Hastelloy C-276 alloy,nickel-molybdenum-chromium wrought alloy,1

### **Hastelloy® C-276 Alloy (UNS N10276) - Nickel-Molybdenum-Chromium Superalloy** #### **Overview** **Hastelloy® C-276** is a versatile nickel-molybdenum-chromium wrought superalloy renowned for its exceptional corrosion resistance in a wide range of severe environments. This nickel-based alloy exhibits outstanding performance against both oxidizing and reducing media, including resistance to pitting, crevice corrosion, and stress-corrosion cracking. The low carbon content and optimized chemical composition make it particularly suitable for welded applications where it maintains excellent corrosion resistance in the as-welded condition. --- #### **Chemical Composition (Weight %)** | Element | Content (%) | Function | |---------|-------------|-----------| | **Nickel (Ni)** | **Balance** | **Base element providing corrosion resistance** | | **Molybdenum (Mo)** | **15.0-17.0** | **Resistance to reducing media and chlorides** | | **Chromium (Cr)** | **14.5-16.5** | **Oxidation resistance and passivation** | | **Tungsten (W)** | **3.0-4.5** | **Enhanced corrosion resistance** | | **Iron (Fe)** | **4.0-7.0** | **Controlled impurity** | | **Cobalt (Co)** | **≤ 2.5** | **Controlled impurity** | | **Manganese (Mn)** | **≤ 1.0** | **Deoxidizer** | | **Vanadium (V)** | **≤ 0.35** | **Controlled impurity** | | **Silicon (Si)** | **≤ 0.08** | **Controlled impurity** | | **Carbon (C)** | **≤ 0.01** | **Minimized to prevent carbide precipitation** | | **Phosphorus (P)** | **≤ 0.025** | **Controlled impurity** | | **Sulfur (S)** | **≤ 0.01** | **Controlled impurity** | --- #### **Physical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | **8.89 g/cm³ (0.321 lb/in³)** | | **Melting Range** | **1325-1370°C (2417-2498°F)** | | **Electrical Resistivity** | **1.30 μΩ·m** | | **Thermal Conductivity** | **11.1 W/m·K (at 100°C)** | | **Coefficient of Thermal Expansion** | **11.2 μm/m·°C (20-100°C)** | | **Specific Heat Capacity** | **427 J/kg·K** | | **Magnetic Permeability** | **< 1.001 (essentially non-magnetic)** | --- #### **Mechanical Properties (Room Temperature)** | Property | Annealed Condition | |----------|---------------------| | **Tensile Strength** | **790 MPa (115 ksi)** | | **Yield Strength (0.2% Offset)** | **355 MPa (52 ksi)** | | **Elongation** | **50%** | | **Reduction of Area** | **65%** | | **Hardness (Rockwell B)** | **≤ 100 HRB** | --- #### **High-Temperature Mechanical Properties** | Temperature | Tensile Strength | Yield Strength | Elongation | |-------------|------------------|----------------|------------| | **200°C (392°F)** | **725 MPa (105 ksi)** | **325 MPa (47 ksi)** | **48%** | | **400°C (752°F)** | **690 MPa (100 ksi)** | **305 MPa (44 ksi)** | **45%** | | **600°C (1112°F)** | **655 MPa (95 ksi)** | **290 MPa (42 ksi)** | **42%** | --- #### **Corrosion Resistance Performance** | Environment | Concentration | Temperature | Performance | |-------------|---------------|-------------|-------------| | **Hydrochloric Acid** | **All concentrations** | **Up to boiling** | **Excellent** | | **Sulfuric Acid** | **0-60%** | **Up to boiling** | **Excellent** | | **Phosphoric Acid** | **All concentrations** | **Up to boiling** | **Excellent** | | **Chlorine Gas** | **Wet and dry** | **Ambient** | **Excellent** | | **Seawater** | **-** | **Ambient to elevated** | **Excellent** | --- #### **Key Characteristics & Applications** **Key Characteristics:** - **Exceptional Corrosion Resistance**: Outstanding performance in diverse corrosive media - **Versatile Application Range**: Suitable for both oxidizing and reducing environments - **Excellent As-Welded Performance**: Maintains corrosion resistance after welding - **Good Fabricability**: Can be formed and machined using standard techniques - **High Temperature Capability**: Maintains properties at elevated temperatures - **Resistance to Localized Corrosion**: Excellent pitting and crevice corrosion resistance **Typical Applications:** - **Chemical Processing**: Reactors, vessels, heat exchangers, and piping systems - **Pollution Control**: Flue gas desulfurization systems, scrubbers, and ducting - **Pulp and Paper Industry**: Digesters, bleach plants, and chemical recovery systems - **Pharmaceutical Industry**: Reaction vessels and processing equipment - **Waste Treatment**: Incinerators and waste water treatment systems - **Marine Engineering**: Seawater handling systems and offshore platforms - **Oil and Gas**: Downhole components and production tubing --- #### **International Standards & Specifications** | Standard | Designation | Description | |----------|-------------|-------------| | **UNS** | **N10276** | **Unified Numbering System** | | **ASME** | **SB-574** | **Rod and Bar** | | **ASME** | **SB-575** | **Plate, Sheet, and Strip** | | **ASME** | **SB-619** | **Welded Pipe and Tube** | | **ASME** | **SB-622** | **Seamless Pipe and Tube** | | **ASME** | **SB-626** | **Welded Tube** | | **ASTM** | **B574** | **Rod and Bar** | | **ASTM** | **B575** | **Plate, Sheet, and Strip** | | **DIN** | **2.4819** | **German Standard** | --- #### **Fabrication & Processing** **Available Forms:** - **Plate and Sheet**: 0.5 mm to 100 mm thickness - **Bar and Rod**: 3 mm to 300 mm diameter - **Pipe and Tube**: 6 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 (2100-2190°F) - **Cold Working**: Good capability with intermediate annealing - **Annealing**: 1150-1175°C (2100-2145°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, G48, G61 methods - **Non-Destructive Testing**: UT, RT, PT, ET as required - **Metallographic Examination**: Per ASTM E3 --- #### **Comparison with Competitive Alloys** | Property | C-276 | C-22 | C-2000 | 625 | |----------|-------|------|---------|-----| | **Mo Content** | **15-17%** | 13-14.5% | 15-17% | 8-10% | | **Cr Content** | **14.5-16.5%** | 20-22.5% | 22-24% | 20-23% | | **Oxidizing Media** | **Very Good** | **Excellent** | **Excellent** | **Excellent** | | **Reducing Media** | **Excellent** | **Very Good** | **Excellent** | **Good** | --- #### **Summary** **Hastelloy® C-276 (UNS N10276)** represents one of the most versatile and widely used corrosion-resistant alloys in the chemical processing industry. Its balanced composition provides exceptional resistance to a broad spectrum of corrosive environments, from strong oxidizing conditions to severe reducing media. The alloy's excellent performance in the as-welded condition, combined with good fabricability and comprehensive international standardization, has established it as a benchmark material for demanding applications across multiple industries. Supported by extensive service experience and rigorous quality standards through ASME SB-574, SB-575, SB-619, SB-622, and SB-626 specifications, C-276 continues to be the material of choice for critical components where reliability in aggressive environments is paramount.

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 3243 gallon liquid totes Special package is available on request.