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Low-alloy wear-resistant steel with good bending formability and production method thereof

A technology of bending forming and production method, which is applied to low-alloy wear-resistant steel with good bending forming performance and its production field, which can solve the problem of restricting the application range of high-end low-alloy wear-resistant steel products, and is not suitable for ultra-high-strength martensitic steel. The problems of body wear-resistant steel and other problems are achieved, and the effect of fine microstructure, excellent bending and forming performance, and good strength and toughness is achieved.

Active Publication Date: 2022-01-25
HANDAN IRON & STEEL GROUP +1
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Problems solved by technology

The existing processing and forming methods are not suitable for ultra-high-strength martensitic wear-resistant steel, which seriously restricts the application range of high-end low-alloy wear-resistant steel products

Method used

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  • Low-alloy wear-resistant steel with good bending formability and production method thereof
  • Low-alloy wear-resistant steel with good bending formability and production method thereof
  • Low-alloy wear-resistant steel with good bending formability and production method thereof

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Embodiment Construction

[0037] The core control process of the present invention is based on the following: (1) at first utilize the DIL805L phase change dilatometer to measure the phase transition laws of different isothermal times and different cooling rates of the composition system, and the experimental results are shown in Table 1, figure 1 As shown in Table 1, figure 1 It shows that the Ac3 (full austenitization temperature of the steel plate) is 827°C. In order to ensure the full and uniform austenitization of the steel plate in the thickness direction and length direction, the quenching heat treatment heating and holding temperature is 30°C to 60°C above Ac3, and the cooling rate reaches Martensitic transformation begins at 20°C / s, and the martensite transformation temperature is 415°C. As the cooling rate increases, the martensite transformation temperature gradually decreases from 415°C to 379°C, and the martensite transformation temperature The end temperature is gradually reduced from 246...

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Abstract

The low-alloy wear-resistant steel with good bending and forming properties of the present invention has the following chemical composition weight percentages: C: 0.24~0.30, Si: 0.15~0.38, Mn: 0.60~1.00, P≤0.013, S≤0.005, Als: 0.045 ~0.075, Nb: 0.015~0.060, Ti: 0.010~0.025, Cr: 0.40~0.75, Mo: 0.10~0.35, B: 0.0005~0.0018, O≤0.0025, N≤0.0045, H≤1.7ppm, the rest are Fe and unavoidable impurities. The heat treatment process includes gradient heating + constrained quenching + low temperature tempering; the first and second stages of gradient heating are rapid heating sections, the heating temperature of the first stage is 890~930°C; the heating temperature of the second stage is 880°C~920°C; the third stage It is the heat preservation and soaking section, and the heat preservation temperature is 870℃~910℃; the first stage of constrained quenching is constrained quenching by hydraulic ring pressure roller, the upper pressure roller rises or falls with the frame, the working stroke is 6~52mm, and the constraint force is 240~350MPa; The second stage is constrained quenching with hydraulic flat rollers, working stroke 5~52mm, binding force 255~360MPa; the third stage is ordinary flat roller constrained quenching, working stroke 5~52mm, binding force 275~370MPa; low temperature tempering temperature 150 ℃~240℃. The wear-resistant steel of the invention has good toughness, wear resistance and bending forming performance.

Description

technical field [0001] The invention relates to a low-alloy wear-resistant steel and a production method thereof, in particular to a low-alloy wear-resistant steel with good bending forming performance and a production method thereof. Background technique [0002] Low-alloy wear-resistant steel series products have the characteristics of high strength, high hardness, high wear resistance, high low-temperature impact toughness, etc., and have certain processing and forming properties, and are quickly used in construction machinery, mining, agricultural machinery, special vehicle manufacturing, shipbuilding, and construction , oil and gas transportation and other industries are widely used. With the rapid development of my country's industry, all kinds of mechanical equipment are becoming more and more complex, large-scale and lightweight, and higher requirements are put forward for the low-alloy high-strength wear-resistant steel used to manufacture these mechanical equipment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32C21D9/46C21D1/673C21D1/18
CPCC22C38/02C22C38/04C22C38/002C22C38/06C22C38/001C22C38/26C22C38/28C22C38/22C22C38/32C21D1/18C21D1/673C21D9/46C21D2211/008
Inventor 刘红艳吕德文杜琦铭姚宙张卫攀徐桂喜王青云梅东贵刘涛飞
Owner HANDAN IRON & STEEL GROUP
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