This high-temperature, corrosion-resistant stainless steel tubing for cooling systems conforms to ASTM A213 TP321 standard. It features seamless construction, a 3/4-inch outer diameter, and is available in 20-foot lengths. The TP321 grade indicates that it contains a titanium stabilizer, which provides resistance to intergranular corrosion at high temperatures. The "16 wire diameter" specification is ambiguous and may refer to specific application details, such as perforated or reinforced tubing, which is not a standard size for ASTM A213 pipe.
321 Austenitic Stainless Steel
SA 213 TP 321 is a specification for heat exchanger tubing made from 321 austenitic stainless steel. SA 213 specifies heat exchanger tubing products made from various material grades, including ferritic and austenitic steels.
ASTM A213 TP 321 Seamless Tube Specifications
| Standard | ASTM A213/ASME SA213 |
|---|---|
| Grade | TP321 stainless steel |
| Tube Type | Seamless Tube |
| Finishes | Annealing Pickling Bright Annealing |
| Outside Diameter | 1/8″ – 5″ |
| Thickness | 0.015″ – 0.500″ |
| Length | Fixed And Random Length |
| Application | Boiler, Heat Exchanger, Super Heater |
TP321 Stainless Steel Chemical Composition(%), Max
| C | Si | Mn | P | S | Cr | Ni | Ti | N | Bal | |
|---|---|---|---|---|---|---|---|---|---|---|
| 321 | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 17.0/19.0 | 9.0/12.0 | 5 X C Min – 0.70 Max | 0.10 | Iron |
TP321 Stainless Steel Mechanical Property
| Tensile Strength(Mpa) | Yield Point(Mpa) | Elongation(%) | Hardness(HRB) | |
|---|---|---|---|---|
| 321 | 520 | 205 | 40 | 90 |
Key Features
Material: Stainless steel, specifically grade TP321, an austenitic stainless steel stabilized with titanium to prevent intergranular corrosion.
Specification: ASTM A213, which specifies seamless ferritic and austenitic alloy steel pipe for high-temperature applications such as boilers and heat exchangers.
Construction: Seamless, meaning drawn from solid billet, is considered stronger and more reliable than welded pipe.
Dimensions:
Outer Diameter: 3/4 inch
Length: 20 feet
Wire Diameter: This specification is not standard for ASTM A213 pipe and may indicate specific features, such as wire mesh or reinforcement; confirm with the supplier.
Properties:
Excellent corrosion and oxidation resistance, especially at high temperatures (up to approximately 816°C or 1500°F).
Good mechanical strength and formability.
No post-weld annealing required to prevent intergranular corrosion.
| Tube Sizes for Heat Exchangers & Condensers & Boiler | |||||||||
| Outside Diameter | BWG | ||||||||
| 25 | 22 | 20 | 18 | 16 | 14 | 12 | 10 | ||
| Wall Thickness mm | |||||||||
| 0.508 | 0.71 | 0.89 | 1.24 | 1.65 | 2.11 | 2.77 | 3.40 | ||
| mm | inch | Weight kg/m | |||||||
| 6.35 | 1/4 | 0.081 | 0.109 | 0.133 | 0.174 | 0.212 | |||
| 9.53 | 3/8 | 0.126 | 0.157 | 0.193 | 0.257 | 0.356 | 0.429 | ||
| 12.7 | 1/2 | 0.214 | 0.263 | 0.356 | 0.457 | 0.612 | 0.754 | ||
| 15.88 | 5/8 | 0.271 | 0.334 | 0.455 | 0.588 | 0.796 | 0.995 | ||
| 19.05 | 3/4 | 0.327 | 0.405 | 0.553 | 0.729 | 0.895 | 1.236 | ||
| 25.4 | 1 | 0.44 | 0.546 | 0.75 | 0.981 | 1.234 | 1.574 | 2.05 | |
| 31.75 | 1 1/4 | 0.554 | 0.688 | 0.947 | 1.244 | 1.574 | 2.014 | 2.641 | |
| 38.1 | 1 1/2 | 0.667 | 0.832 | 1.144 | 1.514 | 1.904 | 2.454 | 3.233 | |
| 44.5 | 1 3/4 | 1.342 | 1.774 | 2.244 | 2.894 | 3.5 | |||
| 50.8 | 2 | 1.549 | 2.034 | 2.574 | 3.334 | 4.03 | |||
| 63.5 | 2 1/2 | 1.949 | 2.554 | 3.244 | 4.214 | 5.13 | |||
| 76.2 | 3 | 2.345 | 3.084 | 3.914 | 5.094 | 6.19 | |||
| 88.9 | 3 1/2 | 2.729 | 3.609 | 4.584 | 5.974 | 7.27 | |||
| 101.6 | 4 | 4.134 | 5.254 | 6.854 | 8.35 | ||||
| 114.3 | 4 1/2 | 4.654 | 5.924 | 7.734 | 9.43 | ||||
| Form of Tube: Straight & U-bend & Finned & Coiled | |||||||||
| Stainless Steel Tube: A/SA213, A/SA249, A/SA268, A/SA269, A/SA789, EN10216-5, A/SA688, B/SB163, JIS-G3463, GOST9941-81. | |||||||||
| Carbon &Alloy Steel Tube: A/SA178, A/SA179, A/SA192,A/SA209, A/SA210, A/SA213 | |||||||||
Some of the quality tests carried out by us includes:
| Corrosion Test | Conducted only when specially requested by the client |
| Chemical Analysis | Test done as per required quality standards |
| Destructive / Mechanical Testing | Tensile | Hardness | Flattening | Flare | Flange |
| Reverse-bend and Re. flat tests | Carried out in full compliance with relevant standards & ASTM A-450 and A-530 norms, which ensures trouble-free expansion, welding & use at customers end |
| Eddy Current Testing | Done to detect homogeneities in subsurface by using Digital Flaw-mark Testing System |
| Hydrostatic Testing | 100% Hydrostatic Testing carried out according to ASTM-A 450 norms for checking tube leakage, and biggest pressure we can support 20Mpa/7s . |
| Air Under Pressure Test | To check any evidence of air leakage |
| Visual Inspection | After passivation, every single length of tubes & pipes is subjected to thorough visual inspection by trained staff for detecting surface flaws & other imperfections |
Supplementary Testing : Apart from the above mentioned tests, we also carry out on the manufactured products supplementary testing. The tests conducted under this include:
|
Eddy Current Testing O.P Testing Radiography Testing |
Corrosion Testing Micro Testing Macro Testing |
IGC Testing Ultrasonic testing Liquid Penetrate testing |
Gnee Steel specializes in the production of a wide range of stainless steel products. Gnee Steel's product packaging includes: Steel Strapping: Pipes with an outer diameter of 3 inches or less are typically strapped together with polypropylene film to prevent rust during ocean shipping, and then secured with steel strapping. Wooden Cases/Crates: Pipes are typically packaged in wooden cases or crates to protect the pipes during transportation, especially those that are longer or have larger diameters. Seaworthy Export Packaging: Suppliers typically use standard seaworthy export packaging methods, which may include a variety of materials and techniques to protect the pipes during transportation. Tarpaulin Packaging: This prevents rain, seawater, and other external factors from penetrating the export crates during transportation. Gnee Steel specializes in the production and sale of alloy materials. Gnee Steel's products are widely used in the aerospace, chemical, power, automotive, and nuclear energy sectors, and we can provide customized alloy material solutions based on customer needs. For alloy material pricing or customized alloy material solutions, please contact us for a quote: ru@gneesteelgroup.com
