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Home Material ASTM A789/A789M-2024
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USA UNS S31200
Corresponding Standard ASTM A789/A789M-2024
Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
Classification Duplex Stainless Steel
Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo N
Minimum Value - - - - - 24 5.5 1.2 0.14
Maximum Value 0.03 1 2 0.045 0.03 26 6.5 2 0.2
Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
Tube Solution treatment at 1050~1100°C, rapid water quenching ≥690 ≥450 ≥25 HBW: ≤280
HRC: ≤29
HV: ≤280*
Approximate Comparison Table Austenitic-Ferritic Stainless Steel
China United States International Organization for Standardization Germany France European Standard
GB ISC UNS ISO Numerical Grade DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade
022Cr25Ni6Mo2N S22553 S31200 X3CrNiMoN 27-5-2 4460-312-00-I X3CrNiMoN 27-5-2 1.4460 X3CrNiMoN 27-5-2 X3CrNiMoN 27-5-2 1.4460

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