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Grade | C | Mn | Si | P | S | Remarks |
A179 | ≤0.18 | 0.27–0.63 | ≤0.25 | ≤0.035 | ≤0.035 | Low carbon, heat exchanger tubes |
A192 | ≤0.18 | 0.45–0.65 | ≤0.25 | ≤0.035 | ≤0.035 | High-pressure boiler tubes |
A106 Gr.B | ≤0.30 | 0.29–1.06 | ≥0.10 | ≤0.035 | ≤0.035 | High-pressure boiler tubes |
A210 Gr.A1 | ≤0.27 | ≤0.93 | ≥0.10 | ≤0.035 | ≤0.035 | Boiler & superheater tubes |
A210 Gr.C | ≤0.35 | 0.29–1.06 | ≥0.10 | ≤0.035 | ≤0.035 | Higher strength boiler tubes |
SA178 Gr.A | ≤0.18 | 0.27–0.63 | – | ≤0.035 | ≤0.035 | ERW boiler tubes |
SA214 | ≤0.18 | 0.27–0.63 | – | ≤0.035 | ≤0.035 | Electric-resistance welded tubes |
P235GH | ≤0.16 | 0.60–1.20 | ≤0.35 | ≤0.025 | ≤0.015 | Pressure vessel / boiler |
P265GH | ≤0.20 | 0.80–1.40 | ≤0.025 | ≤0.015 | Higher strength boiler steel |











