CN105543690A - Submarine seamless line pipe above 415SPDF steel grade having large strain resistance - Google Patents
Submarine seamless line pipe above 415SPDF steel grade having large strain resistance Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 4
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 8
- 229910052745 lead Inorganic materials 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 229910052787 antimony Inorganic materials 0.000 claims description 5
- 229910052785 arsenic Inorganic materials 0.000 claims description 5
- 229910052797 bismuth Inorganic materials 0.000 claims description 5
- 229910052718 tin Inorganic materials 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910000990 Ni alloy Inorganic materials 0.000 abstract description 2
- 229910000599 Cr alloy Inorganic materials 0.000 abstract 1
- 229910001182 Mo alloy Inorganic materials 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
- 239000011575 calcium Substances 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 8
- 229910052791 calcium Inorganic materials 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 208000037656 Respiratory Sounds Diseases 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- C22C38/02—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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a submarine seamless line pipe above 415SPDF steel grade having large strain resistance. The submarine seamless line pipe comprises the following components, by weight, 0.05-0.11% of C, 0.20-0.40% of Si, 1.0-1.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.002% of S, 0.05-0.30% of Ni, 0.05-0.30% of Cr, 0.05-0.30% of Mo, 0.010-0.050% of Als, less than or equal to 0.010% of N, 0.010-0.050% of Nb, 0.03-0.08% of V, 0.05-0.25% of Cu, 0.008-0.030% of Ti, less than or equal to 0.020%of Pb, less than or equal to 0.020% of Sn, less than or equal to 0.030% of As, less than or equal to 0.015% of Sb, less than or equal to 0.015% of Bi, less than or equal to 0.0005% of B, less than or equal to 0.22% of carbon equivalent CEpcm, less than or equal to 0.39% of CEIIW, and less than or equal to 0.8% of a total amount of Ni, Mo, Cr and Cu that are added to Ni, Mo, Cr and Cu alloys. The submarine seamless line pipe has the benefits that after three times of pull-down circulation under 3% strain, the strength of the submarine seamless line pipe can be ensured to be greater than 415MPa, and ballistic work at minus 20 degrees of the submarine seamless line pipe can be ensured to be greater than 300J; the submarine seamless line pipe has less than or equal to 1.5% of crack sensitivity ratio (CSR), less than or equal to 5% of crack length ratio, and less than or equal to 3% of crack thickness ratio (CTR); and the submarine seamless line pipe does not break under 100% loading for 96h by an SSCB method.
Description
Technical field
The present invention relates to based on stress design corrosion resistant material and seamless tube field, particularly there is more than the 415SPDF grade of steel submarine seamless line pipe of Chinese People's Anti-Japanese Military and Political College's strain.
Background technology
Day by day severe along with offshore oil Natural gas extraction condition, the drilling degree of depth increases year by year, and the exploitation at deep-sea gets more and more, and shallow sea mining type can not satisfy the demands completely.The pipe laying mode in shallow sea can not meet the demand of ocean petroleum developing simultaneously.Along with the change of field conditions, laid by traditional S-lay and change R-lay paving mode gradually into.The line pipe of R-lay paving mode, except conventional tensile property, impact property and hardness requirement, also requires to have good Chinese People's Anti-Japanese Military and Political College's strain property, ruptures tough fragility energy, corrosion resistance and good geometrical dimension.Line pipe required for R-lay paving mode is material the highest in line pipe material rate, product requirement has ultralow impurity element, the inclusion of good form and ultralow the amount of inclusions, well homogeneous microstructure, high strength soft and excellent corrosion resistance.High strength (>=415MPa) Chinese People's Anti-Japanese Military and Political College's strain property also has no report by the 3% tension and compression submarine seamless line pipe tested for 3 times that circulates.
Summary of the invention
For solving Problems existing in above-mentioned technology, the object of this invention is to provide a kind of more than 415SPDF grade of steel submarine seamless line pipe with Chinese People's Anti-Japanese Military and Political College's strain property, to meet the line pipe of the Chinese People's Anti-Japanese Military and Political College's strain property required for the severe rugged environment exploitations such as deep-sea, solve line pipe when Reusability, intensity sharply declines and can not meet design requirement.
For realizing goal of the invention, the technical solution used in the present invention is to provide a kind of more than 415SPDF grade of steel submarine seamless line pipe with Chinese People's Anti-Japanese Military and Political College's strain, it is characterized in that: % by weight of this submarine seamless line pipe composition is C0.05 ~ 0.11%, Si0.20 ~ 0.40%, Mn1.0 ~ 1.40%, P≤0.010%, S≤0.002%, Ni0.05 ~ 0.30%, Cr0.05 ~ 0.30%, Mo0.05 ~ 0.30%, Als0.010 ~ 0.050%, N≤0.010%, Nb0.010 ~ 0.050%, V0.03 ~ 0.08%, Cu0.05 ~ 0.25%, Ti0.008 ~ 0.030%, Pb≤0.020%, Sn≤0.020%, As≤0.030%, Sb≤0.015%, Bi≤0.015%, B≤0.0005%, surplus is Fe and impurity, carbon equivalent ce pcm≤0.22%, CE II W≤0.39%, add Ni, Mo, Cr, Cu alloy, and limit Ni+Mo+Cr+Cu≤0.8%, Pb+Sn+As+Sb+Bi≤0.030%.
The Chinese People's Anti-Japanese Military and Political College strain property of described submarine seamless line pipe under yield strength >=415MPa: under 3% strain, tension and compression 3 the energy proof strengths that circulate are greater than 415MPa, and-20 DEG C of ballistic works are greater than 300J; Also have good hic resistance and SSC performance index are: crack-sensitivity rate (CSR)≤1.5%, crack length rate≤5%, crack thickness rate (CTR)≤3%, SSCB method 100% SMYS loads lower 96h and does not rupture.
Effect of the present invention adopts this submarine seamless line pipe tension and compression 3 energy proof strengths that circulate under 3% strain to be greater than 415MPa,-20 DEG C of ballistic works are greater than 300J, obvious intensity is not had sharply to reduce, also there is good hic resistance and SSC performance, crack-sensitivity rate, crack length rate and crack thickness rate are 0, meet crack-sensitivity rate (CSR)≤1.5% completely, crack length rate≤5%,, there is not fracture and cracking after 720 hours in the corrosive nature requirement of crack thickness rate (CTR)≤3% simultaneously.Line pipe of the present invention has been applied to region, the European North Sea, and result of use is good, meets site operation requirement, has good welding property, corrosion resistance and Chinese People's Anti-Japanese Military and Political College's strain property.
Accompanying drawing explanation
Fig. 1 is line pipe embodiment series impact merit graphic representation of the present invention;
Fig. 2 is the metallographic structure B of line pipe embodiment of the present invention
return+ S
return+ F500 ×;
Fig. 3 is the metallographic structure B of line pipe embodiment of the present invention
return+ F500 ×;
Fig. 4 is the tension and compression cycle diagram of line pipe embodiment of the present invention.
Embodiment
By reference to the accompanying drawings more than the 415SPDF grade of steel submarine seamless line pipe with Chinese People's Anti-Japanese Military and Political College's strain property of the present invention is illustrated.
More than the 415SPDF grade of steel submarine seamless line pipe design philosophy with Chinese People's Anti-Japanese Military and Political College's strain property of the present invention is based on oil and gas development industrial trend, gradually exploiting ocean and deep-sea must the performance requriements with Chinese People's Anti-Japanese Military and Political College's strain tube spool based on, carry out Composition Design and performance optimization, meet form of construction work R-lay to the high resistance large sstrain performance of tubing requirement, high impact toughness and improved corrosion performance.
More than the 415SPDF grade of steel submarine seamless line pipe with Chinese People's Anti-Japanese Military and Political College's strain of the present invention, % by weight of this submarine seamless line pipe composition is C0.05 ~ 0.11%, Si0.20 ~ 0.40%, Mn1.0 ~ 1.40%, P≤0.010%, S≤0.002%, Ni0.05 ~ 0.30%, Cr0.05 ~ 0.30%, Mo0.05 ~ 0.30%, Als0.010 ~ 0.050%, N≤0.010%, Nb0.010 ~ 0.050%, V0.03 ~ 0.08%, Cu0.05 ~ 0.25%, Ti0.008 ~ 0.030%, Pb≤0.020%, Sn≤0.020%, As≤0.030%, Sb≤0.015%, Bi≤0.015%, B≤0.0005%, surplus is Fe and impurity, carbon equivalent ce pcm≤0.22%, CE II W≤0.39%, add Ni, Mo, Cr, Cu alloy, and limit Ni+Mo+Cr+Cu≤0.8%, Pb+Sn+As+Sb+Bi≤0.030.
The Chinese People's Anti-Japanese Military and Political College strain property of described submarine seamless line pipe under yield strength >=415MPa: under 3% strain, tension and compression 3 the energy proof strengths that circulate are greater than 415MPa, and-20 DEG C of ballistic works are greater than 300J; Also have good hic resistance and SSC performance index are: crack-sensitivity rate (CSR)≤1.5%, crack length rate≤5%, crack thickness rate (CTR)≤3%, SSCB method 100% SMYS loads lower 96h and does not rupture.
The chemical composition that more than the 415SPDF grade of steel submarine seamless line pipe with Chinese People's Anti-Japanese Military and Political College's strain of the present invention is specifically optimized is described as follows:
C: intensity element, considers that welding property is so place restrictions on its content in 0.05 ~ 0.13% scope.
Si: intensity element, considers toughness and solidity to corrosion, so placed restrictions in 0.20 ~ 0.40% scope by its content.
Mn: intensity element, considers low-temperature flexibility and Properties of HIC resistance, so placed restrictions in 1.0 ~ 1.40% scopes by its content.
P, S:P and S are impurity elements.Reduce its content in steelmaking process, impurity content controls at P≤0.010%, S≤0.002% as far as possible.
Als:Al is deoxidant element, and Als more can reflect real aluminium content, its content lower than 0.005% time can not reach deoxidation effect, but during too high levels, easily cause oxide inclusion, so placed restrictions in Als0.010 ~ 0.050% scope by its content.
Nb: micro alloying element, crystal grain thinning, improves corrosion resistance.Control its content in 0.010 ~ 0.050% scope.
V: microalloy element, precipitation strength improves the intensity of steel.Control V content is in 0.05 ~ 0.09% scope.
Ti: microalloy element, crystal grain thinning, improves intensity and surface quality.Control its content 0.008 ~ 0.030%.Micro-Ti process is the surface quality ensureing steel pipe by adding the thermoplasticity improving steel pipe on a small quantity.
Cr: alloy element, improves intensity and ensures soft, control its scope content in 0.05 ~ 0.30% scope.
Mo: alloy element, improves intensity and corrosion resistance, controls its content in 0.05 ~ 0.30% scope.
Ni: alloy element, improves intensity, erosion resistance and low-temperature flexibility, controls its content in 0.05 ~ 0.30% scope.
Cu: alloy element, improves Properties of HIC resistance, controls its content in 0.05 ~ 0.25% scope.
Ca: calcium is very easily oxidized, general recovery rate is low especially, and Calcium treatment is difficult to the content ensureing to meet required for spheroidizing, therefore carries out secondary Calcium treatment, ensures that calcium contents is 0.0005 ~ 0.0040%.Secondary Calcium treatment, after VD or RH, carries out before upper continuous casting, ensures the recovery rate of Ca, can meet CaS nodularization requirement, again can crystal grain thinning, improves corrosion resistance.
O, N, H: elemental gas, consider corrosive nature, surface quality etc., control lower aq as far as possible.N≤0.010％，O≤0.002％，H≤0.0002％。
Pb, Sn, As, Sb, Bi: five-harmful elements, the inevitable impurity of steel grade.But its too high levels can cause steel tube surface to crack, also unfavorable to corrosion resistance, control its content at Pb≤0.020%, Sn≤0.020%, As≤0.030%, Sb≤0.015%, Bi≤0.015%.Pb+Sn+As+Sb+Bi≤0.030％。
B: residual element.Consider surface quality and the welding property of steel, control its content in≤0.0005% scope.
According to % by weight batching of seamless line pipe composition of the present invention, by steel-making, seamless oblique milling, modifier treatment, high-quality steel scrap, tube head and molten iron (>=30%) is adopted to be raw material, silk process is fed by EAF electric furnace, LF refining, VD or RH vacuum oven, FW, feed silk and be treated to pure Ca silk, feed quantity >=50m/ stove, secondary Calcium treatment, Trace Titanium Treatment, continuous casting cast steel billet; Control straightening temperature and be greater than 950 DEG C, adopt end induction stirring; Adopt secondary Calcium treatment to reduce Impurity S con-tent, Trace Titanium Treatment improves blank hot plasticity and ensures cc billet surface quality, and end induction stirring reduces component segregation; After the cold centering of continuously cast bloom, by cold centering, perforation, three rod PQF Continuous mill train tandem rollings, sizing, the large cold bed cooling of walking beam, adopt two roller MPM or three rod PQF Continuous mill train tandem rollings can obtain the specification series of 60.3mm ~ 508mm, 508 ~ 711mm specification series can be produced in conjunction with 720REM unit; Roll after cooling state pipe after the heating of stepped start-stop system high-temperature heater in spray outer pouring Rotary Water cold quenching, stepped start-stop system low-temperature heat stove tempering air cooling, hot straightening, hot size obtain the qualified Chinese People's Anti-Japanese Military and Political College of final size and strain anticorrosive seamless line pipe, its performance can reach following requirement:
1. tensile property: yield strength: >=415MPa, tensile strength: >=530MPa
Yield tensile ratio :≤0.90;
2.V type notch shock performance:
Test temperature-20 DEG C, laterally, full-scale Charpy-V impact power >=300J, shear area 100%; Have fabulous low-temperature flexibility, even if at-80 DEG C, ballistic work also can at more than 150J, as shown in Figure 1;
3. hardness test :≤230HV10;
4. grain fineness number: 9 grades ~ 14 grades;
5. metallographic structure: duplex structure B
return+ F or complex tissue B
return+ S
return+ F (adding the tubing of Cr, Mo, Ni alloy all more than more than 0.1%), as shown in Figures 2 and 3;
6. Properties of HIC resistance:
Under NACEA solution, soak 96 hours test samples, be and occur crackle, meet crack length rate≤5%, crack thickness rate≤3, the high-level corrosion resistance requirement of crack-sensitivity rate≤1.5%, there is excellent Properties of HIC resistance.
7. anti-SSC performance
Specimen size 115mmx15mmx5mm, under NACEA solution, loads 100% SMYS (415MPa), test period >=96h.After off-test, sample does not have any as seen more than cracking or the crackle of 0.1mm.
8. Chinese People's Anti-Japanese Military and Political College's strain property
First sample is moved to after plasticity 3% is out of shape, then push back former length, so circulation three times, as shown in Figure 4.Specimen length guarantees the length met after deformation required for follow-up test.Sample after gross distortion, 250 DEG C of timeliness, carries out proportional test bar tension test, hardness test, impact of collision test after being incubated 1 hour.Test-results requires below will meeting:
A. tensile property: yield strength: >=415MPa, tensile strength: >=530MPa
Yield tensile ratio :≤0.90;
B.V type notch shock performance: ballistic work: test temperature-20 DEG C, laterally, full-scale Charpy-V impact power >=300J, shear area 100%;
C. hardness test :≤230HV10;
Within d.HIC and SSC:96 hour, there is not crackle and cracking.
According to seamless line pipe composition batching of the present invention, by steel-making, seamless oblique milling, modifier treatment, high-quality steel scrap, tube head and molten iron (>=30%) is adopted to be raw material, silk process is fed by EAF electric furnace, LF refining, VD or RH vacuum oven, FW, feed silk and be treated to pure Ca silk, feed quantity >=50m/ stove, secondary Calcium treatment, Trace Titanium Treatment, continuous casting cast steel billet; Control straightening temperature and be greater than 950 DEG C, adopt end induction stirring; After the cold centering of continuously cast bloom, by cold centering, perforation, MPM Continuous mill train tandem rolling, sizing, the large cold bed cooling of walking beam; Roll state pipe cold quenching, stepped start-stop system low-temperature heat stove tempering air cooling, hot straightening, hot size after the heating of stepped start-stop system high-temperature heater after cooling and obtain seamless line pipe, with 415SPDF grade of steel, specification 219.1mm × 15.9mm is example, and its chemical composition is as following table 1; Mechanical property is as following table 2; Properties of HIC resistance is in table 3; Anti-SSC performance is as table 4; Chinese People's Anti-Japanese Military and Political College's strain property is as table 5.
Because tubing chemical composition configures according to above-mentioned requirement completely, S and P content is lower, each stove component content deviation is very little, carries out temperature control when stable component content is conducive to thermal treatment, thus provides precondition for tubing has good structure and properties.
As can be seen from Table 2, the seamless line pipe that the present invention obtains has high strength, soft (≤230HV10), high impact toughness, because very low hardness value is then given security for very high corrosion resistance.From hic resistance test-results table 3, there is very strong Properties of HIC resistance, all do not find hydrogen induced cracking (HIC) crackle and hydrogen blistering, crack-sensitivity rate (CSR)≤0%, crack length rate≤0%, crack thickness rate (CTR)≤0%.Can find out at high loads from table 4, seamless line pipe product of the present invention still has good anti-SSC performance, does not occur cracking and crackle.Table 5 still can meet intensity be greater than 415MPa in the tension and compression performance after 3 times that circulates, and describes seamless line pipe of the present invention and has good Chinese People's Anti-Japanese Military and Political College's strain property.
The embodiment chemical composition of table 1 line pipe of the present invention
Note: Ni+Mo+Cr+Cu≤0.8%; Pb+Sn+As+Sb+Bi≤0.030%
The mechanical property of table 2 line pipe embodiment of the present invention and metallographic
The hic resistance test-results of table 3 line pipe embodiment of the present invention
The hic resistance test-results of table 4 line pipe embodiment of the present invention
Mechanical property after 3% tension and compression circulation of table 5 line pipe embodiment of the present invention
Claims (2)
1. one kind has more than the 415SPDF grade of steel submarine seamless line pipe of Chinese People's Anti-Japanese Military and Political College's strain, it is characterized in that: % by weight of this submarine seamless line pipe composition is C0.05 ~ 0.11%, Si0.20 ~ 0.40%, Mn1.0 ~ 1.40%, P≤0.010%, S≤0.002%, Ni0.05 ~ 0.30%, Cr0.05 ~ 0.30%, Mo0.05 ~ 0.30%, Als0.010 ~ 0.050%, N≤0.010%, Nb0.010 ~ 0.050%, V0.03 ~ 0.08%, Cu0.05 ~ 0.25%, Ti0.008 ~ 0.030%, Pb≤0.020%, Sn≤0.020%, As≤0.030%, Sb≤0.015%, Bi≤0.015%, B≤0.0005%, surplus is Fe and impurity, carbon equivalent ce pcm≤0.22%, CE II W≤0.39%, add Ni, Mo, Cr, Cu alloy, and limit Ni+Mo+Cr+Cu≤0.8%, Pb+Sn+As+Sb+Bi≤0.030%.
2. submarine seamless line pipe according to claim 1, it is characterized in that: the Chinese People's Anti-Japanese Military and Political College strain property of described submarine seamless line pipe under yield strength >=415MPa: under 3% strain, tension and compression 3 the energy proof strengths that circulate are greater than 415MPa, and-20 DEG C of ballistic works are greater than 300J; Also have good hic resistance and SSC performance index are: crack-sensitivity rate (CSR)≤1.5%, crack length rate≤5%, crack thickness rate (CTR)≤3%, SSCB method 100% SMYS loads lower 96h and does not rupture.
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| CN201610033953.7A CN105543690A (en) | 2016-01-19 | 2016-01-19 | Submarine seamless line pipe above 415SPDF steel grade having large strain resistance |
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| CN201610033953.7A CN105543690A (en) | 2016-01-19 | 2016-01-19 | Submarine seamless line pipe above 415SPDF steel grade having large strain resistance |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019112705A (en) * | 2017-12-26 | 2019-07-11 | 日本製鉄株式会社 | Seamless steel tube and manufacturing method of seamless steel tube |
| CN111094608A (en) * | 2017-09-19 | 2020-05-01 | 日本制铁株式会社 | Steel pipe and steel plate |
| US20210054473A1 (en) * | 2018-03-19 | 2021-02-25 | Tata Steel Limited | Steel composition in accordance with api 5l psl-2 specification for x-65 grade having enhanced hydrogen induced cracking (hic) resistance, and method of manufacturing the steel thereof |
| CN113637890A (en) * | 2020-04-27 | 2021-11-12 | 宝山钢铁股份有限公司 | Ultra-fine grain seamless steel pipe and manufacturing method thereof |
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| CN111094608A (en) * | 2017-09-19 | 2020-05-01 | 日本制铁株式会社 | Steel pipe and steel plate |
| CN111094608B (en) * | 2017-09-19 | 2021-10-26 | 日本制铁株式会社 | Steel pipe and steel plate |
| JP2019112705A (en) * | 2017-12-26 | 2019-07-11 | 日本製鉄株式会社 | Seamless steel tube and manufacturing method of seamless steel tube |
| US20210054473A1 (en) * | 2018-03-19 | 2021-02-25 | Tata Steel Limited | Steel composition in accordance with api 5l psl-2 specification for x-65 grade having enhanced hydrogen induced cracking (hic) resistance, and method of manufacturing the steel thereof |
| CN113637890A (en) * | 2020-04-27 | 2021-11-12 | 宝山钢铁股份有限公司 | Ultra-fine grain seamless steel pipe and manufacturing method thereof |
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Application publication date: 20160504 |