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Grade A320 B8C Class 1
USA UNS S34700
Other Names
Corresponding Standard ASTM A320/A320M-2021
Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
Classification Austenitic Stainless Steel
Properties Corrosion Resistance
A320 B8C Class 1 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni More
Minimum Value - - - - - 17 9 Nb+Ta：10C~1.10
Maximum Value 0.08 1 2 0.045 0.03 19 12
A320 B8C Class 1 Mechanical Properties
conditino Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
All Diameters Carbide Solid Solution Treatment ≥515 ≥205 ≥30 ≥50 ≤223
1 Approximate Comparison Table
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS BS EN/BS
06Cr18Ni11Nb S34778 347 SUS 347 STS 347 347 S34700 X6CrNiNb 18-10 X6CrNiNb 18-10
(X10CrNiNb18-9) 		1.4550 Z6CNNb 18-10 X6CrNiNb 18-10 1.4550 08Х18Н12Б 2338 347S17
347S31
2 Approximate Comparison Table
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS BS EN/BS
06Cr18Ni11Nb
(0Cr18Ni11Nb) 		S34778 347 SUS 347 STS 347 347 S34700 X6CrNiNb 18-10 X6CrNiNb 18-10
(X10CrNiNb18-9) 		1.4550 Z6CNNb 18-10 X6CrNiNb 18-10 1.4550 08Х18Н12Б 2338 347S17
347S31
A320B8CClass1 Corresponding Standards(Same grade name, different standards)
1 ASTM A320/A320M-2018
A320 B8C Class 1 S34700 347
2 ASTM A320/A320M-2021
A320 B8C Class 1 S34700 347

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