ASTM A312 TP347 pipe is an austenitic stainless steel pipe specified in the ASTM A312 standard. The addition of niobium ensures excellent performance even in high-temperature, highly oxidizing conditions up to approximately 800°C. It is suitable for applications in high-temperature, highly corrosive environments, such as the petrochemical, chemical, and aerospace industries. TP347 pipe is available in both seamless and welded constructions and exhibits excellent mechanical properties, including toughness and creep strength, at high temperatures. A312 TP347 seamless stainless steel pipe offers enhanced strength and durability. A312 TP347 electric-fusion welded pipe is available in sizes ranging from 6 inches to 100 inches.
Compared with other materials, the stabilization treatment of niobium in ASTM A312 TP347H stainless steel seamless pipe can prevent chromium carbide precipitation during welding or high temperature (450-850 ° C), protect grain boundaries, and enhance the resistance of pipes to intergranular corrosion; ASTM A312 TP347H stainless steel seamless pipes can maintain oxidation resistance and creep strength at high temperatures (≤ 800 ° C), which is superior to ordinary 304/316 stainless steel; TP347H stainless steel seamless pipes have good corrosion resistance to oxidizing media such as nitric acid and organic acids, but should be used with caution in reducing acids such as sulfuric acid and hydrochloric acid.
ASTM A312 Stainless Steel Seamless Pipe Chemical Composition
| SS GRADE |
UNS. |
ASTM A312/SA 312 CHEMICAL COMPOSITION % MAXIMUM | |||||||
|---|---|---|---|---|---|---|---|---|---|
| C | MN | P | S | SI | CR | NI | NB | ||
| TP347 | S34700 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 | 9.0-13.0 |
10 × C% |
| TP347H | S34709 | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 | 9.0-13.0 |
10 × C% |
ASTM A312 TP347/TP347H Stainless Steel Seamless Pipe Mechanical Properties
| SS GRADE | HEAT TREATMENT | Tensile Strength, min ksi [MPa] | Yield Strength, min ksi [MPa] | |
|---|---|---|---|---|
| Cold Finished | Hot Finished | |||
| TP347 |
2000 °F [1100 °C] |
1925 °F [1050 °C] |
75 [515] | 30 [205] |
| TP347H | 2000 °F [1100 °C] | 1925 °F [1050 °C] | 75 [515] | 30 [205] |
Specification Chart of ASTM A312 TP347
| Specification as per American standard | ASTM A312 / ASTM SA312 |
| ANSI Standard | ANSI/ASME B36.19M, ANSI/ASME B36.10M |
| Shapes and Types | Hydraulic, Rectangle, Honed, Square, Hex, Round |
| Available Shapes and Types | ERW, Fabricated, 100% X Ray Welded, CDW, Seamless, Welded |
| Pipe End Finishing | Bevel one end, Bevel large end, Plain One End, Bevel small end, Treaded Both Ends, Beveled end, Plain Both Ends, Bevel both ends, Treaded On End, Beveled One End |
| Types of Delivery Conditions | Annealed and Pickled, Bright Annealed, Polished, Cold Drawn |
| Surface Condition | 2B, No.4, No.1, No.8 Mirror Finish or custom Finish as per customer Requirements |
| Pipe Wall Thickness Chart | SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
The applications of ASTM A312 TP347 stainless steel pipes are vast and varied. They are used in industries such as chemical processing, petrochemicals, power generation, food processing, and many others. In chemical processing industries, these pipes find application in the transfer of acids, alkalis, and other corrosive chemicals. In the food processing industry, they are used in the transfer of edible oils, fats, dairy products, and many others.
To ensure the quality of the pipes, ASTM A312 TP347 goes through several tests such as hydrostatic testing, non-destructive testing, eddy current testing, and many others. These tests help to ensure that the pipes are of the desired quality and free from any defects such as cracks or voids.Mail:es@gescosteel.com
