Low-temperature seamless steel pipe standard

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Low-temperature seamless steel pipe standard

Standard:
GB / T 18984-2003

Uses:
Applicable -45 ~ -100 ℃ at low temperature pressure vessels and low temperature heat exchanger pipe.

Main production steel grade:
09DG, 16MnDG

Mechanical behavior:

Grade	Rm (MPa)	ReL (MPa)	A (%)	Impact test
Grade	Rm (MPa)	ReL (MPa)	A (%)	T ( ° C )	Kv (J)
16MnDG	490 ~ 665	≥ 315	≥ 30	-45	≥ 34
10MnDG	400	≥ 240	≥ 35	-45	≥ 34
09D	385	≥ 240	≥ 35	-45	≥ 47
09Mn2VDG	450	≥ 300	≥ 30	-70	≥ 47

chemical composition:

Grade	C	Si	Mn	P	S	V
16MnDG	0.12 ~ 0.20	0.20 ~ 0.55	1.20 ~ 1.60	≤0.025	≤0.025	≤0.03
10MnDG	≤0.13	0.17 ~ 0.37	≤1.35	≤0.025	≤0.025	≤0.07
09D	≤0.12	0.17 ~ 0.37	0.95 ~ 1.35	≤0.025	≤0.025	≤0.07
09Mn2VDG	≤0.12	0.17 ~ 0.37	≤1.85	≤0.025	≤0.025	≤0.12

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