ASTM A334 Grade 6 Carbon Steel Seamless Tubes
Material Description
ASTM A334 Grade 6 carbon steel seamless tubes are engineered low-temperature service pipes manufactured from medium carbon steel with controlled chemistry and mechanical properties to ensure reliability in sub-zero environments. They are available as seamless and welded tubes designed for pressure, fluid, and structural duties where high toughness and impact resistance at low temperatures are essential.
Specifications
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Standard: ASTM A334/A334M – Standard Specification for Seamless and Welded Carbon and Alloy-Steel Tubes for Low-Temperature Service
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Grade: 6
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Form: Seamless (hot finished or cold drawn)
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Diameter & Wall: Typically 1/2″ to 24″ OD with multiple schedule thickness options (Schedule 10 to 160 and others)
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Length: Standard random lengths or custom lengths up to approximately 27 m
Key Characteristics
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Low-Temperature Performance: Designed for service in sub-zero and cryogenic environments without loss of toughness
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Mechanical Strength: Balanced tensile strength, yield strength, and ductility suitable for pressure and thermal cycling
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Impact Toughness: Mandatory notch-bar impact testing to ensure resistance to brittle fracture at low temperatures
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Weldability & Fabrication: Good weldability and formability with low risk of cracking
Why Choose ASTM A334 Gr 6 Tubes
Reliable Low-Temperature Service
ASTM A334 Gr 6 tubes maintain structural integrity and toughness in freezing environments such as LNG systems, cryogenic plants, and cold-region pipelines.
Standards Compliance
Manufactured strictly in accordance with ASTM A334/A334M requirements and commonly supplied with additional testing and inspection certificates.
Broad Industrial Acceptance
Widely used in power generation, petrochemical processing, refineries, and heat-exchange systems where low-temperature reliability is critical.
Optimized Chemical and Mechanical Balance
Grade 6 offers a proven balance of strength, ductility, and impact resistance, reducing operational risk and extending service life.
Chemical Composition Comparison
| Grade |
C (max) |
Si (min) |
Mn |
P (max) |
S (max) |
| ASTM A334 Gr 1 |
≤ 0.30 |
≥ 0.10 |
0.40 – 1.06 |
≤ 0.025 |
≤ 0.025 |
| ASTM A334 Gr 3 |
≤ 0.19 |
≥ 0.10 |
0.31 – 0.64 |
≤ 0.050 |
≤ 0.050 |
| ASTM A334 Gr 6 |
≤ 0.30 |
≥ 0.10 |
0.29 – 1.06 |
≤ 0.025 |
≤ 0.025 |
| ASTM A334 Gr 7 |
≤ 0.19 |
≥ 0.13 |
≤ 0.90 |
≤ 0.040 |
≤ 0.050 |
| ASTM A334 Gr 8 |
≤ 0.18 |
≥ 0.13 |
≤ 0.90 |
≤ 0.045 |
≤ 0.045 |
Mechanical Properties Comparison
| Grade |
Tensile Strength (MPa, min) |
Yield Strength (MPa, min) |
Elongation (%) |
| ASTM A334 Gr 1 |
≥ 380 |
≥ 205 |
≥ 30 |
| ASTM A334 Gr 3 |
≥ 450 |
≥ 240 |
≈ 30 |
| ASTM A334 Gr 6 |
≥ 415 |
≥ 240 |
≥ 30 |
| ASTM A334 Gr 7 |
≥ 450 |
≥ 240 |
≈ 30 |
| ASTM A334 Gr 8 |
≥ 520 |
≥ 240 |
≈ 30 |
Applicable Standards
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ASTM A334/A334M – Carbon and alloy steel tubes for low-temperature service
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ASME SA334 – Equivalent specification under ASME Boiler and Pressure Vessel Code
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ASTM A370 – Mechanical testing
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ASTM E23 – Charpy impact testing
Application Fields
ASTM A334 Grade 6 seamless tubes are used in applications requiring dependable performance at low temperatures:
Oil & Gas
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Cryogenic fluid transfer pipelines
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Low-temperature gathering and transmission lines
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Process piping in cold climates
Petrochemical & Refining
Power & Energy
Industrial Equipment
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
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