Pipe for cryogenic device

Cryogenic piping refers to systems that are used in a wide range of industrial applications that require extremely low temperatures, generally around -300°F (150°C) or lower. Due to such low temperatures, cryogenic pipes face unique corrosion and deterioration challenges.

Cyrogenic piping is also referred to as cold piping.

Implement specifications such as ASME SA-333M, GB/T18984. The seamless steel tubes are applied for low temperature pressure vessel pipeline and low temperature heat exchanger pipeline.

Usage	Specification	Steel Grade
Seamless and Welding Nominal Pipe used for Low Temperature	ASME SA -333M	Gr.3, Gr.6, Gr.8 and so on
Seamless Steel Pipe used for Low Temperature Pipeline	GB/T18984	16MnDG, 06Ni3MoDG, 06Ni9MoDG and so on

ASTM A333 (ASME S/A-333) Pipe grades permit low temperature service.

Mechanical requiremnts of ASTM A333 alloy pipe

Grade	Tensile Strength (MPa）	Yield Point (MPa)	Elongation (%)
Grade	Tensile Strength (MPa）	Yield Point (MPa)	Y	X
Grade 3	≥450	≥240	≥30	≥20
Grade 6	≥415	≥240	≥30	≥16.5
Grade 8	≥690	≥515	≥22

Chemical Composition (%) of ASTM A333 steel pipe

Grade	Chemical Composition (%)
Grade	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	V	Al
Grade 3	≤0.19	0.18-0.37	0.31-0.64	≤0.025	≤0.025		3.18-3.82
Grade 6	≤0.30	≥0.10	0.29-1.06	≤0.025	≤0.025
Grade 8	≤0.13	0.13-0.32	≤0.90	≤0.025	≤0.025		8.40-9.60

Products can be ordered in accordance with the client’s requirements.

GB/T18984-2003 standard suitable for -49 to -148 0 F cryogenic pressure vessel piping, and low-temperature heat exchanger tubes seamless steel pipe.

Chemical Compositions(%)

Grade	C	Si	Mn	P(max)	S	Ni	Mo	V
16MnDG	0.12-0.20	0.20-0.55	1.20-1.60	0.025	0.025	-	-	-
10MnDG	<=0.13	0.17-0.37	<=1.35	0.025	0.025	-	-	<=0.07
09DG	<=0.12	0.17-0.37	<=0.95	0.025	0.025	-	-	<=0.07
09Mn2VDG	<=0.12	0.17-0.37	<=1.85	0.025	0.025	-	-	<=0.12
06Ni3MoDG	<=0.08	0.17-0.37	<=0.85	0.025	0.025	2.5-3.7	0.15-0.30	<=0.05

Longitudinal mechanical properties of the steel pipes

Grade	Tensile strength	Lower yield strength（Rcl/Mpa）		Elongation
Grade	Rm/Mpa	W.T.<=16mm	W.T.>16mm	A/%
16MnDG	490-665	>=325	>=315	>=30
10MnDG	>=400	>=240		>=35
09DG	>=385	>=210		>=35
09Mn2VDG	>=450	>=300		>=30
06Ni3MoDG	>=455	>=250		>=30

(Not more than 25 mm) outside diameter and wall thickness of the steel pipe shall conform to GB/T 17395-1998 Table 1 provisions. According to the requirements of the demand side, the supply and demand sides consultation, produce the provisions specifications steel pipe.

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