Boiler steel standard ASTM A299
Boiler steel standard ASTM A299 is an ASTM specification which cover manganese-silicon carbon steel plates for use welded boilers and other pressure vessels. Below are difference between A299Gr.A steel and A299Gr.B boiler steel in chemical composition and mechanical properties.
A299Gr.A and A299Gr.B chemical composition to Boiler Steel Standard ASTM A299
| Steel Grade | C | Si | Mn | P | S |
| A299 Grade A | 0.28-0.30 | 0.13-0.45 | 0.84 -1.62 | 0.035 | 0.035 |
| A299 Grade B | 0.28-0.30 | 0.13-0.45 | 0.84 -1.62 | 0.035 | 0.035 |
A299Gr.A and A299Gr.B mechanical properties to Boiler Steel Standard ASTM A299
| A299 Grade A | t≦50 | 275-290 | 515-655 | 19 |
| 50<t≦200 | 275-290 | 515-655 | 19 | |
| A299 Grade B | t≦50 | 310-325 | 550-690 | 19 |
| 50<t≦200 | 310-325 | 550-690 | 19 |
ASTM A299 Steel Plates Application
A299Gr.A plates and A299Gr.B sheets are widely used for manufacturing pressure and boiler equipments. Plates of ASTM A299 standard under this thickness of 50 mm are normally supplied in as-rolled condition. Plates may be ordered normalized or stress relieved, or both. Plates over 50 mm in thickness shall be normalized.
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