CN102121060A - Method for improving strength and toughness of high-strength steel for coal machine by utilizing ultra-fast cooling and steel plate self-tempering technologies - Google Patents
Method for improving strength and toughness of high-strength steel for coal machine by utilizing ultra-fast cooling and steel plate self-tempering technologies Download PDFInfo
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Abstract
The invention discloses a method for improving the strength and toughness of the high-strength steel for a coal machine by utilizing the ultra-fast cooling and steel plate self-tempering technologies. The method is characterized by comprising the following steps: heating a plate blank, performing rough rolling, performing finish rolling, performing ultra-fast cooling and performing steel plate self-tempering. Particularly, the soaking temperature and soaking time of the plate blank, the rough rolling initial rolling temperature, the rough rolling single-pass reduction ratio, the finish rolling initial rolling temperature, the finish rolling single-pass reduction ratio, the ultra-fast cooling initial cooling temperature, the ultra-fast cooling final cooling temperature, the ultra-fast cooling speed, the self-tempering stacking temperature, the self-tempering time and other parameters are controlled. Therefore, the produced high-strength steel for the coal machine has excellent combination of strength and toughness and the ductile transition temperature is below -60 DEG C. The hard phase content of the duplex structure can reach 30-40%, the tensile strength of the steel plate is 1200-1350MPa, and the yield ratio is lower and is about 0.80. By adopting the self-tempering treatment, the internal stress of the structure can be eliminated, so that the structure has 60-70% of soft phase, the plasticity index can be obviously increased and the elongation rate can reach 25%.
Description
Technical field:
What the present invention relates to is the Technology that improves the steel plate obdurability, is a kind of method of utilizing ultrafast cold-peace steel plate self-tempering technology to improve coal machine usefulness high-strength steel obdurability.
Background technology:
Prick in the cooling control technology in traditional control, because control cold energy power is limited, must accumulate more strain energy in the operation of rolling, mostly be to adopt that low temperature is depressed greatly, intense plastic strain, two-phase region are rolling etc. technology realizes, particularly in the cold stage of control, the convective exchange coefficient of water coolant and hot steel plate is much larger than the heat-conduction coefficient of steam and hot steel plate, and steam film is difficult for being broken, and does not have the cold effect of desirable control.Simultaneously, because inhomogeneous cooling is even, also easily cause camber of sheet.On performance index, the modal disadvantage of traditional cooling controlling and rolling controlling process is that the unit elongation of steel plate is low, does not have yield-point, and plasticity is poor.The practices well that addresses the aforementioned drawbacks at present is to remedy by thermal treatment process, but has increased cost, has prolonged the manufacturing cycle.
Summary of the invention:
The objective of the invention is weak point at present routine techniques, provide the ultrafast cold-peace steel plate of a kind of usefulness self-tempering technology to improve the method for coal machine with the high-strength steel obdurability, obtain hard phase martensite and heterogeneous structures such as soft granular bainite mutually, this method flow is short, efficient is high, easy to operate.
The technical solution used in the present invention, the processing step that comprises has: the slab reheat; Roughing; Finish rolling; Ultrafast cold; The steel plate self-tempering; Air cooling gets the finished product steel plate; Wherein:
The soaking temperature scope of described slab reheat is 1100-1150 ℃, and the soaking time scope is 2.5-4.0 hour; TiN particle by utilizing small and dispersed and low-temperature heat suppress austenite crystal grows up, and obtains tiny and uniform austenite crystal;
The start rolling temperature of described roughing is 1050-1100 ℃, and the single pass draft is greater than 20%; By recrystallize refine austenite crystal grain repeatedly;
The start rolling temperature scope of described finish rolling is 880-900 ℃, and the single pass draft is greater than 15%; Impose aximal deformation value in crystallization austenitic area not, make austenite crystal be drawn into deformation bands;
The described ultrafast cold cold temperature of opening is not less than 760 ℃, and final cooling temperature is lower than 420 ℃, and the speed of cooling scope is 30-45 ℃/s; Form the high-density substructure, obtain tiny and uniform complex phase microstructure;
Described steel plate self-tempering: utilize the waste heat of steel plate to carry out the stacking covering, the stacking temperature is 280～330 ℃, and soaking time is controlled at 1.5-2.0min/mm.
Further, utilize ultrafast cold-peace steel plate self-tempering technology to improve the method for coal machine with the high-strength steel obdurability, its processing parameter is that described slab soaking temperature is: 1120 ℃; Soaking time: 3.0 hours; Roughing start rolling temperature: 1080 ℃; Roughing single pass draft: greater than 22%; Finish rolling start rolling temperature: 890 ℃; Finish rolling single pass draft: greater than 16%; The ultrafast cold cold temperature of opening: 770 ℃; Ultrafast cold final cooling temperature: 390 ℃; Ultrafast cold but speed: 38 ℃/s; Self-tempering stacking temperature: 320 ℃; Self-tempering time 50min.
Further, utilize ultrafast cold-peace steel plate self-tempering technology to improve the method for coal machine with the high-strength steel obdurability, its processing parameter is that described slab soaking temperature is: 1150 ℃; Soaking time: 2.8 hours; Roughing start rolling temperature: 1120 ℃; Roughing single pass draft: greater than 20%; Finish rolling start rolling temperature: 900 ℃; Finish rolling single pass draft: greater than 18%; The ultrafast cold cold temperature of opening: 790 ℃; Ultrafast cold final cooling temperature: 400 ℃; Ultrafast cold but speed: 35 ℃/s; Self-tempering stacking temperature: 300 ℃; Self-tempering time 50min.
Further, utilize ultrafast cold-peace steel plate self-tempering technology to improve the method for coal machine with the high-strength steel obdurability, its processing parameter is that described slab soaking temperature is: 1100 ℃; Soaking time: 3.5 hours; Roughing start rolling temperature: 1070 ℃; Roughing single pass draft: greater than 25%; Finish rolling start rolling temperature: 880 ℃; Finish rolling single pass draft: greater than 20%; The ultrafast cold cold temperature of opening: 800 ℃; Ultrafast cold final cooling temperature: 390 ℃; Ultrafast cold but speed: 42 ℃/s; Self-tempering stacking temperature: 320 ℃; Self-tempering time 60min.
Further, utilize ultrafast cold-peace steel plate self-tempering technology to improve the method for coal machine with the high-strength steel obdurability, its processing parameter is that described slab soaking temperature is: 1130 ℃; Soaking time: 3.6 hours; Roughing start rolling temperature: 1100 ℃; Roughing single pass draft: greater than 30%; Finish rolling start rolling temperature: 900 ℃; Finish rolling single pass draft: greater than 18%; The ultrafast cold cold temperature of opening: 775 ℃; Ultrafast cold final cooling temperature: 420 ℃; Ultrafast cold but speed: 36 ℃/s; Self-tempering stacking temperature: 330 ℃; Self-tempering time 40min.
Further, utilize ultrafast cold-peace steel plate self-tempering technology to improve the method for coal machine with the high-strength steel obdurability, its processing parameter is that described slab soaking temperature is: 1120 ℃; Soaking time: 4.0 hours; Roughing start rolling temperature: 1090 ℃; Roughing single pass draft: greater than 22%; Finish rolling start rolling temperature: 900 ℃; Finish rolling single pass draft: greater than 19%; The ultrafast cold cold temperature of opening: 790 ℃; Ultrafast cold final cooling temperature: 400 ℃; Ultrafast cold but speed: 30 ℃/s; Self-tempering stacking temperature: 330 ℃; Self-tempering time 35min.
The invention has the beneficial effects as follows: the coal machine that adopts the present invention to produce has reached excellent obdurability coupling with high-strength steel, and tough brittle transition temperature is below-60 ℃.Hard phase content in the heterogeneous structure can reach 30-40%, and the tensile strength scope of steel plate is at 1200-1350MPa, and yield tensile ratio is lower, about 0.80.Handle by self-tempering, eliminated and organized internal stress, the soft phase constitution of 60-70% is arranged in the tissue in addition, obviously improved plasticity index, unit elongation can reach 25%.This shows that the present invention compared with prior art has substantial progress, implementation result is remarkable.
Embodiment:
The invention will be further described below in conjunction with concrete embodiment, but be not construed as limiting the invention.
Slab melting composition is:
C:0.05%, Si:0.38%, Mn:1.72%, P:0.010%, S:0.007%, Mo:0.25%, Al:0.033%, B:0.0011%, Nb:0.052%, Ti:0.013%, Ni:0.26%, all the other are Fe and unavoidable impurities.
Embodiment 1
The slab soaking temperature (℃): 1120; Soaking time (hour): 3.0; The roughing temperature (℃): 1080; Roughing single pass draft (%): greater than 22; Final rolling temperature (℃): 890; Finish rolling single pass draft (%): greater than 16; Ultrafast cold open cold temperature (℃): 770; Ultrafast cold final cooling temperature (℃): 390; Ultrafast cold but speed (℃/s): 38; Self tempering temperature (℃): 320; The self-tempering time (min): 50.
Rolling steel plate mechanical property:
Specification: steel plate thickness 30mm; Yield strength (MPa): 980; Tensile strength (MPa): 1209; Yield tensile ratio: 0.81; Elongation after fracture (%): 22.5; Clod wash: qualified; V-type impact of collision merit (40 ℃): 180J, 182J, 193J; V-type impact of collision merit (60 ℃): 132J, 152J, 161J.
Embodiment 2
The slab soaking temperature (℃): 1150; Soaking time (hour): 2.8; The roughing temperature (℃): 1120; Roughing single pass draft (%): greater than 20; Final rolling temperature (℃): 900; Finish rolling single pass draft (%): greater than 18; Ultrafast cold open cold temperature (℃): 790; Ultrafast cold final cooling temperature (℃): 400; Ultrafast cold but speed (℃/s): 35; Self tempering temperature (℃): 300; The self-tempering time (min): 50.
Rolling steel plate mechanical property:
Specification: steel plate thickness 28mm; Yield strength (MPa): 950; Tensile strength (MPa): 1202; Yield tensile ratio: 0.79; Elongation after fracture (%): 20.5; Clod wash: qualified; V-type impact of collision merit (40 ℃): 150J, 132J, 173J; V-type impact of collision merit (60 ℃): 112J, 103J, 122J.
Embodiment 3
The slab soaking temperature (℃): 1100; Soaking time (hour): 3.5; The roughing temperature (℃): 1070; Roughing single pass draft (%): greater than 25; Final rolling temperature (℃): 880; Finish rolling single pass draft (%): greater than 20; Ultrafast cold open cold temperature (℃): 800; Ultrafast cold final cooling temperature (℃): 390; Ultrafast cold but speed (℃/s): 42; Self tempering temperature (℃): 320; The self-tempering time (min): 60.
Rolling steel plate mechanical property:
Specification: steel plate thickness 35mm; Yield strength (MPa): 1078; Tensile strength (MPa): 1315; Yield tensile ratio: 0.82; Elongation after fracture (%): 19.5; Clod wash: qualified; V-type impact of collision merit (40 ℃): 99J, 115J, 133J; V-type impact of collision merit (60 ℃): 92J, 105J, 116J.
Embodiment 4
The slab soaking temperature (℃): 1130; Soaking time (hour): 3.6; The roughing temperature (℃): 1100; Roughing single pass draft (%): greater than 30; Final rolling temperature (℃): 900; Finish rolling single pass draft (%): greater than 18; Ultrafast cold open cold temperature (℃): 775; Ultrafast cold final cooling temperature (℃): 420; Ultrafast cold but speed (℃/s): 36; Self tempering temperature (℃): 330; The self-tempering time (min): 40.
Rolling steel plate mechanical property:
Specification: steel plate thickness 22mm; Yield strength (MPa): 1065; Tensile strength (MPa): 1330; Yield tensile ratio: 0.80 elongation after fracture (%): 23.0; Clod wash: qualified; V-type impact of collision merit (40 ℃): 125J, 151J, 133J; V-type impact of collision merit (60 ℃): 100J, 122J, 107J.
Embodiment 5
The slab soaking temperature (℃): 1120; Soaking time (hour): 4.0; The roughing temperature (℃): 1090; Roughing single pass draft (%): greater than 22; Final rolling temperature (℃): 900; Finish rolling single pass draft (%): greater than 19; Ultrafast cold open cold temperature (℃): 790; Ultrafast cold final cooling temperature (℃): 400; Ultrafast cold but speed (℃/s): 30; Self tempering temperature (℃): 330; The self-tempering time (min): 35.
Rolling steel plate mechanical property:
Specification: steel plate thickness 18mm; Yield strength (MPa): 990; Tensile strength (MPa): 1285; Yield tensile ratio: 0.77; Elongation after fracture (%): 25.0; Clod wash: qualified; V-type impact of collision merit (40 ℃): 112J, 162J, 113J; V-type impact of collision merit (60 ℃): 100J, 127J, 101J.
Claims (6)
1. one kind is utilized ultrafast cold-peace steel plate self-tempering technology to improve the method for coal machine with the high-strength steel obdurability, and its processing step comprises: the slab reheat; Roughing; Finish rolling; Ultrafast cold; The steel plate self-tempering; Air cooling gets the finished product steel plate; Wherein:
The soaking temperature scope of described slab reheat is 1100-1150 ℃, and the soaking time scope is 2.5-4.0 hour; TiN particle by utilizing small and dispersed and low-temperature heat suppress austenite crystal grows up, and obtains tiny and uniform austenite crystal;
The start rolling temperature of described roughing is 1050-1100 ℃, and the single pass draft is greater than 20%; By recrystallize refine austenite crystal grain repeatedly;
The start rolling temperature scope of described finish rolling is 880-900 ℃, and the single pass draft is greater than 15%; Impose aximal deformation value in crystallization austenitic area not, make austenite crystal be drawn into deformation bands;
The described ultrafast cold cold temperature of opening is not less than 760 ℃, and final cooling temperature is lower than 420 ℃, and the speed of cooling scope is 30-45 ℃/s; Form the high-density substructure, obtain tiny and uniform complex phase microstructure;
Described steel plate self-tempering: utilize the waste heat of steel plate to carry out the stacking covering, the stacking temperature is 280～330 ℃, and soaking time is controlled at 1.5-2.0min/mm.
2. the method for utilizing ultrafast cold-peace steel plate self-tempering technology to improve coal machine usefulness high-strength steel obdurability according to claim 1 is characterized in that described slab soaking temperature is: 1120 ℃; Soaking time: 3.0 hours; Roughing start rolling temperature: 1080 ℃; Roughing single pass draft: greater than 22%; Finish rolling start rolling temperature: 890 ℃; Finish rolling single pass draft: greater than 16%; The ultrafast cold cold temperature of opening: 770 ℃; Ultrafast cold final cooling temperature: 390 ℃; Ultrafast cold but speed: 38 ℃/s; Self-tempering stacking temperature: 320 ℃; Self-tempering time 50min.
3. the method for utilizing ultrafast cold-peace steel plate self-tempering technology to improve coal machine usefulness high-strength steel obdurability according to claim 1 is characterized in that described slab soaking temperature is: 1150 ℃; Soaking time: 2.8 hours; Roughing start rolling temperature: 1120 ℃; Roughing single pass draft: greater than 20%; Finish rolling start rolling temperature: 900 ℃; Finish rolling single pass draft: greater than 18%; The ultrafast cold cold temperature of opening: 790 ℃; Ultrafast cold final cooling temperature: 400 ℃; Ultrafast cold but speed: 35 ℃/s; Self-tempering stacking temperature: 300 ℃; Self-tempering time 50min.
4. the method for utilizing ultrafast cold-peace steel plate self-tempering technology to improve coal machine usefulness high-strength steel obdurability according to claim 1 is characterized in that described slab soaking temperature is: 1100 ℃; Soaking time: 3.5 hours; Roughing start rolling temperature: 1070 ℃; Roughing single pass draft: greater than 25%; Finish rolling start rolling temperature: 880 ℃; Finish rolling single pass draft: greater than 20%; The ultrafast cold cold temperature of opening: 800 ℃; Ultrafast cold final cooling temperature: 390 ℃; Ultrafast cold but speed: 42 ℃/s; Self-tempering stacking temperature: 320 ℃; Self-tempering time 60min.
5. the method for utilizing ultrafast cold-peace steel plate self-tempering technology to improve coal machine usefulness high-strength steel obdurability according to claim 1 is characterized in that described slab soaking temperature is: 1130 ℃; Soaking time: 3.6 hours; Roughing start rolling temperature: 1100 ℃; Roughing single pass draft: greater than 30%; Finish rolling start rolling temperature: 900 ℃; Finish rolling single pass draft: greater than 18%; The ultrafast cold cold temperature of opening: 775 ℃; Ultrafast cold final cooling temperature: 420 ℃; Ultrafast cold but speed: 36 ℃/s; Self-tempering stacking temperature: 330 ℃; Self-tempering time 40min.
6. the method for utilizing ultrafast cold-peace steel plate self-tempering technology to improve coal machine usefulness high-strength steel obdurability according to claim 1 is characterized in that described slab soaking temperature is: 1120 ℃; Soaking time: 4.0 hours; Roughing start rolling temperature: 1090 ℃; Roughing single pass draft: greater than 22%; Finish rolling start rolling temperature: 900 ℃; Finish rolling single pass draft: greater than 19%; The ultrafast cold cold temperature of opening: 790 ℃; Ultrafast cold final cooling temperature: 400 ℃; Ultrafast cold but speed: 30 ℃/s; Self-tempering stacking temperature: 330 ℃; Self-tempering time 35min.
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| CN110468330A (en) * | 2019-08-27 | 2019-11-19 | 南京钢铁股份有限公司 | Exempt to be heat-treated single-track turnout weather-resistant steel plate and preparation method |
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