Stainless steel seamless Coiled tubing

TOKO TECH Seamless Stainless Steel Coils – Precision Engineered for Global Industries. 

TOKO TECH offers Seamless Stainless Steel Coils as following：

1. Size range: O.D.:6.35-50.8mm, W.T.: 0.7-4.0mm

2. Length: according to client’s requirement, max up to 1000meters

3. Standard: ASTM A213, ASME SA213, ASTM A269

4. Grade: TP304 Seamless coiled tube, TP304L Seamless Coiled tube, TP316L seamless Coiled  tube, TP316 Seamless Coiled  tube, TP321 seamless Coiled tube

5. Finished: Bright annealed

1. Material Options

​304/304L Austenitic Stainless Steel

​Properties: 18% Cr, 8% Ni. Excellent general corrosion resistance and low-temperature ductility. Bend radius ≥2× tube diameter.

​Applications: Food processing coils, refrigeration evaporators.

​316/316L Molybdenum-Enhanced Stainless Steel

​Properties: 2-3% Mo improves chloride resistance (Cl⁻≤8000 ppm). Ideal for seawater cooling coils and chemical reactors.

​Applications: Marine and acidic/alkaline media environments.

​Duplex Steel 2205 (S31803)

​Properties: Austenitic-ferritic structure. Yield strength ≥450 MPa, resists stress corrosion cracking (SCC).

​Applications: High-pressure heat exchangers for oil/gas fields, acidic fluid circulation systems.

​High-Temperature Alloy 800H/801H

​Properties: 30% Ni, 20% Cr. Oxidation resistance ≤1100°C, superior anti-carburization.

​Applications: Pyrolysis furnace coils, gas turbine exhaust heat exchangers.

​2. Compliance Standards & Certifications

​Manufacturing Standards

​ASTM A312/A269: Dimensional tolerance (±0.15mm) and mechanical properties for seamless coils.

​EN 10216-5: EU pressure equipment standard, limits wall thinning at bends to ≤10%.

​ASME SB-622: Specifies grain size (ASTM 5-8) for high-temperature alloy coils.

​Testing & Certifications

​Non-Destructive Testing: 100% Eddy Current (ET) + Ultrasonic Testing (UT), compliant with ISO 10893-10.

​Certifications: PED 2014/68/EU, NACE MR0103 (sulfide stress corrosion), FDA food-grade compliance.

​3. Surface Treatments

​Acid Pickling & Passivation (AP)

​Process: Nitric-hydrofluoric acid treatment achieves Ra ≤1.6μm, salt spray resistance ≥500 hours.

​Applications: Cost-effective industrial coils.

​Electropolishing (EP)

​Process: Electrochemical polishing to Ra ≤0.1μm, microbial residue <0.05 CFU/cm² (ASME BPE SF-2).

​Applications: Biopharmaceutical and dairy-grade coils, SIP-compatible.

​Bright Annealing (BA)

​Process: Hydrogen-protected annealing for oxide-free surface (Ra ≤0.4μm).

​Applications: Semiconductor cooling coils, ultra-pure water systems.

​Sandblasting & Coating

​Process: Alumina grit blasting (Ra 3.2-6.3μm) + PTFE/ceramic coating (-50°C to 260°C).

​Applications: Aggressive media (e.g., concentrated H₂SO₄, HF) transfer coils.

​4. Selection Guidelines

​Industry-Specific Recommendations

​Petrochemical Industry:

​Material: Duplex 2205 (H₂S resistance), Alloy 800H (high-temperature).

​Process: AP + external sandblasting; bend radius ≥4D.

​Food & Beverage:

​Material: 316L electropolished coils.

​Process: Internal Ra ≤0.2μm, 3-A Sanitary Standard compliance, CIP cleaning support.

​Power & Energy:

​Material: 310S (boiler coils), Inconel 625 (ultra-supercritical units).

​Process: Internal shot peening for steam oxidation resistance ≤0.05mm/year.

​Marine Engineering:

​Material: Super Duplex 2507.

​Process: External epoxy coating + sacrificial anode protection; ≥20-year seawater corrosion resistance.

​Operational Parameter-Based Selection

​Pressure Rating:

​Low Pressure (≤5MPa): Thin-wall (δ=1-3mm), 304/316.

​High Pressure (≥15MPa): Thick-wall (δ≥5mm), Duplex/High-Temp alloys; 100% RT required.

​Temperature Range:

​Cryogenic (-196°C to 200°C): 304L/316L (avoids brittle fracture).

​High Temp (500-1100°C): Alloy 800H/601 (controls grain growth/carbide precipitation).

​Media Corrosivity:

​Mild (pH 4-10): 304 AP coils.

​Strong Acids/Alkalis: Hastelloy C-276 or titanium coils.

​Design-Driven Selection

​Coil Diameter & Pitch:

​Compact: Diameter ≤25mm, pitch ≤50mm (space-constrained systems).

​Standard: Diameter 25-100mm, pitch 50-200mm (90% industrial use cases).

​Connection Types:

​Flanged: DN15-DN300, PN10-PN40.

​Welded: Bevelled ends with internal argon shielding for oxidation-free welds.

​5. TOKO TECH Core Advantages

​Speed: Fully automated lines support 72-hour urgent orders (standard materials). OD range: 6-800mm.

​Rigorous QC: Triple inspection (ET+UT+hydrostatic testing), compliant with API 5L/ASME.

​Custom Solutions: Non-standard designs: Special ports, multi-layer coils, coatings

TOKO TECH maintains technical rigor while optimizing readability for global clients. For engineering support, contact our team for tailored solutions.