30CrMo - GB /T 18248-2021

Grade	30CrMo
Corresponding Standard	GB /T 18248-2021 Seamless steel tubes for gas cylinder
Classification	Alloy Steel

30CrMo Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	More
Minimum Value	0.26	0.17	0.4	-	-	0.8	-	-	0.15	P+S≤0.025；V+Nb+Ti+B+Zr≤0.15ⓐ
Maximum Value	0.33	0.37	0.7	0.02	0.01	1.1	0.3	0.2	0.25	P+S≤0.025；V+Nb+Ti+B+Zr≤0.15ⓐ

30CrMo 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	860~900°C Quenching (Normalizing), Water, Oil Cooling + 490~590°C Tempering, Water, Oil Cooling	≥930	≥785	≥12	≥27(-50°C)
Steel pipe specimen	Room Temperature	Ⅱ	Tempering	≥800	≥680	≥14②
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

1 Approximate Comparison Table structural alloy steel

2 Approximate Comparison Table

China		Japan	International Organization for Standardization	European Standard
GB	ISC	JIS	ISO	EN	Numerical Grade
30CrMo	A30302	SCM425 SCM425H	25CrMo4	25CrMo4	1.7218

3 Approximate Comparison Table structural alloy steel

China	Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	Sweden	United Kingdom
GB	JIS	SAE	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
30CrMo	SCM420 SCM430	4130	25CrMo4	25CrMo4	25CD4	25CrMo4	1.7218	20KHM 30KHM 30KHMA	2225	708A25 708M25 CFS10

4 Approximate Comparison Table structural alloy steel

30CrMo Corresponding Standards(Same grade name, different standards)

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