A204 Grade B for Heat Exchanger
ASTM A204 Grade B is used in fabricators serving industry, especially in the oil, gas and chemical supply markets. ASTM A204 specification covers molybdenum alloy steel plates, intended particularly for welded boilers and other pressure vessels.
"A204" is the standard number, indicating that this is a steel plate under the ASTM A204 standard; "Gr" is the abbreviation of "Grade", representing the grade; "B" stands for the specific identifier of this grade, that is, Grade B steel plate.
ASTM A204 Grade B steel plate chemical composition
- Carbon (C): ≤ 0.25%
- Manganese (Mn): 0.40% - 0.70%
- Phosphorus (P): ≤ 0.035%
- Sulfur (S): ≤ 0.035%
- Silicon (Si): 0.15% - 0.40%
- Chromium (Cr): 1.00% - 1.50%
- Molybdenum (Mo): 0.45% - 0.65%
ASTM A204 Grade B steel plate Mechanical properties
| ASTM A204 | Grade B |
| Tensile strength, kis [MPa] | 70-90 [485-620] |
| Yield strength, min, kis [MPa] | 40 [275] |
| Elongation in 8 in. [200 mm], min, % | 17 |
| Elongation in 2 in. [50 mm], min, % | 21 |
ASTM A204 Equivalent steel grade:
| ASTM | GB | JIS | DIN | EN | |||||
|---|---|---|---|---|---|---|---|---|---|
| Steel Grade | Steel Grade | Steel Grade | Standard Number | Steel Grade | Material Number | Standard Number | Steel Grade | Material Number | Standard Number |
| A204-Gr. A.B | 16Mo | 16Mo | G3103 | 15 Mo3 | 1.5414 | DIN17155 | 16Mo3 | 1.5415 | EN 10028-2 |
What is the difference between A204 Grade B and A36?
| Property | A204 Grade B | A36 |
|---|---|---|
| Standard | ASTM A204 (Pressure Vessel Plates) | ASTM A36 (Structural Steel) |
| Composition | Molybdenum (Mo) alloy, controlled carbon | Plain carbon steel, no alloying |
| Tensile Strength | 485-620 MPa | 400-550 MPa |
| Yield Strength | ≥ 275 MPa | ≥ 250 MPa |
| Operating Temp. | -30°C to 450°C (superior high-temp. performance) | Ambient (softens at high temps) |
| Primary Uses | High-pressure/temperature vessels, boilers, chemical equipment | Buildings, bridges, machinery bases |
What is the difference between A204 Grade B and A36?
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Boiler steel sheet plate is widely used in the following respects: (1) bridge plate (5) the car plate (9) spring plate |
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