1. Equivalent Grades of Various Standards
- UNS: S31008
- ASTM: TP310S
- EN: 1.4845
- GB: 06Cr25Ni20
- JIS: SUS310S
2. Chemical Composition (wt%, typical value)
C ≤0.08%, Cr:24.00~26.00%, Ni:19.00~22.00%, Mn ≤2.00%, Si ≤1.50%, P ≤0.045%, S ≤0.030%, balance Fe.
3. Production Process
3.1 Smelting and Continuous Casting
Raw materials are melted in EAF and refined by AOD furnace for precise chemical composition control. Molten steel is continuously cast into slabs with electromagnetic stirring; slabs go through surface grinding to remove surface flaws.
3.2 Hot Rolling
Slabs are heated to 1180~1250℃, followed by rough rolling and finish rolling into hot rolled coils. After high-temperature annealing and mixed acid pickling, hot rolled pickled coils are obtained as cold rolling feedstock.
3.3 Cold Rolling for Finished Coil
Pickled hot coil → degreasing → multi-pass cold rolling → continuous high-temperature solution annealing → pickling & passivation → skin pass leveling → slitting, inspection and packaging.
4. Product Characteristics & Physical Properties
Mechanical Properties (Solution Annealed Status)
Yield strength ≥205 MPa, Tensile strength ≥520 MPa, Elongation ≥40%, HB ≤201.
Physical Features
High thermal expansion coefficient; fully annealed material is basically non-magnetic, slight magnetism occurs after cold processing.
Advantages
- Excellent high-temperature oxidation resistance, continuous service temperature up to 1000~1050℃, outstanding anti-scaling property under high-temperature oxidizing atmosphere.
- Superior high-temperature creep strength and thermal fatigue performance, stable structure under alternating high and low temperature.
- Good corrosion resistance against high-temperature flue gas, sulfur-containing atmosphere and moderate acid corrosion; excellent weldability and forming property.
5. Main Applications
- High-temperature Furnace Industry: Furnace inner lining, furnace roller, heat treatment fixture, muffle furnace component.
- Petrochemical & Thermal Power: Boiler high-temperature flue duct, cracking furnace lining, waste incinerator high-temperature inner plate, heat exchanger sheet under high-temperature corrosive gas.
- Heat Treatment Equipment: Continuous annealing furnace lining, heating basket, high-temperature conveyor belt base material.
- Other High-temperature Equipment: Ceramic kiln accessories, high-temperature combustion equipment parts.
