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Where is the difference between stainless steel 409,410,420,430?

Feb 20 2023

410, 420, and 430 are 400 -series stainless iron, which belongs to nickel -saving stainless steel. The nickel content is basically zero.


Different one: carbon -containing, different chromium volume

409: 0.22%carbon content, CR: 11%.

The molecular formulas of 410, 420, and 430 are 1CR13, 2CR13, and 1CR17;

The first place represents the carbon content 1 represents the carbon content of 0.08%-0.15%, and the 2 represents the carbon content of 0.15%-0.25%;

CR13 represents chromium content of 12%-14%, and CR17 represents chromium content of 15%-17%.

Different two: Different organizational status

(1) 410, 420 are mate -generated stainless steel

(2) 430, 409 is iron stainless steel


Stainless steel is often divided into tissue states: martensitic stainless steel, ferrite stainless steel, Austenite stainless steel. In addition, it can be divided into chromium stainless steel, chromium nickel stainless steel, and chromium manganese nitrogen stainless steel.

1. Ferritic stainless steel: 12%to 30%of chromium containing chromium. Its corrosion resistance, toughness, and weldability are increased with the increase of chromium content. The stress corrosion resistance of chloride resistance is better than other types of stainless steel.

There are CRL7, CR17MO2TI, CR25, CR25MO3TI, CR28, etc. Because of the high chromium content of iron stainless steel, the corrosion resistance and antioxidant performance are better, but the mechanical properties and process performance are poor. It is mostly used for the use of acid -resistant acid -resistant structures and anti -oxidant steel.

This type of steel can resist the corrosion of atmosphere, nitric acid and saline solution, and has the characteristics of high temperature antioxidant performance, small thermal expansion coefficients, etc. It is used for nitric acid and food factory equipment. Essence


2. Austenite stainless steel: Chromium -containing is greater than 18%, and it also contains about 8%nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good comprehensive performance, which can resist multiple media corrosion. The commonly used plates of Austenite stainless steel include 1CR18NI9, 0CR19NI9 and so on. The WC <0.08%of the 0CR19NI9 steel, the bid for the steel number is "0".

This type of steel contains a large amount of Ni and CR, which makes the steel in the auscular state at room temperature.

This type of steel has good plasticity, toughness, welding, and corrosion resistance. It has good corrosion resistance in the oxidation and reducing medium. Nitric acid equipment parts. The austenite stainless steel is generally soluble, and the steel will be heated to 1050 ~ 1150 ° C, and then water is cold to obtain a single -phase Austenite tissue.


3. Austenitic-ferrite bilateral stainless steel: also has the advantages of Austenitic and ferrite stainless steel, and has super plasticity.

The austenitic and ferrite tissue each account for about half of the stainless steel. In the case of lower C, the CR content is 18%28%, and the Ni content is 3%10%. Some steel also contain alloy elements such as MO, CU, SI, NB, Ti, N, etc.

This type of steel has the characteristics of Austenite and ferrite stainless steel. Compared with ferrite, the plasticity and toughness are higher, the no room temperature is crispy, and the corrosion resistance and welding performance of the crystal resistance are significantly improved. The 475 ℃ brittleness of the stainless steel and the high thermal conductivity, which has the characteristics of ultra -plasticity.

Compared with the austenitic stainless steel, high strength and crystal corrosion and chloride stress corrosion have significantly improved. Two -phase stainless steel has excellent pore resistance and is also a kind of nickel -saving stainless steel.


4. martensitic stainless steel: high strength, but poor plasticity and weldability.

The commonly used grades of matewars stainless steel include 1CR13, 3CR13, etc. Because of high carbon content, it has high strength, hardness and abrasion resistance, but the corrosion resistance is slightly poor. Some parts are required, such as spring, turbine blades, water pressure machine valves, etc. These steels are used after quenching and recovery.

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