N-7M Cast UNS N30007 Severe Corrosion and Heat Resistant Alloy,1

### **Product Datasheet: N-7M Cast Nickel Alloy (UNS N30007)** **A Nickel-Molybdenum Casting Alloy for Severe Reducing Corrosion Environments** --- #### **1. Overview** **N-7M** (UNS N30007) is a nickel-molybdenum casting alloy designed to provide exceptional resistance to severe corrosive environments, particularly in reducing acid conditions. As the cast equivalent of wrought HASTELLOY® B alloy (UNS N10001), this material offers outstanding performance in hydrochloric acid at all concentrations and temperatures, along with excellent resistance to sulfuric, phosphoric, and other non-oxidizing acids. The alloy maintains good mechanical properties at elevated temperatures and exhibits excellent structural stability in high-temperature service. Its high molybdenum content provides superior resistance to localized corrosion while maintaining good fabricability and weldability characteristics in the cast form. --- #### **2. Chemical Composition (Typical Weight %)** | Element | Content (%) | Role in the Alloy | |---------|-------------|-------------------| | **Nickel (Ni)** | Balance (~65-70) | Forms the corrosion-resistant matrix | | **Molybdenum (Mo)** | ~26.0-30.0 | Provides resistance to reducing acids | | **Iron (Fe)** | ~2.0-6.0 | Controlled residual element | | **Chromium (Cr)** | ≤ 1.0 | Deliberately kept low for reducing environments | | **Cobalt (Co)** | ≤ 2.5 | Residual element | | **Manganese (Mn)** | ≤ 1.0 | Residual element | | **Silicon (Si)** | ≤ 1.0 | Improves castability | | **Carbon (C)** | ≤ 0.05 | Controlled for corrosion resistance | | **Vanadium (V)** | ≤ 0.20 | Residual element | --- #### **3. Physical Properties (Typical)** | Property | Value / Condition | |----------|-------------------| | **Density** | 9.24 g/cm³ (0.334 lb/in³) | | **Melting Range** | 1330-1380 °C (2425-2515 °F) | | **Thermal Expansion Coefficient** | 10.3 μm/m·°C (20-100°C) | | **Thermal Conductivity** | 12.5 W/m·K (at 100°C) | | **Modulus of Elasticity** | 195 GPa (28.3×10⁶ psi) | | **Electrical Resistivity** | 1.35 μΩ·m | | **Specific Heat Capacity** | 380 J/kg·K (at 20°C) | --- #### **4. Mechanical Properties (As-Cast Condition)** **Room Temperature Properties:** * **Tensile Strength**: 690-860 MPa (100-125 ksi) * **Yield Strength (0.2% Offset)**: 310-480 MPa (45-70 ksi) * **Elongation**: 8-20% * **Hardness**: 200-250 HB **Elevated Temperature Performance:** * Maintains good strength up to 700°C (1290°F) * Excellent creep resistance in high-temperature corrosive environments --- #### **5. Corrosion Resistance** **Excellent Performance in:** * **Hydrochloric Acid**: Outstanding resistance at all concentrations and temperatures * **Sulfuric Acid**: Excellent performance in non-oxidizing concentrations * **Phosphoric Acid**: Superior resistance in pure and impure acid * **Other Reducing Acids**: Excellent performance in formic, acetic, and other organic acids * **Chloride Solutions**: Good resistance to stress corrosion cracking **Limitations:** * Not recommended for oxidizing acids (nitric acid, chromic acid) * Vulnerable to corrosion in oxidizing chloride solutions * Performance depends on maintaining reducing conditions --- #### **6. Product Applications** **Chemical Processing Industry:** * Hydrochloric acid production and handling equipment * Sulfuric acid concentrators and pickling tanks * Reaction vessels for organic chemical synthesis * Acid recovery system components **Pharmaceutical Industry:** * Chemical reactor vessels * Acid handling systems * Process piping and valves **Other Applications:** * Heat exchangers for corrosive media * Pump casings and impellers for acid service * Distillation column internals * Evaporator bodies and components --- #### **7. International Standards** * **Cast Alloy Specifications**: * **UNS N30007**: Cast version designation * **ASTM A494/A494M**: Standard specification for castings * **Grade N-7M**: Commercial casting designation * **Wrought Equivalent**: * **UNS N10001**: Wrought HASTELLOY B alloy * **ASTM B333**: Plate, sheet, and strip * **ASTM B335**: Rod and bar * **Additional Certifications**: * ASME Boiler and Pressure Vessel Code * ISO 15156 (NACE MR0175) for sour service * Various international pressure equipment standards --- **Technical Note:** N-7M castings provide an economical alternative to fabricated wrought components for complex geometries in severe corrosive service. The alloy's performance is optimized for reducing acid environments where chromium-containing alloys would suffer accelerated corrosion. Proper heat treatment is essential to achieve optimal corrosion resistance in cast components. Consultation with the foundry regarding solution annealing requirements is recommended for critical applications. *HASTELLOY is a registered trademark of Haynes International. N-7M is the standard ASTM designation for cast versions of this nickel-molybdenum alloy.*

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3390 gallon liquid totes Special package is available on request.