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Black Annealed Steel Coil
Hardware Stamping: Produce small hardware parts such as door lock accessories, hinges and stamping gaskets, suitable for mass stamping forming process.
Auto Parts: Manufacture non-load-bearing components like car seat brackets, door interior panel frames and trunk stamping parts.
Home Appliance Manufacturing: Applied to washing machine inner drum brackets, air conditioner shell reinforcing ribs and microwave oven chassis.
Furniture Industry: Processed into table and chair frame connectors, wardrobe hardware slides and bed frame stamping accessories.
Daily Necessities Manufacturing: Make stationery clips, kitchen storage racks and metal storage boxes and other light metal products.
2.Product Advantages
Excellent Formability: Low hardness after annealing, easy to stamp and bend without cracking or deformation.
Cost-Effective: Simple production process without complex surface treatment, suitable for mass procurement of small and medium sized enterprises.
Precise Dimensions: Strict tolerance control, high dimensional consistency of stamped parts, reducing subsequent processing procedures.
Uniform Surface: Dense and uniform black-gray oxide film provides short-term rust prevention, meeting storage and transportation requirements.
Wide Compatibility: Compatible with various stamping dies, can be processed into light structural parts of different shapes.
3.Technical Parameters
Parameter | Specification Range | Standard / Notes |
Steel Grade | SPCC, SPCD, DC01, ASTM A1008 | GB/T / EN / ASTM |
Coil Thickness | 0.2–3.0 mm | ±0.03 mm tolerance |
Coil Width | 600–1200 mm | ±2 mm tolerance |
Inner Diameter | 508 mm | Standard size |
Outer Diameter | 900–1600 mm | Custom available |
Hardness | HV90–120 | After annealing |
Tensile Strength | 300–450 MPa | GB/T 228.1 standard |
Yield Strength | 180–250 MPa | GB/T 228.1 standard |
Elongation | ≥30% | GB/T 228.1 standard |
Surface Treatment | Black annealed | Custom: Oil-coated |
4.Production process
Degrease and dedust low-carbon hot-rolled steel coil for clean surface.
Multi-pass cold rolling to target thickness and improve flatness.
Form dense black-gray oxide film during cooling for basic rust resistance.
Leveling, trimming, slitting & packaging for delivery.
5.FAQ
Q1:Will the black surface of black annealed steel coil fall off?
A1:No shedding under normal storage and processing conditions. If soaked in water or acid-base environment for a long time, the oxide film will be damaged gradually, and rust prevention treatment is required in time.
Q2:What is the difference between black annealed steel coil and bright annealed steel coil?
A2:Black annealing is carried out in a closed environment, with black-gray surface, low cost and focus on formability; bright annealing is in vacuum, with smooth surface, suitable for high-precision scenarios.
Q3:Can black annealed steel coil be directly sprayed?
A3:Yes, it can be sprayed directly. Dust and oil stains on the surface should be removed before spraying without extra polishing, and the coating adhesion is good.
Q4:Can the grade of black annealed steel coil be customized?
A4:Customization of common cold-rolled grades such as SPCC, SPCD and DC01 is supported, and annealing process parameters can be adjusted according to stamping difficulty.
If you want to know more, please feel free to contact us.
