Carbon Steel ASTM A333 ERW pipe description
ASTM A333 carbon pipe is a type of cryogenic steel pipe with good corrosion resistance and excellent mechanical properties.
It is made of carbon steel and is suitable for transport systems in cryogenic environments, such as the transport of liquid oxygen, liquid nitrogen, and liquefied natural gas.
The ASTM A333 standard specifies the manufacturing requirements for steel pipes used in cryogenic environments, including chemical composition, mechanical properties, and heat treatment processes. Steel pipes conforming to this standard are typically used in environments ranging from -45°C to -196°C, ensuring that brittle fracture does not occur under cryogenic conditions.
A333 Hot Finished Pipe Chemical Requirements
| Composition, % | |||
| Element | Grade 1 | Grade 3 | Grade 6 |
| Carbon, max | 0.30 | 0.19 | 0.30 |
| Manganese | 0.40 – 1.06 | 0.31 – 0.64 | 0.29 – 1.06 |
| Phosphorous, max | 0.025 | 0.025 | 0.025 |
| Sulfur, max | 0.025 | 0.025 | 0.025 |
| Silicon | 0.18 -0.37 | 0.10 min | |
| Nickel | 3.18 – 3.82 | ||
ASTM A333 Low Temperature Pipes Tensile Requirements
| Grade 1 | Grade 3 | Grade 6 | |||||
| psi | MPa | psi | MPa | psi | MPa | ||
| Tensile Strength, min | 55,000 | 380 | 65,000 | 450 | 60,000 | 415 | |
| Yield Strength, min | 30,000 | 205 | 35,000 | 240 | 35,000 | 240 | |
| Longitudinal | Transverse | Longitudinal | Transverse | Longitudinal | Transverse | ||
| Elongation in 2 in. or 50 mm, (or 4D), min, %: | |||||||
| Basic minimum elongation for walls 5/16 in. [8 mm] and over in thickness, strip tests, and for all small sizes tested in full section | 35 | 25 | 30 | 20 | 30 | 16.5 | |
| When the standard round 2-in. or 50-mm gage length or proportionally smaller size test specimen with the gage length equal to 4D (4 times the diameter) is used | 28 | 20 | 22 | 14 | 22 | 12 | |
| For strip tests, a deduction for each 1/32in. [0.8 mm] decrease in wall thickness below 5/16 in. [8 mm] from the basic minimum elongation of the following percentage | 1.75 | 1.25 | 1.50 | 1.00 | 1.50 | 1.00 | |
| Elongation in 2 in. or 50 mm, min, % | |||||||
Applications
ASTM A333/ASME SA333 seamless and welded steel pipes for cryogenic equipment are mainly used in the following areas:
Cryogenic pressure vessels: such as liquefied natural gas (LNG) storage tanks, liquid oxygen storage tanks, etc.
Cryogenic heat exchangers: such as heat exchangers in air separation equipment, condensers in refrigeration systems, etc.
Other cryogenic equipment: such as cryogenic pipelines, cryogenic valves, etc.
Test and inspection
Packaging and shipping
