ASTM A312 TP321 stainless steel pickled seamless pipe
ASTM A312 TP321 stainless steel pickled seamless pipe
ASTM A312 TP321 pickled pipe is a titanium-stabilized austenitic stainless steel pipe with excellent resistance to high-temperature intergranular corrosion, as well as high creep strength and stress-rupture properties. The addition of titanium prevents the formation of chromium carbides, which is critical for high-temperature applications. "Seamless" indicates the absence of welds, providing excellent load-carrying capacity; "pickled" indicates the pipe surface has been treated with an acid solution to remove oxides, resulting in a cleaner, smoother, and more corrosion-resistant surface.
What are the specifications for SS 316 seamless pipe?
316 stainless steel pipe has a minimum tensile strength of 515 MPa and a minimum yield strength of 200 MPa. Its density is as high as 8,000 kg/m³. Standard wall thicknesses for these pipes range from 0.5 mm to 6.35 mm. SS 316 seamless pipe does not have fillet welds.
ASTM A312 Stainless Steel Seamless Pipe Chemical Composition
| GRADE |
UNS. |
ASTM A312/SA 312 CHEMICAL COMPOSITION % MAXIMUM | |||||||
|---|---|---|---|---|---|---|---|---|---|
| C | MN | P | S | SI | CR | NI | Ti | ||
| TP321 | S32100 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 | 9.0-12.0 |
5 × (C+N) min, 0.70 max |
| TP321H | S32109 | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 | 9.0-12.0 |
4(C+N) min; 0.70 max |
ASTM A312 TP321 seamless stainless steel pipe is a high-performance, versatile pipe used in a wide range of industries. Available in a wide range of sizes, with outer diameters typically ranging from 6 mm to several hundred millimeters, and a wide range of wall thicknesses. Its production adheres to the ASTM A312 standard, ensuring product quality and performance meet international standards.
ASTM A312 TP321 seamless stainless steel pipe is primarily composed of chromium (Cr), nickel (Ni), and a small amount of titanium (Ti). The addition of these elements imparts unique properties to the pipe:
Chromium (Cr): Significantly improves the material's corrosion resistance, effectively resisting attack by various corrosive media.
Nickel (Ni): Enhances the material's toughness and resistance to high-temperature oxidation.
Titanium (Ti): As a stabilizing element, it effectively prevents the precipitation of chromium carbides during welding, thereby preventing intergranular corrosion in the weld and heat-affected zone, and ensuring the overall stability of the pipe's performance.
ASTM A312 TP321 stainless steel seamless pipe maintains excellent corrosion resistance in various harsh environments such as high temperature and high pressure, including corrosive media such as acids, alkalis, and salts. The high nickel content enables TP321 stainless steel seamless pipe to maintain high strength and toughness under high temperature conditions. At the same time, the addition of titanium makes TP321 stainless steel seamless pipe less prone to cracking and embrittlement during welding, making it easy to process and weld, ensuring the quality and reliability of the welded joints. The austenitic structure gives the pipe excellent mechanical properties, providing sufficient strength to withstand working pressure while also having good toughness.
ASTM A312 TP321/TP321H Stainless Steel Seamless Pipe Mechanical Properties
| SS GRADE | HEAT TREATMENT | Tensile Strength, min ksi [MPa] | Yield Strength, min ksi [MPa] | |
|---|---|---|---|---|
| Cold Finished | Hot Finished | |||
| TP321 |
2000 °F [1100 °C] |
1925 °F [1050 °C] |
75 [515] | 30 [205] |
| TP321H | 2000 °F [1100 °C] | 1925 °F [1050 °C] | 75 [515] | 30 [205] |
ASTM A312 TP321 Seamless Stainless Steel Pipe Applications
Oil and Gas Industry: ASTM A312 TP 321 seamless stainless steel pipe is becoming an ideal choice for oil and gas transmission pipelines, refinery process piping, and offshore platforms.
Chemical Industry: TP321 seamless stainless steel pipe is widely used in the manufacture of chemical equipment, piping systems, and storage tanks to meet high corrosion resistance requirements.
Nuclear Energy: TP321 seamless stainless steel pipe has become a key material for primary and secondary systems in nuclear power plants.
Aerospace: TP321 seamless stainless steel pipe is used in the manufacture of critical components such as aircraft engine parts, fuel systems, and heat exchangers.
Food Processing: Due to its smooth inner surface, non-toxicity, and easy-to-clean properties, TP321 seamless stainless steel pipe has become the material of choice for food processing equipment, piping, and containers.
Gnee Steel specializes in the production and sale of a wide range of stainless steel products, including 304, 316, 321, 904, 904L, 2205 Duplex, 2205 Duplex, and 316L stainless steel. Gnee Steel's products are widely used in the kitchen, aerospace, chemical, power, automotive, and nuclear energy sectors. We also provide custom stainless steel solutions tailored to customer needs. For stainless steel pricing or custom alloy solutions, please email ru@gneesteelgroup.com for a quote.
