What is High Speed Steel?

High speed steel (HSS) is a tool steel with high hardness, high wear resistance and high heat resistance, also known as high speed tool steel or front steel, commonly known as white steel. High speed steel was created by FW Taylor and M. White in the United States in 1898.

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In 1898, TaylorF.W., An American mechanical and management engineer, and WhiteM. At that time, the composition of the high-speed steel they determined was C-0.67%, W-18.91%, Cr-5.47%, Mn-0.11%, V-0.29%, and F-balance, which were very close to the later W18Cr4V composition. High-speed steel cutting tools can cut steel at a speed of 30m / min. Its efficiency is several times higher than that of carbon tool steel and alloy tool steel used in the past, and it has won huge economic benefits for the US machinery industry at that time.

The thermoplasticity of W18Cr4V high-speed steel is not good. Due to the need of hot rolling process of twist drill, W6Mo5Cr4V2 high-speed steel was later developed. In addition, there is W9Mo3Cr4V. The cutting performance and mechanical properties of these three high-speed steels are similar and are called general-purpose.

After the middle of the 20th century, science and technology developed rapidly, and various difficult-to-machine materials continued to emerge. The performance of general high-speed steels was no longer used. Therefore, high-performance high-speed steels and powder metallurgy high-speed steels appeared one after another, and the performance of high-speed steel tool materials was obtained Greatly improved.

High speed steel

High-speed steel is a complex

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High-speed steel packaging

Delivery in bundles, bundled with iron wire, and marked with the furnace number, specifications and other marks. However, anti-rust oil should be applied to cold-rolled steel and wrapped with moisture-proof paper, and silver bright steel should also be boxed.

High-speed steel inspection

The inspection of carbide unevenness of high-speed steel is related to the corrosion time of the specimen. Relevant standards only propose that corrosion should be appropriate and not over-corrosion, which is often overlooked. Practice has confirmed that if over corrosion occurs, the carbides will be blackened to show a false phase with improved unevenness, and the high-speed steel with poor quality may be misjudged as a high-quality steel, which is particularly important.