Stainless steel for cutter and manufacture method thereof

Abstract

The invention discloses stainless steel for a cutter and a manufacture method thereof. The steel comprises the following chemical components in percentage by weight: C:0.20-0.65, Si:0.10-0.50, Mn:0.10-0.60, P:0.010-0.030, S: 0.005-0.015, Cr: 14-17, Nb: 0.01-0.30, Ti: 0.005-0.025, W: 0.50-1.50, Al: 0.005-0.30 and the balance of Fe and inevitable impurities and also satisfies that the valent weightof Cr is 14.14-17.41, and the valent weight of Ni is 6.30-19.63. The manufacture method comprises the following steps: making steel in an induction furnace, casting ingot moulds, rolling in a reversing mill, cooling in a pile, thermally treating, and the like. A cutter made of the steel does not disintegrate, keeps durable sharpness and is suitable for manufacturing a kitchen cutter, scissors anda surgical knife. The manufacture method has excellent performance, simple production operation, easily controlled product quality and low cost.

Description

Technical field [0001] The invention belongs to the field of stainless steel manufacturing, and specifically relates to a stainless steel for cutting tools and a manufacturing method thereof. Background technique [0002] Stainless steel is not rusty, durable, and beautiful. It is widely used by knife manufacturers to make kitchen knives, scissors and surgical knives. However, the commonly used stainless steel materials have low hardness, unsatisfactory wear resistance, poor blade sharpness and short retention time. With the development of economy and the improvement of people's living standards, people have put forward higher requirements for the performance of cutting tools. Therefore, many people are also actively developing cutting tools. [0003] Before the present invention, the Chinese invention patent specification with the patent number ZL 01126989.8 discloses a copper alloy material suitable for cutting tools, which is composed of Cu, Zn, and Sn, and the composition acco...

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Problems solved by technology

[0004] Among the above technologies, the former literature records that the copper alloy material is based on copper, the production cost is high, and the thermal processing performance is poor. It needs to be manufactured by powder metallurgy method, which has complicated process and low production efficiency.

The stainless steel materials introduced in the latter literature are added with a mass fraction of more than 0.7% C in order to increase the hardness, but practice has proved that adding more than 0.7% C content in stainless steel will become a hypereutectoid steel, which will form coarse brittle eutectic carbides , so that the steel is easy to crack when it is processed, and it is very easy to crack when it is made into a tool; and the Cr content of this material is low, which cannot meet the minimum 12% Cr content required by stainless steel, and its corrosion resistance is poor, easy to rust, and after quenching It also needs to undergo cryogenic treatment at -80°C, the tool has high residual stress, large deformation, and easy cracking, and it is difficult to achieve on-site production