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Grade TP 347
USA UNS S34700
Corresponding Standard ASTM A376/A376M-2019
Seamless Austenitic Steel Pipe for High-Temperature Service
Classification Austenitic Stainless Steel
TP 347 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Nb More
Minimum Value - - - - - 17 9 - 10C≤Nb(Cb)≤1.10
Maximum Value 0.08 0.75 2 0.045 0.03 19 13 1.1
TP 347 Mechanical Properties
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
%
≥515 ≥205 (Longitudinal 35, Transverse 25), min
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
TP347 Corresponding Standards(Same grade name, different standards)
1 YB /T 4323-2013
TP347
2 ASTM A376/A376M-2019
TP 347 S34700
3 ASTM A409/A409M-2019
TP 347 S34700
4 ASTM A632-2019(2025)
TP 347 S34700
5 ASTM A943/A943M-2001(R2019)
TP347 S34700

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