ASTM A333 Grade 6 Pipe
Standard Low-Temperature Carbon Steel (LTCS) Pipe
ASTM A333 Grade 6 is the most widely specified carbon steel pipe for low-temperature service. Unlike Grade 3 which uses high Nickel, Grade 6 achieves its low-temperature properties through careful grain refinement and heat treatment (Normalized or Quenched & Tempered). It is designed to maintain high impact toughness at temperatures down to -50°F (-45°C), making it the industry standard for mid-range cryogenic and cold-climate oil and gas applications.
Technical Specifications
| Feature | Details |
|---|---|
| Standard | ASTM A333 / ASME SA333 |
| Grade | Grade 6 (Low Temp Carbon Steel) |
| Min. Impact Test Temp | -50°F (-45°C) |
| Size Range | 1/2" NB to 36" NB |
| Schedule | SCH 10 to SCH XXS |
| Manufacturing | Seamless / ERW / LSAW |
Mechanical Properties
| Property | ASTM A333 Grade 6 Value |
|---|---|
| Yield Strength (Min) | 35,000 psi (240 MPa) |
| Tensile Strength (Min) | 60,000 psi (415 MPa) |
| Elongation | Refer to standard elongation table |
| Min. Impact Energy (3 Specimens) | 18 Joules (13 ft-lb) |
Chemical Composition (%)
| Element | Percentage (Max unless specified) |
|---|---|
| Carbon (C) | 0.30% max |
| Manganese (Mn) | 0.29% - 1.06% |
| Phosphorus (P) | 0.025% max |
| Sulphur (S) | 0.025% max |
| Silicon (Si) | 0.10% min |
Features and Benefits of A333 Grade 6 Pipe
- Reliable impact toughness at temperatures as low as -45°C
- Excellent weldability using standard LTCS welding procedures
- Cost-effective alternative to high-alloy stainless steel for mid-low temperatures
- Fine-grained structure ensured through normalization heat treatment
- Suitable for both pressure piping and structural applications in cold climates
- Available in a wide variety of wall thicknesses and diameters
Applications & Uses
Gas Gathering
Ideal for gathering and transmission lines in regions where ground temperatures drop below freezing.
LPG Transport
Commonly used in the handling and storage of Liquefied Petroleum Gas (LPG).
Offshore Rigs
Essential for deck piping and equipment on offshore platforms in cold-water environments.