A249 TP321 Stainless Steel Welded Tube Bright Annealed HVAC systems
Overview
A249 TP321 is a specification for welded austenitic stainless steel tubes designed for high-temperature and corrosive service. The TP321 designation indicates that the tube is made from Grade 321 stainless steel, which is a stabilized austenitic stainless steel that contains titanium to prevent carbide precipitation during welding, reducing the risk of intergranular corrosion.
When referring to an A249 TP321 welded tube, it means that the tube is fabricated according to the ASTM A249 specification for welded tubes. This specification covers tubes for general corrosion-resistant and low or high-temperature service, such as heat exchangers, condenser tubes, and other industrial applications where elevated temperatures and corrosion resistance are important.
A249 TP321 welded tubes are commonly used in industries such as petrochemical, chemical processing, and power generation where high temperatures and corrosive environments are prevalent. These tubes offer excellent resistance to intergranular corrosion, as well as good mechanical properties at high temperatures.
The welding process used to fabricate A249 TP321 welded tubes can vary, but common methods include TIG (tungsten inert gas) welding, laser welding, and high-frequency welding. Proper welding techniques are essential to ensure the integrity and quality of the welded joints in these tubes.
It is crucial to ensure that A249 TP321 welded tubes meet the requirements of the ASTM A249 specification and are fabricated according to industry standards to ensure their performance and durability in service. Proper selection, installation, and maintenance of A249 TP321 welded tubes are essential to ensure the longevity and reliability of industrial processes that rely on these tubes.
Specification:
| Standards | Welded Tube |
| ASTM | A 249 |
| ASME | SA 249 |
| Product Name | ASTM A249 TP 321 Stainless Steel Welded Tubes |
| Range | 6NB to 1200NB - SCH. 5, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, XXS. |
| In Form of | Round, Square, Rectangle, Oval, Coil, Flexible Pipe, Shaft, ‘U’ Shape, Hydraulic pipe, Honed Tubes |
| In Length of | Standard & Cut length |
| Special Pipes | Fabricated Pipe (with radiography) |
| Value Added Service | Draw & Expansion as per required Size & Length Polish (Electro & Commercial) Heat Treatment Bending Annealed & Pickled Sand Blasting Machining Etc. |
| Material Grade (AISI / TP) | AISI TP 304, TP 304H, TP 304L, TP 304LN, TP 316, TP 316H, TP 316L, TP 316LN, TP TP 316Ti, TP 309, TP 310, TP 317L, TP 321, TP 347, TP 409, TP 410, TP 420, TP 430, TP 446, TP 202 etc. |
| 0cr18N9, 00Cr19Ni10, 0Cr25Ni20, UNS31803, S31500, S32750, 2205, 904L Nickel Alloy 600, 625, 800, 825, 718 |
| TEST CERTIFICATES | MTC, IBR & Third Party Inspection Manufacturer Test Certificate Laboratory Test Certificate from Govt. Approved Lab. Under Third Party Inspection |
| Specialize | Fabricated Pipe Square & Rectangle & Other Odd Size |
| Specification: | ASTM A 269/A 213/ASME SA 213 / EN 10216-5/EN 10305 / NACE MR0175/PED 97/23 EC |
| Maximum service temperature | 50°C / 1205°F |
Chemical composition
| Technical composition (%) | Fe | Cr | Ni | Mn | Si | P | C | S | Ti |
| 321 | min | Bal. | 17 | 9 | - | - | - | - | - | - |
| max | - | 20 | 13 | 2 | 0.75 | 0.03 | 0.08 | 0.04 | 0.04 |
Mechanical properties
| Tensile Strength, Mpa | Yield Strength, Mpa | Elongation, % | Hardness, HRB |
| 515 min | 205 min | 35 min | 90 max |
Application:
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1. Structural and Architectural Applications: Stainless steel welded tubes are often used in construction for architectural elements such as handrails, balustrades, and decorative features due to their aesthetic appeal and corrosion resistance.
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2. Industrial Piping Systems: Stainless steel welded tubes are used in industrial piping systems for transporting fluids, gases, and chemicals. The smooth interior surface of the welded tubes reduces friction and allows for efficient flow of materials.
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3. Automotive Industry: Stainless steel welded tubes are used in exhaust systems, fuel lines, and other components in the automotive industry due to their resistance to heat, corrosion, and mechanical stress.
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4. Food and Beverage Industry: Stainless steel welded tubes are widely used in the food and beverage industry for processing equipment, sanitary piping, and storage tanks due to their hygienic properties and resistance to corrosion.
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5. Heat Exchangers: Stainless steel welded tubes are commonly used in heat exchangers for heating and cooling applications in industrial processes, HVAC systems, and refrigeration units.
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