ASTM A249 Tp 304l unlike its parent grade alloy 304, is specifically designed to combat the problems associated with welding. ASTM A249 Tp304l is immune to carbon precipitation at the grain boundary. Apart from its reliability and durability properties, the ASME SA 249 Tp304l is appreciated for being economical as well.
Key sectors such as pharma along with the food and beverage industry favour Stainless Steel 304l Erw piping because they do not react with the various chemical substances present in the product being processed. Also, this partiality is due to the fact that the material used to build A249 304l Erw Tubing is less prone to getting corroded as compared to carbon based steels.
| ASTM/ASME Specification | ASTM A249 / ASME SA 249 TP304L Welded Superheater, Condenser, Hydraulic, Boiler and Heat-Exchanger Tubes |
| Size range | 16, 190.5, 31.8, 25.4, 44.45, 50.8, 38.1, 60.3 mm |
| Thickness | 0.71, 1.0, 1.25, 0.89, 1.65, 1.5, 2.11mm |
| Shapes | SA 249 304L SS Round, Square, Rectangular, Hydraulic, Straight, "U" Tubes, Coiled, Honed, Pan Cake Coils |
| Manufacturing Type | Fabricated / ERW / Welded / CDW / DOM / CEW / 100% X Ray Welded |
| Delivery Condition | Annealed and Pickled (AP), Polished, Bright Annealed (BA), Cold Drawn, MF |
| Surface Finish | BA, 2B, No.4, No.1, No.3, No.8, 8K, HL, 2D, 1D, Mirror Polished, 180G, 320G, 400G Satin/ Hairline, 400G, 500G, 600G or 800G Mirror finish SS UNS S30403 SA 249 Tubing or Custom Finish as per customer's specification |
| Standard | SUS, JIS, AISI, ASTM, GB, DIN, EN |
| Relevant Standard | ASTM A213, ASTM A312, ASTM A269, ASTM A778, ASTM A554, ASTM A249, ASTM A269, ASTM A270, ASTM A789, DIN 17456, DIN17457, DIN 17459, JIS G3459, JIS G3463, GOST9941, EN10216, BS3605, GB13296 |
| Value Added Services |
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| Swg & Bwg | 10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg. |
| END | Plain End, Beveled End, Treaded Stainless Steel 304L SA 249 Tube |
| Processing Service | Bending, Welding, Decoiling, Punching, Cutting, Moulding |
| Technique | JIS SA 249 TP 304L Cold drawn, Cold rolled, Hot rolled, Extrusion Tube |
| SA 249 | Tensile Stress (Mpa) Max | Yield Stress (Mpa) Max | Elongation(%) | Hardness Min |
|---|---|---|---|---|
| TP 304L | 485 | 170 | 35 | 90 |
| 1.4307 | 480-680 | 180 | 40 | 90 |
| SA 249 | C | Mn | P | S | Si | Ni | Cr | N |
|---|---|---|---|---|---|---|---|---|
| TP 304L | 0.035 | 2.00 | 0.045 | 0.030 | 1.0 | 8-13 | 18-20 | |
| 1.4306 | 0.030 | 0.80 | 0.040 | 0.015 | 1.0 | 10-12 | 18-19 | 0.11 |
| 1.4307 | 0.030 | 0.80 | 0.040 | 0.015 | 1.0 | 8-10 | 17.5-19.5 | 0.11 |
| SA 249 | UNS | WNR. / DIN | EN | JIS | GB |
|---|---|---|---|---|---|
| TP 304L | S30403 | 1.4307 | X5CrNi18-10 | SUS304L | 022Cr19Ni10 |
Heat exchanger systems, often require U-bend type stainless steel tubes, U-bending tube has the benefit of saving costs. leg length max 12 meters, radius max 1.5 meters, bending part should be heat treated to relieve stress, then pickling to ensure tube surface clean.
Bright annealing and annealed pickling processes can eliminate the scaling to make the inside and outside surface clean, inert gas hydrogen-air in the closed furnace, then heat treatment improves tube roughness, it makes the tube brighter, when it is installed in heater and cooler system, that will be easy as well as to clean.
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