ASTM A333 (ASME S/A-333) 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.
Bestar Steel provides ASTM A333 pipes made by the seamless or welded process with the addition of no filler metal in the welding operation except that Grade 4 shall be made only by seamless process. The pipe shall be furnished free of welding repair, either radiographically tested or ultrasonically examined.
1. ASTM A333 Chemical Composition Requirements
| Chemical Composition of ASTM A333 | |||||||||
| Element | Grade 1, % | Grade 3, % | Grade 4, % | Grade 6, % | Grade 7, % | Grade 8, % | Grade 9, % | Grade 10, % | Grade 11, % |
| C | 0.30 | 0.19 | 0.12 | 0.30 | 0.19 | 0.13 | 0.20 | 0.20 | 0.10 |
| Mn | 0.40–1.06 | 0.31–0.64 | 0.50–1.05 | 0.29–1.06 | 0.90 | 0.90 | 0.40–1.06 | 1.15–1.50 | 0.60 |
| P | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.035 | 0.025 |
| S | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.015 | 0.025 |
| Si | … | 0.18–0.37 | 0.08–0.37 | 0.10 min | 0.13–0.32 | 0.13–0.32 | … | 0.10–0.35 | 0.35 |
| Ni | … | 3.18–3.82 | 0.47–0.98 | 0.40 | 2.03–2.57 | 8.40–9.60 | 1.60–2.24 | 0.25 | 35.0–37.0 |
| Cr | … | … | 0.44–1.01 | 0.30 | … | … | … | 0.15 | 0.50 |
| Cu | … | … | 0.40–0.75 | 0.40 | … | … | 0.75–1.25 | 0.15 | … |
| Al | … | … | 0.04–0.30 | … | … | … | … | 0.06 | … |
| V | … | … | … | 0.08 | … | … | … | 0.12 | … |
| Cb | … | … | … | 0.02 | … | … | … | 0.05 | … |
| Mo | … | … | … | 0.12 | … | … | … | 0.05 | 0.50 |
| Co | … | … | … | … | … | … | … | … | 0.50 |
*For Grade 1 and 6, each reduction of 0.01% C below 0.30%, an increase of 0.05 % Mn above 1.06 % would be permitted to a max. of 1.35%.
*For Grade 6, the limit for columbium may be increased up to 0.05 % on heat analysis and 0.06 % on product analysis.
*Generally, the carbon equivalent C.E = [C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15] shall not exceed 0.43% by heat analysis.
2. ASTM A333 Mechanical Properties
| ASTM A333 | Tensile Strength, min. | Yield Strength, min. | Elongation %, min. | |||
| Grade | psi | MPa | psi | MPa | Longitudinal | Transverse |
| Grade 1 | 55 000 | 380 | 30 000 | 205 | 35 | 25 |
| Grade 3 | 65 000 | 450 | 35 000 | 240 | 30 | 20 |
| Grade 4 | 60 000 | 415 | 35 000 | 240 | 30 | 16.5 |
| Grade 6 | 60 000 | 415 | 35 000 | 240 | 30 | 16.5 |
| Grade 7 | 65 000 | 450 | 35 000 | 240 | 30 | 22 |
| Grade 8 | 100 000 | 690 | 75 000 | 515 | 22 | … |
| Grade 9 | 63 000 | 435 | 46 000 | 315 | 28 | … |
| Grade 10 | 80 000 | 550 | 65 000 | 450 | 22 | … |
| Grade 11 | 65 000 | 450 | 35 000 | 240 | 18 | … |
*The elongation values are furnished on the basis of standard round 2 inch or 50 mm(or 4D) specimens.
*Elongation of Grade 11 is for all walls and small sizes tested in full section.
3. Charpy V-notch Impact Tests
| Impact Requirements for Grades 1, 3, 4, 6, 7, 9, 10, and 11 | ||||
| Size of Specimen | *A | *B | ||
| mm | ft·lbf | J | ft·lbf | J |
| 10 by 10 | 13 | 18 | 10 | 14 |
| 10 by 7.5 | 10 | 14 | 8 | 11 |
| 10 by 6.67 | 9 | 12 | 7 | 9 |
| 10 by 5 | 7 | 9 | 5 | 7 |
| 10 by 3.33 | 5 | 7 | 3 | 4 |
| 10 by 2.5 | 4 | 5 | 3 | 4 |
*A denotes minimum average notched bar impact value of each set of three specimens.
*B denotes minimum notched bar impact value of one specimen only of a set.
| Minimum Impact Test Temperature of ASTM A333 | ||
| Grade | °F | °C |
| 1 | -50 | -45 |
| 3 | -150 | -100 |
| 4 | -150 | -100 |
| 6 | -50 | -45 |
| 7 | -100 | -75 |
| 8 | -320 | -195 |
| 9 | -100 | -75 |
| 10 | -75 | -60 |
| 11 | -320 | -195 |
* Impact tests specified for temperatures lower than 70 °F [20 °C] should be made with precautions.
Post time: Feb-09-2022