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.

In daily life, we often confuse steel and iron as a concept and regard them as the same product. In fact, steel and iron are different products. So, what is the difference between iron and steel? Steel is a general term for iron-carbon alloys with a carbon content of 0.02% to 2.11% by mass.

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.

Steel bars and rebars are both long, straight pieces of steel that are regularly utilized in Construction and other purpose. But they have a few Important key differences. Some of them are listed below: 1、USES: A Rebar is also known as a Reinforcing Bar. Rebars are generally used in reinforced concrete structures. Its main objective is to give concrete more tensile strength, which will strengthen and reinforce the material. Rebar is frequently utilized in the building of concrete buildings such as walls, columns, and foundations.

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.

Common types of heat treating methods include annealing, hardening, quenching, and stress relieving, each of which has its own unique process to produce different results.

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.

The difference in axial and radial mechanical properties of forgings is smaller than that of rolled products. In terms of the degree of transformation, the degree of deformation of the forging is much greater than that of the rolling, which means that the effect of breaking eutectic carbide through forging is better than that of rolling. In terms of processing cost, the cost of forging is much higher than the cost of rolling. Forgings have complete metal flow lines.