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Bright annealing steel coil
Electronics Industry：Precision connectors, sensor housings, micro-electronic component substrates
Medical Devices：Surgical instrument parts, medical catheter support structures
Precision Instruments：Instrument housings, core components of measuring equipment
Food Packaging：Inner material of high-end stainless steel food containers
Aerospace：Processing raw materials for small precision parts
2.Product Advantages
High-Quality Surface：Oxide-free via vacuum annealing, high smoothness, no secondary polishing needed
Excellent Precision：Small dimensional tolerance, suitable for precision part processing
Stable Performance：Balances toughness and corrosion resistance, applicable to harsh working conditions
Easy Processing：Easy to stamp and bend, improving production efficiency
High Cleanliness：Impurity-free surface, meets hygiene standards of medical/food industries
3.Technical Parameters
Parameter | Specification Range | Standard / Notes |
Steel Grade | 304, 316L, 201, ASTM A240 | GB/T / EN / ASTM |
Coil Thickness | 0.1–2.0 mm | ±0.02 mm tolerance |
Coil Width | 500–1250 mm | ±1 mm tolerance |
Inner Diameter | 508 mm | Standard size |
Outer Diameter | 800–1500 mm | Custom available |
Surface Roughness | Ra≤0.8 μm | As-annealed standard |
Tensile Strength | 500–700 MPa | GB/T 228.1 standard |
Yield Strength | 200–300 MPa | GB/T 228.1 standard |
Elongation | ≥35% | GB/T 228.1 standard |
Surface Treatment | Bright annealed, Pickled | Custom: Passivated |
4.Production process
Raw Material Preparation: Degrease and decontaminate cold-rolled steel coil surface for cleanliness
Sealed Furnacing: Load coil into airtight annealing furnace, fill with nitrogen/hydrogen protective gas
Bright Annealing: Heat to 700–900℃ for insulation, relieve stress and enhance plasticity in oxygen-free environment
Cooling & Discharging: Slow cooling with furnace to avoid oxidation and maintain bright & clean surface
Finishing & Packaging: Trim, level and inspect, then moisture-proof package for warehousing
5.FAQ
Q1:What’s the difference between bright annealing and ordinary annealing?
A1:Bright annealing is done in vacuum, no surface oxidation; ordinary annealing easily produces oxide scale, requiring extra treatment.
Q2:Can this product be welded?
A2:Yes, but inert gas shielded welding is required to avoid oxidation in the welding area affecting smoothness.
Q3:What to note for storage?
A3:Store in a dry and clean environment, avoid contact with acid-base substances to prevent surface contamination or corrosion.
Q4:Which parameters can be customized?
A4:Thickness, width, grade and surface roughness can be customized to meet different scenario needs.
If you want to know more, please feel free to contact us.
