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Grade 635
USA UNS S17600
Corresponding Standard ASTM A959-2004
Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Classification Precipitation-Hardening Stainless Steel
Properties Strength Corrosion Resistance
635 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Ti Al
Minimum Value - - - - - 16 6 0.4 -
Maximum Value 0.08 1 1 0.04 0.03 17.5 7.5 1.2 0.4
Approximate Comparison Table Precipitation Hardening Heat-Resistant Steel
China United States
GB ISC ASTM UNS
06Cr17Ni7AlTi
GB/T 20878-2024 		S51778 635
ASTM A959 		S17600
635 Corresponding Standards(Same grade name, different standards)
1 ASTM A959-2004
635 S17600
2 ASTM A564/A564M-2019(a)
635 S17600
3 ASTM A693-2013
635 S17600
4 ASTM A959-2019
635 S17600

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