ASTM A268 TP430 Ferritic and Martensitic Seamless Cold Drawn Tube For General Service
ASTM A268 TP430 Ferritic and Martensitic Seamless Tube For General Service
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ASTM A268 is Standard specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service, the grades contain TP410, TP405, TP420, TP430, TP430Ti, TP403, TP409, TP444, TP439 and TP446, it covers standard specification for a number of grades of nominal-wall-thickness, welded ferritic and martensitic stainless steel tubing for general corrosion-resisting and high-temperature service, ASME SA268 is alternative standard.
The tubes shall be made by the seamless or welded process with no filler metal added, tubes shall be reheated to a temperature of 1200.F [650.C] or higher and cooled to meet the requirements of this specification, All tubes shall be free of excessive mill scale, suitable for inspection. A slight amount of oxidation will not be considered as scale.
ASTM A268 TP410, TP430, TP439 Chemical Composition
The steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, aluminum, copper, nitrogen, titanium, and columbium, most of these grades are commonly characterized by being ferromagnetic.
| Grade: | TP410 | TP430 | TP439 |
|---|---|---|---|
| UNS | S41000 | S43000 | S43035 |
| C, Max | 0.15 | 0.12 | 0.07 |
| Mn,Max | 1.00 | 1.00 | 1.00 |
| P, Max | 0.04 | 0.04 | 0.040 |
| S, Max | 0.03 | 0.03 | 0.030 |
| Si, Max | 1.00 | 1.00 | 1.00 |
| Ni | … | … | 0.50max |
| Cr | 11.5-13.5 | 16.0-18.0 | 17.00-19.00 |
| Mo | … | … | … |
| Al | … | … | 0.15 |
| Cu | … | … | … |
| N | … | … | 0.04 |
| Ti | … | … | 0.20+4(C+N)Min, 1.10max |
ASTM A268 Stainless Steel Tubing Sizes Tolerance
Variations in outside diameter, wall thickness, and length from those specified shall not exceed the amounts prescribed below.
| Outside Diameter, In.[Mm] | OD Tolerance, In.[Mm] | Wall Thickness, % | Thin Wall Tubes |
|---|---|---|---|
| Up To1⁄2, [12.7], Excl | ±0.005 [0.13] | ±15 | |
| 1⁄2 To 11⁄2 [12.7 To 38.1], Excl/Td> | ±0.005 [0.13] | ±10< | Less Than 0.065 In. [1.6 Mm] Nominal |
| 11⁄2 To 31⁄2 [38.1 To 88.9], Excl | ±0.010 [0.25] | ±10 | Less Than 0.095 In. [2.4 Mm] Nominal |
| 31⁄2 To 51⁄2 [88.9 To 139.7], Excl | ±0.015 [0.38] | ±10 | Less Than 0.150 In. [3.8 Mm] Nominal |
| 51⁄2 To 8 [139.7 To 203.2], Incl | ±0.030 [0.76] | ±10 | Less Than 0.150 In. [3.8 Mm] Nominal |
TP410, TP430 And TP439 Properties
The steel shall conform to the following tensile properties: tensile strength, yield strength, and elongation.
| Grade | Tensile Strength, Min, Ksi [MPa] | Yield Strength, Min, Ksi [MPa] | ELONGATION. MIN, % |
|---|---|---|---|
| TP410 | 55 [380] | 30 [205] | 20 |
| TP430 | 60 [415] | 35 [240] | 20 |
| TP439 | 60 [415] | 30 [205] | 20 |
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