Abrasion resistant steel plate having low-temperature toughness, and manufacturing method therefor

Abstract

Provided are an abrasion resistant steel plate having excellent low-temperature toughness, and a manufacturing method therefor. The steel plate, which has a Brinell hardness (HBW10/3000) of 361 or more, and a plate thickness of 6-125 mm, contains 50/100 µm2 or more of fine precipitates having a diameter of 50 nm or less in lath-martensite steel that has crystal grains which are surrounded by high angle grain boundaries of a misorientation of 15° or more, and have an average particle size of 20 µm or less. The steel contains, by mass%, C: 0.10% to less than 0.20%, Si: 0.05-0.5%, Mn: 0.5-1.5%, Cr: 0.05-1.20%, Nb: 0.01-0.08%, B: 0.0005-0.003%, Al: 0.01-0.08%, N: 0.0005-0.008%, P: 0.05% or less, S: 0.005% or less, and O: 0.008% or less, moreover contains, as required, one or more rare earth elements from among Mo, V, Ti, Nd, Cu, Ni, W, Ca, and Mg, and satisfies 0.03 ≤ Nb+Ti+Al+V ≤ 0.14, with the remainder being constituted by Fe and unavoidable impurities. The steel is cast, and after rolling, is reheated to the Ac3 transformation point or higher, and successively quenched from the Ar3 transformation point or higher to a temperature of 250°C or less by water cooling. As required, the steel is reheated to 1100°C or more, the rolling reduction of a non-recrystallisation region is 30% or more, and the steel is cooled by water cooling to a temperature of 250°C or less, and reheated at a rate of 1°C/s or more to the Ac3 transformation point or higher.

Description

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AI Technical Summary

Benefits of technology

The technical effect that this patented technology provides for an improved type of metal material with high resistance against abrasions caused by extreme conditions such as temperature changes without losing its strength properties over time. This makes it suitable for use in industrial applications where severe environmental factors are likely causing damage from impacting objects during their lifetime.

Problems solved by technology

The technical problem addressed in this patents relating to improving the performance of wear resistant steels that are suitable for applications involving extreme conditions like mineral exploitation has been finding ways to enhance their resistance against damage caused by impact from rocks while still maintaining good millable properties at room temperature without compromising its strength.

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