ASTM A333 Grade 6 Seamless Pipe Low Temperature Carbon Steel Pipe Pipes
ASTM A333 Grade 6 seamless pipes are low-temperature carbon steel pipes specifically designed for sub-zero and cryogenic service conditions.
Manufactured in accordance with ASTM A333 / ASME SA333, Grade 6 pipes are widely used in LNG plants, oil & gas transmission, petrochemical facilities, and low-temperature pressure piping systems, where reliable impact toughness is essential.
What Is ASTM A333 Grade 6?
ASTM A333 is a standard specification covering seamless and welded carbon and alloy steel pipes intended for low-temperature service.ASTM A333 Seamless and Welded Steel Pipe for Low-Temperature Service
Grade 6 (Gr.6) is the most widely used grade under this standard and requires mandatory Charpy V-notch impact testing to ensure toughness at low temperatures.
ASTM A333 Gr.6 pipes are typically supplied in the normalized or normalized and tempered condition.
Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications with Required Notch Toughness
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ASTM A333 Grade 6 pipe is common use material for low temperature services in above -45℃
Chemical Composition (Typical – ASTM A333 Gr.6)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.30 |
| Manganese (Mn) | 0.29 – 1.06 |
| Silicon (Si) | ≥ 0.10 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Nickel (Ni) | ≤ 0.40 |
| Chromium (Cr) | ≤ 0.30 |
| Molybdenum (Mo) | ≤ 0.12 |
Mechanical properties for ASTM A333 Grade 6 Seamless pipe
| Properties | Data |
| Tensile strength, min, (MPa) | 415 Mpa |
| Yield strength, min, (MPa) | 240 Mpa |
| Elongation, min, (%), L/T | 30/16.5 |
ASTM A333 Gr 6 pipes 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.
ASTM A333 Grade 6 :
35 ksi (240 MPa) min. YS
60 ksi (415 MPa) min. UTS
Impact Tested to meet
Minimum 18J (13 ft-lb) at
-46°C (-50°F)
ASTM A333 Grade 6 seamless Pipe Heat Treatment condition:
A333 Grade 6 Pipe should be Normalized at 1500 F and air cooled.
Quenched and tempered by heating to 1475 F.
Temper by re-heating to 1100 F and rapid air cooling.
The Astm A333 Gr 6 Pipes is used to produce A420 WPL6 Pipe fittings,and match with ASTM A350 LF2 Flanges, and A320 Gr L7 stud bolts & A194 Gr 7 hex nuts in the pipeline connections.
| Material | Pipes | Buttweld Fittings | Forged Steel Fittings | Valves | Bolts and Nuts |
| Low Temp Carbon Steel | A333 GR6 | A420 WPL6 | ASTM A350 LF2 | A352 LCB | A320 Gr L7 /A194 Gr 7 |
ASTM A333 GR.6 Pipes Charpy V-Notch Impact Test
However,we can supply the ASTM A333 GR.6 Pipes with impact testing at minus 52° С (-52° С). Impact test result
(Charpy test on V-notch specimen) shall be at least 27 J/cm2
ASTM A333 GR.6 Pipe NDE Testing
All pipes shall be subject to a hydrostatic testing. The actual test pressure value shall be shown in the inspection certificate. In case applicable ASTM specification has no details regarding hydrostatic testing ASTM A999-2018 shall be applied.
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
Size Range & Specifications
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Manufacturing: Seamless
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Outside Diameter: 1/8″ – 24″
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Wall Thickness: SCH 10, 20, 40, STD, XS, XXS
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Length: Random / Fixed / Cut Length
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Heat Treatment: Normalized / Normalized & Tempered
Inspection & Testing
ASTM A333 Gr.6 seamless pipes are supplied with comprehensive inspection and testing, including:
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Chemical composition analysis
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Mechanical property testing
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Charpy V-notch impact testing
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Hydrostatic or non-destructive testing (NDT)
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Dimensional inspection
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Visual examination
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Certification: EN 10204 3.1
Material Grade:ASTM A333 Grade 6
How to order our Astm A333 Gr 6 Seamless Pipes?
PIPE , A333 GR.6, 80, NPS10 Pipe, Carbon Steel Per ASTM A333 Grade 6, Schedule 80, Seamless, Bevelled Both Ends, Per ANSI B36.10, To be Supplied in Double Random Lengths
PIPE MET, A333 GR.6, 20, NPS24 Pipe, Carbon Steel Per ASTM A333 Grade 6, Schedule 20, Seamless, Bevelled Both Ends, Per ANSI B36.10, To be Supplied in Double Random Lengths
We are a trusted manufacturer, supplier, and exporter of ASTM A333 Grade 6 Seamless Pipes for low-temperature service applications. Our A333 Gr.6 pipes are engineered to deliver superior impact strength and toughness at temperatures down to –45°C, ensuring reliable performance in cryogenic, LNG, and petrochemical industries.
