2507 Gate Valve (Super Duplex Stainless Steel)

2507 (UNS S32750 / EN 1.4410 / ASTM A890 Gr.5A) is a premium super duplex stainless steel — the highest grade among duplex steels, designed for extreme corrosion and high pressure. Below is complete technical data, features, specifications, and application guide.

🧱 Material Core Advantages

Composition: 25%Cr + 7%Ni + 4%Mo + N₂; dual-phase structure (austenite + ferrite)
Strength: Yield strength ≥ 550 MPa — 2x stronger than 316L, 1.5x stronger than 2205
Коррозионная стойкость: PREN > 42; best resistance to chloride pitting, crevice corrosion, and stress corrosion cracking (seawater, brine, H₂S, acids) — far superior to 316L/2205
Temperature: Stable up to 300–350°C; no brittleness like austenitic steels
Ограничения: Avoid >400°C (risk of sigma phase); higher cost, better weld control needed

⚙️ Main Specifications

✅ Design Standards

Design: API 600, API 6D, ASME B16.34, EN 1984
Dimensions: ASME B16.10 / B16.5, EN 558
Test: API 598, EN 12266; optional КДЕС MR0175 (sour service)

✅ Size & Pressure

Size: DN50–DN1200 (NPS 2″–48″)
Pressure: Class 150–2500 / PN16–PN160
Temperature: -40°C ~ +300°C (max 350°C intermittent)

✅ Structure & Type

Model: Z41Y (rising stem), Z45Y (non-rising stem)
Wedge: Solid or flexible wedge; full bore / reduced bore
Bonnet: Bolted bonnet (BB), Outside Screw & Yoke (OS&Y)
Connection: Flange RF/RTJ, Butt Weld, Socket Weld

✅ Standard Material List

Part	Материал
Body / Bonnet / Gate	2507 / ASTM A890 Gr.5A / UNS S32750
Корень	2507 / F53 / Alloy 718
Seat / Seal	Stellite hardfaced or solid 2507
Packing	Graphite, PTFE, or high-temperature fiber
Gasket	Spiral wound (graphite + 2507 inner/outer ring)

Основные характеристики

Ultra-High Corrosion Resistance: Perfect for seawater, desalination, brine, produced water, acidic/chloride media — where 316L/2205 fail quickly
High Strength: Thinner wall than 316L → lighter weight, compact design
Low Flow Resistance: Full bore, straight-through flow, minimal pressure drop
Bidirectional Sealing: Works equally well in both flow directions
Long Life: 3–5x service life vs. 316L in harsh environments; low maintenance

Zero Leakage: Metal-to-metal sealing; suitable for critical isolation

Typical Applications

✅ Offshore / Marine: FPSO, platforms, seawater cooling, firewater systems
✅ Oil & Gas: Sour service (H₂S/CO₂), produced water, pipeline isolation
✅ Desalination: SWRO plants, high-salinity brine
✅ Chemical: Chlor-alkali, phosphoric acid, bleach, strong oxidizers
✅ Mining: Slurry, acidic wastewater, chloride-rich processes
✅ Coastal/Power: Cooling water, flue gas treatment, salt environments
Comparison: 2507 vs 2205 vs 316L

Item	316L	2205	2507
Strength	Середина	Высокий	Very High
Chloride Resistance	Poor	Good	Excellent
Max Temp	450°C	300°C	320°C
Sour Service	No	Limited	Yes
Расходы	Низкий	Середина	Высокий
Best For	General use	Moderate corrosion	Severe corrosion / high pressure

Installation & Operation Notes

Welding: Must use matching filler wire; avoid overheating (>350°C) — risk of reduced corrosion resistance
Gasket/Packing: Use only compatible materials; avoid carbon steel contact (risk of galvanic corrosion)
Операция: Fully open / fully close only; not for throttling
Cleaning: Do not use carbon steel brushes; keep away from iron contamination

Часто задаваемые вопросы

Q: When should I choose 2507 instead of 2205?

A: If chloride > 10,000 ppm, seawater, sour gas, or operating >150°C — 2507 is the only safe choice.

Q: Is 2507 better than Alloy 20 / 904L?

A: For chloride/seawater — yes, much better and stronger. For pure sulfuric acid — Alloy 20 may be better.

Q: Can it replace titanium?

A: In most marine/chemical cases — yes, at lower cost and higher strength.

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Продукты

2507 Gate Valve, 4 Inch, API 600, 150 LB, RF End

2507 Gate Valve (Super Duplex Stainless Steel)

🧱 Material Core Advantages