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A method for manufacturing a quenched high-strength steel plate for a large truck body structure

A high-strength steel plate and car body structure technology, which is applied in the manufacture of quenched high-strength steel plates for large truck body structures, to achieve the effects of saving operating time, saving production costs, and eliminating internal stress in the organization

Inactive Publication Date: 2016-04-13
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, car body supporting manufacturers used thick-gauge low-alloy Q345B or Q460C strength grade steel, which was far from meeting the demand.

Method used

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  • A method for manufacturing a quenched high-strength steel plate for a large truck body structure
  • A method for manufacturing a quenched high-strength steel plate for a large truck body structure
  • A method for manufacturing a quenched high-strength steel plate for a large truck body structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Slab smelting composition: C: 0.29%, Si: 0.25%, Mn: 1.67%, P: 0.013%, S: 0.002%, Al: 0.030%, Cu: 0.11%, Ti: 0.021%, B: 0.0025% ; Mo: 0.24%; the rest is Fe and unavoidable impurities.

[0024] 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; Finish rolling single pass reduction rate (%): greater than 15; Quenching heating temperature (°C) 920; Cooling rate (°C / s): 28;

[0025] Steel plate mechanical properties:

[0026] Specifications: steel plate thickness 35mm; Brinell hardness 460HB; yield strength (MPa): 1290; tensile strength (MPa): 1470; elongation after fracture (%): 10.5; cold bending: qualified; V-shaped longitudinal impact energy (- 20°C): 55J, 52J, 53J.

Embodiment 2

[0028] C: 0.18%, Si: 0.27%, Mn: 1.22%, P: 0.016%, S: 0.004%, Al: 0.027%, Cu: 0.11%, Ti: 0.023%, B: 0.0012%; Mo: 0.13%; The rest is Fe and unavoidable impurities.

[0029] 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; single-pass reduction rate of finishing rolling (%): greater than 15; heating temperature (°C) 920; cooling rate (°C / s): 28;

[0030] Steel plate mechanical properties:

[0031] Specifications: steel plate thickness 12mm; Brinell hardness 423HBW; yield strength (MPa): 1170; tensile strength (MPa): 1420; elongation after fracture (%): 10; cold bending: qualified; V-shaped longitudinal impact energy (- 20°C): 56J, 58J, 57J.

Embodiment 3

[0033] C: 0.24%, Si: 0.27%, Mn: 1.55%, P: 0.016%, S: 0.004%, Al: 0.027%, Cu: 0.11%, Ti: 0.023%, B: 0.0020%; Mo: 0.19%; The rest is Fe and unavoidable impurities.

[0034] Slab soaking temperature (°C): 1147; soaking time (hours): 3.2; rough rolling temperature (°C): 1145; rough rolling single pass reduction rate (%): greater than 20; finish rolling temperature (°C) : 950; single-pass reduction rate of finishing rolling (%): greater than 15; heating temperature (°C) 900; cooling rate (°C / s): 27;

[0035] Steel plate mechanical properties:

[0036] Specifications: steel plate thickness 20mm; Brinell hardness 441HBW; yield strength (MPa): 1200; tensile strength (MPa): 1430; elongation after fracture (%): 10; cold bending: qualified; V-shaped longitudinal impact energy (- 20°C): 54J, 53J, 51J.

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Abstract

The present invention relates to a process technology for improving the strength and toughness of large truck body structure steel plates used in mines. The steel plates of the present invention include: carbon: 0.18-0.30%; silicon: 0.15-0.35%; manganese: 1.20-1.70%; titanium: 0.020- 0.040%; copper ≤ 0.25%; phosphorus ≤ 0.015%; sulfur ≤ 0.012%; boron: 0.0015-0.0025%; Beneficial effects of the present invention: the high-strength steel used for the body structure of large trucks for mines produced by the present invention has achieved excellent strength-toughness matching, the ductile-brittle transition temperature is below -40°C, and the hardness is 420-460HBW; the tensile strength range of the steel plate At 1390-1530MPa.

Description

technical field [0001] The invention relates to a process technology for improving the strength and toughness of a large truck car body structural steel plate used in mines, and is a method for improving the strength and toughness of the steel by using a quenching technology designed with a molybdenum-boron alloy. Background technique [0002] Large trucks used for raw material transportation in ports, mines, and steel mills are often used for three months, and the body structure is worn out and deformed, requiring frequent reinforcement and repairs. Large-scale trucks carry heavy weights, which are severely impacted and eroded by the materials they carry, and the energy consumption of the weight is high. Therefore, technical requirements such as improving structural strength and toughness, prolonging service life, reducing weight and saving energy are put forward. In the past, car body supporting manufacturers used thick-gauge low-alloy Q345B or Q460C strength grade steel, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/16C21D8/02C21D1/18
Inventor 冯勇孙卫华刘晓东王金华周兰聚王南辉贾慧领胡淑娥侯东华谢晖周波彭新华
Owner JIGANG GRP