ASTM A333 Gr6 Low-temperature seamless steel pipe specifications

ASTM A333 Gr6 seamless steel pipe is specially designed for use in cryogenic environments. It maintains excellent mechanical and physical properties in low-temperature environments (e.g., -40°C to -196°C, or even lower), ensuring safe and reliable use in cryogenic engineering.

Cryogenic carbon steel pipe is characterized by its ability to maintain sufficient strength, ductility, and toughness in cryogenic environments (e.g., -40°C to -196°C, or even lower).

A333Gr.6 Low-Temperature Seamless Steel Pipe Standard

A333Gr.6 belongs to the US ANSI and ASTM-SA333 low-temperature steel standards and is used under conditions with a minimum impact temperature of -46°C. Its operating temperature range and fracture toughness are similar to those of domestic 16Mn steel (the minimum operating temperature of 16Mn steel is -40°C).
The ASME SA333 standard (seamless and welded nominal steel pipe for low-temperature use) specifies A333-6 as a US designation, which is also used in many countries.
A333.Gr6 chemical composition: C ≤ 0.30%, Mn 0.29-1.06%, P ≤ 0.025%, S ≤ 0.025%, Si ≥ 0.10%.

The SA333 standard specifies a minimum impact test temperature of -45°C for A333.Gr.6, and this value is also used when determining the minimum temperature resistance when selecting.

ASTM A333 Gr6 Low-temperature seamless steel pipe specifications

Processing Method	Seamless and Welded
Size Range	1/8"- 48" / DN6 - 1200
Thickness Schedule	SCH 10, SCH 20, SCH 40, STD, XS, SCH 100, SCH 120, SCH 160, XXS
Length	6m or 12 m or Random
Standard	ASME B36.10M
Surface Treatment	Blasting and Painting , Epoxy Powder FBE, 2PE, 3PE Coating
Material Grade	ASTM A106B / A53, API 5L B / X42 / 46 / 52 / 56 / 60 / 65 / 70, A333 GR 6

Material Analysis of ASTM A333 Gr6 Seamless Steel Pipe

CHEMICAL	LIMITS	C	Mn	P	S	Si	Cu	Ni	Cr	Mo	V	Nb
ASTM A333 GR 6	MIN		0.29			0.10
	MAX	0.30	1.06	0.025	0.025		0.40	0.40	0.30	0.12	0.08	0.02

Regarding its impact on low-temperature impact toughness, phosphorus (P) is the element with the greatest impact on the Charpy toughness of ASTM A333 Gr.6 seamless steel pipe among C, Si, P, Si, and N. Its content should be reduced. The addition of manganese, along with small amounts of nickel, vanadium, copper, and niobium, can significantly lower the critical brittle-ductile transition temperature, refine grains, and thus improve impact toughness.

Low-Temperature Steel Pipe Dimensions

ASTM A333 Gr6 seamless steel pipe specifications primarily cover sizes ranging from 1/8" to 48" (DN6 to DN1200). Wall thicknesses for these pipes must comply with ASME B36.10 standards, and wall thickness grades include SCH 10, SCH 20, SCH 40, STD, XS, SCH 100, SCH 120, SCH 160, and XXS.

Referenced Weight Lists (ASME B 3 6 .1 0 M ) Welded and Seam less Steel Pipe(ASME B36.10M)										kg
Nominal  Size		OD	kg/m
DN	NPS	OD	Sch10	Sch20	Sch30	STD	Sch40	Sch60	XS	Sch80	Sch100	Sch120	Sch140	Sch160	XXS
6	1/8	10.3	0.28		0.32	0.37	0.37		0.47	0.47
8	1/4	13.7	0.49		0.54	0.63	0.63		0.80	0.80
10	3/8	17.1	0.63		0.70	0.84	0.84		1.10	1.10
15	1/2	21.3	1.00		1.12	1.27	1.27		1.62	1.62				1.95	2.55
20	3/4	26.7	1.28		1.44	1.69	1.69		2.20	2.20				1.90	3.64
25	1	33.4	2.09		2.18	2.50	2.50		3.24	3.24				4.24	5.45
32	1 1/4	42.2	2.70	– – –	2.87	3.39	3.39		4.47	4.47				5.16	7.77
40	1 1/2	48.3	3.11		3.53	4.05	4.05		5.41	5.41				7.25	9.56
50	2	60.3	3.93		4.48	5.44	5.44		7.48	7.48				11.11	13.44
65	2 1/2	73.0	5.26		8.04	8.63	8.63		11.41	11.41				14.92	20.39
80	3	88.9	6.45		9.92	11.29	11.29		15.72	15.72				21.35	27.68
90	3 1/2	101.6	7.40		11.41	13.57	13.57		18.63	18.63
100	4	114.3	8.36		12.91	16.07	16.07		22.32	22.32		28.32		33.54	41.03
125	5	141.3	11.57			21.77	21.77		30.97	30.97		40.28		49.11	57.43
150	6	168.3	13.48			28.26	28.26		42.56	42.56		54.20		67.56	79.22
200	8	219.1	19.96	33.31	36.81	42.55	42.55	53.08	64.64	64.64	75.92	90.44	100.9	111.3	107.9
250	10	273.0	27.78	41.77	51.03	60.31	60.31	81.55	81.55	96.01	114.8	133.1	155.2	172.3	155.2
300	12	323.9	36.00	49.73	65.20	73.88	79.73	109.0	97.46	132.1	159.9	187.0	208.1	238.8	187.0
350	14	355.6	54.69	67.90	81.33	81.33	94.55	126.7	107.4	158.1	195.0	224.7	253.6	281.7
400	16	406.4	62.64	77.83	93.27	93.27	123.3	160.1	123.3	203.54	245.6	286.7	333.2	365.4
450	18	457.0	70.57	87.71	122.4	105.2	.155.8	205.7	139.2	254.6	309.6	363.6	408.3	459.4
500	20	508	78.55	117.2	155.1	117.2	183.4	247.8	155.1	311.2	381.5	441.5	508.1	564.8
550	22	559	86.54	129.1	171.1	129.1		294.3	171.1	373.8	451.4	527.0	611.6	672.3
600	24	610	94.53	141.1	209.6	141.1	255.4	355.3	187.1	442.1	547.7	640.0	720.2	808.2
650	26	660	127.4	202.7		152.9			202.7
700	28	711	137.3	218.7	271.2	164.9			218.7
750	30	762	147.3	234.7	292.2	176.8			234.7
800	32	813	157.2	250.6	312.2	188.8	342.9		250.6
850	34	864	167.2	266.6	332.1	200.3	364.9		266.6
900	36	914	177.0	282.3	351.7	212.6	420.4		282.3
950	38	965				224.5			298.2
1000	40	1016				236.5			341.2
1050	42	1067				248.5			330.2
1100	44	1118				261.5			346.2
1150	46	1168				272.3			351.8
1200	48	1219				284.2			377.8

Applications of ASTM A333 Gr6 Carbon Steel Pipe

Petrochemical Industry
In the petrochemical industry, LPG needs to be stored and transported at low temperatures to maintain its liquid state. ASTM A333 Gr6 seamless steel pipe is used for LPG transportation pipelines, connecting pipes to storage tanks, and other applications.

Air Separation Unit
In an air separation unit, air must be cooled to extremely low temperatures (for example, the boiling point of liquid nitrogen is approximately -196°C) to separate gases such as oxygen, nitrogen, and argon. Cryogenic steel pipe is used in refrigeration circulation piping within the air separation unit and connecting pipes to gas separation towers.

Cryogenic Refrigeration Systems
Some specialized industrial processes, such as the preparation of superconducting materials, require extremely low temperatures (near zero degrees Celsius). Cryogenic steel pipe is used in the piping systems of these cryogenic refrigeration equipment, ensuring sealing and stability at extremely low temperatures, providing a stable low-temperature environment for the preparation of superconducting materials.

Aerospace
Liquid hydrogen (boiling point approximately -253°C) and liquid oxygen (boiling point approximately -183°C) are commonly used rocket propellants in space launches. ASTM A333 Gr6 seamless steel pipe is used in rocket engine components such as liquid hydrogen and liquid oxygen storage tanks and delivery pipelines.