Stainless steels are a family of iron based alloys that contain a minimum of 10.5% chromium (CR). The presence of chromium creates an invisible surface film that resists oxidation and makes the material passive or corrosion resistant. There are multiple families of stainless steel which are designed for various applications and uses. Stainless grades can be further modified to meet various processing, corrosion, temperature and strength conditions.
Taking 304 and 304L stainless steel plates as an example, they are part of the austenitic family of stainless steel and they are one of the most versatile and widely used varieties of stainless plate. They are a relatively low cost stainless product and used in a variety of applications. 304 grades have excellent low temperature properties and respond well to hardening by cold working. 304 grades have good welding characteristics and post weld annealing is not normally required to restore performance. 304 SS has excellent corrosion resistance in a variety of different media. Typical specifications for 304 and 304L are ASTM A-240, ASME SA -240 and A666.
Chemical and Mechanical Properties of Stainless Steel Plate:
|Typical chemical requirements|
|Carbon, Max %||0.07||0.03||0.03||0.08|
|Manganese, Max %||2||2||2||2|
|Phosphorus, Max %||0.045||0.045||0.045||0.045|
|Sulphur, Max %||0.03||0.03||0.03||0.03|
|Tensile Min||75 ksi||70 ksi||75 ksi||75 ksi|
|Yield Min||30 ksi||25 ksi||25 ksi||30 ksi|
|Hardness Max||95 HRB||95 HRB||95 HRB||95 HRB|