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255       ESPECIFICAÇÕES TÉCNICAS

Alloy 255 is a 25% chromium super duplex stainless steel. Alloy 255 contains a copper addition which provides it with greater resistance to sulfuric acid than other super duplex grades. Because of its duplex structure alloy 255 also offers excellent strength characteristics and resistance to chloride ion stress corrosion cracking.

Chemical Composition, %

 

 

Ni

Cr

Mo

Mn

Cu

Si

C

N

S

P

Fe

MIN

4.5

24

2.9

-

1.5

-

-

0.1

-

-

-

MAX

6.5

27

3.9

1.5

2.5

1

0.04

0.25

0.03

0.04

balance

 

Specifications


UNS: S32550 W. Nr./EN: 1.4507 ASTM: A 240, A 479 ASME: SA-240, SA-479 NACE: MR0175/ISO 15156



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