30CrMnSiA - GB /T 18248-2021

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

30CrMnSiA Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	More
Minimum Value	0.28	0.9	0.8	-	-	0.8	-	-	-	P+S≤0.03
Maximum Value	0.34	1.2	1.1	0.02	0.02	1.1	0.3	0.2	0.1	P+S≤0.03

30CrMnSiA Mechanical Properties

condition	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	Ⅰ	860~900°C Quenching (Normalizing), Oil Cooling + 470~570°C Tempering, Water, Oil Cooling	≥1080	≥930	≥12	≥27
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

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

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