ASME SA213 TP316L Seamless Tube for Heat Exchanger, Boiler & Superheater
ASME SA-213/SA-213M covers seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes. TP316L is UNS S31603, a low-carbon austenitic stainless steel. Typical furnished sizes are 1/2 in. [3.2 mm] inside diameter to 5 in. [127 mm] outside diameter, with 0.015 to 0.500 in. [0.4 to 12.7 mm] minimum or average wall thickness. Tubes may be hot finished or cold finished.
| Grade | UNS | C max | Mn max | P max | S max | Si max | Ni | Cr | Mo |
|---|---|---|---|---|---|---|---|---|---|
| TP316L | S31603 | 0.035 | 2.00 | 0.045 | 0.030 | 0.75 | 10.0-14.0 | 16.0-18.0 | 2.00-3.00 |
Per ASME SA-213/SA-213M Table 2.
| Item | ASME SA-213/SA-213M Requirement for TP316L |
|---|---|
| Heat treatment | Solution treatment at 1900°F [1040°C] min |
| Cooling | Water or other rapid cool |
| Direct quench | Permitted after hot forming if tube temperature is not less than the minimum specified heat-treatment temperature, under 6.2.2 |
| Tensile strength, min | 70 ksi [485 MPa] |
| Yield strength, min | 25 ksi [170 MPa] |
| Elongation in 2 in. [50 mm], min | 35% |
| Hardness, max | 192 HBW / 200 HV / 90 HRB |
| Stage | Requirement |
|---|---|
| Manufacture | Seamless process; hot finished or cold finished |
| Product analysis | One billet or one tube per heat; retest of two additional billets or tubes if needed |
| Tension test | One tube for lots up to 50 tubes; two tubes for lots over 50 tubes |
| Hardness test | Specimens from two tubes per lot |
| Flattening test | One specimen from each end of one finished tube per lot, not the flaring sample |
| Flaring test | One specimen from each end of one finished tube per lot, not the flattening sample |
| Hydrostatic / NDE | Each tube shall receive hydrostatic or nondestructive electric test |
| Surface | Stainless tubes pickled free of scale; bright annealing may replace pickling |
Key control points: maintain solution treatment temperature, use rapid cooling to reduce carbide precipitation risk, and keep heat number and heat-treatment lot traceability. For TP316L, ASME SA-213/SA-213M Table 3 does not list an austenitic grain size requirement.
Yuhong can pair TP316L tubes with tube bundles, U-tubes, finned tubes, tubesheets, baffles, and heads. Within ASME SA-213/SA-213M, related austenitic grades include TP304/304L/304H, TP316/316L/316H, TP321/321H, TP347/347H, and others. For heat-exchanger projects, TP316L can be quoted as straight lengths, U-bends, pickled or bright annealed, with ends prepared as required.
ASME SA213 TP316L tube is used in heat exchangers, boilers, superheaters, condensers, air coolers, pressure vessels, petrochemical plants, power generation, and chemical processing. Its low carbon content and molybdenum addition support use in many corrosive and chloride-bearing service conditions where improved pitting and crevice corrosion resistance is needed.
TP316L has a lower carbon maximum, 0.035%, which helps reduce carbide precipitation during welding or elevated-temperature exposure.
Product analysis, tension, hardness, flattening, flaring, and per-tube hydrostatic or nondestructive electric testing, as required by ASME SA-213/SA-213M.
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