1. Material Definition and Standard Specifications
S31089 is a high-chromium-nickel austenitic heat-resistant stainless steel (corresponding to the Chinese designation 06Cr25Ni20). Its core characteristics and standards include:
Composition Design:
High-chromium-nickel base (Cr 24.0-26.0%, Ni 19.0-22.0%), providing extreme oxidation resistance;
Ultra-low carbon (C ≤ 0.08%), strictly controlled phosphorus and sulfur (P ≤ 0.045%, S ≤ 0.030%);
Implementation Standards: ASTM A312/A358 (American Standard), EN 10216-5 (European Standard), GB/T 14976 (Chinese Standard). 2. Core Performance Advantages
High-Temperature Oxidation Resistance:
Continuous operating temperature 1150°C, short-term resistance 1200°C;
Oxidation weight gain at 1100°C <1.0 mg/cm² (100-hour test);
Corrosion Resistance:
Resistant to nitric acid, molten alkali, and sulfiding environments (such as petrochemical cracking furnaces);
Passes ASTM A262 Practice E intergranular corrosion testing;
Processing Characteristics: Welding requires ER310 welding wire, preheating 150-200°C.
3. Typical Applications
Industrial Furnaces:
Radiant tubes for heat treatment furnaces, heat-resistant components for roller hearth kilns;
Inner linings for secondary combustion chambers of waste incinerators;
Energy Equipment:
High-temperature piping in coal chemical gasifiers;
Receiver tubes for solar thermal power generation;
Special Applications: Support for thermal insulation layers in aerospace engine tail nozzles. 4. Comparison with Similar Materials
vs. S30409 (304H):
Higher chromium and nickel content, 300°C higher oxidation temperature;
Cost 2-3 times higher, but lifespan extended 5 times;
vs. N06601 (Inconel 601):
Lower nickel content, 1/2 the cost;
Comparable performance in pure oxidizing environments.
5. Procurement and Processing Key Points
Key Tests:
High-temperature tensile test (800°C verification);
100% penetrant testing (PT) to detect surface cracks;
