Overview SA 204 Gr A, SA 204 Gr B & SA 204 Gr C
This carbon / molybdenum grade is used almost exclusively in Refinery / Petrochemical applications. The lean alloy characteristics of this grade lends itself to use in pressure vessels, fittings, and custom fabricated pipe and other environments within moderate temperature ranges.
Chemical Requirements
*Elements represented in percentage
| Elements Composition % | ||||
|---|---|---|---|---|
| SA 204 Grade A |
SA 204 Grade B |
SA 204 Grade C |
||
| Carbon, max: | ||||
| up to 1 in. [25 mm] incl. in thickness | 0.18 | 0.20 | 0.23 | |
| Over 1 in. to 2 in [50 mm] incl. in thickness | 0.21 | 0.23 | 0.26 | |
| Over 2 in. to 4 in. [100 mm] incl. in thickness | 0.23 | 0.25 | 0.28 | |
| Over 4 in. [100 mm] incl. in thickness | 0.25 | 0.27 | 0.28 | |
| Manganese, max: | ||||
| Heat analysis: | 0.90 | 0.90 | 0.90 | |
| Product analysis: | 0.98 | 0.98 | 0.98 | |
| Phosphorus, max | 0.025 | 0.025 | 0.025 | |
| Sulfur, max | 0.025 | 0.025 | 0.025 | |
| Silicon: | ||||
| Heat analysis | 0.15-0.40 | 0.15-0.40 | 0.15-0.40 | |
| Product analysis | 0.13-0.45 | 0.13-0.45 | 0.13-0.45 | |
| Molybdenum: | ||||
| Heat analysis | 0.45-0.60 | 0.45-0.60 | 0.45-0.60 | |
| Product analysis | 0.41-0.64 | 0.41-0.64 | 0.41-0.64 | |
Tensile Requirements
| SA 204 Grade A |
SA 204 Grade B |
SA 204 Grade C |
||||
|---|---|---|---|---|---|---|
| ksi | [MPa] | ksi | [MPa] | ksi | [MPa] | |
| Tensile strength | 65-85 | [450-585] | 70-90 | [485-620] | 75-95 | [515-655] |
| Yield strength, min. | 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 | |||