Characteristics and uses of major stainless steel types

- Apr 11, 2018 -

304: As a widely used steel, with good corrosion resistance, heat resistance, low temperature strength and mechanical properties, stamping, bending and other hot workability, no heat treatment hardening, no magnetic, the use of temperature below 193 degrees to It is 800 degrees.


Uses: tableware, kitchen utensils, water heaters, boilers, auto parts, medical equipment, food machinery, storage wine, pressure vessels (chemical machinery, chemical equipment).

 

304L is a low-carbon 304 steel. Under normal conditions, the corrosion resistance is similar to that of 304. However, after welding and stress relieving, it has good resistance to intergranular corrosion and can maintain good quality even without heat treatment. Corrosion resistance, generally used at 400 degrees,


Uses: petrochemical industry, building materials.

 

321 Adds Ti element in 304 steel to prevent intergranular corrosion. It is suitable for 430 to 900 degrees and no magnetism.


Uses: Automotive exhaust, heat exchangers, containers and other products that are not heat-treated after welding. Due to the addition of Ti, it is not suitable to make food processing equipment.

316 low-carbon, added MO element, so his corrosion resistance and atmospheric corrosion resistance and high temperature strength properties are particularly good, can be used under harsh conditions, suitable for use under 900 degrees, non-magnetic.


Uses: Equipment used in seawater, chemicals, dyes, paper, acetic acid, fertilizers and other production equipment, food industry and coastal area facilities, products with special requirements against intercrystalline corrosion.

 

309S/310S These two materials, nickel and chromium content is relatively high, while increasing the Si content, making it have high temperature and corrosion resistance, which 309S can withstand repeated heating under 980, 310S use temperature reaches 1200 degrees, continuous use The temperature can be 1150 degrees, non-magnetic.


Uses: Suitable for high-temperature electric furnace equipment, drying equipment and other key parts, furnace materials, aviation, petrochemical, electric power and so on.

 

The 200 series is similar to 304 cheap economical.


Uses: food processing utensils, kitchen equipment, food processing equipment, filters, milk cans, durable consumer goods, washing machine parts, water heaters, steel furniture, building decoration, decoration. In terms of fatigue resistance, the hardness of 201 is higher, the toughness is not as good as 304, or the fatigue resistance of 304 is better.

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