A kind of steel s48c for construction machinery slewing bearing and its production method

Abstract

The invention discloses a steel S48C for construction machinery slewing bearings and a preparation method thereof. The chemical composition mass percentages are: C: 0.49%-0.51%, Si: 0.30%-0.35%, Mn: 0.85%-0.90%, Cr: 0.23%‑0.25%, Cu≤0.20%, Ni: ≤0.10%, Mo: 0.03%~0.05%, P≤0.012%, S≤0.002%, [H]≤0.00015%, [O]≤0.0015%, [ N]≤0.0050%, the balance is Fe. 0.03%~0.05%Mo and 0.20%~0.25%Cr elements are added to the mass percentage of the chemical composition to improve the hardenability of the steel. At the same time, the strength of the steel is improved while maintaining its plasticity and toughness at a level comparable to that of traditional S48C. and wear resistance; reduce the content of harmful residual elements such as P, S, and Cu as much as possible, and strictly control the content of harmful gases to [H]≤0.00015%, [O]≤0.0015%, [N]≤0.0050%; Non-metallic inclusions dA ≤ 0.15%, dB ≤ 0.05%, dC coarse ≤ 0.10%. The critical hardening diameter of the slewing bearing produced by the invention can reach more than 45mm. Through the setting of continuous casting process parameters, the present invention can replace hot-rolled round steel with continuous casting round billet, greatly reduces the cost of raw materials, and has remarkable economic benefits.

Description

A kind of steel S48C for slewing bearing of construction machinery and its production method Technical field: The present invention relates to high-quality carbon structural steel in the iron and steel industry, be specifically related to a kind of construction machinery slewing bearing steel S48C and its production method. Background technology: Slewing bearing, also known as slewing bearing, is a large bearing that can withstand comprehensive loads, Large axial and radial loads and overturning moments. The slewing bearing is widely used in the industry and is called "the key of the machine". "Joint", which is required for machines that need to perform relative rotary motion between two objects and simultaneously bear axial force, radial force and overturning moment. important transmission parts. With the rapid development of mechanical torque, slewing bearings are widely used in marine equipment, construction machinery, light industrial machinery, metallurgy Ma...

AI Technical Summary

Problems solved by technology

However, more and more construction machinery requires slewing bearings to have more uniform performance, which requires improving the hardenability of raw materials (critical hardening diameter DI ≥ 1.7 inches, so that the slewing bearings are completely hardened), and the traditional S48C material has been cannot meet this requirement, thus limiting its use

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