ASTM A333 covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures.

ASTM A333 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. All seamless and welded pipes shall be treated to control their microstructure.

A333 is composed of phosphorus, silicon, nickel chromium, molybdenum, and manganese. It typically has a carbon and phosphorus combination which gives it improved surface hardness, high tensile strength, and excellent wear-resistance. The alloy’s key physical properties include excellent formability, good ductility, and superior abrasion resistance.

A333 tubing has superior weldability, making it an ideal choice for applications that require weldability such as pressure vessels, process piping, and heat exchangers. The tubing is also good for hot-forming due to its good temperature capability and low hot strength.

A333 alloy tubing is commonly utilized in oil and gas production applications, onshore and offshore. For high reliability, it is the perfect material for use in extreme environments. The alloy can be used as an interchangeable standby for failing pieces of equipment or tubing, as it provides superior corrosion-resistance and long-term operation.

Due to its superior strength, A333 tubing is considered to be extremely beneficial for processing applications that demand optimum performance. Examples of such applications include wellhead operation, valve operations, and instrumentation. The tubing is widely used across various industries because its superior mechanical properties allow it to excel in both low and high-pressure applications.

A333 alloy tubing comes in both seamless and welded varieties. Seamless tubing consists of an unreinforced cylindrical shape, while welded tubing is welded with a filler material added to the outside of the external rim of the tubing. This provides added strength and durability.

Overall, A333 alloy tubing is an ideal product for various applications that require superior strength and performance. Its unrivaled ductility and weldability, combined with its long-term reliability, make it an ideal material for use in demanding environments.

Scope

ASTM A333 covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. Several grades of ferritic steel are included. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect 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 3	-150	-100
ASTM A333 Grade 4	-150	-100
ASTM A333 Grade 6	-50	-45
ASTM A333 Grade 7	-100	-75
ASTM A333 Grade 8	-320	-195
ASTM A333 Grade 9	-100	-75
ASTM A333 Grade 10	-75	-60

Chemical composition (%) of ASTM a333 steel pipe

Grade	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	V	Al
ASTM A333 Grade 1	≤0.30		0.40-1.06	≤0.025	≤0.025
ASTM A333 Grade 3	≤0.19	0.18-0.37	0.31-0.64	≤0.025	≤0.025		3.18-3.82
ASTM A333 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
ASTM A333 Grade 6	≤0.30	≥0.10	0.29-1.06	≤0.025	≤0.025
ASTM A333 Grade 7	≤0.19	0.13-0.32	≤0.90	≤0.025	≤0.025		2.03-2.57
ASTM A333 Gr. 8	≤0.13	0.13-0.32	≤0.90	≤0.025	≤0.025		8.40-9.60
ASTM A333 Grade 9	≤0.20		0.40-1.06	≤0.025	≤0.025		1.60-2.24	0.75-1.25
ASTM A333 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
ASTM A333 Grade 11	≤0.10	≤0.35	≤0.6	≤0.025	≤0.025	≤0.50	35.0-37.0		≤0.50

Mechanical requiremnts of ASTM A333 alloy pipe

Grade	Tensile Strength	Yield Point	Elongation (%)
	(MPa）	(MPa)	Y	X
ASTM A333 Grade 1	≥380	≥205	≥35	≥25
ASTM A333 Grade 3	≥450	≥240	≥30	≥20
ASTM A333 Grade 4	≥415	≥240	≥30	≥16.5
ASTM A333 Grade 6	≥415	≥240	≥30	≥16.5
ASTM A333 Grade 7	≥450	≥240	≥30	≥22
ASTM A333 Gr. 8	≥690	≥515	≥22
ASTM A333 Grade 9	≥435	≥315	≥28
ASTM A333 Grade 10	≥550	≥450	≥22
ASTM A333 Grade 11	≥450	≥240	≥18

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
No.	Order No.	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