37Mn - GB /T 18248-2021 - H2ABC

中文版

Grade	37Mn
Corresponding Standard	GB /T 18248-2021 Seamless Steel Tubes for Gas Cylinder
Classification	Carbon Steel

37Mn Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Al ^ⓑ	More
Minimum Value	0.34	0.1	1.35	-	-	-	-	-	0.02	P+S≤0.025；V+Nb+Ti+B+Zr≤0.15ⓐ
Maximum Value	0.38	0.35	1.75	0.02	0.01	0.3	0.3	0.2	-	P+S≤0.025；V+Nb+Ti+B+Zr≤0.15ⓐ

37Mn Mechanical Properties

condition	Test Temperature	Mark	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
Steel pipe specimen	Room Temperature	Ⅰ	820~860°C Quenching (Normalizing), Water Cooling + 550~650°C Tempering, Air Cooling	≥750	≥630	≥16	≥27(-50°C)
Steel pipe specimen	Room Temperature	Ⅰ	830~870°C Quenching (Normalizing), Air Cooling	≥700	≥520	≥16	≥27(-20°C)
Steel pipe specimen	Room Temperature	Ⅱ	Normalizing	≥700	≥520	≥20①
Steel pipe specimen	Room Temperature	Ⅱ	Tempering	≥730	≥610	≥14②
Steel Pipe Outer Diameter D＞140mm; t=3*~10, Transverse		Ⅱ	Normalizing				≥20③；≥16④
Steel pipe outer diameter D≤140mm; t=3~10, Longitudinal		Ⅱ	Normalizing				≥40③；≥32④
Steel Pipe Outer Diameter D＞140mm; t=3*~5, Transverse		Ⅱ	Tempering				≥30③；≥24④
Steel Pipe Outer Diameter D＞140mm; t=5~7.5, Transverse		Ⅱ	Tempering				≥35③；≥28④
Steel Pipe Outer Diameter D＞140mm; t=7.5~10, Transverse		Ⅱ	Tempering				≥40③；≥32④
Steel pipe outer diameter D≤140mm; t=3~10, Longitudinal		Ⅱ	Tempering				≥60③；≥48④

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