1. Material Definition and Standard Specifications
A32088 is a nickel-based high-temperature alloy steel pipe (corresponding to the US grade Incoloy 800H). Its core features include:
Composition Design:
Nickel-chromium-iron base (Ni ≥ 30%, Cr 19.0-23.0%, Fe ≥ 39.5%) + carbon reinforcement (C: 0.05-0.10%);
Aluminum-titanium composite addition (Al + Ti ≤ 0.70%) enhances high-temperature stability;
Implementation Standards: ASTM B407 (American Standard), GB/T 15062 (Chinese Standard), commonly used in the ASME Boiler and Pressure Vessel Code. 2. Core Performance Advantages
Temperature Resistance:
Continuous operating temperature 1150°C (short-term 1250°C);
Excellent creep resistance (815°C/100,000 hours endurance strength ≥ 30 MPa);
Corrosion Resistance:
Outstanding resistance to carburization and sulfidation (suitable for cracking furnace environments);
NACE MR0175 certified for sour environments;
Processing Characteristics: Requires ERNiCr-3 welding wire, with post-weld solution treatment (1150°C rapid cooling).
3. Typical Applications
Energy Equipment:
Radiant section tubes for ethylene cracking furnaces;
High-temperature heat exchangers for fourth-generation nuclear power plants;
Chemical Equipment:
Synthetic ammonia reformer tubes;
Coal chemical gasifier nozzles;
Special Applications: Aerospace engine combustion chamber liners. 4. Comparison with Similar Materials
vs. A31254 (254SMO):
Higher nickel content, 3x higher high-temperature strength;
Slightly weaker chloride corrosion resistance, but 40% lower cost;
vs. N08800 (Incoloy 800):
Higher carbon content, 50% higher creep resistance.
5. Procurement and Processing Key Points
Key Certifications: High-temperature endurance test report (815°C/100,000 hours extrapolated) is required.
Processing Warnings:
Hot forming requires argon atmosphere protection (to prevent surface oxidation).
Sulfur-containing cutting fluids are prohibited.
