CN112126855A - Production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa - Google Patents
Production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa Download PDFInfo
- Publication number
- CN112126855A CN112126855A CN202010950167.XA CN202010950167A CN112126855A CN 112126855 A CN112126855 A CN 112126855A CN 202010950167 A CN202010950167 A CN 202010950167A CN 112126855 A CN112126855 A CN 112126855A
- Authority
- CN
- China
- Prior art keywords
- cold
- rolling
- rolled
- 310mpa
- equal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 35
- 239000010959 steel Substances 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000002253 acid Substances 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 10
- 238000005098 hot rolling Methods 0.000 claims abstract description 10
- 238000005097 cold rolling Methods 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 229910000870 Weathering steel Inorganic materials 0.000 claims description 27
- 238000003466 welding Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 4
- 238000005554 pickling Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000002436 steel type Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 239000000839 emulsion Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 230000002441 reversible effect Effects 0.000 claims description 2
- 239000008237 rinsing water Substances 0.000 claims description 2
- 238000007127 saponification reaction Methods 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 238000005275 alloying Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 abstract description 4
- 238000009628 steelmaking Methods 0.000 abstract description 4
- 229910001567 cementite Inorganic materials 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 abstract description 2
- 229910001562 pearlite Inorganic materials 0.000 abstract description 2
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 2
- 238000004886 process control Methods 0.000 abstract 1
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/06—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
- C22C38/18—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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to a production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa, which is characterized in that a cold-rolled weather-resistant steel strip product with the thickness of 0.5-2.5 mm is obtained through reasonable chemical composition design, steelmaking smelting, hot rolling process, acid rolling process and continuous annealing process control, and the internal tissues of the cold-rolled weather-resistant steel product are ferrite, pearlite and cementite; the mechanical property result of the finished cold-rolled weather-resistant steel product is that the yield strength is more than or equal to 310MPa, the tensile strength is more than or equal to 450MPa, the elongation after fracture is more than or equal to 28 percent, the mechanical property is stable, the forming and atmospheric corrosion resistance of the steel strip product are excellent, and the steel strip product can be applied to the relevant fields of air preheaters, plate heat exchangers and the like. The cold-rolled weather-resistant steel product provided by the invention has the advantages that the addition amount of alloy elements such as Mn, Cu, Cr, Ni and the like is small, and the performance is optimized through controlling the steelmaking, hot rolling and cold rolling processes, so that the production cost of the product is reduced.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a production method of cold-rolled weather-resistant steel with yield strength of more than 310 MPa.
Background
The main cause of the damage of the steel products is corrosion, and the method for solving the corrosion problem generally increases the corrosion allowance or coats antirust paint. The former causes material waste, and the latter causes maintenance cost increase and sometimes affects normal use because maintenance recoating is required periodically. In another method, a metal coating is used for protection, mainly hot dip coating or zinc or aluminum spraying is adopted, but the application of the metal coating has the problems of higher cost, environmental pollution, difficult application of large-sized components, difficult welding and the like.
The weathering resistant steel is also called atmospheric corrosion resistant steel, and a certain amount of alloy elements such as Cu, P, Cr, Ni and the like are added into common steel products, so that the atmospheric corrosion resistance of the steel is improved. The weather resistance of the weathering steel is 2-8 times of that of common carbon steel, so that the material has the characteristics of corrosion resistance, long service life, thinning, consumption reduction, labor saving, energy saving and the like, and can be coated, used naked or subjected to stabilization treatment. In areas without serious atmospheric pollution or extra humidity, the weathering steel can be directly exposed in the atmosphere without coating, and generally after the annual time, a rust layer is gradually stable, corrosion does not develop any more, so that the problems of paint aging and the like do not exist, coating maintenance is not needed, the maintenance cost is greatly reduced, and the loss caused by the influence of painting on use and the like is avoided.
The development of the weathering steel in China starts late, the development starts in the beginning of the last 60 th generation, but with the development of national economy, the development requirements of various infrastructures and the environmental protection requirements, the demand of the weathering steel is increasing day by day, and the weathering steel products in China are mainly used in the fields of railway vehicles, containers, bridges, towers and the like. According to incomplete statistics, the annual consumption of the current domestic weathering steel products exceeds 400 million tons. With the stricter requirements of the market on the surface quality, the dimensional precision, the thickness specification and the like of the weathering steel products, the application fields of the cold-rolled weathering steel products with thin specifications are more and more, and the greater development requirements exist.
Disclosure of Invention
The invention aims to provide a production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa, a steel strip product is excellent in machine shaping and atmospheric corrosion resistance, and the method can be applied to the relevant fields of air preheaters, plate heat exchangers and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows: a production method of cold-rolled weathering steel with yield strength of more than 310MPa comprises the following main chemical components in percentage by mass: c: 0.060% to 0.090%, Si: 0.25-0.45%, Mn: 0.20% -0.40%, P: 0.070% -0.090%, S: less than or equal to 0.020%, Als: 0.015% -0.050%, Ni: 0.10-0.25%, Cr: 0.30% -0.45%, Cu: 0.20 to 0.35 percent of Fe and the balance of inevitable impurities and residual elements; the production method specifically comprises the following steps: 1) KR desulfurization; 2) smelting in a converter; 3) LF refining; 4) continuous casting; 5) hot rolling; 6) acid washing and cold rolling; 7) continuous annealing; 8) and (6) flattening and dividing the rolls.
Further, the chemical components of the cold-rolled weathering steel can be added with one or more of the following trace alloy elements: nb: 0.015% -0.030%, V: 0.02% -0.08%, Ti: 0.02% -0.06%, Mo: less than or equal to 0.30 percent, Zr: less than or equal to 0.15 percent.
Further, KR desulfurization in the step 1) requires that S is less than or equal to 0.025 percent after KR is finished; the slag skimming rate requires that the bright surface is more than or equal to 80 percent.
Further, the end point temperature of the converter smelting converter in the step 2) is 1640-1690 ℃; adopting a sliding plate to block slag; the outlet temperature is 1570-1610 ℃.
Further, calcium treatment is carried out after LF refining LF treatment in the step 3) is finished; the soft blowing time is more than or equal to 10 min.
Further, the continuous casting in the step 4) is performed at a casting speed of not less than 0.9m/min and at a constant casting speed; peeling the head blank and the tail blank; a continuous cast slab having a thickness of 230mm was obtained, and the slab quality was examined.
Further, the hot rolling in the step 5) is a 1+5+7 three-stage rolling process, and specifically, the rough rolling R1 rolling mill is 1-pass rolling; the rough rolling R2 rolling mill is reversible rolling in 5 passes in a reciprocating way; the finishing mill group is 7-frame continuous rolling; the heating temperature of the plate blank is 1240-1280 ℃; the finish rolling temperature is 860-900 ℃; the coiling temperature is 600-640 ℃; laminar cooling adopts a front-section cooling process and a U-shaped coiling mode, and the lengths of a hot head and a hot tail are increased by 50m respectively at 40 ℃; and (3) welding the hot-rolled steel coil after uncoiling by using a laser welding machine, and performing butt welding on the front coil and the rear coil of the weather-resistant steel of the same steel type.
Further, the temperature of acid liquor in the acid washing and cold rolling in the step 6) is 70-90 ℃; the acid liquor concentration of the final pickling tank is more than or equal to 140 g/L; the conductivity of the final rinsing water is less than or equal to 30 us/cm; adopting a five-stand rolling mill to carry out cold continuous rolling; the saponification value of the emulsion is more than or equal to 160 mgKOH/g; the total rolling reduction rate of the cold rolling is 55-75%, and the rolling reduction rate model of each machine frame automatically calculates.
Further, the continuously annealed and acid-rolled steel coil in the step 7) is uncoiled and then welded by a narrow lap welder, and a mode of butt welding the head and the tail of front and rear coils of the same type of weather-resistant steel is adopted; the soaking temperature of the annealing furnace is 760 ℃ to 780 ℃; the overaging outlet temperature is 345-375 ℃.
Further, the flattening elongation of the flattening and coil splitting in the step 8) is 0.5% -0.9%.
The invention has the following beneficial effects: the method comprises the steps of controlling through reasonable chemical composition design, steelmaking smelting, hot rolling process, acid rolling process and continuous annealing process to obtain a cold-rolled weather-resistant steel strip product with the thickness of 0.5-2.5 mm, wherein the internal structure of the cold-rolled weather-resistant steel product is ferrite, pearlite and cementite, and the grain size grade is 9-11 grade; the mechanical property result of the finished cold-rolled weather-resistant steel product is that the yield strength is more than or equal to 310MPa, the tensile strength is more than or equal to 450MPa, the elongation after fracture is more than or equal to 28 percent, the mechanical property is stable, the forming and atmospheric corrosion resistance of the steel strip product are excellent, and the steel strip product can be applied to the relevant fields of air preheaters, plate heat exchangers and the like. The cold-rolled weather-resistant steel product provided by the invention has the advantages that the addition amount of alloy elements such as Mn, Cu, Cr, Ni and the like is small, and the performance is optimized through controlling the steelmaking, hot rolling and cold rolling processes, so that the production cost of the product is reduced.
Drawings
FIG. 1 is a metallographic structure diagram of a finished cold-rolled weathering steel product in example 1.
FIG. 2 is a metallographic structure diagram of a finished cold-rolled weathering steel product in example 2.
FIG. 3 is a metallographic structure diagram of a finished cold-rolled weathering steel product in example 3.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.
In each example, KR desulfurization, converter smelting and LF refining are carried out to obtain a furnace of molten steel with required chemical components, the molten steel is continuously cast to produce a plate blank, the thickness of the plate blank is 230mm, and the specific components of each example are shown in Table 1.
TABLE 1 Main chemical composition Table of molten steel in examples 1 to 3
In each example, the continuously cast slab is sent to a hot rolling heating furnace for heating, after the slab is taken out of the furnace, the slab is rolled for 1+5+ 7' passes through a rough rolling double-stand R1+ R2 rolling mill and a finish rolling seven-stand continuous rolling unit, the pass reduction rate is automatically calculated by a model, and finally the slab enters a coiler through laminar flow front-section cooling to produce a hot rolled coil, wherein specific hot rolling temperature parameters of each example are shown in Table 2.
TABLE 2 Hot Rolling temperature parameters in examples 1-3
| Temperature parameter/. degree.C | Temperature of heating | Temperature of finish rolling | Coiling temperature |
| The invention | 1240～1280 | 860～900 | 600～640 |
| Example 1 | 1270 | 878 | 630 |
| Example 2 | 1265 | 886 | 615 |
| Example 3 | 1268 | 880 | 623 |
In each embodiment, the hot rolled coil is naturally cooled, uncoiled again and passes through a laser welding machine of an acid rolling production line, the head and the tail of the front coil and the tail of the rear coil are welded and connected and then enter a pickling tank, continuous cold rolling is carried out on the front coil and the rear coil in a five-rack six-roller cold continuous rolling machine after pickling, the reduction rate of each rack is automatically calculated by a model, cold and hard coils are produced, and the specific acid rolling process parameters of each embodiment are shown in table.
TABLE 3 parameters of the acid rolling process in examples 1-3
In each example, the cold hard coil is uncoiled again and passes through a narrow lap welder of a continuous annealing production line, the head and the tail of the front coil and the tail of the rear coil are welded and connected, then cleaning, annealing, flattening and coiling are carried out, and finally a cold rolled finished coil is produced, wherein the specific continuous annealing process parameters of each example are shown in table 4.
TABLE 4 continuous annealing Process parameters in examples 1-3
| Process parameters | Soaking temperature/. degree.C | Overaging temperature/. degree C | Percent flat elongation/%) |
| The invention | 760～780 | 345～375 | 0.5～0.9 |
| Example 1 | 770 | 363 | 0.5 |
| Example 2 | 768 | 361 | 0.8 |
| Example 3 | 775 | 358 | 0.7 |
The final mechanical properties of the cold-rolled weathering steel products obtained in the examples are shown in Table 5. The metallographic structures of the finished cold-rolled weathering steel products of examples 1 to 3 are shown in fig. 1 to 3, respectively.
TABLE 5 Performance of the finished steel strip in examples 1-3
| Class of performance | Yield strength/MPa | Tensile strength/MPa | Elongation/percent |
| The invention | ≥310 | ≥450 | ≥28 |
| Example 1 | 369 | 494 | 34.0 |
| Example 2 | 384 | 500 | 31.5 |
| Example 3 | 354 | 474 | 33.5 |
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (10)
1. The production method of the cold-rolled weathering steel with yield strength of more than 310MPa is characterized in that the cold-rolled weathering steel comprises the following main chemical components in percentage by mass: c: 0.060% to 0.090%, Si: 0.25-0.45%, Mn: 0.20% -0.40%, P: 0.070% -0.090%, S: less than or equal to 0.020%, Als: 0.015% -0.050%, Ni: 0.10-0.25%, Cr: 0.30% -0.45%, Cu: 0.20 to 0.35 percent of Fe and the balance of inevitable impurities and residual elements;
the production method specifically comprises the following steps:
1) KR desulfurization; 2) smelting in a converter; 3) LF refining; 4) continuous casting; 5) hot rolling; 6) acid washing and cold rolling; 7) continuous annealing; 8) and (6) flattening and dividing the rolls.
2. The method for producing the cold-rolled weathering steel with yield strength of more than 310MPa according to claim 1, characterized in that the chemical composition of the cold-rolled weathering steel can also be added with one or more of the following minor alloying elements: nb: 0.015% -0.030%, V: 0.02% -0.08%, Ti: 0.02% -0.06%, Mo: less than or equal to 0.30 percent, Zr: less than or equal to 0.15 percent.
3. The method for producing cold-rolled weathering steel with yield strength of 310MPa or more according to claim 1, wherein S is less than or equal to 0.025% after KR desulfurization is completed in the step 1); the slag skimming rate requires that the bright surface is more than or equal to 80 percent.
4. The method for producing the cold-rolled weathering steel with yield strength of more than 310MPa according to claim 1, characterized in that the end temperature of the converter smelting converter in the step 2) is 1640-1690 ℃; adopting a sliding plate to block slag; the outlet temperature is 1570-1610 ℃.
5. The method for producing cold-rolled weather-resistant steel with yield strength of more than 310MPa according to claim 1, wherein calcium treatment is performed after LF refining LF treatment in the step 3); the soft blowing time is more than or equal to 10 min.
6. The method for producing the cold-rolled weathering steel with yield strength of more than 310MPa according to claim 1, characterized in that the continuous casting drawing speed of the step 4) is more than or equal to 0.9m/min, and casting is carried out at constant drawing speed; peeling the head blank and the tail blank; a continuous cast slab having a thickness of 230mm was obtained, and the slab quality was examined.
7. The method for producing cold-rolled weathering steel with yield strength of 310MPa or more according to claim 1, wherein the hot rolling of step 5) is a "1 +5+ 7" three-stage rolling process, specifically a rough rolling R1 rolling mill is a 1-pass rolling; the rough rolling R2 rolling mill is reversible rolling in 5 passes in a reciprocating way; the finishing mill group is 7-frame continuous rolling; the heating temperature of the plate blank is 1240-1280 ℃; the finish rolling temperature is 860-900 ℃; the coiling temperature is 600-640 ℃; laminar cooling adopts a front-section cooling process and a U-shaped coiling mode, and the lengths of a hot head and a hot tail are increased by 50m respectively at 40 ℃; and (3) welding the hot-rolled steel coil after uncoiling by using a laser welding machine, and performing butt welding on the front coil and the rear coil of the weather-resistant steel of the same steel type.
8. The method for producing cold-rolled weathering steel with yield strength of 310MPa or more according to claim 1, wherein the acid liquor temperature in the acid washing and cold-rolling of step 6) is 70 ℃ to 90 ℃; the acid liquor concentration of the final pickling tank is more than or equal to 140 g/L; the conductivity of the final rinsing water is less than or equal to 30 us/cm; adopting a five-stand rolling mill to carry out cold continuous rolling; the saponification value of the emulsion is more than or equal to 160 mgKOH/g; the total rolling reduction rate of the cold rolling is 55-75%, and the rolling reduction rate model of each machine frame automatically calculates.
9. The method for producing the cold-rolled weathering steel with yield strength of more than 310MPa according to claim 1, characterized in that the continuously annealed and acid-rolled steel coil in step 7) is uncoiled and then welded by a narrow lap welder in a way that the weathering steel is butt-welded with the front and back coils of the same steel type; the soaking temperature of the annealing furnace is 760 ℃ to 780 ℃; the overaging outlet temperature is 345-375 ℃.
10. The method for producing cold-rolled weathering steel with yield strength of 310MPa or more according to claim 1, wherein the flattening elongation of the flattening coil splitting in step 8) is 0.5% to 0.9%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010950167.XA CN112126855A (en) | 2020-09-11 | 2020-09-11 | Production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010950167.XA CN112126855A (en) | 2020-09-11 | 2020-09-11 | Production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112126855A true CN112126855A (en) | 2020-12-25 |
Family
ID=73846554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010950167.XA Pending CN112126855A (en) | 2020-09-11 | 2020-09-11 | Production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112126855A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113637905A (en) * | 2021-07-28 | 2021-11-12 | 武汉钢铁有限公司 | Low-cost weathering steel for 310MPa cold-rolled automobile and preparation method thereof |
| CN114032467A (en) * | 2021-11-17 | 2022-02-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled high-strength steel plate and preparation method thereof |
| CN115572904A (en) * | 2022-10-18 | 2023-01-06 | 山东钢铁集团日照有限公司 | Manufacturing method of high-weather-resistance cold-rolled steel strip with yield strength of 340MPa |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106893950A (en) * | 2017-01-13 | 2017-06-27 | 唐山钢铁集团有限责任公司 | Low yield strength ratio cold rolling weather resisting steel and its production method |
| CN110318006A (en) * | 2019-07-31 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of cold rolling weather resisting steel and preparation method thereof |
| CN110317936A (en) * | 2019-07-31 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of motor train compartment shell cold rolling weather resisting steel and preparation method thereof |
| CN111519082A (en) * | 2020-04-30 | 2020-08-11 | 张家港扬子江冷轧板有限公司 | Preparation method of ultrathin cold-rolled weather-resistant steel plate |
-
2020
- 2020-09-11 CN CN202010950167.XA patent/CN112126855A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106893950A (en) * | 2017-01-13 | 2017-06-27 | 唐山钢铁集团有限责任公司 | Low yield strength ratio cold rolling weather resisting steel and its production method |
| CN110318006A (en) * | 2019-07-31 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of cold rolling weather resisting steel and preparation method thereof |
| CN110317936A (en) * | 2019-07-31 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of motor train compartment shell cold rolling weather resisting steel and preparation method thereof |
| CN111519082A (en) * | 2020-04-30 | 2020-08-11 | 张家港扬子江冷轧板有限公司 | Preparation method of ultrathin cold-rolled weather-resistant steel plate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113637905A (en) * | 2021-07-28 | 2021-11-12 | 武汉钢铁有限公司 | Low-cost weathering steel for 310MPa cold-rolled automobile and preparation method thereof |
| CN114032467A (en) * | 2021-11-17 | 2022-02-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled high-strength steel plate and preparation method thereof |
| CN115572904A (en) * | 2022-10-18 | 2023-01-06 | 山东钢铁集团日照有限公司 | Manufacturing method of high-weather-resistance cold-rolled steel strip with yield strength of 340MPa |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2506321C2 (en) | General-purpose line for treatment of steel strip for production of high-strength steel of various types | |
| CN112725704B (en) | Hot-galvanized 420 MPa-grade low-alloy high-strength steel for automobiles and production method thereof | |
| CN103320683B (en) | Process for producing hot-rolled acid-pickled 610 L automobile frame steel strip with thin gauge and high elongation | |
| CN103194695B (en) | Steel with stable oxide layer for pretreatment-free high-strength container and manufacture method of steel | |
| CN100392131C (en) | Hot-rolled steel sheet for processing and manufacturing method thereof | |
| CN100500914C (en) | Method for rolling thick specification low-alloy structure steel plate by using middle and thin plate blank | |
| CN109504930B (en) | Hot-dip galvanized steel sheet with tensile strength of more than 1300MPa and production method thereof | |
| CN103249847B (en) | Method for manufacturing high-strength cold-rolled/hot-rolled trip steel having a tensile strength of 590 mpa grade, superior workability, and low mechanical-property deviation | |
| CN103114257B (en) | Acid-washing-free high-strength crossbeam steel with stable oxide layer and preparation method of steel | |
| CN109055867B (en) | Method for producing high-hole-expansion hot-dip galvanized plate with tensile strength of 540MPa | |
| CN112126855A (en) | Production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa | |
| CN107881429A (en) | A kind of hot rolling high-strength weathering steel and its manufacture method | |
| CN110499447A (en) | Steel for electroplating fastening belt buckle and manufacturing method thereof | |
| CN110499479A (en) | Steel with excellent electroplating performance for high-strength bolting belt and manufacturing method thereof | |
| CN110055458A (en) | Production method of hot-rolled pickled automobile plate | |
| CN113061810A (en) | Production method of 590 MPa-grade enhanced formability hot-dip galvanized dual-phase steel | |
| CN115011873A (en) | Hot-galvanized high-strength structural steel with yield strength of 550MPa and production method thereof | |
| CN114875339A (en) | Low-density cold-rolled thin steel strip with short process, low energy consumption and high tensile strength and manufacturing method thereof | |
| CN113846272A (en) | Hot rolling preparation method of 1700MPa grade high Cr-Si thin-specification hot forming steel | |
| CN115572904A (en) | Manufacturing method of high-weather-resistance cold-rolled steel strip with yield strength of 340MPa | |
| CN107587052A (en) | Cold-rolled high-strength steel for automobile structural part and manufacturing method thereof | |
| CN114959478B (en) | Multi-purpose 800MPa grade complex phase steel and regulation and control method thereof | |
| WO2023093111A1 (en) | High cr-si alloyed coating-free hot forming steel and hot rolling preparation method therefor | |
| CN104593698B (en) | Method for manufacturing high-strength cold-rolled weather resisting steel plates and high-strength cold-rolled weather resisting steel plates | |
| CN113215486B (en) | A kind of hot-dip galvanized high-hole expansion dual-phase steel and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201225 |