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ASTM A204 steel is a kind of molybdenum-alloy steel material used to fabric high temperature pressure vessels and welded boilers. Obviously, ASTM A204 steel property is based on its molybdenum composition. ASTM A204 steel plate covers 3 grades: A204 Gr A, A204 Gr B, A204 Gr C.
Chemical Composition of ASTM A204 steel:
| Grade | The Element Max (%) | |||||
| C | Si | Mn | P | S | Mo | |
| A204 Gr A | 0.18-0.25 | 0.13-0.45 | 0.90-0.98 | 0.035 | 0.035 | 0.45–0.60 |
| A204 Gr B | 0.20-0.27 | 0.13-0.45 | 0.90-0.98 | 0.035 | 0.035 | 0.45–0.60 |
| A204 Gr C | 0.23-0.28 | 0.13-0.45 | 0.90-0.98 | 0.035 | 0.035 | 0.45–0.60 |
Mechanical Property of ASTM A204 steel:
| ASTM A204 | A204 Gr A | A204 Gr B | A204 Gr C |
| Tensile strength, kis [MPa] | 65-85 [450-585] | 70-90 [485-620] | 75-95 [515-655] |
| Yield strength, min, kis [MPa] | 37 [255] | 40 [275] | 43 [295] |
| Elongation in 8 in. [200 mm], min, % | 19 | 17 | 16 |
| Elongation in 2 in. [50 mm], min, % | 23 | 21 | 20 |
BBN steel is an experienced boiler and pressure steel plate supplier. BBN steel can offer you ASTM A204 steel plate of all grades and dimension range. The maximum thickness of ASTM A204 steel plate is limited only by the chemical composition to achieve certain mechanical property figure. ASTM A204 steel plate under ASTM A204/ A204M specification normally limit thickness as follows: 6 in[150mm] for A204 Gr A steel plate and A204 Gr B steel plate, 4 in[100mm] for A204 Gr C steel plate.
