ASTM A333 Alloy Steel Pipe for Low-Temperature Service

ASTM A333 (ASME S/A-333) Pipe grades permit low temperature service. This specification covers nominal (average) walled pipe almost exclusively in seamless.

• Seamless steel tubes for low-temperature service
• A333-6 low temperature steel pipe welding
• GB/T18984 Low-temperature heat exchanger tubes
• Welding method of low carbon steel at a low temperature
• Low and medium pressure boiler pipe

Several grades of ferritic steel are included. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse effect on low-temperature impact properties.

A333 pipe is furnished to nine different grades designated by numbers 1, 3, 4, 6, 7, 8, 9, 10, & 11.

Sunny Steel Supply supplies a full range of ASTM A333 (ASME S/A 333)

Low Temperature Steel Pipe Specifications & Grades

• SA333 & A333 – Grades 1, 3, 6 & 8
• A671 CC65 CL22 EFW at -50°F (Welded Alternative to A333)
• Flanges: A/SA 350 LF2, LF3
• Fittings: A/SA-420 WPL6, WPL3

Size range 

• 1/4” Nominal to 24”O.D.
• Wall Thickness – Schedule 10 through XXH
• Unscheduled heavy wall pipe thicknesses available up to 4 inches. 

Strike temperature condition：

Crade	The lowest temperature for strike test
	℉	℃
ASTM A333 Grade 1	-50	-45
ASTM A333 Grade 6	-50	-45

 Mechanical requiremnts of ASTM A333 alloy pipe

Grade	Tensile Strength (MPa）	Yield Point (MPa)	Elongation (%)
			Y	X
Grade 1	≥380	≥205	≥35	≥25
Grade 3	≥450	≥240	≥30	≥20
Grade 4	≥415	≥240	≥30	≥16.5
Grade 6	≥415	≥240	≥30	≥16.5
Grade 7	≥450	≥240	≥30	≥22
Grade 8	≥690	≥515	≥22
Grade 9	≥435	≥315	≥28
Grade 10	≥550	≥450	≥22
Grade 11	≥450	≥240	≥18

 Chemical Composition (%) of ASTM A333 steel pipe

Grade	Chemical Composition (%)
	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	V	Al
Grade 1	≤0.30		0.40-1.06	≤0.025	≤0.025
Grade 3	≤0.19	0.18-0.37	0.31-0.64	≤0.025	≤0.025		3.18-3.82
Grade 4	≤0.12	0.18-0.37	0.50-1.05	≤0.025	≤0.025	0.44-1.01	0.47-0.98	0.40-0.75			0.04-0.30
Grade 6	≤0.30	≥0.10	0.29-1.06	≤0.025	≤0.025
Grade 7	≤0.19	0.13-0.32	≤0.90	≤0.025	≤0.025		2.03-2.57
Grade 8	≤0.13	0.13-0.32	≤0.90	≤0.025	≤0.025		8.40-9.60
Grade 9	≤0.20		0.40-1.06	≤0.025	≤0.025		1.60-2.24	0.75-1.25
Grade 10	≤0.20	0.10-0.35	1.15-1.50	≤0.03	≤0.015	≤0.15	≤0.25	≤0.015	≤0.50	≤0.12	≤0.06
Grade 11	≤0.10	≤0.35	≤0.6	≤0.025	≤0.025	≤0.50	35.0-37.0		≤0.50

Heat Treatment:

Grades 1 and 6 shall be heat treated to control their microstructure.

ASTM A333 Grade 6 and ASME SA 333 Grade 6 are heat treated to achieve normalized condition @ 920 degrees Celsius with controlled microstructure.

Specific Impact requirements

The raw material used for low temperature service pipe is ALUMINIUM killed with high proportion of manganese (more than 1%) combined with low proportions of carbon (less than 0.23%).For low temperature pipe to be certified as LTCS additional impact test should be conducted at low temperatures, as per mandatory requirements in section 8 of ASTM A 333.

Production specification range of low temperature pipe products

No.	Order No.	Size description
		O.D. /mm	W.T. /mm	Legnth /m
1	A333 Gr.6 A333 Gr.6/X42NS	10～127	1～20	6～12.0
		42～114.3	3.5～6	6～12.2
		42～114.3	6～12	6～12.2
		114.3～180	3.8～8	6～12.2
		114.3～180	8～22	6～12.2
		68～180	10～14	6～12.2
		69～254	14～55	6～12.2
		140～340	6～8	6～12.2
		140～368	8～42	6～12.2
		318～720	14～50	4～12.5
2	A333 Gr.6/X52QS	42～114.3	3.5～12	6～12.2
		114.3～180	3.8～22	6～12.2
		68～254	10～40	6～12.2
		140～368	6～40	6～12.2
		318～720	14～40	4～12.5
		140～368	6～25	6～12.2
		318～720	14～25	4～12.5
3	16MnDG	10～127	1～20	6～12.0
		42～114.3	3.5～12	6～12.2
		114.3～180	3.8～22	6～12.2
		68～254	10～55	6～12.2
		140～368	6～42	6～12.2
		318～720	14～120	4～12.5

For low temperature

Production specification range of low temperature pipe products

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