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

A bending forming and production method technology, applied in the direction of furnace types, manufacturing tools, furnaces, etc., can solve the problems that restrict the application range of high-end low-alloy wear-resistant steel products, and are not suitable for ultra-high-strength martensitic wear-resistant steel, etc. Achieve the effects of fine microstructure, excellent bending and forming performance, and good strength and toughness

Active Publication Date: 2020-07-31
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 forming performance and production method thereof
  • Low-alloy wear-resistant steel with good bending forming performance and production method thereof
  • Low-alloy wear-resistant steel with good bending forming performance 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 invention relates to low-alloy wear-resistant steel with good bending forming performance. The low-alloy wear-resistant steel comprises the following chemical components in percentage by weight: 0.24-0.30% of C, 0.15-0.38% of Si, 0.60-1.00% of Mn, less than or equal to 0.013% of P, less than or equal to 0.005% of S, 0.045-0.075% of Als, 0.015-0.060% of Nb, 0.010-0.025% of Ti, 0.40-0.75% of Cr,0.10-0.35% of Mo, 0.0005-0.0018% of B, less than or equal to 0.0025% of O, less than or equal to 0.0045% of N, less than or equal to 1.7ppm of H and the balance Fe and inevitable impurities. A heat treatment process comprises gradient heating, constraint quenching and low-temperature tempering, wherein the first stage and the second stage of gradient heating are rapid heating sections, the heating temperature in the first stage is 890-930 DEG C, the heating temperature in the second stage is 880-920 DEG C, the third stage is a heat preservation soaking section, the heat preservation temperature is 870-910 DEG C, the first stage of constraint quenching is hydraulic annular compression roller constraint quenching, an upper compression roller ascends or descends along with a frame, the working stroke is 6-52mm, and the constraint force is 240-350MPa; the second stage is hydraulic flat compression roller constraint quenching, the working stroke is 5-52mm, and the constraint force is 255-360MPa; the third stage is common flat compression roller constraint quenching, the working stroke is 5-52mm, and the constraint force is 275-370MPa; and the low-temperature tempering temperature is 150-240 DEG C. The wear-resistant steel disclosed by 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 Applications(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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