ASME SA 333 Grade 6 Carbon Steel Seamless Pipes description
GR6 seamless steel pipes strictly adhere to the ASTM A333/A333M standard specification for seamless and welded steel pipes for cryogenic equipment, established by the American Society for Testing and Materials (ASTM). This standard details the chemical composition, mechanical properties, manufacturing process, testing methods, and quality control requirements of the steel pipes, ensuring reliable performance in cryogenic environments. The standard classifies GR6 as a -45°C cryogenic steel pipe, suitable for various industrial piping systems with stringent requirements for low-temperature toughness.
ASTM A333 Grade 6 Steel Pipe specification
Chemical Components
| Elemental, % | ASTM A333 Grade 6 |
| Carbon | 0.30 max |
| Manganese | 0.29 – 1.06 a |
| Phosphorus | 0.025 max |
| Sulfur | 0.025 max |
| Silicon | 0.10 min |
| Nickel | 0.40 max |
| Chromium | 0.30 max |
| Copper | 0.40 max |
| Vanadium | 0.08 max |
| Niobium d | 0.02 max c |
| Molybdenum | 0.12 max |
Mechanical Properties
Tensile Requirement
Tensile Strength and Yield Strength
| Tensile | ASTM A333 Grade 6 |
| Tensile strength, min, psi [MPa] | 60000 [415] |
| Yield strength, min, psi [MPa] | 35000 [240] |
Elongation
| Elongation | ASTM A333 Grade 6 | ||
| 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 | 30 | 16.5 |
| When 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 | 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 | 1.50 b | 1.00 b | |
b The following table gives the calculated minimum values.
| computed minimum elongation values for each 1/32 in. [0.80 mm] decrease in wall thickness | |||
| Wall Thickness | Grade 6 | ||
| in. | mm | longitudinal | transverse |
| 5/16 [0.312] | 8 | 30 | 16 |
| 9/32 [0.281] | 7.2 | 28 | 15 |
| 1/4 [0.250] | 6.4 | 27 | 15 |
| 7/32 [0.219] | 5.6 | 26 | - |
| 3/16 [0.188] | 4.8 | 24 | - |
| 5/32 [0.156] | 4.0 | 22 | - |
| 1/8 [0.125] | 3.2 | 21 | - |
| 3/32 [0.094] | 2.4 | 20 | - |
| 1/16 [0.062] | 1.6 | 18 | - |
SA333 GR6 LCTS Pipe Equivalent
| ASME | EN | GB |
| ASME SA333 Grade 6 | EN 10216-4 P265NL | GB/T 18984 16MnDG |
A333 GR6 Low-Temperature Impact Performance
Impact Test Temperature: -45℃ (-50°F); Impact Energy Requirement: ≥13 Joules
Test Method: Charpy impact test, specimen size 10mm × 10mm, transfer time from cooling device to impact testing machine not exceeding 5 seconds.
Maintaining an impact energy of ≥13J at -45℃ demonstrates its excellent low-temperature toughness. Actual tests often achieve 296-308J, far exceeding the standard requirement.
Test and inspection
Packaging and shipping
