CN103469077B - A kind of high silicon rolled sheet material and preparation technology thereof - Google Patents
A kind of high silicon rolled sheet material and preparation technology thereof Download PDFInfo
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- CN103469077B CN103469077B CN201310457659.5A CN201310457659A CN103469077B CN 103469077 B CN103469077 B CN 103469077B CN 201310457659 A CN201310457659 A CN 201310457659A CN 103469077 B CN103469077 B CN 103469077B
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Abstract
A kind of high silicon content design of the present invention, coordinates Q-tempering technology to improve the hardness of steel and the method for obdurability.Main component of the present invention: carbon: 0.18-0.28%; Silicon: 0.82-0.95%; Manganese: 1.50-1.90%; Titanium: 0.020-0.040%; Copper≤0.25%; Phosphorus≤0.015%; Sulphur≤0.012%; Surplus is iron and inevitable impurity.The loading owner sword plate High wear-resistant steel adopting the present invention to produce reaches excellent hardness and obdurability coupling, and tough brittle transition temperature is at subzero 20-28 DEG C.Hard phase content in tissue can reach 98%, hardness 400-440HBW; Subzero 20 DEG C of notch impact toughness 30-49 joules, the tensile strength scope of obdurability steel plate, at 1360-1460MPa, by temper, eliminates and organizes internal stress, improve plasticity index, and unit elongation can reach 12%.As can be seen here, the present invention compared with prior art, has substantial progress, and implementation result is remarkable, and temper resistance is better.Table 1 is traditional manganese 13 wear resisting steel and wear resisting steel performance comparison of the present invention, and cost reduces by 600 yuan/ton.
Description
Technical field
The present invention relates to be improve load owner's sword plate wear resisting steel hardness and obdurability Technology, be the design of a kind of high silicon content, coordinate Q-tempering technology to improve the hardness of steel and the method for obdurability.
Background technology
Traditional high manganese wear-resistant steel, Fe content reaches more than 13%, needs twice quenching heat treatment, water-tenacity treatment complex process, and the time is long, and cost is high; It is excessive that high mangaenese steel smelting adds manganese alloy amount, needs electric arc furnace smelting, and cast segregation is serious, and operation of rolling difficulty, is substantially not suitable for Rolling Production, produces mainly with electric furnace cast steel form.Load owner's sword plate majority and use cast member, price is high, and appearance quality is coarse, and do not have strong collision to lack and form martensitic transformation condition, work-ing life is not high.Carbon content at 0.70-1.0%, Fe content 13-14%, obvious welding property is poor; Low-temperature flexibility-0 DEG C of non-notch impact specimen ballistic work, at 6-17 joule, does not adapt to less than-20 DEG C environment, and band notched impact specimen toughness is higher than the technical requirements of 27 joules.
Summary of the invention
The object of the invention is for loading owner's sword plate technique defect and the market requirement, give up the deficiency of conventional high mangaenese steel technology, design reduces Fe content and carbon content, and suitable converter is smelted fast, provides a kind of high silicon rolled sheet material, Q-tempering technology improves the method for steel hardness and obdurability, obtain the metallographic structure of hard phase martensite, the method flow process be short, efficiency is high, easy to operate, be easy to welding, with low cost, realize revolving furnace continuous casting technology and control.
Main component of the present invention: carbon: 0.18-0.28%; Silicon: 0.82-0.95%; Manganese: 1.50-1.90%; Titanium: 0.020-0.040%; Copper≤0.25%; Phosphorus≤0.015%; Sulphur≤0.012%; Surplus is iron and inevitable impurity.
Processing step of the present invention has:
(1) LF external refining: 15 minutes heat-up times, make white slag desulfurization, adds microalloy adjustment titanium content;
(2) VD/RH vacuum outgas: vacuum 185-200Pa process 20 minutes, argon gas soft blow 10 minutes after line feeding.
(3) heating of plate blank: soaking temperature range 1100-1150 DEG C, soaking time scope 2.5-4.5 hour, by utilizing the TiN particle of small and dispersed and 950-970 DEG C of low-temperature heat to suppress Austenite Grain Growth, obtains tiny and uniform austenite crystal.
(4) roughing: start rolling temperature 1050-1100 DEG C, single pass draft 20-26%, by recrystallization softening austenite crystal repeatedly.
(5) finish rolling: start rolling temperature scope 920-970 DEG C, single pass draft 15-20%, imposes aximal deformation value in non-crystallization austenitic area, makes austenite crystal be drawn into deformation bands.
(6) quench: temperature 900-960 DEG C, speed of cooling scope 30-45 DEG C/s, form high density dislocation substructure, obtain 98% martensite metallographic microstructure of fine uniform.
(7) steel plate tempering: temperature 280 ~ 300 DEG C, soaking time control 2h.
In the present invention: soft blow refers to that ladle bottom blowing argon gas intensity makes molten steel be subject to evenly rationally stirring just, composition full and uniformization, gas, the floating such as to be mingled with, do not make molten steel acutely seethe and be exposed in air, with covering slag and air insulated, protection molten steel is not oxidized
Technical scheme difference with the prior art of the present invention: add silicon in technical solution of the present invention: 0.82-0.95%, can also add molybdenum boron etc., improves hardening capacity, improves the intensity hardness of steel.
beneficial effect of the present invention:the loading owner sword plate High wear-resistant steel adopting the present invention to produce reaches excellent hardness and obdurability coupling, and tough brittle transition temperature is at subzero 20-28 DEG C.Hard phase content in tissue can reach 98%, hardness 400-440HBW; Subzero 20 DEG C of notch impact toughness 30-49 joules, the tensile strength scope of obdurability steel plate, at 1360-1460MPa, by temper, eliminates and organizes internal stress, improve plasticity index, and unit elongation can reach 12%.As can be seen here, the present invention compared with prior art, has substantial progress, and implementation result is remarkable, and temper resistance is better.Table 1 is traditional manganese 13 wear resisting steel and wear resisting steel performance comparison of the present invention, and cost reduces by 600 yuan/ton.
embodiment:
Below in conjunction with concrete enforcement embodiment, the invention will be further described, but technical scheme of the present invention is not limited with specific embodiment.
embodiment 1
Slab melting composition is: C:0.23%, Si:0.85%, Mn:1.72%, P:0.010%, S:0.003%, Al:0.033%, Cu:0.11%, Ti:0.023%, and all the other are Fe and inevitable impurity.
Slab soaking temperature (DEG C): 1140; Soaking time (hour): 3.6; Roughing temperature (DEG C): 1080; Roughing single pass draft (%): be greater than 18; Final rolling temperature (DEG C): 980; Finish rolling single pass draft (%): be greater than 14; Quenching temperature (DEG C) 930; Speed of cooling (DEG C/s): 23; Tempering temperature (DEG C): 280; Tempering time (min): 120.
Mechanical property of steel plate:
Specification: steel plate thickness 30mm; Brinell hardness 439HBW; Yield strength (MPa): 1090; Tensile strength (MPa): 1440; Elongation after fracture (%): 10.5; Clod wash: qualified; V-type impact of collision merit (-20 DEG C): 38J, 39J, 33J.
embodiment 2
Slab melting composition is: C:0.23%, Si:0.85%, Mn:1.72%, P:0.010%, S:0.003%, Al:0.033%, Cu:0.11%, Ti:0.023%, and all the other are Fe and inevitable impurity.
Slab soaking temperature (DEG C): 1150; Soaking time (hour): 2.8; Roughing temperature (DEG C): 1130; Roughing single pass draft (%): be greater than 20; Final rolling temperature (DEG C): 960; Finish rolling single pass draft (%): be greater than 15; Heating temperature (DEG C) 920; Speed of cooling (DEG C/s): 30; Tempering temperature (DEG C): 290; Tempering time (min): 120.
Mechanical property of steel plate:
Specification: steel plate thickness 20mm; Brinell hardness 442HBW; Yield strength (MPa): 1050; Tensile strength (MPa): 1340; Elongation after fracture (%): 12; Clod wash: qualified; V-type impact of collision merit (-20 DEG C): 45J, 43J, 47J.
embodiment 3:
Slab melting composition is: C:0.23%, Si:0.94%, Mn:1.60%, P:0.014%, S:0.004%, Al:0.033%, Cu:0.12%, Ti:0.026%, and all the other are Fe and inevitable impurity.
Slab soaking temperature (DEG C): 1140; Soaking time (hour): 2.6; Roughing temperature (DEG C): 1100; Roughing single pass draft (%): be greater than 18; Final rolling temperature (DEG C): 980; Finish rolling single pass draft (%): be greater than 16; Heating temperature (DEG C) 940; Speed of cooling (DEG C/s): 26; Tempering temperature (DEG C): 270; Tempering time (min): 140.
Mechanical property of steel plate:
Specification: steel plate thickness 45mm; Brinell hardness 445HBW; Yield strength (MPa): 1070; Tensile strength (MPa): 1350; Elongation after fracture (%): 11; Clod wash: qualified; V-type impact of collision merit (-20 DEG C): 42J, 42J, 44J.
embodiment 4:
Slab melting composition is: C:0.28%, Si:0.89%, Mn:1.65%, P:0.017%, S:0.002%, Al:0.023%, Cu:0.15%, Ti:0.024%, and all the other are Fe and inevitable impurity.
Slab soaking temperature (DEG C): 1120; Soaking time (hour): 2.7; Roughing temperature (DEG C): 1110; Roughing single pass draft (%): be greater than 19; Final rolling temperature (DEG C): 970; Finish rolling single pass draft (%): be greater than 15; Heating temperature (DEG C) 910; Speed of cooling (DEG C/s): 28; Tempering temperature (DEG C): 280; Tempering time (min): 130.
Mechanical property of steel plate:
Specification: steel plate thickness 35mm; Brinell hardness 441HBW; Yield strength (MPa): 1045; Tensile strength (MPa): 1340; Elongation after fracture (%): 10.5; Clod wash: qualified; V-type impact of collision merit (-20 DEG C): 44J, 46J, 45J.
Claims (1)
1. a high silicon rolled sheet material, is characterized in that: be made up of the following component of the following meter of percentage by weight: carbon: 0.18-0.28%; Silicon: 0.82-0.95%; Manganese: 1.50-1.90%; Titanium: 0.020-0.040%; Copper≤0.25%; Phosphorus≤0.015%; Sulphur≤0.012%; Surplus is iron and inevitable impurity; Concrete steps are: LF external refining, VD/RH vacuum outgas, heating of plate blank, roughing, finish rolling, quenching, steel plate tempering; Described LF external refining operation: 15 minutes heat-up times, make white slag desulfurization, adds microalloy adjustment titanium content; Described VD/RH vacuum outgas operation: vacuum 185-200Pa process 20 minutes, argon gas soft blow 10 minutes after line feeding; Described heating of plate blank operation: soaking temperature range 1100-1150 DEG C, soaking time scope 2.5-4.5 hour, by utilizing the TiN particle of small and dispersed and 950-970 DEG C of low-temperature heat to suppress Austenite Grain Growth, obtain tiny and uniform austenite crystal; Described roughing operation: start rolling temperature 1050-1100 DEG C, single pass draft 20-26%, by recrystallization softening austenite crystal repeatedly; Described finishing rolling step: start rolling temperature scope 920-970 DEG C, single pass draft 15-20%, imposes aximal deformation value in non-crystallization austenitic area, makes austenite crystal be drawn into deformation bands; Described quenching process: temperature 900-960 DEG C, speed of cooling scope 30-45 DEG C/s, forms high density dislocation substructure, obtains 98% martensite metallographic microstructure of fine uniform; Described steel plate tempering process: temperature 280 ~ 300 DEG C, soaking time control 2h.
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| CN113846285A (en) * | 2021-10-11 | 2021-12-28 | 深圳市新元特钢有限公司 | High-purity steel block finish machining process |
| CN114395729B (en) * | 2021-12-13 | 2023-09-01 | 唐山中厚板材有限公司 | NM 450-grade wear-resistant steel plate without quenching heat treatment and production method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844434A (en) * | 2006-03-16 | 2006-10-11 | 武汉钢铁(集团)公司 | Steel for loader shovel tool blade and method for producing same |
| CN101688283A (en) * | 2007-05-29 | 2010-03-31 | 杰富意钢铁株式会社 | Abrasion-resistant steel sheet having excellent processability, and method for production thereof |
| CN102363859A (en) * | 2011-11-14 | 2012-02-29 | 湖南华菱湘潭钢铁有限公司 | Method for producing wear-resisting steel plate |
| CN103060689A (en) * | 2012-12-26 | 2013-04-24 | 宁波市瑞通新材料科技有限公司 | Preparation method of wear-resisting steel plate for mining machinery |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844434A (en) * | 2006-03-16 | 2006-10-11 | 武汉钢铁(集团)公司 | Steel for loader shovel tool blade and method for producing same |
| CN101688283A (en) * | 2007-05-29 | 2010-03-31 | 杰富意钢铁株式会社 | Abrasion-resistant steel sheet having excellent processability, and method for production thereof |
| CN102363859A (en) * | 2011-11-14 | 2012-02-29 | 湖南华菱湘潭钢铁有限公司 | Method for producing wear-resisting steel plate |
| CN103060689A (en) * | 2012-12-26 | 2013-04-24 | 宁波市瑞通新材料科技有限公司 | Preparation method of wear-resisting steel plate for mining machinery |
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