AU2020442274B2 - 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel and manufacturing method therefor - Google Patents
690 MPa-graded easy-to-weld corrosion-resisting high-strength steel and manufacturing method therefor Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 181
- 239000010959 steel Substances 0.000 title claims abstract description 181
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 239000000956 alloy Substances 0.000 claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims description 93
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 54
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 37
- 229910052742 iron Inorganic materials 0.000 claims description 27
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 22
- 238000007664 blowing Methods 0.000 claims description 22
- 238000005266 casting Methods 0.000 claims description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 22
- 238000009749 continuous casting Methods 0.000 claims description 19
- 238000009847 ladle furnace Methods 0.000 claims description 19
- 229910052804 chromium Inorganic materials 0.000 claims description 18
- 229910052802 copper Inorganic materials 0.000 claims description 18
- 229910052759 nickel Inorganic materials 0.000 claims description 18
- 229910052748 manganese Inorganic materials 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 17
- 229910052698 phosphorus Inorganic materials 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 17
- 229910052717 sulfur Inorganic materials 0.000 claims description 17
- 229910052720 vanadium Inorganic materials 0.000 claims description 17
- 238000005275 alloying Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 16
- 238000007689 inspection Methods 0.000 claims description 16
- 238000007670 refining Methods 0.000 claims description 16
- 238000005480 shot peening Methods 0.000 claims description 16
- 238000009628 steelmaking Methods 0.000 claims description 16
- 238000005496 tempering Methods 0.000 claims description 16
- 229910052750 molybdenum Inorganic materials 0.000 claims description 14
- 238000009849 vacuum degassing Methods 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 11
- 229910052791 calcium Inorganic materials 0.000 claims description 11
- 239000011575 calcium Substances 0.000 claims description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- 239000001257 hydrogen Substances 0.000 claims description 11
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 11
- 230000001590 oxidative effect Effects 0.000 claims description 11
- 229910052758 niobium Inorganic materials 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 5
- 238000005065 mining Methods 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000003466 welding Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- 239000011651 chromium Substances 0.000 description 11
- 239000010949 copper Substances 0.000 description 11
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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- 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
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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Abstract
690 MPa-graded easy-to-weld corrosion-resisting high-strength steel and a manufacturing method therefor. Components (wt%) of the steel are as follows: C: 0.13%-0.23%; Si: 0.10%-0.60%; Mn: 0.80%-1.90%: P: <0.018%; S: <0.008%; Cr: 0-0.50%; Ni: 0-0.60%; Mo: 0-0.45%; Cu: 0-0.40%; Nb: 0-0.060%; V: 0-0.15%; Ti: 0-0.120%; B: 0-0.0035%; and Al: 0.010%-0.050%. An even and fine troostitic structure is obtained during heat treatment in alloy component design, good mechanical properties and fatigue properties are obtained, welding performance and corrosion resistance are more excellent, and the steel adapts to production and manufacturing in engineering machinery, mining machinery, harbor machinery and other industries.
Description
690 MPA-GRADED EASY-TO-WELD CORROSION-RESISTING HIGH-STRENGTH STEEL AND MANUFACTURING METHOD THEREFOR
[0001] The present disclosure relates to the technical field of steel smelting, and specifically relates to a 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel and a manufacturing method therefor.
[0002] Mine resources mining, engineering construction, and port operation are inseparable from mining machinery, engineering machinery, and port machinery. To improve the working efficiency of engineering machinery, coal mining machinery and port machinery, and reduce energy consumption and emissions, it is urgent to develop the light-weighting and weight-reducing mechanical structure. Replacing ordinary carbon and low-strength steel with high-strength steel has become the main way to save energy, reduce emission, and improve efficiency.
[0003] Currently, the low-grade steel such as 345 MPa steel is mostly used for the manufacture of the above-mentioned machinery, which has resulted in problems such as bulky machinery, materials and energy wasting, and low working efficiency. The use of rolling- and cooling-controlled steel with the same level also has the problem of large deformation of blank cutting, large internal stress of the steel plate and uneven stress.
[0004] In an attempt to solve the above-mentioned technical problems, the present disclosure provides a 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel that may be obtained through the method disclosed herein. The 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel is composed of the following chemical composition in mass percentage: C: 0.13%-0.23%, Si: 0.10%-0.60%, Mn: 0.80%-1.90%, P < 0.018%, S < 0.008%, Cr: 0-0.50%, Ni: 0-0.60%, Mo: 0-0.45%, Cu: 0-0.40%, Nb: 0-0.060%, V: 0-0.15%, Ti: -0.120%, B: 0-0.0035%, andAl: 0.010-0.050%.
[0005] The technical effects are as follows: the present disclosure develops a new alloy system design, and uses a heat treatment process to realize the low alloy content. The content of aluminum and nickel added is low, which saves a lot of alloy costs. The alloys design adopted is mainly to obtain a uniform and fine troostite structure for heat treatment. The 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel obtained has good mechanical properties, fatigue properties, better weldability, and corrosion resistance, which is suitable for the manufacture of the steel plate for engineering machinery, mining machinery, port machinery and other industries.
[0006] The 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel described above is composed of the following chemical composition in mass percentage: C: 0.13%-0.18%, Si: 0.10%-0.50%, Mn: 1.30%-1.70%, P < 0.018%, S < 0.008%, Cr: 0-0.50%, Ni: 0-0.40%, Mo: -0.45%, Cu: 0-0.40%, Nb: 0-0.060%, V: 0-0.15%, Ti: 0-0.120%, B: 0-0.0035%, and Al: 0.010-0.050%.
[0007] The 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel described above is composed of the following chemical composition in mass percentage: C: 0.13%-0.17%, Si: 0.10%-0.45%, Mn: 1.30%-1.70%, P < 0.018%, S < 0.005%, Cr: 0-0.50%, Ni: 0-0.45%, Mo: -0.35%, Cu: 0-0.40%, Nb: 0-0.060%, V: 0-0.080%, Ti: 0-0.120%, B: 0-0.0035%, andAl: 0.010 0.050%.
[0008] The 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel described above is composed of the following chemical composition in mass percentage: C: 0.13%-0.19%, Si: 0.10%-0.40%, Mn: 0.90%-1.65%, P < 0.016%, S < 0.003%, Cr: 0-0.40%, Ni: 0-0.40%, Mo: -0.35%, Cu: 0-0.35%, Nb: 0-0.050%, V: 0-0.080%, Ti: 0-0.120%, B: 0-0.0035%, and Al: 0.010-0.050%.
[0009] Paragraph [0009] intentionally deleted.
[0010] The present disclosure also attempts to provide a method for manufacturing the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel disclosed herein, comprising molten iron pretreatment -- converter steelmaking -- deoxidizing and alloying -- ladle furnace (LF) refining -> Ruhrstahl Heraeus (RH) vacuum degassing -- continuous casting via a continuous casting machine (CCM) -- billet heating -- two-stage rolling -- cooling- straightening -- shot peening -- heating -- quenching-- tempering -- straightening- sampling for inspection and identification -- obtaining a finished product; wherein,
[0011] the molten iron pretreatment is carried out so that a content of S in molten iron is less than 0.010%; the converter steelmaking is carried out via a basic oxygen furnace (BOF) process, then the deoxidizing and alloying are carried out; the LF refining is carried out for 15-30 min, and then fine-tuning of alloys is carried out so that a temperature of molten steel obtained reaches 1560-1600 °C; the RH vacuum degassing is carried out for 15-36 min via a bottom-argon-blowing process to stir and float up to remove non-metallic inclusions and reduce contents of nitrogen, hydrogen, and oxygen; calcium cored wire is fed to purify the molten steel so that the non-metallic inclusions is spheroidized; argon-blowing is carried out during a whole casting process for protection, the continuous casting is carried out with a casting speed of 0.75-1.2 m/min, and electromagnetic stirring is carried out; a billet obtained is heated evenly at 1100-1220 °C for 3.5-4.5 h; the two-stage rolling is carried out with a four-high reversing mill, a reduction rate for rolling is greater than 60%, an initial rolling temperature for rough rolling is 1070-1180 °C, and an initial rolling temperature and a final rolling temperature for finish rolling in a second stage are 890-950 °C and 800-880 °C, respectively; the cooling is controlled, a self-tempering temperature of a steel plate obtained is 600-690 °C; the steel plate is straightened via a nine-roll straightener so that an unevenness of the steel plate is 2-6 mm/m; the shot peening is carried out to remove iron oxide scales of the steel plate; the steel plate is heated in a non-oxidizing roller hearth furnace protected by nitrogen to 880-930 °C; the steel plate is quenched via a rolling waterjet; the steel plate is tempered in a roller hearth furnace at 530-620 °C; inspection and identification of the finished product are carried out, and then qualified products are stocked and delivered.
[0012] A thickness of the steel plate manufactured by the method for manufacturing the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel described above is 80 mm, and the steel plate is composed of the following chemical composition in mass percentage: C: 0.14%, Si: 0.27%, Mn: 1.53%, P: 0.011%, S: 0.003%, Cr: 0.35%, Ni: 0.18%, Mo: 0.22%, Cu: 0.17%, V: 0.035%, Ti: 0.019%, B: 0.0009%, andAl: 0.027%; wherein,
[0013] the molten iron pretreatment is carried out so that the content of S in the molten iron is 0.002%; the converter steelmaking is carried out via the BOF process, then the deoxidizing and alloying are carried out; the LF refining is carried out for 25 min, and then the fine-tuning of the alloys is carried out so that the temperature of the molten steel reaches 1590 °C; the RH vacuum degassing is carried out for 30 min via the bottom-argon-blowing process to stir and float up to remove the non-metallic inclusions and reduce the contents of nitrogen, hydrogen, and oxygen; the calcium cored wire is fed to purify the molten steel so that the non-metallic inclusions is spheroidized; argon-blowing is carried out during the whole casting process for protection, the continuous casting is carried out with the casting speed of 0.88 m/min, and the electromagnetic stirring is carried out; the billet obtained is heated evenly at 1190 °C for 4.3 h; the two-stage rolling is carried out with the four-high reversing mill, the reduction rate for the rolling is 62%, the initial rolling temperature for the rough rolling is 1150 °C, and the initial rolling temperature and the final rolling temperature for the finish rolling in the second stage are 890 °C and 800 °C, respectively; the cooling is controlled, the self-tempering temperature of the steel plate obtained is 650 °C; the steel plate is straightened via the nine-roll straightener so that the unevenness of the steel plate is 5 mm/m; the shot peening is carried out to remove the iron oxide scales of the steel plate; the steel plate is heated in the non-oxidizing roller hearth furnace protected by nitrogen to 910 °C; the steel plate is quenched via the rolling waterjet at 890 °C; the steel plate is tempered in the roller hearth furnace at 530 °C; the inspection and identification of the finished product are carried out, and then the qualified products are stocked and delivered.
[0014] The thickness of the steel plate manufactured by the method for manufacturing the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel described above is 40 mm, and the steel plate is composed of the following chemical composition in mass percentage: C: 0.14%, Si: 0.30%, Mn: 1.51%, P: 0.014%, S: 0.001%, Cr: 0.36%, Ni: 0.21%, Mo: 0.13%, Cu: 0.15%, V: 0.033%, Ti: 0.017%, B: 0.0014%, andAl: 0.033%; wherein,
[0015] the molten iron pretreatment is carried out so that the content of S in the molten iron is 0.001%; the converter steelmaking is carried out via the BOF process, then the deoxidizing and alloying are carried out; the LF refining is carried out for 24 min, and then the fine-tuning of the alloys is carried out so that the temperature of the molten steel reaches 1590 °C; the RH vacuum degassing is carried out for 30 min via the bottom-argon-blowing process to stir and float up to remove the non-metallic inclusions and reduce the contents of nitrogen, hydrogen, and oxygen; the calcium cored wire is fed to purify the molten steel so that the non-metallic inclusions is spheroidized; argon-blowing is carried out during the whole casting process for protection, the continuous casting is carried out with the casting speed of 0.88 m/min, and the electromagnetic stirring is carried out; the billet obtained is heated evenly at 1200 °C for 4.2 h; the two-stage rolling is carried out with the four-high reversing mill, the reduction rate for the rolling is 62%, the initial rolling temperature for the rough rolling is 1160 °C, and the initial rolling temperature and the final rolling temperature for the finish rolling in the second stage are 890 °C and 810 °C, respectively; the cooling is controlled, the self-tempering temperature of the steel plate obtained is 650 °C; the steel plate is straightened via the nine-roll straightener so that the unevenness of the steel plate is 5 mm/m; the shot peening is carried out to remove the iron oxide scales of the steel plate; the steel plate is heated in the non-oxidizing roller hearth furnace protected by nitrogen to 910 °C; the steel plate is quenched via the rolling waterjet at 890 °C; the steel plate is tempered in the roller hearth furnace at 535 °C; the inspection and identification of the finished product are carried out, and then the qualified products are stocked and delivered.
[0016] The thickness of the steel plate manufactured by the method for manufacturing the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel described above is 8 mm, and the steel plate is composed of the following chemical composition in mass percentage: C: 0.15%, Si: 0.23%, Mn: 1.49%, P: 0.013%, S: 0.002%, Cr: 0.37%, Ni: 0.18%, Cu: 0.11%, V: 0.030%, Ti:
0.018%, B: 0.0012%, andAl: 0.019%; wherein,
[0017] the molten iron pretreatment is carried out so that the content of S in the molten iron is 0.002%; the converter steelmaking is carried out via the BOF process, then the deoxidizing and alloying are carried out; the LF refining is carried out for 25 min, and then the fine-tuning of the alloys is carried out so that the temperature of the molten steel reaches 1590 °C; the RH vacuum degassing is carried out for 30 min via the bottom-argon-blowing process to stir and float up to remove the non-metallic inclusions and reduce the contents of nitrogen, hydrogen, and oxygen; the calcium cored wire is fed to purify the molten steel so that the non-metallic inclusions is spheroidized; argon-blowing is carried out during the whole casting process for protection, the continuous casting is carried out with the casting speed of 0.88 m/min, and the electromagnetic stirring is carried out; the billet obtained is heated evenly at 1180 °C for 4.4 h; the two-stage rolling is carried out with the four-high reversing mill, the reduction rate for the rolling is 63%, the initial rolling temperature for the rough rolling is 1140 °C, and the initial rolling temperature and the final rolling temperature for the finish rolling in the second stage are 940 °C and 850 °C, respectively; the cooling is controlled, the self-tempering temperature of the steel plate obtained is 620 °C; the steel plate is straightened via the nine-roll straightener so that the unevenness of the steel plate is 6 mm/m; the shot peening is carried out to remove the iron oxide scales of the steel plate; the steel plate is heated in the non-oxidizing roller hearth furnace protected by nitrogen to 910 °C; the steel plate is quenched via the rolling waterjet at 900 °C; the steel plate is tempered in the roller hearth furnace at 550 °C; the inspection and identification of the finished product are carried out, and then the qualified products are stocked and delivered.
[0018] The beneficial effects of the present disclosure are as follows:
[0019] (1) The microstructure of the steel manufactured by the present disclosure is tempered and fine troostite. Thus, the steel has higher toughness and better elongation properties, which is beneficial to resist the initiation and expansion of fatigue cracks.
[0020] (2) The steel of the present disclosure is more even, and has more uniform performance, small deformation of blank cutting, and low production cost.
[0021] (3) The steel of the present disclosure is mainly applied in engineering machinery, coal mining machinery and port machinery manufacturing industries, and replaces low-grade Q345B and Q460C steels due to its strength doubling. The corrosion resistance of the steel of the present disclosure is increased by 20% by adding a small amount of copper and chromium. Thus, more than 30% of steel is saved. The manufacture of the steel of the present disclosure promotes the upgrading of engineering machinery, coal mining machinery and port machinery, saves raw materials, prolongs the service life of products, improves the quality of main materials in the engineering machinery industry, and enhances the value of social resources.
[0022] Example 1
[0023] This example provides the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel, which is the S690QL (Q690E) steel plate with the thickness of 80 mm. The S690QL (Q690E) steel plate is composed of the following chemical composition in mass percentage: C: 0.14%, Si: 0.27%, Mn: 1.53%, P: 0.011%, S: 0.003%, Cr: 0.35%, Ni: 0.18%, Mo: 0.22%, Cu: 0.17%, V: 0.035%, Ti: 0.019%, B: 0.0009%, and Al: 0.027%.
[0024] The manufacturing method includes molten iron pretreatment -- converter steelmaking -- deoxidizing and alloying -- ladle furnace (LF) refining -> Ruhrstahl Heraeus (RH) vacuum degassing -- continuous casting via a continuous casting machine (CCM) -- billet heating - two-stage rolling -- cooling -- straightening -- shot peening -- heating -- quenching- tempering -- straightening -- sampling for inspection and identification -- obtaining a finished product. Specifically, the molten iron pretreatment is carried out so that the content of S in the molten iron is 0.002%. The converter steelmaking is carried out via the BOF process, and then the deoxidizing and alloying are carried out. The LF refining is carried out for 25 min, and then the fine-tuning of the alloys is carried out so that the temperature of the molten steel reaches 1590 °C. The RH vacuum degassing is carried out for 30 min via the bottom-argon-blowing process to stir and float up to remove the non-metallic inclusions and reduce the contents of nitrogen, hydrogen, and oxygen. The calcium cored wire is fed to purify the molten steel so that the non-metallic inclusions is spheroidized. Argon-blowing is carried out during the whole casting process for protection, the continuous casting is carried out with the casting speed of 0.88 m/min, and the electromagnetic stirring is carried out. The billet obtained is heated evenly at 1190 °C for 4.3 h. The two-stage rolling is carried out with the four-high reversing mill, the reduction rate for the rolling is 62%, the initial rolling temperature for the rough rolling is 1150 °C, and the initial rolling temperature and the final rolling temperature for the finish rolling in the second stage are 890 °C and 800 °C, respectively. The cooling is controlled, and the self-tempering temperature of the steel plate obtained is 650 °C. The steel plate is straightened via the nine-roll straightener so that the unevenness of the steel plate is 5 mm/m. The shot peening is carried out to remove the iron oxide scales of the steel plate. The steel plate is heated in the non-oxidizing roller hearth furnace protected by nitrogen to 910 °C. The steel plate is quenched via the rolling waterjet at 890 °C. The steel plate is tempered in the roller hearth furnace at 530 °C. The inspection and identification of the finished product are carried out, and then the qualified products are stocked and delivered.
[0025] The mechanical properties of the steel plate are as follows: the yield strength is 730 MPa, the tensile strength is 850 MPa, the percent elongation is 19%, the impact energy at -40 °C is 216 J, 223 J, and 209 J (10 x 10 mm, at the 1/4 thickness of the steel plate).
[0026] Example 2
[0027] This example provides the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel, which is the S690QL (Q690E) steel plate with the thickness of 40 mm. The S690QL (Q690E) steel plate is composed of the following chemical composition in mass percentage: C: 0.14%, Si: 0.30%, Mn: 1.51%, P: 0.014%, S: 0.001%, Cr: 0.36%, Ni: 0.21%, Mo: 0.13%, Cu: 0.15%, V: 0.033%, Ti: 0.017%, B: 0.0014%, and Al: 0.033%.
[0028] The manufacturing method includes molten iron pretreatment-- converter steelmaking -- deoxidizing and alloying -- LF refining -> RH vacuum degassing-- continuous casting via the CCM -- billet heating -- two-stage rolling -- cooling -- straightening -- shot peening - heating -- quenching-- tempering -- straightening -- sampling for inspection and identification -- obtaining a finished product. Specifically, the molten iron pretreatment is carried out so that the content of S in the molten iron is 0.001%. The converter steelmaking is carried out via the BOF process, and then the deoxidizing and alloying are carried out. The LF refining is carried out for 24 min, and then the fine-tuning of the alloys is carried out so that the temperature of the molten steel reaches 1590 °C. The RH vacuum degassing is carried out for 30 min via the bottom-argon-blowing process to stir and float up to remove the non-metallic inclusions and reduce the contents of nitrogen, hydrogen, and oxygen. The calcium cored wire is fed to purify the molten steel so that the non-metallic inclusions is spheroidized. Argon-blowing is carried out during the whole casting process for protection, the continuous casting is carried out with the casting speed of 0.88 m/min, and the electromagnetic stirring is carried out. The billet obtained is heated evenly at 1200 °C for 4.2 h. The two-stage rolling is carried out with the four-high reversing mill, the reduction rate for the rolling is 62%, the initial rolling temperature for the rough rolling is 1160 °C, and the initial rolling temperature and the final rolling temperature for the finish rolling in the second stage are 890 °C and 810 °C, respectively. The cooling is controlled, and the self-tempering temperature of the steel plate obtained is 650 °C. The steel plate is straightened via the nine-roll straightener so that the unevenness of the steel plate is 5 mm/m. The shot peening is carried out to remove the iron oxide scales of the steel plate. The steel plate is heated in the non-oxidizing roller hearth furnace protected by nitrogen to 910 °C. The steel plate is quenched via the rolling waterjet at 890 °C, and the steel plate is tempered in the roller hearth furnace at 535 °C. The inspection and identification of the finished product are carried out, and then the qualified products are stocked and delivered.
[0029] The mechanical properties of the steel plate are as follows: the yield strength is 725 MPa, the tensile strength is 838 MPa, the percent elongation is 18%, the impact energy at -40 °C is 231 J, 223 J, and 216 J (10 x 10 mm, at the 1/4 thickness of the steel plate).
[0030] Example 3
[0031] This example provides the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel, which is the S690QL (Q690E) steel plate with the thickness of 8 mm. The S690QL (Q690E) steel plate is composed of the following chemical composition in mass percentage: C: 0.15%, Si: 0.23%, Mn: 1.49%, P: 0.013%, S: 0.002%, Cr: 0.37%, Ni: 0.18%, Cu: 0.11%, V: 0.030%, Ti: 0.018%, B: 0.0012%, and Al: 0.019%.
[0032] The manufacturing method includes molten iron pretreatment-- converter steelmaking -- deoxidizing and alloying -- LF refining -> RH vacuum degassing-- continuous casting via the CCM -- billet heating -- two-stage rolling -- cooling -- straightening -- shot peening - heating -- quenching-- tempering -- straightening -- sampling for inspection and identification -- obtaining a finished product. Specifically, the molten iron pretreatment is carried out so that the content of S in the molten iron is 0.002%. The converter steelmaking is carried out via the BOF process, and then the deoxidizing and alloying are carried out. The LF refining is carried out for 25 min, and then the fine-tuning of the alloys is carried out so that the temperature of the molten steel reaches 1590 °C. The RH vacuum degassing is carried out for 30 min via the bottom-argon-blowing process to stir and float up to remove the non-metallic inclusions and reduce the contents of nitrogen, hydrogen, and oxygen. The calcium cored wire is fed to purify the molten steel so that the non-metallic inclusions is spheroidized. Argon-blowing is carried out during the whole casting process for protection, the continuous casting is carried out with the casting speed of 0.88 m/min, and the electromagnetic stirring is carried out. The billet obtained is heated evenly at 1180 °C for 4.4 h. The two-stage rolling is carried out with the four-high reversing mill, the reduction rate for the rolling is 63%, the initial rolling temperature for the rough rolling is 1140 °C, and the initial rolling temperature and the final rolling temperature for the finish rolling in the second stage are 940 °C and 850 °C, respectively. The cooling is controlled, and the self-tempering temperature of the steel plate obtained is 620 °C; the steel plate is straightened via the nine-roll straightener so that the unevenness of the steel plate is 6 mm/m. The shot peening is carried out to remove the iron oxide scales of the steel plate. The steel plate is heated in the non-oxidizing roller hearth furnace protected by nitrogen to 910 °C. The steel plate is quenched via the rolling waterjet at 900 °C, and the steel plate is tempered in the roller hearth furnace at 550 °C. The inspection and identification of the finished product are carried out, and then the qualified products are stocked and delivered.
[0033] The mechanical properties of the steel plate are as follows: the yield strength is 715 MPa, the tensile strength is 820 MPa, the percent elongation is 18%, the impact energy at -40 °C is 92 J, 92 J, and 96 J (5 x 10 mm).
[0034] According to statistics, the demand for the steel plate used in engineering machinery, coal mining machinery and port machinery in China is more than 16.5 million tons, of which the 690 MPa steel plate only accounts for about 10%. It is urgent to increase the proportion of the 690 MPa steel plate, and upgrade the technology. Therefore, the demand for easily-weldable corrosion-resistant and high-strength steel due to the development of engineering machinery is increasing year by year, and the market prospect is promising. The present disclosure aims to upgrade the 345 MPa and 460 MPa steel plates to the new corrosion-resistant steel plate with the yield strength more than 690 MPa. As a result, the performance of the current machinery is improved, the usage of steel is reduced by 30%, the welding material, logistics costs and energy consumption are saved, the economic efficiency and market competitiveness are improved. To sum up, the present disclosure reduces waste, saves overall social resources and energy, and promotes green development.
[0035] The steel plate manufactured by the present disclosure are mainly used as the new material for engineering machinery, mining machinery and port machinery. Specifically, the steel plate is used for the manufacture of the upper and lower frames, booms and arms of excavators, the roofs and side guards of hydraulic supports, the bearing frames of shore machines, and suspension bridges. The advanced process of pure steel smelting and heat treatment is adopted to control the size, quantity and type of inclusions and refine the structure. The new steel is capable of withstanding repeated alternating stress, resisting fatigue and corrosion, saving fuel consumption and materials, prolonging service life, and improving efficiency. The new steel replaces the Q345B and Q460C low-grade steels, promotes the upgrading of metallurgical products, engineering machinery, mining machinery and port machinery in China, improves the quality of low-end products applied widely, and has a very broad development prospect. According to the annual production and sales volume of 250,000 tons and the gross profit per ton of steel of 1,200 yuan, the annual gross profit is expected to exceed 300 million yuan, and the potential social benefits are immeasurable.
[0036] In addition to the above-mentioned examples, the present disclosure may also have other examples. All technical solutions formed by equivalent replacements or transformations shall fall within the protection scope of the present disclosure.
[0037] The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that such prior art forms part of the common general knowledge.
[0038] It will be understood that the terms "comprise" and "include" and any of their derivatives (e.g. comprises, comprising, includes, including) as used in this specification, and the claims that follow, is to be taken to be inclusive of features to which the term refers, and is not meant to exclude the presence of any additional features unless otherwise stated or implied.
[0039] In some cases, a single embodiment may, for succinctness and/or to assist in understanding the scope of the disclosure, combine multiple features. It is to be understood that in such a case, these multiple features may be provided separately (in separate embodiments), or in any other suitable combination. Alternatively, where separate features are described in separate embodiments, these separate features may be combined into a single embodiment unless otherwise stated or implied. This also applies to the claims which can be recombined in any combination. That is a claim may be amended to include a feature defined in any other claim. Further a phrase referring to "at least one of' a list of items refers to any combination of those items, including single members. As an example, "at least one of: a, b, or c" is intended to cover: a,b, c, a-b, a-c,b-c, and a-b-c.
Claims (8)
1. A method for manufacturing 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel, comprising molten iron pretreatment -- converter steelmaking - deoxidizing and alloying -- ladle furnace (LF) refining -> Ruhrstahl Heraeus (RH) vacuum degassing -- continuous casting via a continuous casting machine (CCM) -- billet heating - two-stage rolling -- cooling -- straightening -- shot peening -- heating -- quenching- tempering -- straightening -- sampling for inspection and identification -- obtaining a finished product; wherein, the molten iron pretreatment is carried out so that a content of S in molten iron is less than 0.010%; the converter steelmaking is carried out via a basic oxygen furnace (BOF) process, then the deoxidizing and alloying are carried out; the LF refining is carried out for 15-30 min, and then fine-tuning of alloys is carried out so that a temperature of molten steel obtained reaches 1560-1600 °C; the RH vacuum degassing is carried out for 15-36 min via a bottom-argon-blowing process to stir and float up to remove non-metallic inclusions and reduce contents of nitrogen, hydrogen, and oxygen; calcium cored wire is fed to purify the molten steel so that the non-metallic inclusions is spheroidized; argon-blowing is carried out during a whole casting process for protection, the continuous casting is carried out with a casting speed of 0.75-1.2 m/min, and electromagnetic stirring is carried out; a billet obtained is heated evenly at 1100-1220 °C for 3.5-4.5 h; the two-stage rolling is carried out with a four-high reversing mill, a reduction rate for rolling is greater than 60%, an initial rolling temperature for rough rolling is 1070-1180 °C, and an initial rolling temperature and a final rolling temperature for finish rolling in a second stage are 890-950 °C and 800-880 °C, respectively; the cooling is controlled, a self-tempering temperature of a steel plate obtained is 600-690 °C; the steel plate is straightened via a nine-roll straightener so that an unevenness of the steel plate is 2-6 mm/m; the shot peening is carried out to remove iron oxide scales of the steel plate; the steel plate is heated in a non-oxidizing roller hearth furnace protected by nitrogen to 880-930 °C; the steel plate is quenched via a rolling waterjet; the steel plate is tempered in a roller hearth furnace at 530-620 °C; inspection and identification of the finished product are carried out, and then qualified products are stocked and delivered, the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel is composed of the following chemical composition in mass percentage: C: 0.13%-0.23%, Si: 0.10%-0.60%, Mn: 0.80%-1.90%, P < 0.018%, S < 0.008%, Cr: 0-0.50%, Ni: 0-0.60%, Mo: 0-0.45%, Cu: 0-0.40%, Nb: 0-0.060%, V: 0-0.15%, Ti: 0-0.120%, B: 0-0.0035%, andAl: 0.010-0.050%.
2. The method for manufacturing the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel according to claim 1, wherein the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel is composed of the following chemical composition in mass percentage: C: 0.13%-0.18%, Si: 0.10%-0.50%, Mn: 1.30%-1.70%, P < 0.018%, S < 0.008%, Cr: 0-0.50%, Ni: 0-0.40%, Mo: 0-0.45%, Cu: 0-0.40%, Nb: 0-0.060%, V: 0-0.15%, Ti: -0.120%, B: 0-0.0035%, andAl: 0.010-0.050%.
3. The method for manufacturing the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel according to claim 1, wherein the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel is composed of the following chemical composition in mass percentage: C: 0.13%-0.17%, Si: 0.10%-0.45%, Mn: 1.30%-1.70%, P < 0.018%, S < 0.005%, Cr: 0-0.50%, Ni: 0-0.45%, Mo: 0-0.35%, Cu: 0-0.40%, Nb: 0-0.060%, V: 0-0.080%, Ti: -0.120%, B: 0-0.0035%, andAl: 0.010- 0.050%.
4. The method for manufacturing the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel according to claim 1, wherein the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel is composed of the following chemical composition in mass percentage: C: 0.13%-0.19%, Si: 0.10%-0.40%, Mn: 0.90%-1.65%, P < 0.016%, S < 0.003%, Cr: 0-0.40%, Ni: 0-0.40%, Mo: 0-0.35%, Cu: 0-0.35%, Nb: 0-0.050%, V: 0-0.080%, Ti: -0.120%, B: 0-0.0035%, andAl: 0.010-0.050%.
5. The method for manufacturing the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel according to claim 1, wherein, a thickness of the steel plate is 80 mm, and the steel plate is composed of the following chemical composition in mass percentage: C: 0.14%, Si: 0.27%, Mn: 1.53%, P: 0.011%, S: 0.003%, Cr: 0.35%, Ni: 0.18%, Mo: 0.22%, Cu: 0.17%, V: 0.035%, Ti: 0.019%, B: 0.0009%, andAl: 0.027%; the molten iron pretreatment is carried out so that the content of S in the molten iron is 0.002%; the converter steelmaking is carried out via the BOF process, then the deoxidizing and alloying are carried out; the LF refining is carried out for 25 min, and then the fine-tuning of the alloys is carried out so that the temperature of the molten steel reaches 1590 °C; the RH vacuum degassing is carried out for 30 min via the bottom-argon-blowing process to stir and float up to remove the non-metallic inclusions and reduce the contents of nitrogen, hydrogen, and oxygen; the calcium cored wire is fed to purify the molten steel so that the non-metallic inclusions is spheroidized; argon-blowing is carried out during the whole casting process for protection, the continuous casting is carried out with the casting speed of 0.88 m/min, and the electromagnetic stirring is carried out; the billet obtained is heated evenly at 1190 °C for 4.3 h; the two-stage rolling is carried out with the four-high reversing mill, the reduction rate for the rolling is 62%, the initial rolling temperature for the rough rolling is 1150 °C, and the initial rolling temperature and the final rolling temperature for the finish rolling in the second stage are 890 °C and 800 °C, respectively; the cooling is controlled, the self-tempering temperature of the steel plate obtained is 650 °C; the steel plate is straightened via the nine-roll straightener so that the unevenness of the steel plate is 5 mm/m; the shot peening is carried out to remove the iron oxide scales of the steel plate; the steel plate is heated in the non-oxidizing roller hearth furnace protected by nitrogen to 910 °C; the steel plate is quenched via the rolling waterjet at 890 °C; the steel plate is tempered in the roller hearth furnace at 530 °C; the inspection and identification of the finished product are carried out, and then the qualified products are stocked and delivered.
6. The method for manufacturing the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel according to claim 1, wherein, the thickness of the steel plate is 40 mm, and the steel plate is composed of the following chemical composition in mass percentage: C: 0.14%, Si: 0.30%, Mn: 1.51%, P: 0.014%, S: 0.001%, Cr: 0.36%, Ni: 0.21%, Mo: 0.13%, Cu: 0.15%, V: 0.033%, Ti: 0.017%, B: 0.0014%, andAl: 0.033%; the molten iron pretreatment is carried out so that the content of S in the molten iron is 0.001%; the converter steelmaking is carried out via the BOF process, then the deoxidizing and alloying are carried out; the LF refining is carried out for 24 min, and then the fine-tuning of the alloys is carried out so that the temperature of the molten steel reaches 1590 °C; the RH vacuum degassing is carried out for 30 min via the bottom-argon-blowing process to stir and float up to remove the non-metallic inclusions and reduce the contents of nitrogen, hydrogen, and oxygen; the calcium cored wire is fed to purify the molten steel so that the non-metallic inclusions is spheroidized; argon-blowing is carried out during the whole casting process for protection, the continuous casting is carried out with the casting speed of 0.88 m/min, and the electromagnetic stirring is carried out; the billet obtained is heated evenly at 1200 °C for 4.2 h; the two-stage rolling is carried out with the four-high reversing mill, the reduction rate for the rolling is 62%, the initial rolling temperature for the rough rolling is 1160 °C, and the initial rolling temperature and the final rolling temperature for the finish rolling in the second stage are 890 °C and 810 °C, respectively; the cooling is controlled, the self-tempering temperature of the steel plate obtained is 650 °C; the steel plate is straightened via the nine-roll straightener so that the unevenness of the steel plate is 5 mm/m; the shot peening is carried out to remove the iron oxide scales of the steel plate; the steel plate is heated in the non-oxidizing roller hearth furnace protected by nitrogen to 910 °C; the steel plate is quenched via the rolling waterjet at 890 °C; the steel plate is tempered in the roller hearth furnace at 535 °C; the inspection and identification of the finished product are carried out, and then the qualified products are stocked and delivered.
7. The method for manufacturing the 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel according to claim 1, wherein, the thickness of the steel plate is 8 mm, and the steel plate is composed of the following chemical composition in mass percentage: C: 0.15%, Si: 0.23%, Mn: 1.49%, P: 0.013%, S: 0.002%, Cr: 0.37%, Ni: 0.18%, Cu: 0.11%, V: 0.030%, Ti: 0.018%, B: 0.0012%, andAl: 0.019%; the molten iron pretreatment is carried out so that the content of S in the molten iron is 0.002%; the converter steelmaking is carried out via the BOF process, then the deoxidizing and alloying are carried out; the LF refining is carried out for 25 min, and then the fine-tuning of the alloys is carried out so that the temperature of the molten steel reaches 1590 °C; the RH vacuum degassing is carried out for 30 min via the bottom-argon-blowing process to stir and float up to remove the non-metallic inclusions and reduce the contents of nitrogen, hydrogen, and oxygen; the calcium cored wire is fed to purify the molten steel so that the non-metallic inclusions is spheroidized; argon-blowing is carried out during the whole casting process for protection, the continuous casting is carried out with the casting speed of 0.88 m/min, and the electromagnetic stirring is carried out; the billet obtained is heated evenly at 1180 °C for 4.4 h; the two-stage rolling is carried out with the four-high reversing mill, the reduction rate for the rolling is 63%, the initial rolling temperature for the rough rolling is 1140 °C, and the initial rolling temperature and the final rolling temperature for the finish rolling in the second stage are 940 °C and 850 °C, respectively; the cooling is controlled, the self-tempering temperature of the steel plate obtained is 620 °C; the steel plate is straightened via the nine-roll straightener so that the unevenness of the steel plate is 6 mm/m; the shot peening is carried out to remove the iron oxide scales of the steel plate; the steel plate is heated in the non-oxidizing roller hearth furnace protected by nitrogen to 910 °C; the steel plate is quenched via the rolling waterjet at 900 °C; the steel plate is tempered in the roller hearth furnace at 550 °C; the inspection and identification of the finished product are carried out, and then the qualified products are stocked and delivered.
8. A 690 MPa-graded easy-to-weld corrosion-resisting high-strength steel obtained through the method according to any one of claims I to 7.
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| CN112795840A (en) * | 2020-12-24 | 2021-05-14 | 舞阳钢铁有限责任公司 | 690 MPa-grade steel plate and production method thereof |
| CN112831726A (en) * | 2021-01-06 | 2021-05-25 | 鞍钢股份有限公司 | Coating-free high-carbon high-strength corrosion-resistant electromagnetic steel plate and production method thereof |
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| JPH07150238A (en) * | 1993-10-06 | 1995-06-13 | Sumitomo Metal Ind Ltd | Production of steel plate with high toughness and high tensile strength |
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