Low-cost high-plasticity alloy steel wire rod for sorbite tool and manufacturing method thereof

The production of low-cost high-plasticity tool steel with controlled composition and processing achieves high hardness and stability, eliminating the need for expensive alloy elements, thereby reducing production costs and enhancing material properties.

CN119640155APending Publication Date: 2025-03-18QINGDAO SPECIAL STEEL CO LTD
6 Cites 0 Cited by

Patent Information

Application Number
CN202411507631.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-28
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

Current tool steel production methods require expensive alloy elements like V and Mo to achieve high hardness and wear resistance, leading to increased production costs and potential issues with material stability and surface quality, especially in achieving the desired 58HRC hardness.

Method used

A low-cost high-plasticity tool steel alloy with a composition of C: 0.55-0.61%, Si: 1.25-1.60%, Mn: 0.60-0.80%, Cr: 0.60-0.80%, Ni: ≤0.35, Cu: ≤0.35, P: ≤0.025, S: ≤0.020, and the rest as Fe and unavoidable impurities, is produced using a process involving steel refining, continuous casting, controlled heating, and controlled rolling and cooling to form a predominantly austenitic structure, eliminating the need for expensive alloy elements and reducing defects.

Benefits of technology

The method achieves a high hardness of 58-61HRC without the need for V and Mo, optimizing the microstructure to enhance plasticity and reduce production costs, while maintaining the necessary mechanical properties and stability, allowing for direct hot-rolled tool steel processing without the need for prior heat treatment.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses an alloy steel wire rod for a low-cost high-plasticity sorbite tool and a manufacturing method of the alloy steel wire rod. The alloy steel wire rod comprises the following chemical components in percentage by mass: 0.55-0.61% of C, 1.25-1.60% of Si, 0.60-0.80% of Mn, 0.60-0.80% of Cr, less than or equal to 0.35% of Ni, less than or equal to 0.35% of Cu, less than or equal to 0.025% of P, less than or equal to 0.020% of S and the balance of Fe and inevitable impurities. The manufacturing method comprises the steps of steel billet smelting, continuous casting, heating, controlled rolling and controlled cooling, wherein a soft reduction process is adopted for continuous casting, the initial rolling temperature is controlled to be 900-980 DEG C, the high-pressure water descaling pressure is larger than or equal to 19 MPa, the final rolling temperature is 780-840 DEG C, the spinning temperature is 780-840 DEG C, and cooling is conducted through an air cooling roller bed. The steel wire rod is free of precious metal and low in cost, the hardness of a finished product reaches 58-61 HRC, and the product requirement is met.
Need to check novelty before this filing date? Find Prior Art