Alloy 20 Bolting Products
Alloy 20 is listed in the NICKEL-IRON-CHROMIUM AUSTENITIC ALLOY material family. The reference data below should be checked against the governing product specification, product form and delivery condition before selection or certification.
The reference chemistry table for Alloy 20 lists Nickel (Ni): Nickel-rich base alloy; exact limit is specification controlled; Chromium (Cr): Chromium addition for passivation; Molybdenum (Mo): Improves resistance to pitting and reducing acids; Copper (Cu): Enhances resistance in sulfuric acid service. Confirm exact limits and analysis tolerances against the governing standard and product form.
The mechanical-property table for Alloy 20 lists Tensile Strength: 550–750 MPa; Yield Strength: 240–350 MPa; Elongation: 30–45 %; Hardness: Approx. 150–250 HB HB. These are reference entries; supplied condition, dimensions, test method and governing specification control the requirements, and the figures are not design allowables.
Werkstoff / EN cross-reference for Alloy 20: 2.4660. This comparison does not guarantee interchangeability; confirm chemistry, product form and condition against the governing specification.
View Technical Information →Standard identification and material designation information for Alloy 20.
The reference chemistry table lists Nickel (Ni): Nickel-rich base alloy; exact limit is specification controlled; Chromium (Cr): Chromium addition for passivation; Molybdenum (Mo): Improves resistance to pitting and reducing acids; Copper (Cu): Enhances resistance in sulfuric acid service. Confirm the governing standard, product analysis tolerances and product form before ordering.
| Element | Symbol | Composition |
|---|---|---|
| Nickel | Ni | Nickel-rich base alloy; exact limit is specification controlled |
| Chromium | Cr | Chromium addition for passivation |
| Molybdenum | Mo | Improves resistance to pitting and reducing acids |
| Copper | Cu | Enhances resistance in sulfuric acid service |
| Iron | Fe | Major balance element |
| Other Elements | — | Controlled according to the applicable grade and product specification |
The table reports Tensile Strength: 550–750 MPa; Yield Strength: 240–350 MPa; Elongation: 30–45 %; Hardness: Approx. 150–250 HB HB as reference data for Alloy 20. Actual requirements depend on condition, dimensions, test method and specification; these values are not design allowables.
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 550–750 | MPa |
| Yield Strength | 240–350 | MPa |
| Elongation | 30–45 | % |
| Hardness | Approx. 150–250 HB | HB |
Alloy 20 combines the characteristics of its stainless-steel family with grade-specific alloying and heat-treatment behavior suited to its intended service.
High nickel/chromium/molybdenum or strengthening additions provide enhanced service performance.
Molybdenum and nitrogen additions improve resistance to pitting and crevice corrosion in many chloride environments.
Selected for chemical-processing, marine and high-temperature applications.
Mechanical properties depend on product form, heat treatment and specification.
Alloy 20 is selected for engineered components and bolting where the material characteristics of this grade match the service environment.
Alloy 20 is considered for chemical and process equipment when its grade-specific corrosion, strength and temperature characteristics meet the service requirement.
Alloy 20 is considered for marine and offshore hardware when its grade-specific corrosion, strength and temperature characteristics meet the service requirement.
Alloy 20 is considered for heat exchangers and piping when its grade-specific corrosion, strength and temperature characteristics meet the service requirement.
Alloy 20 is considered for high-performance bolting when its grade-specific corrosion, strength and temperature characteristics meet the service requirement.
Match the alloy to the exact corrosive chemistry and temperature.
Use welded-condition corrosion data where applicable.
For bolting, check galling, preload retention and thermal-expansion compatibility.
The commonly listed Werkstoff / EN cross-reference for Alloy 20 is 2.4660. Treat this as a grade comparison, not a guarantee of interchangeability. Verify chemistry, product form, condition and governing specification against the supplier certificate before substitution.
Our engineering team can help you select suitable materials based on operating temperature, pressure and service conditions.