1. What is the equivalent substitute for Hastelloy C4?
ASTM Standard: ASTM B574 (seamless tubes), ASTM B575 (welded tubes), ASTM B622 (plates/sheets), which directly cover Hastelloy C4 and are widely used in the US.
ISO Standard: ISO 15156-3, which classifies materials for oil and gas industry use; Hastelloy C4 is included here, with equivalent material designations aligned to its chemical composition.
Other Trade Names: Some manufacturers use proprietary names for Hastelloy C4 equivalents, such as Haynes 625 (note: Haynes 625 has slightly different composition but similar corrosion resistance in specific environments) or alloy variants like Nicrofer 6025 HT, though these require verification of chemical and mechanical properties for exact substitution.
2. What are the execution standards for material Hastelloy C4?
| Standard Body | Product Form | Specific Standard Number & Title |
|---|---|---|
| ASTM (USA) | Plates/Sheets | ASTM B622 - Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) and Nickel-Chromium-Molybdenum Alloy (UNS N06455) Plate, Sheet, and Strip |
| ASTM (USA) | Seamless Tubes | ASTM B574 - Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) and Nickel-Chromium-Molybdenum Alloy (UNS N06455) Seamless Pipe and Tube |
| ASTM (USA) | Welded Tubes | ASTM B575 - Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) and Nickel-Chromium-Molybdenum Alloy (UNS N06455) Welded Pipe and Tube |
| ISO (Global) | Multiple Forms | ISO 15156-3:2020 - Petroleum and natural gas industries - Materials for use in H2S-containing environments in oil and gas production - Part 3: Casing, tubing, and downhole equipment |
| DIN (Germany) | General Alloys | DIN EN 10095 - Heat-resistant steels and nickel-based alloys - Technical delivery conditions (includes requirements for Hastelloy C4 variants) |
