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Method for improving performance of steel plate by adjusting manganese titanium boron content

A steel plate, content technology, applied in the field of smelting, to achieve the effect of improving the plasticity index, eliminating the internal stress of the organization, and the implementation effect is remarkable

Inactive Publication Date: 2014-01-01
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]Traditional high-manganese wear-resistant steel has a manganese content of more than 13% and a carbon content of 0.70-1.0%. Long, high cost; the amount of manganese alloy added to the smelting of high manganese steel is too large, which requires electric arc furnace smelting, serious pouring segregation, difficult rolling process, basically not suitable for rolling production, and mostly produced in the form of electric furnace cast steel
Most of the main blades of loaders and blades of motor graders are made of castings, which are expensive, rough in appearance, lack of strong collision and lack of martensite transformation conditions, and low service life
The content of carbon and manganese is too high to perform good welding; the low temperature toughness is poor, so it is not suitable for use in cold regions; the cost is high, which is not conducive to energy saving and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The slab smelting composition is:

[0026] C: 0.29%, Si: 0.35%, Mn: 1.42%, P: 0.013%, S: 0.001%, Al: 0.033%, Cu: 0.11%, Ti: 0.023%, B: 0.0013%, the rest is Fe and not Avoid impurities.

[0027] Slab soaking temperature (°C): 1120; soaking time (hours): 3.5; rough rolling temperature (°C): 1090; rough rolling single pass reduction rate (%): greater than 21; finish rolling temperature (°C) : 960; single-pass reduction rate of finishing rolling (%): greater than 15; quenching heating temperature (°C) 920; cooling rate (°C / s): 23; tempering temperature (°C): 250; tempering time (min ): 120.

[0028] Steel plate mechanical properties:

[0029] Specifications: steel plate thickness 32mm; Brinell hardness 479HBW; yield strength (MPa): 1390; tensile strength (MPa): 1490; elongation after fracture (%): 10.0; cold bending: qualified; V-shaped longitudinal impact energy (- 20°C): 37J, 35J, 36J;

Embodiment 2

[0031] C: 0.29%, Si: 0.35%, Mn: 1.42%, P: 0.013%, S: 0.001%, Al: 0.033%, Cu: 0.11%, Ti: 0.023%, B: 0.0013%, the rest is Fe and not Avoid impurities.

[0032] Slab soaking temperature (°C): 1150; soaking time (hours): 2.8; rough rolling temperature (°C): 1130; rough rolling single pass reduction rate (%): greater than 20; finish rolling temperature (°C) : 960; Finish rolling single pass reduction rate (%): greater than 15; Heating temperature (°C) 920; Cooling rate (°C / s): 22; Tempering temperature (°C): 240; Tempering time (min) : 120.

[0033] Steel plate mechanical properties:

[0034] Specifications: steel plate thickness 28mm; Brinell hardness 472HBW; yield strength (MPa): 1390; tensile strength (MPa): 1480; elongation after fracture (%): 10; cold bending: qualified; V-shaped longitudinal impact energy (- 20°C): 34J, 34J, 35J.

Embodiment 3

[0036] The slab smelting composition is:

[0037] C: 0.24%, Si: 0.32%, Mn: 1.67%, P: 0.014%, S: 0.002%, Al: 0.030%, Cu: 0.13%, Ti: 0.025%, B: 0.0017%, the rest is Fe and not Avoid impurities.

[0038] Slab soaking temperature (°C): 1128; soaking time (hours): 3.7; rough rolling temperature (°C): 1100; rough rolling single pass reduction rate (%): greater than 20; finish rolling temperature (°C) : 970; Finish rolling single pass reduction rate (%): greater than 15; Quenching heating temperature (°C) 932; Cooling rate (°C / s): 22; Tempering temperature (°C): 280; Tempering time (min ): 120.

[0039] Steel plate mechanical properties:

[0040] Specifications: steel plate thickness 40mm; Brinell hardness 467HBW; yield strength (MPa): 1340; tensile strength (MPa): 1450; elongation after fracture (%): 10.8; cold bending: qualified; V-shaped longitudinal impact energy (- 20°C): 42J, 45J, 46J;

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Abstract

Belonging to the technical field of smelting, the invention specifically relates to a method for improving performance of a steel plate by adjusting manganese titanium boron content. The method for improving performance of the steel plate by adjusting manganese titanium boron content is characterized in that the steel plate comprises the following components: 0.21-0.30% of C, 0.15-0.50% of silicon, 1.30-1.90% of manganese, 0.020-0.040% of Ti, no more than 0.25% of copper, no more than 0.015% of phosphorus, no more than 0.010% of sulfur, 0.0008-0.0025% of boron, and the balance of iron and inevitable purities. High wear resistant steel for main edge plate, bulldozer and grader shovel edge produced by the invention reaches excellent hardness and strength and toughness coupling, brittle-ductile transition temperature below -20 DEG C, hard phase content in the tissue reaching 98%, Brinell hardness of 430-490 HBW and tensile strength of 1380-1490 MPa. A tempering treatment eliminates internal stress in the tissue, increases plasticity indexes and realizes elongation percentage of 12%. Therefore, compared with the prior art, the present invention makes obvious substantive progress and the enforcement effect is substantial.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a method for improving the performance of a steel plate by adjusting the content of manganese, titanium and boron. Background technique [0002] The traditional high-manganese wear-resistant steel has a manganese content of more than 13% and a carbon content of 0.70-1.0%. It requires two quenching heat treatments. The water-toughening treatment process is complicated, takes a long time, and costs a lot; the amount of manganese alloy added to high-manganese steel smelting is too large , requires electric arc furnace smelting, serious pouring segregation, difficult rolling process, basically not suitable for rolling production, and mostly produced in the form of electric furnace cast steel. Most of the main blades of loaders and blades of motor graders are made of castings, which are expensive, rough in appearance, lack of strong collision and lack of conditions for m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/16C21D8/02
Inventor 冯勇孙卫华刘晓东孙风晓王宪德张磊王南辉贾慧领贾希光史金柱谢晖毕玉顺宋雷明
Owner JIGANG GRP
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