We know ASTM tool steel start from letter, such as H12, A2, D2, O2, S7, L2, F2 and P20 etc, do you know how to classify them? What’s the difference among them?1: Hot work tool steels, Identification H:1): Types H10 to H19 are characterized by a controlled chromium content along with other alloying e

ASTM 420 is a martensitic stainless steel defined by ASTM A276/A276M, it can be equivalent with 2Cr13 3Cr13 and 4Cr13 according to different carbon content. After reading this artical, you can choose the different equivalent steel based on different usage. This artical also tell you the chemical composition, mechanical properties and application of ASTM 420 stainless steel.

Stainless steel is a steel alloy that contains a minimum chromium content of 10.5%. The chromium reacts with the oxygen in the air and forms a protective layer that makes stainless steel highly resistant to corrosion and rust. At the moment, there are over 150 varieties of stainless steel in the market.

Mild steel: carbon content less than 0.25%. because of its lower strength and hardness, it is called mild steel. Low carbon steel is easy to process, including forging, welding and cutting, so it is often used in the manufacture of chains, rivets, bolts, shafts and so on.

The main difference between 304 and 316 is in terms of corrosion resistance and usage scope. In terms of content, the nickel content of 304 is generally 8%, while that of 316 is 10%, and 316 also contains 2% molybdenum element. So in terms of corrosion resistance, 316 is stronger than 304, which is why in some public facilities or coastal cities, 316 is the most common product.And 316 stainless steel contains Mo, which has better corrosion resistance than 304 stainless steel in high-temperature environments. Therefore, engineers generally choose components made of 316 material in high-temperature environments.

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