Are SS and AISI steels the same

AISI 316 | AISI 316L

AISI 316 | AISI 316L

AISI 316 and AISI 316L are the international names for the following material grades:

1.4401 - X5CrNiMo17-12-2 (AISI 316)

1.4404 - X2CrNiMo17-12-2 (AISI 316L)

1.4435 - X2CrNiMo18-14-3 (AISI 316L)


AISI 316 and AISI 316L describes stainless, austenitic chromium-nickel-molybdenum steels that have good resistance in non-oxidizing acids and media containing chlorine. Because of their chemical composition, material 316 and material 316L are inherently corrosion-resistant metal alloys.

AISI 316L differs from AISI 316 in that it has a lower carbon content. In this case, the “L” stands for “low carbon”.

The materials 1.4401 and 1.4404, which belong to the V4A group, are easy to machine and weld. With the addition of 2-2.5% molybdenum, both grades show good corrosion resistance even in the presence of chlorides. The main areas of application of these AISI standards can be found in the construction, chemical and pharmaceutical industries. Use in the low temperature range is possible, as is application up to 550 ° C.

The material quality 1.4435, also called stainless steel 316L, is described as an amagnetic quality. The delta ferrite content is shown to be a maximum of 0.5%. It can be used in accordance with the Pressure Equipment Directive 97/23 EG. The areas of application for this material include: in the petroleum / petrochemical or optical industries.


Chemical composition

1.4401
X5CrNiMo17-12-2
C.SiMnP.S.CrMonNiN
min.     16,52,010,0   
Max.0,071,02,00,0450,01518,52,513,00,11
1.4404
X2CrNiMo17-12-2
C.SiMnP.S.CrMonNiN
min.     16,52,010,0   
Max.0,071,02,00,0450,01518,52,513,00,11
1.4435
X2CrNiMo18-14-3
C.SiMnP.S.CrMonNiN
min.     17,02,512,5   
Max.0,031,02,00,0450,0319,03,015,0 0,11


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