or the most demanding sea water applications – deep offshore platforms, high-temperature brine transfer, and aggressive chemical environments – standard duplex 2205 split case pump may not work well. When you need extreme pitting resistance, superior mechanical strength, and outstanding erosion-corrosion resistance, the answer is a super duplex stainless steel 2507 split case pump for sea water.
Hunan Durafort Pumps Co., Ltd., a leading pump manufacturer in Hunan Province and South China, offers the ปั๊มแบบตัวเครื่องแยกส่วนแนวนอน ซีรีส์ XSP engineered with super duplex 2507 (ASTM A182 F53 / UNS S32750) – a premium super duplex stainless steel designed for the harshest marine and industrial environments.
Main Products
Hunan Durafort Pumps manufactures a wide range of heavy-duty pumps with over 300 employees and an annual production of 20,000 units:
- Split case pump (XSP series)
- Vertical turbine pump (LC series)
- Vertical mixed flow pump (ZLB series)
- Vertical axial flow pump for sea water
Available materials: Cast iron / HT250, carbon steel, 304, 316L, SS2205, SS2507, 904L, CD4MCu, and more.
Why Super Duplex 2507 (ASTM A182 F53) for Sea Water Pumps?
Sea water is highly corrosive – especially in warm climates, tidal zones, and systems with stagnant or low-flow conditions. Super duplex 2507 offers:
- PREN > 40 (pitting resistance equivalent number) – far superior to 316L (PREN ~25) and duplex 2205 (PREN ≥35).
- Excellent resistance to chloride stress corrosion cracking (SCC) – even at elevated temperatures (>60°C).
- Very high mechanical strength – yield strength ≥550 MPa, tensile strength ≥750 MPa, allowing lighter pump casings and higher pressure ratings.
- Superior erosion-corrosion resistance – ideal for sea water containing sand, silt, or other particulates.
Material Identity: 2507 / UNS S32750 / ASTM A182 F53
| Designation | Standard |
|---|---|
| 2507 | Common trade name (25% Cr, 7% Ni, 4% Mo, 0.27% N) |
| UNS S32750 | Unified numbering system code |
| ASTM A182 F53 | Forged super duplex stainless steel specification |
Typical chemical composition (wt%):
| Element | % |
|---|---|
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 4.5 |
| Nitrogen (N) | 0.24 – 0.35 |
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.015 |
Mechanical properties (ASTM A182 F53):
| ทรัพย์สิน | ค่า |
|---|---|
| Tensile strength | ≥ 750 MPa (≥ 800 MPa in some specifications) |
| Yield strength (0.2% offset) | ≥ 550 MPa |
| Elongation | ≥ 25% (some sources ≥15%) |
| Hardness | ≤ 270 HB (or ≤ 310 HB) |
XSP Series Split Case Pump – Designed for Super Duplex 2507 Sea Water Duties
Hunan Durafort Pumps’s ปั๊มแบบตัวเครื่องแยกส่วนแนวนอน ซีรีส์ XSP is available with wetted parts (casing, impeller, wear rings, shaft sleeve) manufactured in ซูเปอร์ดูเพล็กซ์ 2507. The split case design allows easy maintenance without disturbing suction or discharge piping – a critical feature for offshore and marine installations.
Technical Specifications (Super Duplex 2507 Version)
| พารามิเตอร์ | ช่วง |
|---|---|
| อัตราการไหล | 135 – 38,000 m³/h |
| หัวหน้า | 12 – 205 เมตร |
| ความเร็ว | 1,450 – 2,970 rpm (customizable) |
| อุณหภูมิ | สูงสุด 150°C |
| Materials (wetted parts) | Super Duplex 2507, Duplex 2205, 904L, CD4MCu, 316L, Carbon Steel, Cast Iron |
*Additional materials: Cast Iron / HT250, Ductile Iron, SS304, SS316L, SS2205, SS2507, 904L, CD4MCu.*
Key Applications of Super Duplex 2507 Split Case Pumps for Sea Water
The super duplex stainless steel 2507 split case pump for sea water is engineered for the most severe environments:
- Offshore oil & gas platforms – Sea water lift pumps, fire water systems, injection pumps, cooling water.
- Desalination plants – High-pressure brine transfer, reverse osmosis feed, and reject brine handling.
- Marine & shipbuilding – Ballast water, engine cooling, fire main systems, bilge and service water.
- Coastal power generation – Thermal and nuclear plant cooling water intake, condensate systems.
- Chemical & petrochemical – Heat exchangers and pump service in chloride-laden process streams.
- Flue gas desulfurization (FGD) – Scrubber recirculation and slurry handling (high chlorides, low pH).
Super Duplex 2507 vs. Duplex 2205 vs. 316L in Sea Water
| วัสดุ | PREN | ความต้านทานต่อ SCC ของคลอไรด์ | Yield Strength (MPa) | Typical Application in Sea Water |
|---|---|---|---|---|
| 316L | ~25 | Poor (susceptible >50°C) | ~170 | Low chlorinity, ambient fresh/brackish water |
| Duplex 2205 | ≥35 | Excellent (up to ~60°C) | ≥450 | General sea water, moderate temperature |
| Super Duplex 2507 | >40 | Superior (up to >100°C) | ≥550 | High-temperature sea water, brine, aggressive offshore |
For high-velocity sea water, warm coastal intakes, or deaerated brine, 2507 delivers the longest service life and lowest total cost of ownership.
Casting & Manufacturing Quality for Super Duplex 2507
Hunan Durafort Pumps employs stringent procedures for super duplex 2507 components:
- Casting – Investment or precision sand casting to UNS S32750 / ASTM A890 grade (equivalent to Gr. 6A or similar).
- Solution annealing – 1020–1100°C followed by water quenching to restore the optimal austenite‑ferrite balance (≈50% each).
- Welding – Recommended filler: ER2594 (for super duplex) or ER2209 with strict heat input control (0.5–2.5 kJ/mm) to avoid intermetallic phases.
- Testing – 100% hydrostatic testing, performance testing to ISO 9906, and positive material identification (PMI) for alloy verification.
Every pump supplied with EN 10204 3.1 material certificate and full traceability.
ข้อดีของการเลือกปั๊ม Hunan Durafort
- Broad product portfolio – Split case pump, vertical turbine pump, vertical mixed flow pump, vertical axial flow pump.
- Material flexibility – From cast iron to super duplex 2507, 904L, CD4MCu, and custom alloys.
- High production capacity – 20,000 units/year with 300+ experienced employees.
- Global project experience – Supplying sea water pumps to Middle East desalination, Southeast Asia offshore platforms, African power plants, and South American marine industries.
- ISO 9001 certified – Stringent quality control from casting to final assembly.
Order Your Super Duplex Stainless Steel 2507 Split Case Pump for Sea Water Today
When your sea water application demands maximum corrosion resistance, high pressure handling, and long-term reliability, Hunan Durafort Pumps delivers custom-engineered XSP series split case pumps in super duplex 2507 with competitive lead times.
Contact Hunan Durafort Pumps:
📧 sales@deyangforge.com
