Also referred to as by its trade name UNS S32100, stainless steel grade ASTM A312 Tp321 is a titanium stabilized alloy. The SS 321 Welded Pipe produced under specification ASTM A312 has been designed to resist intergranular corrosion, especially in high temperature settings. At a temperature between 800 to 1500°F, the more conventionally used austenitic stainless steel grades are susceptible to chromium carbide precipitation, unlike the ASTM A312 Gr.Tp321 which has higher creep strength as well as stress rupture properties. In addition, the 321 Stainless Steel Pipe has good toughness properties even at lower temperatures.
The SS 321 Erw Pipe is one of those alloys which cannot be hardened by heat treatment. However, since the alloy is cold worked, these pipes tend to have a much better surface finish along with superior dimensional control. As the alloy is ductile, the A312 Tp 321 can be easily formed into pipes. Moreover, the SA312 Tp321, like most austenitic stainless steel pipes can be easily welded by the conventionally used welding and fabrication techniques. Tests such as transverse or longitudinal tension test, flattening test in tandem with Grain size determination and weld decay tests are to be performed on the ASTM A312 Tp 321.
ASTM A312 TP321 Seamless Pipes
ASTM A312 TP321 Erw / Welded Pipes
| ASTM / ASME Specification | ASTM A312 / ASTM SA 312 |
| Dimensional Standards | ANSI/ASME B36.19M, ANSI/ASME B36.10M |
| Different Types and Shapes | Hydraulic, Square, Hex, Honed, Round, Rectangle |
| Most Common types | 100% X Ray Welded, Seamless, CDW, Fabricated, ERW, Welded |
| Pipe End Types | Plain One End, Plain Both Ends, Bevel small end, Treaded On End, Beveled end, Bevel one end, Bevel large end, Beveled One End, Treaded Both Ends, Bevel both ends |
| Technical Conditions of The Pipe | Cold Drawn, Bright Annealed, Annealed and Pickled, Polished |
| Mechanical Surface Finishing | 2B, No.4, No.1, No.8 Mirror Finish or custom Finish as per customer Requirements |
| Wall Wall Thickness Schedule Chart | SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Other Services we provide |
|
| Marking available for TP321 Pipes |
Marked Pipe Sample: ANSI B36.19 ASTM A312 TP321 12" NB SCH 40S SEAMLESS HEAT NO. XXXX |
| SA 312 TP 321 3 Inch Pipes | Stainless Steel UNS S32100 Dairy Pipes |
| A312 GR TP321 Square Pipes | SS UNS S32100 TP321 Erw Pipes |
| A312 TP 321 Seamless Pipes | Austenitic SS TP321 Polished Pipes |
| TP 321 Stainless Steel Hollow Pipes | ASTM A 312 TP 321 Stainless Steel Schedule 80 Pipes |
| ASTM A312 SS 321 Rectangular Pipes | ASTM A312 GR TP321 Schedule 10 Pipes |
| Austenitic Stainless Steel 321 Round Pipes | A312 Stainless Steel 321 Electropolished Pipes |
| ASTM A312 TP321 Exhaust Pipes | SS UNS S32100 Box Pipes |
| A312 TP321 Schedule 40 Pipes | TP 321 Stainless Steel DIN 1.4541 Water Pipes |
| werkstoff nr. 1.4541 Stainless Steel 321 C Class Pipes | SA312 321 Stainless Steel Threaded Pipes |
| Density | 8.0 g/cm3 |
| Melting Point | 1454 °C (2650 °F) |
| Tensile Strength | Psi - 75000 , MPa - 515 |
| Yield Strength (0.2%Offset) | Psi - 30000 , MPa - 205 |
| Elongation | 35 % |
| Ni | 9 - 12 |
| Cr | 17 - 19 |
| C | 0.08 max |
| N | 0.10 max |
| Fe | Balance |
| Mn | 2 max |
| Si | 0.75 max |
| S | 0.03 max |
| P | 0.045 max |
| Ti | 5xC min 0.60% max |
| MATERIAL | UNS | WERKSTOFF NR. |
| USA | GERMAN | |
| TP321 | S32100 | 1.4541 |
Annealing is available as a means of treating this material for extra corrosion resistance. Annealing is performed by heating up the material up to 1065 degrees Celsius and then water quenching it. This provides maximum corrosion resistance to the products made up this material. In addition to the annealing procedure, the hot bending operation could be performed in the range of 950 -1100 degrees Celsius.
This is not actually a heat treatment to increase any mechanical properties but soon after the hot bending, annealing is performed to make sure that the corrosion resistance properties are restored. The annealing also provides the material with less intergranular corrosion during welding. An oxide layer forms on the surface of the AISI 321 pipe after annealing which acts as a coating against oxidation reactions. Some types of finishing are also available to protect the surface in addition to the heat treatment.
ASTM A312 TP321 TP321H Seamless Stainless Steel Pipes,the grade 321 stainless steel pipe is austenitic steel that is stabilized with titanium. The titanium stabilization provides the material with good corrosion resistance.
