Steel for linear guide rail and hot-rolling production method for steel

Abstract

The invention relates to steel for a linear guide rail. The steel is prepared from the following chemical components in percentage by weight: 0.40-0.70% of C, 0.15-0.40% of Si, 1.30-1.80% of Mn, 0.30-0.60% of Cr, 0.005-0.030% of S, less than or equal to 0.025% of P, less than or equal to 0.25% of Ni, less than or equal to 0.30% of Cu, less than or equal to 0.10% of Mo, less than or equal to 0.05%of Al, less than or equal to 0.0010% of Ca, less than or equal to 0.003% of Ti, less than or equal to 0.0010% of O, less than or equal to 0.04% of As, less than or equal to 0.03% of Sn, less than or equal to 0.005% of Sb, less than or equal to 0.002% of Pb, and the balance of Fe and inevitable impurities. After being subjected to quenching and tempering, the steel has yield strength higher than orequal to 785 MPa, tensile strength higher than or equal to 930 MPa, ductility higher than or equal to 12%, and Charpy impact work AKU higher than or equal to 50 J at the normal temperature. Non-metalimpurities meet the following relationship: A-series fine system less than or equal to 1.5, A-series rough system less than or equal to 1.0, B-series fine system less than or equal to 1.5, B-series rough system less than or equal to 1.0, C-series fine system equal to 0, C-series rough system equal to 0, D-series fine system less than or equal to 1.0, D-series rough system less than or equal to 0.5, Ds-series less than or equal to 1.0. Main process comprises electric furnace or converter-external refining-VD or RH vacuum degassing-continuous casting-continuous rolling-stack cooling. By optimizing chemical components of a steel plate, hardenability, strength and wear resistance of the steel are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of special steel smelting, and in particular relates to a steel for a linear guide rail and a manufacturing method thereof. Background technique [0002] In the manufacturing industry, machinery manufacturing, especially the equipment manufacturing industry, is responsible for the important task of providing equipment for various industries and departments, and is the basis for the development of the national economy. Among them, the machine tool manufacturing industry is the heart of the equipment manufacturing industry. The current development of CNC machine tools has affected the international competitiveness of a country's machine tool production. [0003] Since the machine tool was invented, guideway technology has been one of its core technologies. As the precision and strength of modern enterprise machining production are getting higher and higher, how to reduce the impact of impact loads at high spee...

AI Technical Summary

Problems solved by technology

[0005] (2) In addition, non-metallic inclusions in steel destroy the continuity and uniformity of the metal

During heat treatment, there will be problems such as poor hardenability, large water quenching deformation, and sensitive crack tendency.

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