Products Description
Product Specifications
| Standards | ASTM A312, ASTM A269, ASTM A213, ASTM A554, ASTM A778; EN 10217-7, EN 10312, etc. |
| Steel Grades | 304, 304L, 316, 316L, 321, 347, 310S, 904L, 2205, 2507, 409L, 439, 441 and others |
| Manufacturing Type | Seamless / Welded / Cold Drawn / Cold Rolled / Precision Tube |
| Outer Diameter (OD) | 6mm-630mm (seamless),10mm-1800mm (welded), customized |
| Wall Thickness (WT) | 0.5mm-55mm, customized |
| Length | 6 m / 12 m |
| Surface Treatment | Pickled & Passivated, Bright Annealed, 2B cold-rolled and pickled; mechanical polishing/mirror polishing (up to 600#–800#); hairline finish. |
| Production Process | Cold drawing, cold rolling, TIG welding, HFW, ERW, etc |
| Condition | Annealed, solution annealed, cold worked, bright annealed or as specified |
Stainless steel round pipe contains at least 10.5% chromium, which forms a passive oxide layer that protects the surface from corrosion. Grades such as 304/304L are suitable for many general industrial environments, while molybdenum-bearing grades like 316/316L offer superior corrosion resistance in chloride-containing environments. Compared with carbon steel tubing, they reduce corrosion risk and the need for replacement.
Stainless steel round tubes can undergo various processing operations, including cutting, bending, flaring, welding, threading, machining, and subsequent assembly. For customers sourcing these tubes as semi-finished products, consistent outside diameter, wall thickness, and straightness help minimize issues during downstream processing and enhance the consistency of the finished product.
Customized Services
- Custom Sizing: Production of non-standard outer diameters and wall thicknesses based on customer drawings; cut-to-length precision of ±0.05–0.15 mm.
- End Processing: V- or U-shaped weld beveling, end chamfering and deburring, threading (NPT/BSP, etc.), grooving, as well as flaring and swaging.
- Surface Treatment: Bright annealing (BA; Ra ≤ 0.4 μm optional), electropolishing, mechanical mirror polishing, brushed finish, sandblasting, colored vacuum plating, etc.
- Bending and Forming: Cold bending, draw bending, and induction bending; minimum bending radius calculated based on tube diameter and wall thickness.
Chemical Composition
| Element | C max. | Si max. | Mn max. | P max. | S max. | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| 304 | 0.07 | 1.00 | 2.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–11.0 | - |
| 316 | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| 310S | 0.08 | 1.50 | 2.00 | 0.045 | 0.030 | 24.0–26.0 | 19.0–22.0 | - |
| 2205 | 0.030 | 1.00 | 2.00 | 0.030 | 0.020 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 |
Mechanical Properties
| Property | Tensile Strength, min. | Yield Strength, min. | Elongation, min. | Typical Hardness |
|---|---|---|---|---|
| 304 | 515 MPa | 205 MPa | 40% | ≤201 HB |
| 316 | 515 MPa | 205 MPa | 40% | ≤217 HB |
| 310S | 515 MPa | 205 MPa | 40% | ≤217 HB |
| 2205 | 620 MPa | 450 MPa | 25% | Typically ≤293 HB |
Possible Alternative Grades
- For indoor decorative piping, piping for low-temperature non-corrosive fluids, and applications where aesthetic appeal is prioritized over corrosion resistance, 201 or 201LN can be selected as a lower-cost alternative to 304.
- In operating conditions below 1,000°C-such as for boiler components, pressure vessels, and chemical furnace bodies-309S offers performance comparable to 310S but at a significantly lower cost.
- For applications involving direct contact with seawater or high-temperature, high-chloride environments, 2507 super duplex stainless steel can be chosen as an alternative to 2205.
application areas
- Industrial Machinery: Machine frames, protective guards, shafts, rollers, structural components
- Automotive: Exhaust piping, fluid transfer lines, structural tubing, sensor-related components
- Energy & Power: Boiler auxiliary piping, flue gas desulfurization systems, nuclear power auxiliary piping
- Petrochemical & Refining: Process piping, instrumentation tubing, heat exchanger tube bundles, condenser tubes
- Semiconductor & Electronics: High-purity gas delivery lines (BA/EP tubing), ultrapure water piping, LCD manufacturing equipment
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: What is the difference between ASTM A312 and A269? Which should I choose?
A: ASTM A312 is primarily intended for stainless steel process and pressure piping; it offers a wider range of wall thicknesses and is suitable for high-pressure or high-temperature service. ASTM A269 is designed for general-service tubing, commonly used in instrumentation, heat exchangers, and precision systems that require tighter dimensional tolerances and superior surface finishes.
Q: How do I choose between 304 and 316? What is the price difference?
A: Grades 304/304L are suitable for freshwater, indoor, and general atmospheric applications. Grades 316/316L contain approximately 2–3% molybdenum (Mo), providing enhanced resistance to chlorides and pitting corrosion, making them better suited for coastal, marine, chemical, and chloride-rich environments. 316L typically costs about 30–40% more than 304L, depending on the market prices of nickel and molybdenum.
Q: What tests can be performed on stainless steel round pipe?
A: Depending on applicable standards and customer requirements, testing may include chemical composition analysis, tensile testing, hardness testing, eddy current testing, ultrasonic testing, hydrostatic testing, dimensional inspection, and surface inspection.
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