X1CrNiMoCuN 20-18-7 1.4547 - EN 10217-7-2021

Grade	X1CrNiMoCuN 20-18-7
European Standard Steel Grade	1.4547
Corresponding Standard	EN 10217-7-2021 Welded Steel Tubes for Pressure Purposes - Technical Delivery Conditions - Part 7: Stainless Steel Tubes
Classification	Austenitic Stainless Steel

X1CrNiMoCuN 20-18-7 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	N
Minimum Value	-	-	-	-	-	19.5	17.5	0.5	6	0.18
Maximum Value	0.02	0.7	1	0.03	0.01	20.5	18.5	1	7	0.25

X1CrNiMoCuN 20-18-7 Mechanical Properties

wall thickness T mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
T≤60	Solution annealing (+AT)	650~850	≥300	Rp1.0 ≥340	≥35(l) ≥30(t)	室温 ≥100(l)；≥60(t) -196°C ≥60(t)

• l=longitudinal；t=transverse

• Solution annealing temperature: 1180-1230°C, rapid cooling in water and air. Resistant to intergranular corrosion

1 Approximate Comparison Table Austenitic Stainless Steel

China		Japan	United States		International Organization for Standardization	European Standard		Sweden
GB	ISC	JIS	ASTM	UNS	ISO	EN	Numerical Grade	SS
015Cr20Ni18Mo6CuN	S31252	SUS 312L	S31254	S31254	X1CrNiMoN 20-18-7 X1CrNiMoCuN20-18-7	X1CrNiMoCuN 20-18-7	1.4547	254SMO

2 Approximate Comparison Table Austenitic Stainless Steel

X1CrNiMoCuN20-18-7 Corresponding Standards(Same grade name, different standards)

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