Products Description
Product Specifications
| Standards | ASTM A213 / ASME SA213 |
| Steel Grades | TP309, TP310, TP310S,TP201 TP202 TP304 TP304L TP304H TP309S TP309H TP310S TP316 TP316L TP317 TP321 TP347 TP347H TP348 TP348H TP444 |
| Outer Diameter (OD) |
6mm-127mm |
| Wall Thickness (WT) |
1.0mm-12.7mm |
| Length | 3/6/12m, or customized |
| Surface Treatment | Bright Annealed (BA) |
| Production Process | Cold Drawn |
| Condition | Solution Annealed , BA Finish |
How to Choose Between 309, 309S, 310, and 310S?
| Material | Operating Temperature | Cost | Weldability | Applications |
| 309 | ≤900℃ | Lowest | Intergranular corrosion is susceptible to occurring after welding | Boiler Low-Temperature Section, Normal Operating Conditions |
| 309S | ≤980℃ | Medium | Non-corrosive after welding | Boiler Intermediate Temperature Section |
| 310 | 900~1100℃ | Medium-High | Intergranular corrosion is prone to occur after welding | Boiler High-Temperature Section |
| 310S | ≤1200 ℃ | Highest | Excellent | Extreme High Temperature and High Corrosion |
- Grade 309 features a high carbon content (C ≤ 0.20%), resulting in slightly inferior weldability; it is the preferred choice when there are no strict welding requirements, though it is not recommended for tube bundles requiring frequent welding.
- Grade 309S is a low-carbon variant of 309; it is immune to intergranular corrosion after welding and is suitable for applications involving general flue gas corrosion where welding is required.
- Grade 310 stainless steel has a high carbon content and is priced higher than Grades 309 or 309S; it is suitable for medium-to-high temperature heat exchange environments where welding is not required.
- Grade 310S offers superior overall performance, demonstrating excellent resistance to high temperatures and high-sulfur corrosion. Furthermore, it boasts the best weldability among these grades, making it suitable for complex tube bundle welding, and presents no risk of intergranular corrosion; however, it carries the highest cost.
Customized Services
- TORICH supports custom sizing services, as well as specialized bending processes-such as U-shaped and L-shaped bends-with a minimum bending radius of ≥ 3 times the outer diameter.
- We offer custom end finishing options, including plain ends, beveled ends (30°/45°/60°), threading (NPT/BSPT), and flanged connections.
- Additional services include pickling and passivation, mechanical polishing (180–600 grit), and mirror polishing (Ra ≤ 0.4 μm).
Chemical Composition
| Element | C (%) | Cr (%) | Ni (%) | Mn (%) | Si (%) | P (%) | S (%) |
|---|---|---|---|---|---|---|---|
| TP309 | ≤0.20 | 22.0–24.0 | 12.0–15.0 | ≤2.0 | ≤1.0 | ≤0.045 | ≤0.030 |
| TP310 | ≤0.25 | 24.0–26.0 | 19.0–22.0 | ≤2.0 | ≤1.5 | ≤0.045 | ≤0.030 |
| TP310S | ≤0.08 | 24.0–26.0 | 19.0–22.0 | ≤2.0 | ≤1.5 | ≤0.045 | ≤0.030 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| TP309 | ≥515 | ≥205 | ≥35 | ≤217 |
| TP310 | ≥520 | ≥205 | ≥40 | ≤217 |
| TP310S | ≥515 | ≥205 | ≥40 | ≤217 |
Possible Alternative Grades
- For extremely high-temperature and highly corrosive environments-such as those found in waste incineration boilers or chemical high-temperature reaction heat exchangers-Incoloy 800H is the recommended choice.
- For medium-to-high temperature sulfur-bearing conditions, specifically in applications where operating temperatures range between 900°C and 1000°C, 253MA is a more suitable option.
- For environments containing chlorides and various chemical substances-such as those in chemical processing plants or marine heat exchangers-TP316 or TP316L may be selected; the molybdenum content in these alloys enhances their resistance to pitting and crevice corrosion.
applications areas
309 310 310S Stainless Steel Pipe is primarily utilized in boiler and heat exchanger applications. Within the power generation industry, their specific uses include superheater tube bundles, reheater tube bundles, economizer tube bundles, waterwall tubes, steam transport pipelines, and waste heat recovery heat exchanger tubes, among others.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
We offer a wide range of packaging options, including plastic end caps, woven bags, wooden crates, and iron frames. Custom packaging solutions, logo branding, and other personalized requirements are also available to meet specific customer needs.
FAQ
Q: Are BA-finish stainless steel tubes suitable for welding?
A: Yes, they are suitable for welding-particularly the low-carbon 309S and 310S BA grades-which exhibit excellent weldability and carry no risk of intergranular corrosion after welding.
Q: Compared to pickled and passivated surfaces, what advantages does a BA surface offer in boiler heat exchangers?
A: A BA surface enhances heat transfer efficiency, resists scaling, and offers superior corrosion resistance. Furthermore, it is ideally suited for boiler heat exchange applications requiring high levels of cleanliness, such as those in the pharmaceutical industry.
Q: How should one select the appropriate stainless steel tube grade-from among 309, 309S, 310, and 310S-based on specific boiler heat exchange operating conditions?
A: Selection should be based on operating temperature, corrosive environment, and surface finish requirements: ① For temperatures ≤ 900°C involving exposure to standard flue gas corrosion, select 309 or 309S (prioritizing 309S if welding is required); ② For temperatures between 900°C and 1100°C involving exposure to high-sulfur flue gas corrosion, select 310 BA (if no welding is required) or 310S BA (if welding is required); ③ If welding is necessary and the risk of intergranular corrosion must be avoided, select 309S or 310S.
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