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Grade X7CrNiNb18-10
ISO Numeric Designation 4912-347-09-I
Old Grade
Corresponding Standard ISO 4955-2016
Heat-Resistant Steels
Classification Alloy Steel
Properties Corrosion Resistance
X7CrNiNb18-10 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni More
Minimum Value 0.04 - - - - 17 9 Nb：10×C ~ 1.20 *
Maximum Value 0.1 1 2 0.045 0.03 19 12
X7CrNiNb18-10 Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
flat products, 0.5≤t＜3 Solid Solution Annealing (+AT) 510~710 ≥205 ≥28 ≤192
flat products, 3≤t≤75 Solid Solution Annealing (+AT) 510~710 ≥205 ≥30 ≤192
Section steel, 5 ≤ d ≤ 160 Solid Solution Annealing (+AT) 510~710 ≥205 ≥30 ≤192
Bars and Profiles, 1.5≤d≤25 Solid Solution Annealing (+AT) 510~710 ≥205 ≥30 ≤192
Forgings, d≤100 Solid Solution Annealing (+AT) 510~710 ≥205 ≥30 ≤192
Approximate Comparison Table Austenitic Stainless Steel
China Japan United States International Organization for Standardization France European Standard
GB ISC JIS ASTM/AISI UNS ISO Numerical Grade NF EN/NF EN Numerical Grade
07Cr18Ni11Nb
(1Cr19Ni11Nb) 		S34779 SUS347H 347H S34709 X7CrNiNb18-10 4912-347-09-I Z2CND17-11
Z2CND18-13
Z8CNNb18-10 		X7CrNiNb18-10 1.4912
X7CrNiNb18-10 Corresponding Standards(Same grade name, different standards)
1 EN 10088-1-2005
X7CrNiNb 18-10 1.4912
2 ISO 4955-2005
X7CrNiNb18-10 (12)
3 ISO TS 15510-2003
X7CrNiNb18-10
4 ISO 9327(-5)-1999
X7CrNiNb18-10 (F51)
5 ISO 15510-2014
X7CrNiNb18-10 4912-347-09-I
6 ISO 4955-2016
X7CrNiNb18-10 4912-347-09-I (12)
7 EN 10222-5-2017
X7CrNiNb18-10 1.4912
8 NF EN 10088-1-2005
X7CrNiNb18-10 1.4912

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