate≤50% of material after salt spray test.3, this hair
It is bright meeting the bolt of manufacture and under the premise of railway spike service performance, effectively improve corrosion resistance, extend railway bolt and
Railway spike uses the time.4, steel produced by the invention tests prove that have good corrosion resistance, can be used as railway bolt and
Railway spike steel, especially suitable for tunnel and the rainwater higher railway region of humidity such as frequently.
Detailed description of the invention
Fig. 1 is that the corrosion-resistant railway bolt of embodiment 1 and railway spike steel roll state surface layer metallographic structure figure；
Fig. 2 is that the corrosion-resistant railway bolt of embodiment 1 and railway spike steel roll state center portion metallographic structure figure；
Fig. 3 is the railroad spike pictorial diagram of the corrosion-resistant railway bolt of embodiment 1 and railway spike steel making；
Fig. 4 is the railroad spike of the corrosion-resistant railway bolt of embodiment 1 and railway spike steel making after 120 hours salt spray tests
Exterior appearance figure；
Fig. 5 is that railway spike uses position view.
Specific embodiment
The present invention will be further described in detail with attached drawing combined with specific embodiments below.
The manufacturing method of corrosion-resistant railway bolt and railway spike steel includes converter smelting, LF refining, VD vacuum processing, connects
Casting, slow cooling, heating and rolling, flaw detection process, specific process step are as described below:
(1) converter smelting process: converter smelting is carried out after molten iron pretreatment, controls converter terminal C≤0.05%；
(2) LF refining process: control LF finishing slag FeO :≤0.4%, FeO+MnO≤0.5%, C≤1%, N:100 in steel~
200PPm；
(3) VD is vacuum-treated process: control VD vacuum degree≤200Pa, 10~20min of vacuum time；
(4) M-EMS, electromagnetic agitation 150~300A of electric current, electromagnetism continuous casting working procedure: are used in continuous casting process
3~10Hz of stirring frequency；
(5) slow cooling operation: it is put into burial pit rapidly after slab cutting and carries out slow cooling, enters and cheats temperature >=600 DEG C, cheat temperature out
≤200℃；
(6) heating and rolling process: 1100~1250 DEG C of slab heating temperature of control；Tandem rolling start rolling temperature 920~1000
DEG C, 950~1050 DEG C of finishing temperature；
(7) flaw detection process process: stocking flaw detection is detected a flaw using ET+UT, ET flaw detection 0.5 × 20mm of precision, UT flaw detection precision
For 0.5 × 12.7mm of Φ.
Embodiment 1
The chemical component of the corrosion-resistant railway bolt of the present embodiment and railway spike steel composition and mass percentage are shown in Table 1.
The manufacturing method of the corrosion-resistant railway bolt of the present embodiment and railway spike steel includes converter smelting, LF refining, VD vacuum
Processing, continuous casting, slow cooling, heating and rolling, flaw detection process, specific process step are as described below:
(1) converter smelting, converter terminal C:0.05% converter smelting process: are carried out after molten iron pretreatment；
(2) LF refining process: LF finishing slag FeO:0.4%, FeO+MnO:0.5%, C:1%, N:100PPm in steel；
(3) VD is vacuum-treated process: VD vacuum degree 67Pa, vacuum time 10min；
(4) M-EMS, electromagnetic agitation electric current 150A, electromagnetic agitation continuous casting working procedure: are used in continuous casting process
Frequency 3Hz；
(5) slow cooling operation: it is put into burial pit rapidly after slab cutting and carries out slow cooling, enters to cheat 657 DEG C of temperature, cheats temperature out
130℃；
(6) heating and rolling process: 1100 DEG C of slab heating temperature；952 DEG C of tandem rolling start rolling temperature, 981 DEG C of finishing temperature；
(7) flaw detection process process: stocking flaw detection is detected a flaw using ET+UT, ET flaw detection 0.5 × 20mm of precision, UT flaw detection precision
For 0.5 × 12.7mm of Φ.
The corrosion-resistant railway bolt of the present embodiment and railway spike are shown in Table 2 with steel mechanical property testing result；Salt spray test examines knot
It is similar to Example 1 that fruit is shown in Table 3(embodiment 2-7 salt spray test inspection result, therefore omits).
Fig. 1 is shown in the state surface layer metallographic structure of rolling of the corrosion-resistant railway bolt of the present embodiment and railway spike steel；
Fig. 2 is shown in the state center portion metallographic structure of rolling of the corrosion-resistant railway bolt of the present embodiment and railway spike steel；
The railroad spike material object of the corrosion-resistant railway bolt of the present embodiment and railway spike steel making is shown in Fig. 3；
The railroad spike of the corrosion-resistant railway bolt of the present embodiment and railway spike steel making is outer after 120 hours salt spray tests
It sees pattern and sees Fig. 4；
Railway spike is shown in Fig. 5 using position view.
(the corrosion-resistant railway bolt of embodiment 2-7 and railway spike steel roll state surface layer metallographic structure figure, roll state center portion metallographic group
It is similar to implementing 1 to knit figure, the railroad spike pictorial diagram of manufacture, exterior appearance figure of the railroad spike after 120 hours salt spray tests,
Therefore omit).
Embodiment 2
The chemical component of the corrosion-resistant railway bolt of the present embodiment and railway spike steel composition and mass percentage are shown in Table 1.
The manufacturing method of the corrosion-resistant railway bolt of the present embodiment and railway spike steel includes converter smelting, LF refining, VD vacuum
Processing, continuous casting, slow cooling, heating and rolling, flaw detection process, specific process step are as described below:
(1) converter smelting, converter terminal C:0.04% converter smelting process: are carried out after molten iron pretreatment；
(2) LF refining process: LF finishing slag FeO:0.3%, FeO+MnO:0.35%, C:0.8%, N:200PPm in steel；
(3) VD is vacuum-treated process: VD vacuum degree 68Pa, vacuum time 17min；
(4) M-EMS, electromagnetic agitation electric current 300A, electromagnetic agitation continuous casting working procedure: are used in continuous casting process
Frequency 10Hz；
(5) slow cooling operation: it is put into burial pit rapidly after slab cutting and carries out slow cooling, enters to cheat 673 DEG C of temperature, cheats temperature out
132℃；
(6) heating and rolling process: 1250 DEG C of slab heating temperature；920 DEG C of tandem rolling start rolling temperature, 950 DEG C of finishing temperature；
(7) flaw detection process process: stocking flaw detection is detected a flaw using ET+UT, ET flaw detection 0.5 × 20mm of precision, UT flaw detection precision
For 0.5 × 12.7mm of Φ.
The corrosion-resistant railway bolt of the present embodiment and railway spike are shown in Table 2 with steel mechanical property testing result.
Embodiment 3
The chemical component of the corrosion-resistant railway bolt of the present embodiment and railway spike steel composition and mass percentage are shown in Table 1.
The manufacturing method of the corrosion-resistant railway bolt of the present embodiment and railway spike steel includes converter smelting, LF refining, VD vacuum
Processing, continuous casting, slow cooling, heating and rolling, flaw detection process, specific process step are as described below:
(1) converter smelting, converter terminal C:0.045% converter smelting process: are carried out after molten iron pretreatment；
(2) LF refining process: LF finishing slag FeO:0.35%, FeO+MnO:0.45%, C:0.5%, N:150PPm in steel；
(3) VD is vacuum-treated process: VD vacuum degree 67Pa, vacuum time 10min；
(4) M-EMS, electromagnetic agitation electric current 300A, electromagnetic agitation continuous casting working procedure: are used in continuous casting process
Frequency 10Hz；
(5) slow cooling operation: it is put into burial pit rapidly after slab cutting and carries out slow cooling, enters to cheat 600 DEG C of temperature, cheats temperature out
185℃；
(6) heating and rolling process: 1150 DEG C of slab heating temperature；960 DEG C of tandem rolling start rolling temperature, 993 DEG C of finishing temperature；
(7) flaw detection process process: stocking flaw detection is detected a flaw using ET+UT, ET flaw detection 0.5 × 20mm of precision, UT flaw detection precision
For 0.5 × 12.7mm of Φ.
The corrosion-resistant railway bolt of the present embodiment and railway spike are shown in Table 2 with steel mechanical property testing result.
Embodiment 4
The chemical component of the corrosion-resistant railway bolt of the present embodiment and railway spike steel composition and mass percentage are shown in Table 1.
The manufacturing method of the corrosion-resistant railway bolt of the present embodiment and railway spike steel includes converter smelting, LF refining, VD vacuum
Processing, continuous casting, slow cooling, heating and rolling, flaw detection process, specific process step are as described below:
(1) converter smelting, converter terminal C:0.035% converter smelting process: are carried out after molten iron pretreatment；
(2) LF refining process: LF finishing slag FeO:0.3%, FeO+MnO:0.35%, C:0.65%, N:120PPm in steel；
(3) VD is vacuum-treated process: VD vacuum degree 200Pa, vacuum time 20min；
(4) M-EMS, electromagnetic agitation electric current 280A, electromagnetic agitation continuous casting working procedure: are used in continuous casting process
Frequency 6Hz；
(5) slow cooling operation: it is put into burial pit rapidly after slab cutting and carries out slow cooling, enters to cheat 657 DEG C of temperature, cheats temperature out
135℃；
(6) heating and rolling process: 1200 DEG C of slab heating temperature；960 DEG C of tandem rolling start rolling temperature, finishing temperature 1001
℃；
(7) flaw detection process process: stocking flaw detection is detected a flaw using ET+UT, ET flaw detection 0.5 × 20mm of precision, UT flaw detection precision
For 0.5 × 12.7mm of Φ.
The corrosion-resistant railway bolt of the present embodiment and railway spike are shown in Table 2 with steel mechanical property testing result.
Embodiment 5
The chemical component of the corrosion-resistant railway bolt of the present embodiment and railway spike steel composition and mass percentage are shown in Table 1.
The manufacturing method of the corrosion-resistant railway bolt of the present embodiment and railway spike steel includes converter smelting, LF refining, VD vacuum
Processing, continuous casting, slow cooling, heating and rolling, flaw detection process, specific process step are as described below:
(1) converter smelting, converter terminal C:0.03% converter smelting process: are carried out after molten iron pretreatment；
(2) LF refining process: LF finishing slag FeO:0.25%, FeO+MnO:0.3%, C:0.6%, N:140PPm in steel；
(3) VD is vacuum-treated process: VD vacuum degree 67Pa, vacuum time 15min；
(4) M-EMS, electromagnetic agitation electric current 240A, electromagnetic agitation continuous casting working procedure: are used in continuous casting process
Frequency 5Hz；
(5) slow cooling operation: it is put into burial pit rapidly after slab cutting and carries out slow cooling, enters to cheat 657 DEG C of temperature, cheats temperature out
132℃；
(6) heating and rolling process: 1160 DEG C of slab heating temperature；955 DEG C of tandem rolling start rolling temperature, 985 DEG C of finishing temperature；
(7) flaw detection process process: stocking flaw detection is detected a flaw using ET+UT, ET flaw detection 0.5 × 20mm of precision, UT flaw detection precision
For 0.5 × 12.7mm of Φ.
The corrosion-resistant railway bolt of the present embodiment and railway spike are shown in Table 2 with steel mechanical property testing result.
Embodiment 6
The chemical component of the corrosion-resistant railway bolt of the present embodiment and railway spike steel composition and mass percentage are shown in Table 1.
The manufacturing method of the corrosion-resistant railway bolt of the present embodiment and railway spike steel includes converter smelting, LF refining, VD vacuum
Processing, continuous casting, slow cooling, heating and rolling, flaw detection process, specific process step are as described below:
(1) converter smelting, converter terminal C:0.04% converter smelting process: are carried out after molten iron pretreatment；
(2) LF refining process: LF finishing slag FeO:0.4%, FeO+MnO:0.45%, C:0.9%, N:170PPm in steel；
(3) VD is vacuum-treated process: VD vacuum degree 150Pa, vacuum time 20min；
(4) M-EMS, electromagnetic agitation electric current 200A, electromagnetic agitation continuous casting working procedure: are used in continuous casting process
Frequency 4Hz；
(5) slow cooling operation: it is put into burial pit rapidly after slab cutting and carries out slow cooling, enters to cheat 608 DEG C of temperature, cheats temperature out
200℃；
(6) heating and rolling process: 1190 DEG C of slab heating temperature；1000 DEG C of tandem rolling start rolling temperature, finishing temperature 1050
℃；
(7) flaw detection process process: stocking flaw detection is detected a flaw using ET+UT, ET flaw detection 0.5 × 20mm of precision, UT flaw detection precision
For 0.5 × 12.7mm of Φ.
The corrosion-resistant railway bolt of the present embodiment and railway spike are shown in Table 2 with steel mechanical property testing result.
Embodiment 7
The chemical component of the corrosion-resistant railway bolt of the present embodiment and railway spike steel composition and mass percentage are shown in Table 1.
The manufacturing method of the corrosion-resistant railway bolt of the present embodiment and railway spike steel includes converter smelting, LF refining, VD vacuum
Processing, continuous casting, slow cooling, heating and rolling, flaw detection process, specific process step are as described below:
(1) converter smelting, converter terminal C:0.05% converter smelting process: are carried out after molten iron pretreatment；
(2) LF refining process: LF finishing slag FeO:0.4%, FeO+MnO:0.5%, C:1%, N:180PPm in steel；
(3) VD is vacuum-treated process: VD vacuum degree 67Pa, vacuum time 10min；
(4) M-EMS, electromagnetic agitation electric current 300A, electromagnetic agitation continuous casting working procedure: are used in continuous casting process
Frequency 3Hz；
(5) slow cooling operation: it is put into burial pit rapidly after slab cutting and carries out slow cooling, enters to cheat 657 DEG C of temperature, cheats temperature out
164℃；
(6) heating and rolling process: 1210 DEG C of slab heating temperature；982 DEG C of tandem rolling start rolling temperature, finishing temperature 1009
℃；
(7) flaw detection process process: stocking flaw detection is detected a flaw using ET+UT, ET flaw detection 0.5 × 20mm of precision, UT flaw detection precision
For 0.5 × 12.7mm of Φ.
The corrosion-resistant railway bolt of the present embodiment and railway spike are shown in Table 2 with steel mechanical property testing result.
Embodiment 8
The chemical component of the corrosion-resistant railway bolt of the present embodiment and railway spike steel composition and mass percentage are shown in Table 1.
The manufacturing method of the corrosion-resistant railway bolt of the present embodiment and railway spike steel includes converter smelting, LF refining, VD vacuum
Processing, continuous casting, slow cooling, heating and rolling, flaw detection process, specific process step are as described below:
(1) converter smelting, converter terminal C:0.25% converter smelting process: are carried out after molten iron pretreatment；
(2) LF refining process: LF finishing slag FeO:0.2%, FeO+MnO:0.3%, C:0.55%, N:175PPm in steel；
(3) VD is vacuum-treated process: VD vacuum degree 68Pa, vacuum time 10min；
(4) M-EMS, electromagnetic agitation electric current 150A, electromagnetic agitation continuous casting working procedure: are used in continuous casting process
Frequency 10Hz；
(5) slow cooling operation: it is put into burial pit rapidly after slab cutting and carries out slow cooling, enters to cheat 657 DEG C of temperature, cheats temperature out
132℃；
(6) heating and rolling process: 1230 DEG C of slab heating temperature；993 DEG C of tandem rolling start rolling temperature, finishing temperature 1021
℃；
(7) flaw detection process process: stocking flaw detection is detected a flaw using ET+UT, ET flaw detection 0.5 × 20mm of precision, UT flaw detection precision
For 0.5 × 12.7mm of Φ.
The corrosion-resistant railway bolt of the present embodiment and railway spike are shown in Table 2 with steel mechanical property testing result.
Comparative example 1
The chemical component of the corrosion-resistant railway bolt of the present embodiment and railway spike steel composition and mass percentage are shown in Table 1.
The manufacturing method of the corrosion-resistant railway bolt of the present embodiment and railway spike steel includes converter smelting, LF refining, VD vacuum
Processing, continuous casting, slow cooling, heating and rolling, flaw detection process, specific process step are as described below:
(1) converter smelting, converter terminal C:0.05% converter smelting process: are carried out after molten iron pretreatment；
(2) LF refining process: LF finishing slag FeO:0.4%, FeO+MnO:0.5%, C:1%, N:100PPm in steel；
(3) VD is vacuum-treated process: VD vacuum degree 130Pa, vacuum time 25min；
(4) M-EMS, electromagnetic agitation electric current 220A, electromagnetic agitation continuous casting working procedure: are used in continuous casting process
Frequency 4Hz；
(5) slow cooling operation: it is put into burial pit rapidly after slab cutting and carries out slow cooling, enters to cheat 632 DEG C of temperature, cheats temperature out
110℃；
(6) heating and rolling process: 1100 DEG C of slab heating temperature；988 DEG C of tandem rolling start rolling temperature, finishing temperature 1027
℃；
(7) flaw detection process process: stocking flaw detection is detected a flaw using ET+UT, ET flaw detection 0.5 × 20mm of precision, UT flaw detection precision
For 0.5 × 12.7mm of Φ.
The corrosion-resistant railway bolt of this comparative example and railway spike are shown in Table 2 with steel mechanical property testing result；Salt spray test examines knot
It is similar with comparative example 1 that fruit is shown in Table 2 salt spray test inspection result of 3(comparative example, therefore omits).
Comparative example 2
The chemical component of the corrosion-resistant railway bolt of the present embodiment and railway spike steel composition and mass percentage are shown in Table 1.
The manufacturing method of the corrosion-resistant railway bolt of the present embodiment and railway spike steel includes converter smelting, LF refining, VD vacuum
Processing, continuous casting, slow cooling, heating and rolling, flaw detection process, specific process step are as described below:
(1) converter smelting, converter terminal C:0.03% converter smelting process: are carried out after molten iron pretreatment；
(2) LF refining process: LF finishing slag FeO:0.2%, FeO+MnO:0.35%, C:0.5%, N:200PPm in steel；
(3) VD is vacuum-treated process: VD vacuum degree 125Pa, vacuum time 28min；
(4) M-EMS, electromagnetic agitation electric current 180A, electromagnetic agitation continuous casting working procedure: are used in continuous casting process
Frequency 6Hz；
(5) slow cooling operation: it is put into burial pit rapidly after slab cutting and carries out slow cooling, enters to cheat 668 DEG C of temperature, cheats temperature out
141℃；
(6) heating and rolling process: 1250 DEG C of slab heating temperature；979 DEG C of tandem rolling start rolling temperature, finishing temperature 1019
℃；
(7) flaw detection process process: stocking flaw detection is detected a flaw using ET+UT, ET flaw detection 0.5 × 20mm of precision,
UT detects a flaw precision as 0.5 × 12.7mm of Φ.
The steel chemical composition (wt%) of 1 embodiment 1-8 of table and comparative example 1-2
The mechanics properties testing result of table 2 embodiment 1-8 and comparative example 1-2
From Table 2, it can be seen that material of the present invention rolls state tension, yield behavior common material phase corresponding with comparative example
When, but elongation after fracture and low-temperature flexibility are significantly improved.
The salt spray test inspection result of table 3 embodiment 1 and comparative example 1
From table 3 it can be seen that material of the present invention is after neutral salt spray test 120 hours, material weight-loss ratio has compared with comparative example
It is apparent to reduce, opposite common material rate of corrosion≤50%, so as to think that its corrosion resistance is significantly improved.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (4)
1. a kind of corrosion-resistant railway bolt and railway spike steel, which is characterized in that the railway bolt and railway spike steel chemical composition
Composition and mass percentage are as follows: C:0.05~0.10%, Si:0.10~0.15%, Mn:0.10~0.50%, P:0.030~
0.045%, S≤0.010%, Cr:0.15~1.00%, Ni:0.10~0.45%, Cu:0.15~0.35%, V:0.04~0.10%,
Mo:0.10~0.40%, N:0.010~0.015%, Al >=0.020%, surplus are Fe and inevitable impurity；The railway spiral shell
Bolt and railway spike steel tensile strength >=450MPa, yield strength >=305MPa, elongation after fracture >=30%, room temperature KV2>=200J, 0
℃KV2>=130J, -40 DEG C of KV2>=34J, relatively corrosive rate≤50% of material after salt spray test；The delivery state of the steel is hot rolling
State.
2. based on a kind of manufacturing method of corrosion-resistant railway bolt and railway spike steel described in claim 1, which is characterized in that institute
The method of stating includes converter smelting, LF refining, VD vacuum processing, continuous casting, slow cooling, heating and rolling, flaw detection process；The continuous casting work
Sequence uses M-EMS；The converter smelting process carries out converter smelting after molten iron pretreatment, controls converter terminal C
≤0.05%；The LF refining process controls LF finishing slag FeO content≤0.4%, FeO+MnO≤0.5%, C≤1%, controls N in steel:
100~200ppm；The VD is vacuum-treated process, controls VD vacuum degree≤200Pa, 10~20min of vacuum time；The slow cooling
Process is put into rapidly burial pit after slab cutting and carries out slow cooling, enter and cheat temperature >=600 DEG C, cheats temperature≤200 DEG C out；It is described to add
Heat and rolling process, 1100~1250 DEG C of heating temperature；920~1000 DEG C of start rolling temperature of control, finishing temperature 950~1050
℃。
3. the manufacturing method of a kind of corrosion-resistant railway bolt and railway spike steel according to claim 2, which is characterized in that institute
Continuous casting working procedure is stated, M-EMS, electromagnetic agitation 150~300A of electric current, electromagnetic agitation frequency 3 are used in continuous casting process
~10Hz.
4. a kind of manufacturing method of corrosion-resistant railway bolt and railway spike steel according to claim 2-3 any one,
Be characterized in that, the flaw detection process is detected a flaw using ET+UT, ET detect a flaw 0.5 × 20mm of precision, UT detect a flaw precision be Φ 0.5 ×
12.7mm。
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| CN109487643A (en) * | 2018-09-14 | 2019-03-19 | 宁波博睿思特种材料科技有限公司 | Railway low-cost corrosion-resistant screw spike and its preparation process |
| CN112680653A (en) * | 2020-11-18 | 2021-04-20 | 联峰钢铁（张家港）有限公司 | High-strength steel for wagon bolt and manufacturing method thereof |
| CN116550942B (en) * | 2023-07-07 | 2023-10-20 | 江苏永钢集团有限公司 | Manufacturing method and application of corrosion-resistant low-temperature-resistant steel continuous casting blank for wind power |
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| CN101597713A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of microalloying SWRH87B gren rod and manufacture method thereof |
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| CN102227512A (en) * | 2009-11-17 | 2011-10-26 | 新日本制铁株式会社 | Steel wire for low temperature annealing and manufacturing method thereof |
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| JP5717479B2 (en) * | 2011-03-14 | 2015-05-13 | 新日鐵住金ステンレス株式会社 | High-strength, high-corrosion-resistant stainless steel bolts excellent in stress-corrosion-resistant cracks and methods for producing the same |
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| CN101597713A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of microalloying SWRH87B gren rod and manufacture method thereof |
| CN102227512A (en) * | 2009-11-17 | 2011-10-26 | 新日本制铁株式会社 | Steel wire for low temperature annealing and manufacturing method thereof |
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