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Grade A320 B8C Class 2
USA UNS S34700
Other Names
Corresponding Standard ASTM A320/A320M-2018
Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
Classification Alloy Steel
A320 B8C Class 2 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
Note: Except as specified, intentional addition of Bi, Se, Te, and Pb is not permitted.
A320 B8C Class 2 Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
d≤20 Carbide Solid Solution Treatment with Strain Hardening ≥860 ≥690 ≥12 ≥35 ≤321
20＜d≤25 Carbide Solid Solution Treatment with Strain Hardening ≥795 ≥550 ≥15 ≥30 ≤321
25＜d≤32 Carbide Solid Solution Treatment with Strain Hardening ≥725 ≥450 ≥20 ≥35 ≤321
32＜d≤40 Carbide Solid Solution Treatment with Strain Hardening ≥690 ≥345 ≥28 ≥45 ≤321
1 Approximate Comparison Table Austenitic Stainless Steel
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 Austenitic Heat-Resistant Steel
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
A320B8CClass2 Corresponding Standards(Same grade name, different standards)
1 ASTM A320/A320M-2018
A320 B8C Class 2 S34700 347
2 ASTM A320/A320M-2021
A320 B8C Class 2 S34700 347

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