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Executive Standard: SA299 Gr. B steel plates comply with the ASME standard, specifically ASTM A299/A299M.2026-08-26
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SA299 is a carbon-manganese-silicon steel plate designed for pressure vessels—often referred to as "gas drum steel" under US standards.2026-08-19
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ntroduction to SA299 Gr.A Steel Plate:
SA299 Gr.A is a steel plate grade designated for boilers and pressure vessels under American standards.2026-08-11 -
A285 Gr.C and SA285 Gr.C steel plates represent the same grade, though they are governed by different standards.2026-08-04
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SA283 Gr.B is a low-to-medium strength carbon structural steel plate conforming to the American Society of Mechanical Engineers (ASME) standard.2026-07-31
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ASTM A285/A285M standards apply to carbon steel plates for welded pressure vessels. They are classified into three grades (A, B, and C) based on strength, corresponding to different tensile strength ranges:
45-65 ksi (310-450 MPa);
50-70 ksi (345-485 MPa);
55-75 ksi (380-515 MPa);
ASTM A285/A285M Chemical Composition:
This compositional design ensures good weldability and formability of the material, while controlling phosphorus and sulfur content to guarantee its toughness.
Grade A has the lowest carbon content and the best weldability, making it suitable for applications with high weldability requirements; Grade C has a relatively higher carbon content and correspondingly higher strength, making it suitable for pressure vessels with higher load-bearing requirements.
In pressure vessel design, the selection of A285 material requires consideration of several factors:
Grade A selection criteria: Suitable for applications with design temperatures not exceeding 650°F (343°C), especially for equipment with high weldability requirements, such as low-pressure storage tanks and heat exchanger tube sheets.
Grade B application range: Medium strength requirements, suitable for pressure vessel shells with design temperatures not exceeding 650°F, offering good overall performance and economy.
Grade C application scenarios: Higher strength requirements, suitable for vessels with higher design pressures, but attention must be paid to the welding process requirements due to its higher carbon content.
45-65 ksi (310-450 MPa);
50-70 ksi (345-485 MPa);
55-75 ksi (380-515 MPa);
ASTM A285/A285M Chemical Composition:
| Element | Grade A | Grade B | Grade C |
| C (max) | 0.17% | 0.22% | 0.28% |
| Mn (max) | 0.90% | 0.98% | |
| P (max) | 0.025% | ||
| S (max) | 0.025% |
This compositional design ensures good weldability and formability of the material, while controlling phosphorus and sulfur content to guarantee its toughness.
Grade A has the lowest carbon content and the best weldability, making it suitable for applications with high weldability requirements; Grade C has a relatively higher carbon content and correspondingly higher strength, making it suitable for pressure vessels with higher load-bearing requirements.
| Grade A | Grade B | Grade C | |
| Tensile strength (ksi/MPa) | 45-65/310-450 | 50-70/345-485 | 55-75/380-515 |
| Yield strength (min) (ksi/MPa) | 24/165 | 27/185 | 30/205 |
| Elongation at 8-inch (min) (%) | 27 | 25 | 23 |
| Elongation at 2-inch (min) (%) | 30 | 28 | 27 |
In pressure vessel design, the selection of A285 material requires consideration of several factors:
Grade A selection criteria: Suitable for applications with design temperatures not exceeding 650°F (343°C), especially for equipment with high weldability requirements, such as low-pressure storage tanks and heat exchanger tube sheets.
Grade B application range: Medium strength requirements, suitable for pressure vessel shells with design temperatures not exceeding 650°F, offering good overall performance and economy.
Grade C application scenarios: Higher strength requirements, suitable for vessels with higher design pressures, but attention must be paid to the welding process requirements due to its higher carbon content.