High-toughness, high-wear-resistant high-speed steel and its processing technology and cutting tools using the technology

Abstract

The invention belongs to the technical field of metal materials, and in particular relates to a high-toughness and high-wear-resistance high-speed steel, its processing technology and a cutting tool using the technology. It solves technical problems such as unreasonable design of the prior art. The high-toughness and high-wear-resistant high-speed steel includes the following components in parts by mass: C: 0.97‑1.06, Si: 0.20‑0.55, Mn: 0.20‑0.50, P: ≤0.03, S: ≤0.015, Cr: 3.80‑4.40 , W: 2.30‑2.45, Mo: 7.60‑7.95, V: 1.95‑2.10, Co: 2.85‑3.50, and the rest is Fe; a processing technology, including A, billet preparation, B, forging, C, steel rolling, D, Cold drawing and E, heat treatment; a tool. The invention has the advantages of good hot working performance and cold working performance, low decarburization sensitivity, good cutting performance and long service life.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a high-toughness and high-wear-resistance high-speed steel, its processing technology and a cutting tool using the technology. Background technique [0002] The birth of high-speed steel has a history of 100 years. People have carried out a lot of fruitful work in alloying, steel type, production process, heat treatment, performance and microstructure. It can be said that it has reached a mature stage. After the middle of the 20th century, the world's science and technology have developed rapidly, as is the most important cutting technology in the machinery manufacturing industry. Many superhard tool materials such as TiC-based cemented carbide, coated cemented carbide, ceramics and cermets, cubic boron nitride, polycrystalline diamond, etc. continue to appear. It cannot be compared with it. However, the toughness and tool formability of high-speed steel are...

AI Technical Summary

Problems solved by technology

[0004] 1. Poor thermal processing performance, W 2 Mo 9 Cr 4 V 2 The thermal conductivity is small, the heating range is narrow, overheating, overburning and cracking often occur, and the billet-to-billet yield fluctuates in the range of 72-76%, that is to say, the yield is low;

[0005] 2. High decarburization sensitivity, for example, 40mm square billet rolling Φ8mm straight strip, W 2 Mo 9 Cr 4 V 2 The decarburization layer fluctuates at 3%D~4%D (0.24~0.32mm);

[0006] 3. Poor cold working performance and poor cold drawing performance: W 2 Mo 9 Cr 4 V 2 Steel due to residual 1-3% M in steel 2 C undecomposed primary rod-shaped carbides, the drawing process is unstable after annealing, and fractures often occur, which reduces the yield;

[0007] 4. Existing pairs include W 2 Mo 9 Cr 4 V 2 The high-speed steel produced by the production and processing technology of the high-speed steel included in the high-speed steel has poor thermal processing performance and cold processing performance, and is highly sensitive to decarburization, and the process is relatively cumbersome, which cannot meet the production requirements;

[0008] 5. The cutting performance of the high-speed steel tool made by the existing production process is poor and the service life is short