Non-quenched-tempered naturally pre-hardened easy-cutting forging die steel

Abstract

The invention discloses a non-quenched-tempered naturally pre-hardened easy-cutting forging die steel which is characterized in that the steel is composed of the components of, by mass, 0.2-0.25% of C, 0.25-0.30% of Si, 1.6-1.8% of Mn, no more than 0.005% S, no more than 0.008% of P, 1.6-2.0% of Cr, 0.22-0.32% of Mo, 0.13-0.18% of Cu, 0.9-1.3% of Ni, and balance of Fe and unavoidable impurities. The steel provided by the invention has same functions as original 718 or 2738 die steel. According to the invention, heat treatment is eliminated, and an obtained steel material does not need cutting. A steel material blank can be directly blanked, and natural cooling can be carried out after forging, such that HRC hardness of 33-36 can be achieved. Therefore, the non-quenched-tempered naturally pre-hardened easy-cutting forging die steel provided by the invention has the advantages of short processing period, low energy consumption, reduced raw material wasting, and the like.

Description

technical field [0001] The invention belongs to the steelmaking technology, and in particular relates to a non-quenched and tempered naturally prehardened easy-cut forging die steel. Background technique [0002] 718 or 2738 mold steel is a mold material suitable for making plastic molds and die-casting low-melting point metals. [0003] 718 or 2738 mold steel contains the following components in mass percentage: carbon C0.38-0.42%, silicon Si0.2-0.3%, manganese Mn1.3-1.5%, sulfur S≤0.020%, phosphorus P≤0.002%, Chromium Cr1.9-2.0%, molybdenum Mo0.2-0.3%, nickel Ni1.1-1.6%. [0004] The 718 or 2738 mold steel of the prior art has the following defects: 1. During the processing, forging or tempering is required, followed by quenching and tempering heat treatment and then tempering, so as to eliminate the stress to meet the requirements of use, so the processing cycle is long and the energy consumption is large , It is very easy to cause waste of raw materials. 2. The cuttin...

AI Technical Summary

Problems solved by technology

[0004] The 718 or 2738 mold steels of the prior art have the following defects: 1. During the processing, forging or tempering is required, followed by quenching and tempering heat treatment and then tempering, so as to eliminate the stress to meet the requirements of use, so the processing cycle is long and the energy consumption is large , it is very easy to cause waste of raw materials

2. The cutting performance is not ideal and cannot meet the cutting performance requirements during use