ASTM A312 TP309S Welded Polished Pipe
Manufacturer of ASTM A312 TP309S Welded Polished Pipe
As a professional stainless steel pipe supplier, GNEE provides a wide range of premium stainless steel tubular products. If you are searching for heat and corrosion-resistant ASTM A312 TP309S stainless steel pipes, we can deliver tailored professional solutions for you.
Our supplied ASTM A312 TP309S polished pipes belong to austenitic stainless steel tubing. They withstand repeated heating cycles under 980℃ and are engineered for high-temperature and corrosive operating environments. With precision polishing treatment, the surface roughness reaches Ra ≤ 0.6 μm, fitting industries with strict cleanliness requirements including food processing, pharmaceuticals and chemical engineering.
Our ASTM A312 TP309S welded stainless steel pipes are fabricated via TIG/MIG welding processes. The uniform, sturdy welds are free of blowhole defects for installation of complex structures. Its high chromium content (22–24%) builds a dense chromium oxide barrier to block oxygen penetration and extend service life steadily. Capable of long-term operation below 980℃, it outperforms regular grades such as TP304 in thermal deformation resistance, ideal for industrial furnace tubes, heat exchangers, incinerators and similar applications.
Why choose GNEE
GNEE applies vacuum smelting technology to achieve precise molybdenum content control, boosting the pitting corrosion resistance by over 20% compared with conventional 316L welded pipes.
Equipped with fully automatic ERW welding machines and integrated online solution treatment, the welding qualification rate reaches ≥99.8%. Our products hold ASME BPVC and PED certifications.
Small-batch customization is available with a minimum order quantity of 10 pieces, including tailored dimensions and customized surface finishing services.
ASTM A312 TP309S Welded Pipe
ASTM A312 TP309S Polished Pipe
ASTM A312 TP309S Welded Mirror Pipe
If you need specific details, please let me know:
What size (NPS) and schedule do you require?
What is the operating temperature or environment of your project?
ASTM A312 TP309 Welded Mirror Pipe Specifications
Chemical Composition of ASTM A312 TP309 tube
The composition of Stainless Steel 309 is carefully balanced to achieve its superior high-temperature oxidation resistance and strength.
| Cr | Ni | Mn | Si | P | S | Fe | C |
| 22.00 - 24.00 | 12.00 - 15.00 | ≤ 2.00 | ≤ 1.50 | ≤ 0.045 | ≤ 0.030 | Bal | ≤ 0.20 |
Mechanical Properties of ASTM A312 TP309 tube
Stainless Steel 309 is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.
| Property | Value (Annealed) |
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 217 HBW |
Physical Properties of ASTM A312 TP309 tube
These physical properties highlight the material's ability to perform reliably under a wide range of conditions.
| Property | Value |
| Density | 7.9 g/cm³ |
| Melting Point | 1400 - 1450 °C approx. |
| Thermal Expansion | 16.5 µm/m·°C (20-100°C) |
| Thermal Conductivity | 14.2 W/m·K (20°C) |
| Modulus of Elasticity | 200 GPa |
| Electrical Resistivity | 0.78 x 10⁻⁶ Ω·m (20°C) |
Grade specifications for 309s grade sS tube
| Properties | Metric | Imperial |
| Thermal expansion co-efficient (@ 0-100°C/32-212°F) | 14.9 µm/m°C | 8.28 µin/in°F |
| Thermal conductivity (@0-100°C/32-212°F) | 15.6 W/mK | 108 BTU in/hr.ft².°F |
ASTM A312 TP309 weld tube price
| Purchase Category | Price Range (USD/kg, FOB China) |
|---|---|
| Bulk Standard Order (≥5t, standard pickled welded pipe) | 5.2~8.6 |
| Custom Small/Medium Batch | 9.0~12.4 |
| Distributor Retail & Trial Order | 12.8~18.5 |
Common Applications of A312 TP309s
1.Furnace & Thermal Processing
Furnace linings, radiant tubes, heat shields, muffle tubes
2.Power Generation
Boiler components, hangers, and thermal oxidizers in coal-fired and biomass plants
3.Petrochemical Industry
Catalytic systems, hot gas handling, and acid processing equipment
4.Automotive & Exhaust Systems
High-temperature exhaust manifolds and thermal reactors
Pipelines for chemical workshops
heating furnace pipelines
heat exchange pipelines
If you need specific details, please let me know:
Are you looking for dimensions, schedules (e.g., Sch 40/80), or seamless vs. welded availability?
Do you need a breakdown of its exact chemical composition limits?
Export Cases
GNEE products are sold to more than 60 countries worldwide. Leveraging TP309S's strengths of adapting to medium and high-temperature working conditions at 900–1050℃, excellent weldability and great sulfidation corrosion resistance, we have delivered industrial projects across multiple regions.
1.Saudi Arabia Refinery Hydrocracking Project
GNEE supplied 22 tons of TP309S welded pipes for high-temperature heat exchange lines. Working at 550–820℃ with sulfur-containing oil media, the grade cut procurement cost by 12% vs TP310S and has run reliably for over 18 months. Full PMI, hydrostatic and UT inspections were completed before FOB delivery.
2.Turkey Thermal Power Flue Gas Pipeline Project
28 tons TP309S pipes serve boiler flue ducts under 800℃ sulfur-laden conditions, extending maintenance intervals from 2 to 4 years. GNEE provided professional on-site welding guidelines for local constructors. All orders adopt moisture-proof export packaging and traceable MTC certificates, available for SGS third-party inspection.
Quality Inspection
GNEE carries out full-process quality control for ASTM A312 TP309S welded ss tubes with strict checks at every stage. Key inspection items cover chemical composition testing, dimensional tolerance verification (outer diameter and wall thickness) and hydrostatic testing. Meanwhile, we supply material certificates and third-party inspection reports to ensure full traceability of the entire quality inspection process.
Wall thickness test
outer diameter test
chemical composition inspection
If you are interested in our product inspection and testing, please click the link below to view our inspection videos and reports.
High-quality packaging
1. Inner protection
Plastic end plugs are fitted to seal tube openings, keeping out dust and preventing deformation from bumps during storage and transit. Each pipe is fully wrapped with rust-proof and moisture-resistant PE film to block sea salt spray and humidity in ocean shipping, avoiding surface tarnishing.
2. Middle reinforcement
Individual pipes or small batches are fitted with cardboard protective strips to eliminate scratches during loading and unloading. Specially beveled and polished pipes are additionally wrapped with soft foam to guard precision machined surfaces.
3. Outer packing
Orders are packed in fumigated solid wood or plywood crates with internal positioning fixtures to avoid shifting and collision in transit. Crates are marked with specifications, batch numbers and destinations, suitable for long-distance ocean and land transportation.
Wooden crate packaging
moisture-proof packaging
plastic wrapping
FAQ
1.What are the properties of 309S stainless steel pipe?
Alloy 309S is an austenitic stainless steel pipe that contains higher levels of chrome and nickel. The addition of nickel and chrome provides improved oxidation in temperatures up to 1830°F. 309S is a low carbon version of 309 and is known for being easy to fabricate and weld by most standard methods.
2.What is the difference between 316 and 309 stainless steel pipe?
The main difference between 309 and 316 stainless steel pipe is that 309 stainless steel pipe is built for high heat and oxidation resistance, while 316 stainless steel pipe is built for superior corrosion and chemical resistance.
3.What are the properties of 309S ss tube?
309S ss tube is a type of austenitic ss with high chromium and nickel contents. The addition of nickel and chromium improves its oxidation resistance at temperatures up to 1830°F (approximately 1000°C).
4.What is better, 304 or 309s stainless steel tube?
Strength and Hardness: 309 stainless steel exhibits higher strength and hardness compared to 304 stainless steel. This attribute makes it a preferred choice for applications where increased strength is necessary, especially in high-temperature settings.
5.What is the difference between 309 and 309S ss tube?
Type 309 stainless steel has a maximum carbon content of 0.20% and exhibits higher creep strength at extremely high temperatures. Type 309S is the low-carbon version, with a maximum carbon content of 0.08%; this lower carbon content minimizes carbide precipitation during welding, thereby reducing the risk of intergranular corrosion and making it more suitable for applications requiring welding.
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