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ASTM A161 Low Carbon Seamless
This specification covers minimum-wall-thickness, seamless, hot-finished and cold-finished, low-carbon and carbon-molybdenum steel still tubes, for use in carrying fluids at elevated temperatures and pressures in various types of heaters, in which the tubes may be subjected to furnace temperature higher than that of the contained fluid.
Description
1.Chemical composition
| grade | Mfg process | C | Si | Mn | P | S | Ni | Cr | Mo | other |
low- carbon | s | 0.10-0.20 | 0.25max | 0.30-0.80 | 0.048max | 0.058max | - | - | - | - |
| Gr.T1 | s | 0.10-0.20 | 0.10-0.50 | 0.30-0.80 | 0.045max | 0.058max | - | - | 0.44-0.65 | - |
2.Chemical Requirements Brinel
| element | composition % | |
| low-carbon steel tubes | Grade T1 | |
| carbon | 0.10-0.20 | 0.10-0.20 |
| manganese | 0.30-0.80 | 0.30-0.80 |
| phosphorus max | 0.035 | 0.025 |
| sulfur max | 0.035 | 0.025 |
| silicon | 0.25 max | 0.10-0.50 |
| molybdenum | ... | 0.44-0.65 |
3.Hardness number
| Low carbon steel tubes | ||
| Steel tubes | Grade T1 | |
| hot-rolled tubes | 137 | 150 |
| cold-finished tubes | 125 | 137 |
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