Stainless Steel Welded Straight Pipe

TOKO TECH offers Welded Straight Pipe:

Out diameter range: 6mm -711mm

Wall thickness range: 0.6-80mm

Grade: TP304L/H,TP316L/H/Ti, 321/H, 317L, 347H, 310S, N8904(904L), S31803,S32205,S32750,etc.

Standard: ASTM A312, ASTM A249, ASTM A269,ASTM A790, ASTM A789, GOST9941, EN10217-7,etc.

Surface finish: Annealed &Pickled; bright annealed &Polished

TOKO TECH Core Advantages:

​Superior Weld Quality: Automated TIG/Plasma welding ensures ≥95% base metal strength. 100% NDT.

​Customizable Solutions: OD 6-711mm, wall thickness 0.6-80mm. Fast delivery for non-standard specs.

​Global Compliance: Meets ASME, DIN, JIS standards.

1. Material Options

1.​304/304L Austenitic Stainless Steel

• ​Properties: 18% Cr, 8% Ni. Resists weak acids, alkalis, and atmospheric corrosion. Excellent formability and cost-effectiveness.
• ​Applications: Architectural structures, food-grade pipelines. Operating temperature: -196°C to 400°C.

2.​316/316L Molybdenum-Enhanced Stainless Steel

• ​Properties: 2-3% Mo improves chloride resistance (Cl⁻≤2000 ppm). Suitable for coastal and chemical environments.
• ​Applications: Seawater desalination pipes, pharmaceutical equipment. Post-weld annealing not required.

3.​Duplex Steel 2205 (S32205)

• ​Properties: Austenitic-ferritic structure. Yield strength ≥450 MPa, PREN ≥35. Resists stress corrosion and pitting.
• ​Applications: Oil/gas gathering pipelines, high-salinity media transport.

​4.Special Alloys (904L, 6Mo)

• ​Properties: High Ni/Mo content. Resists concentrated sulfuric/phosphoric acids and mixed acids. Max. temp. ≤600°C.
• ​Applications: Chemical reactor liners, electroplating waste pipes.

​2. Compliance Standards

1. ​International Standards

• ​ASTM A312/A358: Covers TIG/Plasma welding with ±0.2mm dimensional tolerance.
• ​EN 10217-7: EU pressure pipe standard mandates 100% X-ray (RT) weld inspection.
• ​JIS G3448: Specifies weld reinforcement ≤1.5mm for Japanese industrial pipes.
• ​GB/T 12771: Chinese standard for fluid transport pipes, ±10% wall thickness tolerance.

2.​Certifications & Testing

• ​Process Certifications: ISO 3834 welding system, PED 2014/68/EU.
• ​Testing Reports: Weld intergranular corrosion test (ASTM A262), hydrostatic test (1.5× working pressure).

​3. Surface Treatments

1. ​Weld Smoothing

• ​Process: Internal argon shielding + external grinding/polishing. Ra ≤3.2μm for fluid flow optimization.
• ​Applications: Food/pharma-grade pipes compliant with 3-A Sanitary Standards.

2.​Acid Pickling & Passivation (AP)

• ​Process: Full-pipe oxide removal. Passivation layer ≥2nm. Salt spray resistance ≥480 hours.
• ​Applications: Cost-effective industrial pipes.

​3.Electropolishing (EP)

• ​Process: Achieves Ra ≤0.4μm with dense passive layer. Reduces microbial adhesion by 90%.
• ​Applications: Bioreactor tubing, ultrapure water systems.

​    4.Sandblasting & Coating

• ​Process: Alumina grit blasting (Ra 6.3-12.5μm) + epoxy coating (-30°C to 120°C).
• ​Applications: Buried pipelines, chemical corrosion-resistant lines.

​4. Industry-Specific Solutions

1. ​Oil & Gas Industry

• ​Configuration: Duplex 2205 + TIG welding + internal pickling.
• ​Performance: H₂S resistance ≤500 ppm, pressure ≤20 MPa.
• ​Case: Middle East sulfur recovery pipeline – 10+ years service.

​ 2.Food & Beverage Industry

• ​Configuration: 316L EP pipes + auto TIG welding.
• ​Performance: Internal Ra ≤0.4μm, CIP cleaning compatible.
• ​Case: European dairyfilling line – passed FDA surprise audit.

3.​Architectural Design

• ​Configuration: 304 mirror-polished (8K) + laser welding.
• ​Performance: Seamless welds, wind load resistance ≥2.5 kPa.
• ​Case: Shanghai landmark curtain wall supports – rust-free for 15 years.

4.​Environmental Engineering

• ​Configuration: 6Mo alloy + sandblasted coating.
• ​Performance: Resists 98% sulfuric acid.
• ​Case: Hazardous waste acid lines – 40% cost savings vs. titanium.

​5.Marine Engineering

• ​Configuration: Super Duplex 2507 + cathodic protection.
• ​Performance: Cl⁻corrosion resistance ≥25 years.
• ​Case: South China Sea cooling system – 3× longer maintenance intervals.

6.​Automotive Manufacturing

• ​Configuration: 304 precision pipes + internal BA finish.
• ​Performance: Tolerance ±0.1mm.
• ​Case: EV battery cooling lines – leakage rate ≤0.01%.