Handling phosphoric acid and phosphate fertilizer slurries is one of the toughest challenges in the chemical industry. These fluids are highly corrosive, often contain abrasive solids, and operate at elevated temperatures. Standard stainless steels like 304 or 316L fail rapidly. The proven solution? A CD4MCuN split case pump for phosphoric acid phosphate fertilizer applications.
Hunan Durafort Pumps Co., Ltd., a leading pump manufacturer in Hunan Province and South China, offers the XSP series horizontal split case pump engineered with CD4MCuN (ASTM A890 Grade 1B) – a duplex stainless steel specifically developed for aggressive acidic and chloride-laden environments.
Main Products
With more than 300 employees and an annual production of 20,000 pump units, Hunan Durafort Pumps produces:
- LC vertical turbine pump
- XSP split case pump with material Duplex 2205/ Super duplex 2507 designed for seawater
- ZLB vertical axial flow pump for river water/ seawater
- Vertical mixed flow pump
Available materials: Cast iron / HT250, carbon steel, 304, 316L, SS2205, SS2507, 904L, CD4MCuN, and more.
Why CD4MCuN (ASTM A890 Grade 1B) for Phosphoric Acid & Phosphate Fertilizer?
Phosphoric acid (H₃PO₄) – especially wet-process phosphoric acid used in fertilizer production – contains impurities like fluorides, chlorides, and sulfuric acid residues. These create an extremely corrosive environment with high pitting and crevice corrosion risk. CD4MCuN provides:
- Superior pitting resistance – far exceeding 316L and comparable to higher grades.
- Excellent resistance to phosphoric acid attack – proven in wet-process acid service.
- High mechanical strength – yield strength roughly twice that of 316L, allowing thinner walls and reduced weight.
- Good erosion resistance – essential when handling gypsum-containing phosphate slurries.
- Cost-effective alternative – lower cost than high-nickel alloys or super duplex for many phosphoric acid applications.
CD4MCuN Material Specifications
| Designation | Standard |
|---|---|
| CD4MCuN | Common cast duplex stainless steel name |
| ASTM A890 Grade 1B | Casting specification for duplex stainless steel |
| UNS J93372 | Unified numbering system code |
Typical chemical composition (wt%):
| Element | % |
|---|---|
| Chromium (Cr) | 24.5 – 26.5 |
| Nickel (Ni) | 4.7 – 6.0 |
| Molybdenum (Mo) | 1.7 – 2.3 |
| Copper (Cu) | 2.7 – 3.3 |
| Nitrogen (N) | 0.10 – 0.25 |
| Carbon (C) | ≤ 0.04 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
Key properties:
- Pitting Resistance Equivalent Number (PREN) ≈ 30–35
- Yield strength: ≥ 485 MPa
- Tensile strength: ≥ 690 MPa
- Elongation: ≥ 16%
XSP Series Split Case Pump – Designed for CD4MCuN in Phosphoric Acid Service
Hunan Durafort Pumps’s XSP series horizontal split case pump can be supplied with all wetted parts (casing, impeller, wear rings, shaft sleeve) in CD4MCuN. The split case design allows easy maintenance without disrupting piping – a critical advantage in continuous 24/7 fertilizer plant operations.
XSP Series Technical Specifications
| Parameter | Range |
|---|---|
| Flow rate | 135 – 38,000 m³/h |
| Head | 12 – 205 m |
| Speed | 1,450 – 2,970 rpm (customizable) |
| Temperature | Up to 150°C |
| Materials (wetted parts) | Cast Iron, Ductile Iron, SS304, SS316L, SS2205, SS2507, CD4MCuN |
Typical Applications of XSP Split Case Pump in CD4MCuN
The CD4MCuN split case pump for phosphoric acid phosphate fertilizer is ideal for:
- Phosphoric acid circulation – Wet-process plant (dihydrate or hemihydrate process)
- Phosphate fertilizer slurry – MAP (monoammonium phosphate), DAP (diammonium phosphate) transfer
- Filter feed and filtrate pumps – Phosphogypsum handling
- Acid cleaning loops – Recirculating dilute phosphoric acid
- Seawater cooling systems (where CD4MCuN also excels)
- Chemical processing – Acetic acid, dilute sulfuric acid, and other corrosive media
General Applications of XSP Split Case Pump (All Materials)
- Clean water / similar liquids – Municipal water supply, irrigation, circulation
- Corrosive media – Seawater, phosphoric acid, chemical raw materials
- High-temperature media – Up to 150°C
- Petroleum & chemical liquids
- Power plant cooling water – Thermal and nuclear stations
- District heating – Circulating systems
- Industrial water supply – Paper mills, steel mills, general manufacturing
CD4MCuN vs. Other Materials for Phosphoric Acid Service
| Material | PREN | Resistance to Wet-Process Phosphoric Acid | Relative Cost | Typical Life in Phosphoric Acid |
|---|---|---|---|---|
| 316L | ~25 | Poor (pitting after weeks) | Low | Months |
| Duplex 2205 | ≥35 | Good | Medium | 1-2 years |
| CD4MCuN | ~30-35 | Very Good (specially formulated with Cu) | Medium-High | 2-4 years |
| Super Duplex 2507 | >40 | Excellent | High | 4+ years |
| High-nickel alloys (Hastelloy) | >50 | Superior | Very High | 5+ years |
For phosphoric acid and phosphate fertilizer plants, CD4MCuN offers the best balance of performance and cost – significantly longer life than 316L without the high price of super duplex or nickel alloys.
Why Choose Hunan Durafort Pumps for Your CD4MCuN Split Case Pump?
- Specialized in corrosion-resistant alloys – Extensive experience casting CD4MCuN (ASTM A890 Grade 1B) for chemical service.
- Complete product range – XSP split case pump, LC vertical turbine pump, ZLB vertical axial flow pump, vertical mixed flow pump.
- High production capacity – 20,000 units/year with 300+ employees ensures short lead times.
- Global projects – Supplying pumps to phosphate fertilizer plants in Middle East, North Africa, Southeast Asia, and South America.
- ISO 9001 certified – Full material traceability, PMI testing, and performance testing to ISO 9906.
Order Your CD4MCuN Split Case Pump for Phosphoric Acid & Phosphate Fertilizer Today
Maximize uptime and reduce maintenance costs with an XSP series CD4MCuN split case pump from Hunan Durafort Pumps – engineered for the harshest phosphoric acid duties.
Contact Hunan Durafort Pumps:
📧 sales@deyangforge.com (example)
