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

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...

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

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