Zhejiang Seamless Pipe Co., Ltd.
| Payment Terms | L/C,D/A,D/P,T/T,Western Union,MoneyGram |
| Supply Ability | 1000 ton/month |
| Delivery Time | 2 weeks/container |
| Packaging Details | Bundles in woven bag/plywood case With plastic end caps |
| Material Grade | S31803 ,2205 etc. |
| Outer Diameter | 1/4" – 24" |
| Package | Woven Bags |
| Process Method | Cold Drawn or Cold Rolled |
| Wall Thickness | Sch5s – XXS |
| Standard | ASTM A790 |
| Brand Name | SMLSCO |
| Certification | ISO PED |
View Detail Information
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Product Specification
| Payment Terms | L/C,D/A,D/P,T/T,Western Union,MoneyGram | Supply Ability | 1000 ton/month |
| Delivery Time | 2 weeks/container | Packaging Details | Bundles in woven bag/plywood case With plastic end caps |
| Material Grade | S31803 ,2205 etc. | Outer Diameter | 1/4" – 24" |
| Package | Woven Bags | Process Method | Cold Drawn or Cold Rolled |
| Wall Thickness | Sch5s – XXS | Standard | ASTM A790 |
| Brand Name | SMLSCO | Certification | ISO PED |
| High Light | 2205 Seamless Stainless Steel Pipe ，UNS S31803 2205 ，ASTM A790 Pipe | ||
| Attribute | Value |
|---|---|
| Material Grade | S31803, 2205 etc. |
| Outer Diameter | 1/4" – 24" |
| Package | Woven Bags |
| Wall Thickness | Sch5s – XXS |
| Standard | ASTM A790 |
| Process Method | Cold Drawn or Cold Rolled |
| Item | Description |
|---|---|
| Material Grade | S31803, 2205 etc. |
| Outer Diameter | 1/4" - 24" |
| Wall Thickness | Sch5s - XXS |
| Length | 6M, 12M, 5-7M random length, According to customer requirements |
| Standard | ASTM A790 etc. |
| Process Method | Cold Drawn or Cold Rolled |
| C | Si | Mn | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|
| 0.03 | 1.00 | 2.00 | 0.03 | 0.02 | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.2 |
| YS(Mpa) | TS(Mpa) | EL | HB |
|---|---|---|---|
| ≥450 | ≥620 | ≥25 | ≤290 |
SMLSCO Quality Control for 31803 Seamless Pipe:
Raw material inspection: Raw materials are sourced from stable suppliers and inspected before production.
Process inspection: Key items such as dimensions, surface condition, and production quality are checked during manufacturing.
100% pre-shipment inspection: Each seamless pipe is inspected before delivery to ensure it meets order and standard requirements.
Traceable quality records: Inspection photos and quality data are recorded in SMLSCO’s quality system for easier traceability.
Certification support: EN 10204 3.1 MTC can be provided, and related products are supported by ISO and PED-certified manufacturing systems.
FAQ
Q1: When welding UNS S31803 / 2205 duplex steel pipes on-site, what specific process requirements must be followed to prevent embrittlement in the weld zone?
A1: 2205 duplex steel requires strict control of heat input and interpass temperature (typically recommended to be kept below 150°C). Excessive or insufficient heat input can disrupt the ideal 50:50 austenite-ferrite microstructural balance, leading to phase embrittlement or reduced corrosion resistance.
Q2: Under what operating conditions should I choose this 2205 duplex seamless pipe instead of traditional 316L austenitic stainless steel pipe?
A2: When your piping system is exposed to environments with high concentrations of chloride ions (such as seawater or high-salinity wastewater), accompanied by high pressure, impact, or thermal stress, 2205 is the better choice. Its yield strength (≥450 MPa) is twice that of 316L, enabling it to withstand higher pressures and allowing for thinner wall designs. Additionally, it has a higher pitting resistance equivalent number (PREN) and significantly outperforms 316L in resisting stress corrosion cracking (SCC) and erosion corrosion.
Q3: What practical impact do the cold-rolled and cold-drawn processes have on the on-site high-pressure installation of this duplex steel pipe?
A3: The cold-rolling process provides tighter wall thickness tolerances and extremely high surface finish, making it ideal for precision ferrule connections such as those in instrumentation piping; the cold-drawing process, on the other hand, excels at producing heavy-duty, thick-walled pipes. Since the seamless process eliminates weld weaknesses, both methods ensure that 2205 demonstrates highly uniform mechanical strength and pressure safety in high-pressure transportation and mechanical structural applications.
Q4: For highly regulated projects such as offshore engineering, how can inspection records be used to mitigate risks associated with overseas audits and acceptance inspections, in addition to standard material certificates?
A4: SMLSCO operates a production system certified to ISO and PED standards. For high-standard projects, in addition to providing EN 10204 3.1 MTCs, we implement three rigorous quality inspections and utilize a dedicated quality record system. We store inspection photos and non-destructive testing (NDT) data—such as eddy current and ultrasonic test results—for each pipe on our servers, allowing customers to trace the records online at any time. This ensures projects pass third-party audits (e.g., SGS/TÜV) or client inspections flawlessly.
Company Details
Business Type:
Manufacturer,Exporter
Year Established:
2006
Employee Number:
100~150
Ecer Certification：
Verified Supplier
Zhejiang seamless pipe co.,ltd. (SMLSCO) is a specialized stainless steel piping systems provider with 19 years of industry experience. We began by supplying cost-effective stainless steel seamless pipes but for now, Smlsco is more than pipes. With 19 years of growth, we have establis... Zhejiang seamless pipe co.,ltd. (SMLSCO) is a specialized stainless steel piping systems provider with 19 years of industry experience. We began by supplying cost-effective stainless steel seamless pipes but for now, Smlsco is more than pipes. With 19 years of growth, we have establis...
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