Low Temperature Carbon Steel A333 Grade 6 Pipe
Dec 04, 2025
ASTM A333 Gr 6 Carbon Steel Pipe description
A333 Gr.6 is an ASTM-compliant low-temperature pipe specifically engineered for cryogenic pressure vessel pipelines and cryogenic heat exchanger tubing operating within -45°C to -195°C.
A333 Gr.6 seamless steel pipes play a critical role across multiple sectors, particularly in the petrochemical industry, where they are extensively used in:
Production processes for ethylene, polypropylene, synthetic ammonia, and LPG.
Additionally, these pipes are indispensable in:
Cryogenic equipment manufacturing
Ultra-low-temperature cold storage facilities
Pipelines transporting ultra-cryogenic liquefied gases.
A333 GR6 LTCS Pipe Specification
| Standards | ASTM, ASME and API |
| Craft | Cold rolled and Cold drawn |
| Type | ERW / Seamless / Fabricated / Welded / CDW |
| Size | 1/2" NB to 36" NB |
| Form | Round, Hydraulic Etc |
| Thickness | 3-12mm |
| End | Beveled End, Plain End, Treaded |
| Schedules | Schedule 40, 80, 160, XS, XXS |
| Additional Testing | NACE TM0177, NACE MR0175, NACE TM0284, SSC TEST, HIC TEST, H2 SERVICE, IBR, etc. |
| Tolerance | Cold drawn pipe: +/-0.1mm
Cold rolled pipe: +/-0.05mm |
| Length | Minimum 3 Meters, Maximum 18 Meters |
|
Specialized in |
Large Diameter ASTM A333 Grade 6 Pipe |
SA 333 Gr 6 Material Chemical And Physical Properties
| A333 Gr.6 | C | Mn | P | S | Si | Ni |
| 0.3 | 0.29-1.06 | 0.025 | 0.025 | ≥0.10 | – |
LTCS ASTM A333 Gr 6 Pipes Mechanical Analysis
| Grade | Yield strength, min, psi (MPa) | Tensile strength, min, psi (MPa) | Elongation (%) |
| A333 Gr.6 | 35 000 (240) | 60 000 (415) | 30 min |
ASME SA333 Grade 6 Pipe Equivalent
| Grade | Pipe | Tube | Fittings | Flanges | Bar | Forgings | EN | Material |
|---|---|---|---|---|---|---|---|---|
| Low Temp C.S. Gr. 6 | A333 GR. 6 | A333 GR. 6 | A420 WPL6 | A350 LF2 | A516 | A350 LF2 | EN 10216-4 | P265NL |
ASTM A333 Gr.6 vs Gr.1 Comparison Table
| Parameter | Gr.6 | Gr.1 |
|---|---|---|
| Core Alloy | Ni-Enhanced (Ni: 3.2–3.6%) | C-Mn Base Steel (Ni: 0%) |
| Temperature Range | -45°C (Min. Design Temp) | -29°C (Min. Design Temp) |
| Impact Test Temp | -45°C (Charpy V-notch) | -29°C (Charpy V-notch) |
| Impact Energy Req. | ≥18J (Single) / ≥20J (Avg) | ≥18J (Single) / ≥20J (Avg) |
| Ductile-Brittle Transition Temp (DBTT) | ≈-70°C | ≈-20°C |
| Cryo Toughness Mech. | Ni inhibits grain boundary embrittlement, stabilizes austenite | Relies on fine grains + purity control |
| Applications | • LNG Secondary Pipes (-45~-100°C) • Liquid Ammonia Equipment |
• Chilled Water Systems (-20°C) • Arctic Oil/Gas Pipelines |
| Welding Process | Ni-based Filler (e.g., ENiCrFe-3) + Preheat 150°C | Carbon Steel Filler (e.g., E7018) + Preheat 95°C |
| Cost Reference | ≈1.8× Gr.1 (Ni-alloy premium) | Cost Baseline |
| Failure Risk | Accelerated oxidation >50°C | Rapid embrittlement <-30°C |
Test and inspection
Packaging and shipping
