ASTM A333 Seamless steel Pipe and Welded steel pipe
ASTM A333 (ASME S/A-333) Seamless Steel Pipe and Welded Steel Pipe grades permit low temperature service. This specification covers nominal (average) walled pipe almost exclusively in seamless. Several grades of ferritic steel are included. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse effect on low-temperature impact properties. A333 pipe is furnished to nine different grades designated by numbers 1, 3, 4, 6, 7, 8, 9, 10, & 11. Discussed herein are Grades 1 and 6.
Sizes
1/4” Nominal to 24”O.D.
Wall thickness – Schedule 10 through XXH
Mainly Grade：
Grade 1, Grade 3, Grade 4, Grade 6, Grade 7, Grade 8, Grade 9, Grade 10, Grade 11
Strike Temperature Condition:
| Grade | The lowest temperature for strike test | |
| ℉ | ℃ | |
| Grade 1 | -50 | -45 |
| Grade 3 | -150 | -100 |
| Grade 4 | -150 | -100 |
| Grade 6 | -50 | -45 |
| Grade 7 | -100 | -75 |
| Grade 8 | -320 | -195 |
| Grade 9 | -100 | -75 |
| Grade 10 | -75 | -60 |
Mechanical Properities:
| 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 | ||
Grade and Chemical Composition:
| 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 | ||||
*For each reduction of 0.01% carbon below 0.30%, an increase of 0.05% manganese above 1.06% would be permitted to a maximum of 1.35% manganese. When Grade 6 is ordered under this specification, supplying an alloy grade that specifically requires the addition of any element other than those listed for the ordered grade is not permitted. However, the addition of elements required for the deoxidation of the steel is permitted.
Scope:
ASTM A333 covers nominal (average) wall seamless and welded carbon and Alloy steel pipe intended for use at low temperatures. Several grades of ferritic steel are included. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.
