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Grade X7CrNi18-9
ISO Numeric Designation 4948-304-09-I
Old Grade
Corresponding Standard ISO 4955-2016
Heat-resistant Steels
Classification Alloy Steel
Properties Corrosion Resistance
X7CrNi18-9 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni
Minimum Value 0.04 - - - - 17 8
Maximum Value 0.1 1 2 0.045 0.03 19 11
X7CrNi18-9 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) 500~700 ≥195 ≥37 ≤192
flat products, 3≤t≤75 Solid Solution Annealing (+AT) 500~700 ≥195 ≥40 ≤192
Section steel, 5 ≤ d ≤ 160 Solid Solution Annealing (+AT) 500~700 ≥195 ≥40 ≤192
Bars and Profiles, 1.5≤d≤25 Solid Solution Annealing (+AT) 500~700 ≥195 ≥40 ≤192
Forgings, d≤100 Solid Solution Annealing (+AT) 500~700 ≥195 ≥40 ≤192
1 Approximate Comparison Table Austenitic Stainless Steel
China Japan United States International Organization for Standardization Germany European Standard
GB ISC JIS AISI UNS ISO DIN EN/DIN W-Nr. EN Numerical Grade
07Cr19Ni10 S30409 SUS 304H 304H S30409 X6CrNi 18-10
X7CrNi 18-9 		X6CrNi18-10 1.4948 X6CrNi18-10 1.4948
2 Approximate Comparison Table
Japan United States International Organization for Standardization France European Standard Russia
JIS ASTM UNS ISO NF EN/NF EN Numerical Grade GOST
SUS304H 304H S30409 X7CrNi18-9 Z6CN18-09 X6CrNi18-10 1.4948 08KH18N10
X7CrNi18-9 Corresponding Standards(Same grade name, different standards)
1 ISO 4955-2005
X7CrNi18-9 (10)
2 ISO TS 15510-2003
X7CrNi18-9
3 ISO 9327(-5)-1999
X7CrNi18-9 (F48)
4 ISO 15510-2014
X7CrNi18-9 4948-304-09-I
5 ISO 4955-2016
X7CrNi18-9 4948-304-09-I (10)

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