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UNS S32750 / EN 1.4410 / ASTM A789/A790 Seamless Coiled Tubing
Shanghai Toko Tech Co., Ltd. is a professional manufacturer and supplier of high-performance special alloy pipes and components. Its 2507 (UNS S32750) seamless coiled tubing is a super duplex stainless steel that represents the premium grade of duplex alloys, offering exceptional strength and outstanding corrosion resistance—particularly in aggressive chloride-containing environments.
Key Features & Advantages:
- Exceptional Strength: Possesses very high mechanical strength (approximately 2-3 times the yield strength of standard 300-series austenitic stainless steels), allowing for significant weight reduction and thickness optimization in pressure systems.
- Outstanding Corrosion Resistance: With a high Pitting Resistance Equivalent Number (PREN >42), it offers superior resistance to pitting, crevice corrosion, and erosion-corrosion, especially in chloride-rich environments like seawater.
- Excellent Stress Corrosion Cracking (SCC) Resistance: Provides exceptional resistance to chloride-induced stress corrosion cracking, a common failure mode for standard stainless steels.
- Good Resistance to Acids: Performs well in both oxidizing and reducing acidic media.
- Seamless & Continuous Length: The seamless structure ensures maximum integrity for high-pressure and critical applications. The long coiled length eliminates potential weak points from welds and simplifies installation.
Material Composition (Chemical Requirements per ASTM A789/A790):
The exceptional properties of 2507 are derived from its carefully balanced chemical composition. The typical composition ranges are shown in the table below.
Typical Specifications (Customizable):
- Material Grade: UNS S32750 / EN 1.4410 / ASTM A789/A790
- Outer Diameter (O.D.): φ3mm ~ φ22 mm (Common range for coils)
- Wall Thickness (W.T.): 0.8mm ~ 5 mm (Varies with O.D.)
- Coil Length: Several hundred meters per continuous coil (exact length depends on O.D. and W.T.)
- Standard: ASTM A789, ASTM A790, etc.
Primary Applications:
This premium tubing is designed for the most demanding applications where standard stainless steels and even duplex 2205 are inadequate:
- Oil & Gas (Upstream): Downhole tubing, flow lines, and components in sour (H₂S/CO₂) and ultra-high-chloride environments.
- Sea Water Cooling Systems: Heat exchanger tubes, water boxes, and piping in offshore platforms and coastal plants.
- Chemical Process Industry (CPI): Equipment handling highly aggressive chemicals, especially chlorides and acids.
- Desalination Plants: High-pressure RO tubes and other critical components.
- Pollution Control Equipment: Scrubbers and systems handling corrosive effluents.
| frome ASTM 790 | ||||||||||||
| TABLE 2: Chemical RequirementsA | ||||||||||||
| UNS DesignationB | TypeC | C (max) | Mn (max) | P (max) | S (max) | Si (max) | Ni | Cr | Mo | N | Cu | Other Elements |
| S31200 | 0.03 | 2 | 0.045 | 0.03 | 1 | 5.5 – 6.5 | 24.0 – 26.0 | 1.20 – 2.00 | 0.14 – 0.20 | … | … | |
| S31260 | 0.03 | 1 | 0.03 | 0.03 | 0.75 | 5.5 – 7.5 | 24.0 – 26.0 | 2.5 – 3.5 | 0.10 – 0.30 | 0.20 – 0.80 | W 0.10 – 0.50 | |
| S31500 | 1.20 – 2.00 | 0.03 | 0.03 | 1.40 – 2.00 | 4.2 – 5.2 | 18.0 – 19.0 | 2.50 – 3.00 | 0.05 – 0.10 | … | … | ||
| S31803 | 0.03 | 2 | 0.03 | 0.02 | 1 | 4.5 – 6.5 | 21.0 – 23.0 | 2.5 – 3.5 | 0.08 – 0.20 | … | … | |
| S32003 | 0.03 | 2 | 0.03 | 0.02 | 1 | 3.0 – 4.0 | 19.5 – 22.5 | 1.50 – 2.00 | 0.14 – 0.20 | … | … | |
| S32101 | 0.04 | 4.0 – 6.0 | 0.04 | 0.03 | 1 | 1.35 – 1.70 | 21.0 – 22.0 | 0.10 – 0.80 | 0.20 – 0.25 | 0.10 – 0.80 | … | |
| S32202 | 0.03 | 2 | 0.04 | 0.01 | 1 | 1.00 – 2.80 | 21.5 – 24.0 | 0.45 | 0.18 – 0.26 | … | … | |
| S32205 | 2205 | 0.03 | 2 | 0.03 | 0.02 | 1 | 4.5 – 6.5 | 22.0 – 23.0 | 3.0 – 3.5 | 0.14 – 0.20 | … | … |
| S32304 | 2304 | 0.03 | 2.5 | 0.04 | 0.04 | 1 | 3.0 – 5.5 | 21.5 – 24.5 | 0.05 – 0.60 | 0.05 – 0.20 | 0.05 – 0.60 | … |
| S32506 | 0.03 | 1 | 0.04 | 0.015 | 0.9 | 5.5 – 7.2 | 24.0 – 26.0 | 3.0 – 3.5 | 0.08 – 0.20 | … | W 0.05 – 0.30 | |
| S32520 | 1.5 | 0.035 | 0.02 | 0.8 | 5.5 – 8.0 | 24.0 – 26.0 | 3.0 – 5.0 | 0.20 – 0.35 | 0.5 – 3.00 | … | ||
| S32550 | 255 | 0.04 | 1.5 | 0.04 | 0.03 | 1 | 4.5 – 6.5 | 24.0 – 27.0 | 2.9 – 3.9 | 0.10 – 0.25 | 1.50 – 2.50 | … |
| S32707 | 0.03 | 1.5 | 0.035 | 0.01 | 0.5 | 5.5 – 9.5 | 26.0 – 29.0 | 4.0 – 5.0 | 0.30 – 0.50 | 1 | Co 0.5 – 2.0 | |
| S32750D | 2507 | 0.030 | 1.20 | 0.035 | 0.020 | 0.80 | 6.0 – 8.0 | 24.0 – 26.0 | 3.0 – 5.0 | 0.24 – 0.32 | 0.5 | … |
| S32760E | 0.03 | 1 | 0.03 | 0.01 | 1 | 6.0 – 8.0 | 24.0 – 26.0 | 3.0 – 4.0 | 0.20 – 0.30 | 0.50 – 1.00 | W 0.50 – 1.00 | |
| S32808 | 0.03 | 1.1 | 0.03 | 0.01 | 0.5 | 7.0 – 8.2 | 27.0 – 27.9 | 0.80 – 1.20 | 0.30 – 0.40 | … | W 2.10 – 2.50 | |
| S32900 | 329 | 0.08 | 1 | 0.04 | 0.03 | 0.75 | 2.5 – 5.0 | 23.0 – 28.0 | 1.00 – 2.00 | … | … | … |
| S32906 | 0.03 | 0.80 – 1.50 | 0.03 | 0.03 | 0.8 | 5.8 – 7.5 | 28.0 – 30.0 | 1.50 – 2.60 | 0.30 – 0.40 | 0.8 | … | |
| S32950 | 0.03 | 2 | 0.035 | 0.01 | 0.6 | 3.5 – 5.2 | 26.0 – 29.0 | 1.00 – 2.50 | 0.15 – 0.35 | … | … | |
| S33207 | 0.03 | 1.5 | 0.035 | 0.01 | 0.8 | 6.0 – 9.0 | 29.0 – 33.0 | 3.0 – 5.0 | 0.40 – 0.60 | 1 | … | |
| Notes: ᵃ Maximum, unless a range or minimum is indicated. Where ellipses (…) appear in this table, there is no minimum and analysis of the element need not be determined or reported. ᵇ For purposes of classification, the UNS number is primary. ᶜ Common name, not a trademark, widely used, Practice E527 and SAE J 1086. ᵈ % Cr + 3.3 × % Mo + 16 × %N ≥ 41. ᵉ % Cr + 3.3 × (% Mo + % W) + 16 × % N ≥ 41. |
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Why Choose TOKO TECH’s 2507 Coiled Tubing?
TOKO TECH ensures top quality through stringent control. The manufacturing process includes a precise solution annealing and rapid quenching heat treatment at ~1070°C to achieve the optimal ~50/50 austenite-ferrite phase balance, which is critical for performance and avoiding harmful secondary phases. This is followed by 100% non-destructive testing. Given its use in extreme environments, coils are protected with VCI packaging or higher-grade methods to prevent surface corrosion during transit and storage.
In summary, TOKO TECH’s 2507 seamless coiled tubing provides an ultra-reliable, high-strength solution for the most severe corrosive and high-pressure applications. Its superior alloy composition and balanced structure make it a top-tier choice for engineers in the offshore, oil & gas, and chemical processing industries where failure is not an option.