Wear-resistant steel with good forming performance for dumper carriage body and production method thereof

A technology of formability and production method, applied in wear-resistant steel for dump car body with good formability and its production field, can solve U-shaped bending deformation, unqualified formability, high-strength wear-resistant steel plate processing two Eliminates problems such as secondary warping and deformation, and achieves good forming performance

Active Publication Date: 2020-04-07
HANDAN IRON & STEEL GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of manufacturing wear-resistant steel substrates into dump truck compartments, it usually goes through processes such as "cutting", "U-shaped bending", "opening", and "welding". Among them, "cutting", "U-shaped bending" When bending, high-strength wear-resistant steel plates often appear secondary bending deformation, or U-shaped bending deformation is inconsistent, resulting in inconsistent flatness and size.
The thickness of the steel plate with secondary bending deformation or inconsistent U-bending deformation is usually ≤16mm, especiall

Method used

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  • Wear-resistant steel with good forming performance for dumper carriage body and production method thereof
  • Wear-resistant steel with good forming performance for dumper carriage body and production method thereof
  • Wear-resistant steel with good forming performance for dumper carriage body and production method thereof

Examples

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Effect test

Embodiment 1

[0054] Example 1: Pure molten steel is obtained by smelting, and then a defect-free cast slab is produced by continuous casting at constant pulling speed, electromagnetic stirring, and dynamic light reduction. The weight percentage of its composition is: C: 0.16%, Si: 0.15%, Mn: 0.90%, P: 0.018%, S: 0.010%, Als: 0.020%, Nb: 0.020%, Ti: 0.012%, Cr: 0.30%, Mo: 0.10%, B: 0.0005%, O: 0.0025%, N: 0.0050%, H: 1.8ppm, the rest is Fe and unavoidable impurities; the reheating temperature range of the slab is 1120°C, and the soaking period is 30 minutes to eliminate the temperature gradient.

[0055] Double-pass controlled rolling process, that is, rough rolling in the austenite recrystallization zone + finishing rolling in the austenite non-recrystallization zone controlled rolling, rough rolling in the austenite recrystallization zone deformation austenite grain uniformity control process , in order to ensure uniform deformed austenite grains, the reduction rate of each pass is gradua...

Embodiment 2

[0066] Example 2: Purified molten steel is obtained by smelting, and then a defect-free cast slab is produced by technologies such as constant pulling speed continuous casting, electromagnetic stirring, and dynamic soft reduction, and its composition weight percentage is: C: 0.18%, Si: 0.20 %, Mn: 1.00%, P: 0.015%, S: 0.008%, Als: 0.030%, Nb: 0.025%, Ti: 0.015%, Cr: 0.40%, Mo: 0.15%, B: 0.0009%, O: 0.0020 %, N: 0.0045%, H: 1.5ppm, the rest is Fe and unavoidable impurities. The reheating temperature range of the slab is 1160°C, and the soaking period is 40 minutes to eliminate the temperature gradient;

[0067] Double-pass controlled rolling process, that is, rough rolling in the austenite recrystallization zone + finishing rolling in the austenite non-recrystallization zone controlled rolling, rough rolling in the austenite recrystallization zone deformation austenite grain uniformity control process , in order to ensure uniform deformed austenite grains, the reduction rate o...

Embodiment 3

[0078] Example 3: Pure molten steel is obtained by smelting, and then a defect-free cast slab is produced by technologies such as constant pulling speed continuous casting, electromagnetic stirring, and dynamic light reduction. The composition weight percentage is: C: 0.20%, Si: 0.23 %, Mn: 1.2%, P: 0.013%, S: 0.007%, Als: 0.045%, Nb: 0.035%, Ti: 0.021%, Cr: 0.45%, Mo: 0.18%, B: 0.0011%, O: 0.0022 %, N: 0.0040%, H: 1.4ppm, the rest is Fe and unavoidable impurities. The reheating temperature range of the slab is 1150°C, and the soaking period is 45 minutes to eliminate the temperature gradient.

[0079] Double-pass controlled rolling process, that is, rough rolling in the austenite recrystallization zone + finishing rolling in the austenite non-recrystallization zone controlled rolling, rough rolling in the austenite recrystallization zone deformation austenite grain uniformity control process , in order to ensure uniform deformed austenite grains, the reduction rate of each p...

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Abstract

The invention discloses wear-resistant steel with good forming performance for a dumper carriage body. Weight percentages of chemical components of the wear-resistant steel are as follows, 0.16-0.22%of C; 0.15-0.35% of Si; 0.90-1.30% of Mn; less than or equal to 0.018% of P, less than or equal to 0.010% of S, 0.020-0.060% of Als; 0.020-0.060% of Nb; 0.012-0.028% of Ti, 0.30-0.70% of Cr, 0.10-0.20% of Mo, 0.0005-0.0018% of B, less than or equal to 0.0025% of O, less than or equal to 0.0050% of N, less than or equal to 1.8 ppm of H and the balance of Fe and inevitable impurities. In the production method, the controlled rolling process comprises the rough rolling process, and austenite recrystallization zone deformed austenite grain uniformity control is carried out in the rough rolling process, and the pass reduction rate is controlled to gradually increase. The wear-resistant steel is advantaged in that the microstructure of the base plate is mainly composed of fine lath martensite, martensite lath size and mechanical property through plate distribution are uniform, a steel plate uniformly extends in all directions during stretching, cutting and U-shaped bending, consistency of machining and forming is guaranteed, straightness of the steel plate ranges from 1 mm/2 m to 4 mm/2 m after the steel plate is cut into narrow strips, straightness of a bent end is not larger than 3 mmafter the steel plate is bent in a U shape, and good forming performance is achieved.

Description

technical field [0001] The invention relates to a wear-resistant steel and a production method thereof, in particular to a wear-resistant steel for a dump car body with good formability and a production method thereof. Background technique [0002] China's special-purpose vehicle market is developing rapidly. Compared with European standards, the weight of Chinese special-purpose vehicles is 17% higher on average, which means more fuel consumption, more CO 2 emissions and lower loads, and the key to solving these problems lies in the application and process of new materials. Through light weight, vehicles can save fuel by 25%~37%. At present, multi-material body structure design has become a development trend. By optimizing the body structure, it can not only improve vehicle performance but also significantly reduce its own weight. At present, high-strength steel, wear-resistant steel and aluminum have become the main materials, emphasizing the use of suitable materials for...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C22C38/22C22C38/32C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32
Inventor 刘红艳王昭东陈子刚吕德文邓想涛杜琦铭姚宙张卫攀徐桂喜
Owner HANDAN IRON & STEEL GROUP
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