ASTM A333 Grade 6 Low-temperature seamless steel pipe

Description

STM A333 Grade 6 Carbon Steel Seamless Pipes are Medium Carbon Steel Pipes with max 0.30 % carbon content with combination of 0.29 – 1.06 % manganese. These Pipes are most commonly used for general purpose applications worldwide. ASTM A333 Grade 6 Pipes are ductile and strong Pipes with long wearing properties. These Pipes are manufactured as per ASME Specification and commercially referred as carbon steel Pipes.

ASTM A333 Seamless and Welded Steel Pipe for Low-Temperature Service

Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications with Required Notch Toughness

ASTM A333 Grade 6 Seamless Pipe involved is similar to AISI 4032 low alloy steel. The ASTM A333 Grade 6 low alloy steel seamless pipes are intended for low temperature services with minimum design temperature -45°C [-50°F] requiring notch toughness. They are usually furnished in nominal pipe size (NPS) and nominal wall thickness with schedule numbers in accordance with ASME B36.10M. They are often connected with flanges of ASTM A350 LF2 and butt-weld pipe fittings of ASTM A420 WPL6. Seamless pipes made from ASTM A333 Gr.6 are primarily used for the construction of pipelines in the production of ethylene, propylene, urea, ammonia, and N-P-K compound fertilizer. They may be involved in the scrubber, purification, desulfurization and degreasing processes in oil & gas, petrochemical, coal and pharmaceutical industries. They can also be used for the fabrication of cryogenic equipment as well as refrigeration houses.

ASTM A333 Grade 6 is the part of standard covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. ASTM A333 Grade 6 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.

ASTM A333 GR.6 Pipes Charpy V-Notch Impact Test

Toughness, or ductility, is the ability of a material to resist impact, to withstand repeated reversals of stress, or to absorb energy when stressed beyond the elastic limit. Steel is normally considered to be a ductile material, however, it may shatter just as glass at certain low temperatures. The critical ductile-to-brittle transition temperature (CDBTT) for any steel is the temperature above which the steel behaves in a predominantly ductile manner and below which it behaves in a predominantly brittle manner. The low alloy steel pipe of ASTM A333 Gr.6 with a low CDBTT can be used at temperatures down to -45°C [-50°F]. It is important to verify that the pipe materials are impact tested and exhibit a sufficient high Charpy toughness.

The Charpy V-notch impact test shall be conducted at -45°C [-50°F] with three testing specimens in the size of 10 mm x 10 mm x 55 mm. The minimum average energy absorbed for three specimens shall be 18 J [13 ft*lbf], and the minimum energy absorbed for each specimen is 14 J [10 ft*lbf]. The actual tests have been done to three specimens which were taken from ASTM A333 Gr.6 seamless pipes produced by BAOSTEEL. The results listed in the table below indicate that the steel exhibits superior impact toughness, which is at least 20 times higher than the standard value.

Raw material

Size inspection

Seamless pipes with compound bevels as per ASME B16-25 And ASTM A333

Application: Seamless and Welded Steel Pipe for Low-Temperature Service.

Steel grade: ASTM A333 Grade 6

Inspection and Test: Chemical Composition Inspection, Mechanical Properties Test(Tensile Strength,Yield Strength, Elongation, Flaring, Flattening, Bending, Hardness, Impact Test), Surface and Dimension Test,No-destructive Test, Hydrostatic Test.

Surface treatment: Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting.
Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.

ASTM A333 Grade 6 Chemical Compositions(%)

Compositions	Data
Carbon(max.)	0.30
Manganese	0.29-1.06
Phosphorus(max.)	0.025
Sulfur(max.)	0.025
Silicon	…
Nickel	…
Chromium	…
Other Elements	…

Mechanical properties for ASTM A333 Grade 6 Alloy Steel

Properties	Data
Tensile strength, min, (MPa)	415 Mpa
Yield strength, min, (MPa)	240 Mpa
Elongation, min, (%), L/T	30/16.5

Impact requirements:

the notched-bar impact properties of each set of three impact specimens, when tested at temperature specified shall be not less than the values prescribed.

Referenced Documents

• ASTM A 370 Test Methods and Definitions for Mechanical testing of Steel Products
• ASTM A999/A 999M Specification for General requirements for Alloy and Stainless Steel Pipe.
• ASTM A 671 Specification for General requirements for Alloy and Stainless Steel Pipe
• ASTM E 23 Test Methods for Notched bar Impact testing of Metallic Materials

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.

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

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

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

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

Acceptable for ASME Codes

ASME Codes	ASTM A333 Gr.6
B31.1	Yes
B31.3	Yes
B31.4	Yes
B31.5	Yes
31.8	Yes
Section I	Yes
Section III	Yes
Section VIII-1	Yes
Section XII	Yes
Section VIII-2	Yes

*The UNS number of ASTM A333 Gr.6 is K03006, with the P-number of 1.