U71Mn - GB /T 2585-2021

Grade	U71Mn
Corresponding Standard	GB /T 2585-2021 Hot-Rolled Steel Rails for Railway
Classification	Alloy Steel

U71Mn Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	Ti	V	Nb	Al	Sn	Sb	More
Minimum Value	0.6	0.15	0.7	-	-	-	-	-	-	-	-	-	-	-	-	Ni+Cu≤0.2；Gu+10Sn≤0.35；Cr+Ni+Mo+Cu≤0.35
Maximum Value	0.8	0.58	1.2	0.025	0.025	0.15	0.1	0.15	0.02	0.025	0.03	0.01	0.004	0.03	0.02	Ni+Cu≤0.2；Gu+10Sn≤0.35；Cr+Ni+Mo+Cu≤0.35

U71Mn Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Elongation or Extension Rate δ %	Hardness HBW
No Heat Treatment	≥880	≥10①	260~300(HBW10/3000)②③

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