Stainless steel welded Coiled tube

TOKO TECH offers Stainless steel Coiled tube as following:

Out diameter range: 6mm -60mm

Wall thickness range: 0.6-10mm

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:

​Precision Forming: CNC-coiling machines ensure ±0.5° bend accuracy, wall thinning ≤5%.

​Rigorous QC: Triple inspection (ET+UT+hydro test), ASME Section VIII Div.1 compliant.

​Custom Solutions: OD 10-1000mm, wall thickness 0.5-30mm. Non-standard coils delivered in 20 days.

​Global Support: ANSYS thermal simulation reports, installation guidance, 10-year warranty.

1.Material Options

​304/304L Austenitic Stainless Steel

• ​Composition: 18% Cr, 8% Ni. Resists weak acids, alkalis, and atmospheric corrosion. Excellent post-weld ductility.
• ​Applications: Heat exchanger coils for food processing, refrigeration evaporators. Minimum bend radius ≥2D (tube diameter).

​316/316L Molybdenum-Enhanced Stainless Steel

• ​Composition: 2-3% Mo. Chloride resistance up to 5000 ppm (PREN ≥25).
• ​Applications: Seawater cooling coils, chemical reactor circulation lines. Operating temperature: -50°C to 450°C.

Duplex Steel 2205 (S31803)

• ​Composition: Austenitic-ferritic dual-phase structure. Yield strength ≥450 MPa, resists stress corrosion cracking (SCC).
• ​Applications: High-pressure oil/gas transport coils, acidic fluid heat exchange systems.

​High-Temperature Alloys 800H/310S

• ​Composition: 30% Ni, 20% Cr. Oxidation resistance ≤1100°C with superior creep resistance.
• ​Applications: Pyrolysis furnace coils, gas turbine exhaust heat recovery systems.

​2. Compliance Standards

​International Standards & Certifications

• ​Manufacturing Standards:
  • ​ASTM A312/A358: Governs TIG/Plasma welding with ±0.2mm dimensional tolerance.
  • ​EN 10217-7: EU pressure equipment standard mandates 100% X-ray (RT) weld inspection.
  • ​ASME BPE: Medical-grade coils require internal Ra ≤0.4μm and SIP compatibility.
• ​Certifications:
  • ISO 3834 welding system, PED 2014/68/EU, FDA food-grade compliance, NACE MR0175 (sulfide corrosion resistance).

​Testing Protocols

• ​Non-Destructive Testing: 100% Eddy Current Testing (ET) + Ultrasonic Testing (UT), ≥99% crack detection rate.
• ​Performance Tests: Hydrostatic test (2× working pressure), intergranular corrosion test (ASTM A262).

​3. Surface Treatments

​Acid Pickling & Passivation (AP)

• ​Process: Full immersion pickling removes weld oxides. Passivation layer ≥2nm. Salt spray resistance ≥500 hours.
• ​Applications: Cost-effective chemical industry coils.

​Electropolishing (EP)

• ​Process: Electrochemical polishing achieves Ra ≤0.1μm. Microbial residue <0.05 CFU/cm² (ASME BPE SF-1 compliant).
• ​Applications: Biopharmaceutical and dairy-grade coils, CIP/SIP compatible.

​

Sandblasting + Coating

• ​Process: Alumina grit blasting (Ra 3.2-6.3μm) + PTFE/ceramic coating. Temperature range: -196°C to 260°C.
• ​Applications: Coils for aggressive media (e.g., concentrated H₂SO₄, HF).

​

Bright Annealing (BA)

• ​Process: Hydrogen-protected continuous annealing. Surface finish Ra ≤0.4μm, carbon residue <10 ppm.
• ​Applications: Semiconductor ultra-pure fluid transfer, ultrapure water systems.

​4. Industry-Specific Solutions

​Oil & Gas Industry

• ​Configuration: Duplex 2205 + TIG welding + internal pickling.
• ​Performance: Pressure ≤30 MPa, H₂S corrosion rate ≤01 mm/year.
• ​Case Study: Middle East hydrocracker coils – zero leaks over 10 years.

​Food & Pharma Industry

• ​Configuration: 316L EP coils + automated orbital welding.
• ​Performance: Internal Ra ≤0.2μm, dead volume <0.1%.
• ​Case Study: European vaccine bioreactor coils – FDA 21 CFR Part 177 certified.

​

Power & Energy Industry

• ​Configuration: 310S alloy + internal shot peening.
• ​Performance: Operating temperature 800-1000°C, steam oxidation rate ≤0.03 mm/year.
• ​Case Study: China ultra-supercritical boiler coils – 80,000+ service hours.

​Marine Engineering

• ​Configuration: Super Duplex 2507 + external epoxy coating.
• ​Performance: Cl⁻corrosion resistance ≥25 years, cathodic protection (-800mV to -1100mV).
• ​Case Study: South China Sea cooling coils – 50% lower maintenance costs.

​Environmental Engineering

• ​Configuration: Hastelloy C-276 + PTFE lining.
• ​Performance: Resists 98% H₂SO₄, 40% HF (≤150°C).
• ​Case Study: Hazardous waste acid gas recovery coils – 40% cost savings vs. titanium.