ASTM A778 TP321Annealed Pickled Stainless Steel Welded Pipe
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ASTM A778, the standard specification for welded pipe, covers straight and spiral butt-welded unannealed austenitic stainless steel tubular products suitable for low- to moderate-temperature and corrosive service without corrosion-resistant treatment. The tubular products shall be made from flat-rolled plate, coil, or plate using the shielded arc welding process.
Our ASTM A778 TP321 annealed pickled stainless steel welded pipe is corrosion-resistant and welded from titanium-stabilized stainless steel strip (specifically, grade TP321). The "annealed pickled" finish is a heat treatment and surface treatment that enhances corrosion resistance. TP321 SS pipe is suitable for low- to medium-temperature applications, particularly where corrosion resistance is required after welding. However, it is not suitable for high-pressure applications requiring post-weld heat treatment or radiographic inspection, especially those not subject to high stresses or temperatures up to 1500°F (750°C). If post-weld heat treatment or radiographic inspection is required, choose seamless ASTM A312/A358.
ASTM A778 TP321 Annealed Pickled Stainless Steel Welded Pipe Specification
| Tube Sizes | 3 In (75 mm) To 48 In (1200 Mm) Od – 0.062 In (1.5 Mm) To 0.5 In (12.5 Mm) Wall Thickness |
| Grades |
ASTM A778 TP304L ASTM A778 TP316L ASTM A778 TP317L ASTM A778 TP321 ASTM A778 TP347 |
| Length | 10 Ft (3 M) Lengths Or Over. |
| Length Tolerances | No Tube Shall Be More Than 0.25 In (6 Mm) Over That Specified. No Tube Shall Be Shorter Than Specified. |
| Straightness | 0.25 In (6 Mm) Max Deviation From 10 Ft (3 M) Straight Edge. |
ASTM A778 TP321 Welded Pipe Chemical Composition
| Element | Content Range (wt%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | 2.00 - 2.50 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 17.00 - 19.00 |
| Nickel (Ni) | 9.00 - 12.00 |
| Titanium (Ti) | 5x[C] to 0.70 |
| Nitrogen (N) | ≤ 0.10 |
ASTM A778 TP321 Stainless Steel Welded Pipe Mechanical Properties
| Property | Requirement |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% (in 50 mm) |
| Hardness | ≤ 92 HRB |
| Impact Toughness | ≥ 150 J (at -196°C) |
ASTM A312 Vs ASTM A778
A778 is suitable for small bore thin walled piping applications and A312 is used for large bore and higher pressure
ASTM A778 and A312 Pipes are available in schedule 5S, 10S, 40S, 80S, STD and XS in wall thickness (WT)
A778 Fabrication is better compared to ASTM A312
Requirement of ASTM A778 Pipe Mechanical Testing
| Test | United | ASTM |
| Flare | Required | Not Required |
| Flatten | Required | Required |
| Reverse Bend | Required | Not Required |
| Eddy Current | Required | Not Required |
| Transverse | ||
| Tension | Required | Required |
If you have project requirements for 321 stainless steel welded pipe, please feel free to place an order. GNEE maintains a large inventory of popular products for your selection. Available in both hot-rolled and cold-rolled forms, contact our factory for detailed chemical composition and free samples. We offer competitive pricing and excellent service.Email: info@gneestainless.com
Packaged in waterproof paper and steel strapping, our products meet standard export seaworthy packaging requirements and are suitable for various shipping methods. Custom packaging is also available upon request.
