A204 Grade C material is a molybdenum-alloy steel plate, intended particularly for welded boilers and other pressure vessels.
ASTM A285 Grade C steel is a kind of carbon steel plates of low- and intermediate-tensile strengths which may be made by killed, semi-killed, capped, or rimmed steel.
| Material | C | Si | Mn | P | S | Mo | 
| A204 Grade C | 0.23-0.28 | 0.15-0.40 | 0.90 max. | 0.025 max. | 0.025 max. | 0.45–0.60 | 
| A285 Grade C | 0.28 max. | - | 0.90 max | 0.025 max. | 0.025 max. | - | 
ASTM A204 Grade C steel mechanical properties
| Item | A204 Grade C | 
| Tensile strength, kis [MPa] | 75-95 [515-655] | 
| Yield strength, min, kis [MPa] | 43 [295] | 
| Elongation in 8 in. [200 mm], min, % | 16 | 
| Elongation in 2 in. [50 mm], min, % | 20 | 
ASTM A285 Grade C steel mechanical properties
| Material | Tensile strength ,MPa | Yield strength, MPa | Elongation in 8 in. [200 mm],A% | Elongation in 2 in. [50 mm], A% | 
| A285 GrC | 380-515 | ≥205 | ≥23 | ≥27 | 
Katalor as a pressure vessel plates supplier, can supply carbon steel and A204 Grade C alloy steel for LNG tanks, pressure vessels, boilers and heat exchangers.