Stainless Steel

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WHAT IS “STAINLESS” STEEL?

By “stainless” is generally meant a large group of types of steel which contain at least 12% chromium (Cr) and often additions of other alloy substances, for example, nickel (Ni) and molybdenum (Mo). The types of steel that BULTEN STAINLESS generally uses can be divided into the following main groups in accordance with their inner construction or structure: stainless and acid-resistant – the most secure protection


1. Ferritic steel
(partially temperable)
Cr = 12 – 30%
Mo, if used = 1.3 – 2.5%
C = max 0.08%

2. Martensitic steel
(temperable)
Cr = 12 – 18%
Mo, if used 1.3 – 2.0%
C = max 0.25%

3. Austenitic steel
(not temperable)
Cr = 16.5 – 26%
Ni = 7 – 25%
Mo, if used 1.5 – 4.5%
C = max 0.07%

4. Ferritic-austenitic steel
(partially temperable)
Cr = 17 – 27%
Ni = 4 – 6%
Mo, if used = 1.3 – 2.0%
C = max 0.10%