ASTM A268 TP430 Ferritic Stainless Steel Seamless Pipes
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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 Chemical Composition
| Grade: | TP410 | TP430 | TP439 |
| UNS | S41000 | S43000 | S43035 |
| C, Max | 0.15 | 0.12 | 0.07 |
| Mn,Max | 1 | 1 | 1 |
| P, Max | 0.04 | 0.04 | 0.04 |
| S, Max | 0.03 | 0.03 | 0.03 |
| Si, Max | 1 | 1 | 1 |
| 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 Mechanical Properties
| 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 |
ASTM A268 TP430 Physical Properties
| Density, g/cm3 (lb/in.3) | 7.8 (0.28) |
| Melting point, °C (°F) | 1425-1510 (2600-2750) |
| Specific heat capacity, J/kg · K (Btu/lb · °F) | 460 (0.11) at 0-100 °C (32 to 212 °F) |
| Electrical resistivity, μΩ·m | 0.60 at 20 ℃ |
| 430 stainless steel magnetic permeability | 600-1100 (Approximate) |
| Elastic modulus (Modulus of elasticity), GPa (106 psi) | 200 (29.0) |
| Thermal diffusivity, mm2/s | 7.3 |
| Thermal conductivity, W/m · K (Btu/ft · h · °F) | 26.1 (15.1), at 100 ℃ (212 °F) |
| 26.3 (15.2), at 500 ℃ (932 °F) |
| Coefficient of thermal expansion, μm/m · °C (μin./in. · °F) | 10.4 (5.8), at 0-100 ℃ (32-212 °F) |
| 11.0 (6.1), at 0-315 ℃ (32-600 °F) |
| 11.4 (6.3), at 0-538 ℃ (32-1000 °F) |
SS430 Stainless Steel Heat Treatment
- Annealing: Recommended annealing treatment for 430 steel is 705-790 °C (1300-1450 °F).
- Forging: Typical forging temperature for SS430 is 815-1120 °C (1500-2050 °F).
Heat Resistance
| Maximum service temperatures, °C (°F) |
| AISI | Intermittent service | Continuous service |
| 430 | 870 (1600) | 815 (1500) |
Advantage
High-temperature resistance: ASTM A268 TP430 seamless tubes can withstand high temperatures up to 815°C (1500°F) without losing their strength and corrosion resistance.
Corrosion resistance: ASTM A268 TP430 seamless tubes have excellent corrosion resistance, making them suitable for use in harsh environments where corrosion is a concern.
Cost-effective: Compared to other stainless steel grades, ASTM A268 TP430 seamless tubes are relatively inexpensive, making them a cost-effective option for many applications.
Easy to fabricate: ASTM A268 TP430 seamless tubes are easy to fabricate and can be welded, bent, and formed into various shapes and sizes.
Low maintenance: ASTM A268 TP430 seamless tubes require minimal maintenance, making them an ideal choice for applications where downtime and maintenance costs need to be minimized.
SS430 Stainless Steel Applications
- Cookware and tableware
- Worktable
- Automotive trim
- Air Filter
- Barbecue (BBQ) Grill
- Wall Mount Hood
- Kitchen Exhaust Hood
- Flanges
- Bolts
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ASTM A268 TP430 Ferritic Stainless Steel Seamless Pipe NDT Available Images
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