ASTM A333 Standard covers seamless and welded steel pipe for low temperature service. The Grade 6 steel involved is similar to AISI 4032 low alloy steel. ASTM A333 Grade 6 pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.
Seamless and Welded Steel Pipe size for Low-Temperature Service:
● Outer Dimensions: 19.05mm-114.3mm
● Wall Thickness:2.0mm-14 mm
● Length: max 16000mm
Application: Seamless and Welded Steel Pipe for Low-Temperature Service.
Steel grade: ASTM A333 Grade 6
Inspection and Test:
● Chemical Composition Inspection, Mechanical Properties Test
● Tensile Strength,Yield Strength, Elongation, Flaring, Flattening, Bending, Hardness, Impact Test
● Surface and Dimension Test,No-destructive Test, Hydrostatic Test.
Note 1: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter”, “size”, and “nominal size”.
Strike temperature condition：
| Crade | The lowest temperature for strike test | |
| ℉ | ℃ | |
| ASTM A333 Grade 1 | -50 | -45 |
| ASTM A333 Grade 3 | -150 | -100 |
| ASTM A333 Grade 4 | -150 | -100 |
| ASTM A333 Grade 6 | -50 | -45 |
| ASTM A333 Grade 7 | -100 | -75 |
| ASTM A333 Grade 8 | -320 | -195 |
| ASTM A333 Grade 9 | -100 | -75 |
| ASTM A333 Grade 10 | -75 | -60 |
Mechanical requiremnts of ASTM A333 alloy pipe
| Standard | Grade | Tensile Strength (MPa） | Yield Point (MPa) | Elongation (%) | |
| Y | X | ||||
| ASTM A333 | Grade 1 | ≥380 | ≥205 | ≥35 | ≥25 |
| Grade 3 | ≥450 | ≥240 | ≥30 | ≥20 | |
| Grade 4 | ≥415 | ≥240 | ≥30 | ≥16.5 | |
| Grade 6 | ≥415 | ≥240 | ≥30 | ≥16.5 | |
| Grade 7 | ≥450 | ≥240 | ≥30 | ≥22 | |
| Grade 8 | ≥690 | ≥515 | ≥22 | ||
| Grade 9 | ≥435 | ≥315 | ≥28 | ||
| Grade 10 | ≥550 | ≥450 | ≥22 | ||
| Grade 11 | ≥450 | ≥240 | ≥18 | ||
Chemical Composition (%) of ASTM A333 steel pipe
| Standard | Grade | Chemical Composition (%) | ||||||||||
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo | V | Al | ||
| ASTM A333 | Grade 1 | ≤0.30 | 0.40-1.06 | ≤0.025 | ≤0.025 | |||||||
| Grade 3 | ≤0.19 | 0.18-0.37 | 0.31-0.64 | ≤0.025 | ≤0.025 | 3.18-3.82 | ||||||
| Grade 4 | ≤0.12 | 0.18-0.37 | 0.50-1.05 | ≤0.025 | ≤0.025 | 0.44-1.01 | 0.47-0.98 | 0.40-0.75 | 0.04-0.30 | |||
| Grade 6 | ≤0.30 | ≥0.10 | 0.29-1.06 | ≤0.025 | ≤0.025 | |||||||
| Grade 7 | ≤0.19 | 0.13-0.32 | ≤0.90 | ≤0.025 | ≤0.025 | 2.03-2.57 | ||||||
| Grade 8 | ≤0.13 | 0.13-0.32 | ≤0.90 | ≤0.025 | ≤0.025 | 8.40-9.60 | ||||||
| Grade 9 | ≤0.20 | 0.40-1.06 | ≤0.025 | ≤0.025 | 1.60-2.24 | 0.75-1.25 | ||||||
| Grade 10 | ≤0.20 | 0.10-0.35 | 1.15-1.50 | ≤0.03 | ≤0.015 | ≤0.15 | ≤0.25 | ≤0.015 | ≤0.50 | ≤0.12 | ≤0.06 | |
| Grade 11 | ≤0.10 | ≤0.35 | ≤0.6 | ≤0.025 | ≤0.025 | ≤0.50 | 35.0-37.0 | ≤0.50 | ||||
Referenced Documents
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A671 Specification for Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures
A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe
E23 Test Methods for Notched Bar Impact Testing of Metallic Materials
ASTM A333 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.
ASTM A333 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. All seamless and welded pipes shall be treated to control their microstructure.