ASTM A269 TP316L seamless tube is austenitic stainless steel tubing, UNS S31603, produced to ASTM A269/A269M with ASTM A1016/A1016M general requirements. It is seamless (SML) with no longitudinal weld. Typical applications include heat exchanger tube bundles, condensers, pressure vessels, air coolers, and U-tube exchangers. The low-carbon TP316L grade has C max 0.035%, supporting corrosive service within design limits.
| Element | TP316L Requirement, % |
|---|---|
| C | 0.035 max |
| Mn | 2.00 max |
| P | 0.045 max |
| S | 0.030 max |
| Si | 0.75 max |
| Ni | 10.0-14.0 |
| Cr | 16.0-18.0 |
| Mo | 2.00-3.00 |
Heat analysis is per A1016/A1016M; product analysis is per A269/A269M when specified.
A1016/A1016M covers manufacture and testing. Steel may be made by any process; primary melting may include degassing/refining, and secondary melting is permitted. Transition material from sequential strand casting of different grades must be removed. Heat analysis is required for each heat.
| Key Requirement | A1016/A1016M Practice |
|---|---|
| Heat analysis | Each heat; secondary melt from one remelted ingot per primary melt |
| Tensile | Per A269/A269M; yield at 0.2% offset or 0.5% total extension |
| Dimensions | Wall, OD, and length per A1016/A1016M tables |
| NDT | After final deformation, heat treatment, welding, straightening |
| Hydrostatic | P = 32000t/D psi or 220.6t/D MPa; hold ≥5 s |
Tensile properties follow A269/A269M; yield strength is determined at 0.2% offset or 0.5% total extension. Wall, OD, and length tolerances follow A1016/A1016M tables. NDT is performed after deformation, heat treatment, welding, and straightening. Hydrostatic testing, when specified, uses P = 32000t/D psi or P = 220.6t/D MPa, held at least 5 s; unless agreed, the minimum required pressure need not exceed 1000 psi [7 MPa]. Flattening, flaring, hardness, and surface requirements apply as specified. Repair welding requires purchaser approval and "WR" marking.
Yuhong Group can match A269 TP316L seamless tubes with heat exchanger and pressure equipment fabrication. Capabilities include tube bundles, U-tubes, fin tubes, tubesheets, baffles, and heads. Common austenitic grades under A269/A269M include TP304/L, TP316/L, TP321, and TP347.
| Capability | Custom Option |
|---|---|
| Heat exchangers, pressure vessels, air coolers | Tube bundles, U-tubes, fin tubes |
| Components | Tubesheets, baffles, heads |
| Tube supply | Seamless TP316L, custom OD/WT/length, U-bent tubes |
| Documentation | Heat analysis, test reports, marking, packaging |
Custom options include: OD, wall, length, U-bend, end finish, marking, and packaging.
Used in heat exchanger tube bundles, condensers, pressure vessels, air coolers, and general corrosive service where A269/A269M is specified. TP316L with Mo 2.00-3.00% is often selected for chemical, petrochemical, power, and marine-related equipment within design limits. For chloride-bearing service, confirm temperature, concentration, and stress with the equipment designer.
