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Grade 255
USA UNS S32550
Corresponding Standard ASTM A790/A790M-2024
Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
Classification Duplex Stainless Steel
255 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu Mo N
Minimum Value - - - - - 24 4.5 1.5 2.9 0.1
Maximum Value 0.04 1 1.5 0.04 0.03 27 6.5 2.5 3.9 0.25
255 Mechanical Properties
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
≥760 ≥550 ≥15 HBW: ≤297
HRC: ≤31
1 Approximate Comparison Table Austenitic-Ferritic Stainless Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade
03Cr25Ni6Mo3Cu2N S25554 329J4L SUS 329J4L STS 329J4L 255 S32550 X2CrNiMoCuN 25-6-3 X2CrNiMoCuN 25-6-3 1.4507 X2CrNiMoCuN 25-6-3 X2CrNiMoCuN 25-6-3 1.4507
2 Approximate Comparison Table Austenitic-Ferritic Stainless Steel
China United States International Organization for Standardization European Standard
ISC UNS ISO Numerical Grade Numerical Grade
S25554 S32550 X3CrNiMoCuN26-6-3-2 4507-325-50-X 1.4507
255 Corresponding Standards(Same grade name, different standards)
1 ASTM A959-2004
255 S32550
2 GB /T 3190-2008
255 2A25
3 ASTM A240/240M-2018
255 S32550
4 ASTM A554-2016
255 S32550
5 ASTM A240/A240M-2020
255 S32550
6 ASTM A959-2019
255 S32550
7 ASTM A789/A789M-2024
255 S32550
8 ASTM A790/A790M-2024
255 S32550

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