Hastelloy G-50™ Grade 100 Ni-Cr-Fe-Mo Alloy,UNS N06950，1

### **Hastelloy® G-50™ Grade 100 (UNS N06950) - Nickel-Chromium-Iron-Molybdenum Corrosion Resistant Alloy** #### **Overview** **Hastelloy® G-50™ Grade 100** is a versatile nickel-chromium-iron-molybdenum alloy designed to provide excellent corrosion resistance in a wide range of aggressive environments, particularly in sulfuric and phosphoric acid applications. This alloy offers an optimal balance of corrosion resistance, mechanical properties, and cost-effectiveness, making it suitable for various chemical process industries and pollution control applications. --- #### **Chemical Composition (Weight %)** | Element | Content (%) | Function | |---------|-------------|-----------| | **Nickel (Ni)** | **Balance** | **Base element providing corrosion resistance** | | **Chromium (Cr)** | **29.0-31.0** | **Primary element for oxidizing corrosion resistance** | | **Iron (Fe)** | **13.0-17.0** | **Cost-effective matrix element** | | **Molybdenum (Mo)** | **5.0-7.0** | **Resistance to reducing environments and pitting** | | **Copper (Cu)** | **1.5-2.5** | **Enhances sulfuric acid resistance** | | **Cobalt (Co)** | **≤ 2.0** | **Controlled impurity** | | **Tungsten (W)** | **1.5-2.5** | **Additional corrosion resistance** | | **Manganese (Mn)** | **≤ 1.5** | **Deoxidizer** | | **Silicon (Si)** | **≤ 1.0** | **Controlled impurity** | | **Niobium (Nb)** | **0.50-1.50** | **Stabilization against sensitization** | | **Carbon (C)** | **≤ 0.03** | **Controlled for carbide formation** | | **Phosphorus (P)** | **≤ 0.04** | **Controlled impurity** | | **Sulfur (S)** | **≤ 0.03** | **Controlled impurity** | --- #### **Physical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | **8.22 g/cm³ (0.297 lb/in³)** | | **Melting Range** | **1340-1390°C (2444-2534°F)** | | **Electrical Resistivity** | **1.12 μΩ·m** | | **Thermal Conductivity** | **11.8 W/m·K (at 100°C)** | | **Coefficient of Thermal Expansion** | **13.5 μm/m·°C (20-300°C)** | | **Specific Heat Capacity** | **442 J/kg·K** | | **Magnetic Permeability** | **< 1.02 (slightly magnetic)** | --- #### **Mechanical Properties (Annealed Condition)** | Temperature | Tensile Strength | Yield Strength (0.2%) | Elongation | Hardness | |-------------|------------------|---------------------|------------|----------| | **Room Temperature** | **655 MPa (95 ksi)** | **295 MPa (43 ksi)** | **45%** | **85 HRB** | | **200°C (392°F)** | **620 MPa (90 ksi)** | **275 MPa (40 ksi)** | **42%** | **82 HRB** | | **400°C (752°F)** | **585 MPa (85 ksi)** | **260 MPa (38 ksi)** | **40%** | **80 HRB** | --- #### **Corrosion Resistance Performance** | Environment | Performance | Temperature Limit | |-------------|-------------|-------------------| | **Sulfuric Acid** | **Excellent** | **Various concentrations and temperatures** | | **Phosphoric Acid** | **Excellent** | **All concentrations up to boiling** | | **Nitric Acid** | **Good** | **Moderate concentrations** | | **Organic Acids** | **Very Good** | **Wide range of conditions** | | **Chloride Media** | **Good** | **Resists stress corrosion cracking** | --- #### **Key Characteristics & Applications** **Key Characteristics:** - **Versatile Corrosion Resistance**: Good performance in both oxidizing and reducing environments - **Excellent Sulfuric Acid Resistance**: Optimal for sulfuric acid processing equipment - **Good Mechanical Properties**: Balanced strength and ductility - **Excellent Fabricability**: Good weldability and formability - **Cost-Effective Solution**: Provides excellent performance at competitive cost - **Resistance to Localized Corrosion**: Good pitting and crevice corrosion resistance **Typical Applications:** - **Chemical Processing**: Reactors, heat exchangers, and piping systems - **Sulfuric Acid Production**: Pickling lines, acid concentrators, and storage tanks - **Phosphoric Acid Manufacture**: Process equipment and handling systems - **Pollution Control**: Flue gas desulfurization systems and scrubbers - **Pulp and Paper Industry**: Digesters and bleaching systems - **Metal Processing**: Pickling tanks and surface treatment equipment - **Fertilizer Production**: Process vessels and piping --- #### **International Standards & Specifications** | Standard | Designation | Description | |----------|-------------|-------------| | **UNS** | **N06950** | **Unified Numbering System** | | **ASTM** | **B574** | **Rod and Bar** | | **ASTM** | **B575** | **Plate, Sheet, and Strip** | | **ASTM** | **B619** | **Welded Pipe** | | **ASTM** | **B622** | **Seamless Pipe and Tube** | | **ASME** | **SB-574** | **Boiler and Pressure Vessel Code** | | **DIN** | **2.4609** | **German Standard** | --- #### **Manufacturing & Processing** **Available Forms:** - **Plate and Sheet**: 0.5 mm to 100 mm thickness - **Bar and Rod**: 5 mm to 300 mm diameter - **Pipe and Tube**: 10 mm to 600 mm diameter - **Wire and Strip**: Various sizes for specialized applications - **Fittings and Flanges**: Complete piping components **Processing Guidelines:** - **Hot Working**: 1150-1200°C (2102-2192°F) - **Cold Working**: Good capability with intermediate annealing - **Annealing**: 1120-1170°C (2048-2138°F) with rapid cooling - **Welding**: Excellent weldability using GTAW, GMAW, SMAW - **Machining**: Similar to other nickel-based alloys --- #### **Quality Control & Testing** - **Chemical Analysis**: Per ASTM E1473 - **Mechanical Testing**: Per ASTM E8/E8M - **Corrosion Testing**: ASTM G28 Method A - **Non-Destructive Testing**: UT, RT, PT as required - **Metallographic Examination**: Per ASTM E3 - **Hardness Testing**: Per ASTM E10 --- #### **Comparison with Competitive Alloys** | Property | G-50 Grade 100 | C-276 | 825 | 20Cb-3 | |----------|----------------|-------|-----|---------| | **Sulfuric Acid Resistance** | **Excellent** | Good | Very Good | Excellent | | **Cost Effectiveness** | **High** | Medium | Medium | High | | **Fabricability** | **Excellent** | Excellent | Good | Excellent | | **Chromium Content** | **30%** | **16%** | **21%** | **20%** | --- #### **Summary** **Hastelloy® G-50™ Grade 100 (UNS N06950)** represents a well-balanced nickel-chromium-iron-molybdenum alloy that delivers exceptional corrosion resistance in sulfuric and phosphoric acid environments at a competitive cost point. Its optimized composition provides reliable performance across a broad spectrum of chemical processing applications, particularly where sulfuric acid handling is involved. The alloy's excellent fabricability, combined with good mechanical properties and comprehensive international standardization, makes it a preferred choice for chemical processors seeking cost-effective solutions for corrosive service conditions. Supported by proven field performance and established manufacturing protocols, G-50 Grade 100 continues to serve as a reliable material selection for demanding applications in chemical processing, pollution control, and industrial acid handling systems.

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 3249 gallon liquid totes Special package is available on request.