8. Characteristics and uses of major stainless steel types
304: As a widely used steel, it has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, good hot workability such as stamping and bending, no heat treatment hardening, no magnetism, and the temperature is minus 193 degrees. 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: As a low-carbon 304 steel, under normal conditions, the corrosion resistance is similar to that of 304, but after welding and after stress relief, it is resistant to intergranular corrosion and can be maintained well without heat treatment. Corrosion resistance is generally used at 400 degrees.
Uses: petrochemical industry, building materials.
321 added Ti element in 304 steel to prevent intergranular corrosion, suitable for positive 430 to 900 degrees, non-magnetic;
Uses: Automotive exhaust, heat exchangers, containers, etc., which are not heat treated after welding, are not suitable for making food processing equipment due to the addition of Ti.
316 low carbon, adding MO element, so his corrosion resistance and atmospheric corrosion resistance and high temperature strength performance is particularly good, can be used under harsh conditions, suitable for use below 900 degrees, non-magnetic.
Uses: Equipment used in seawater, chemical, dye, paper, acetic acid, fertilizer and other production equipment, food industry and coastal facilities, products with special requirements against intergranular corrosion.
309S/310S two materials, nickel and chromium content is relatively high, while increasing the Si content, making it resistant to high temperature and corrosion, which 309S can withstand repeated heating below 980, 310S use temperature reached 1200 degrees, continuous use The temperature can be 1150 degrees and is non-magnetic.
Uses: The key parts of the device suitable for high-temperature furnace, drying equipment, furnace materials, aviation, petrochemical and power.
The 200 series is similar to the 304 cheap economy.
Uses: food processing utensils, kitchen equipment, food processing equipment, filters, milk cans, consumer durables, washing machine parts, water heaters, steel furniture, architectural decoration, decoration. In terms of fatigue resistance, 201 has a high hardness, and the toughness is not as good as 304, or the fatigue resistance of 304 is better.