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Help CenterSteel Coil & Strip & Cold Rolled Steel Coil，SPCC、DC01、Q195、Q235、DC03、DC04、DC05、SPCD、SPCE、Q345、HC340LA、HC420LA
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1. Product Overview
Cold rolled coils are produced with pickled hot rolled coils as raw material through multi-pass cold rolling at room temperature. Raw materials only include carbon steel and high-strength low-alloy steel without stainless steel. Featuring high dimensional accuracy, smooth flat surface and uniform ultra-thin thickness, they have excellent stamping and bending performance. The coils can be directly painted, electroplated and stamped without polishing, serving as core raw materials for home appliances, auto parts, hardware and precision structural components.
Application Scenarios
Automotive inner & outer panels, chassis stamping parts, home appliance housings, power distribution cabinet shells, furniture hardware, precision instrument casings, substrate for galvanized and color coated steel, stamping pipe fittings, motor housings, thin plate components for storage racks.
Delivery Lead Time
Standard spot sizes can be delivered within 5-7 days; customized orders of ultra-thin thickness, high-strength grades, special surface roughness and cut-to-length slitting take 10-15 days, shipped in full containers from Tianjin Port.
2. Executive Standards & Common Steel Grades
Domestic Standards
GB/T 700, GB/T 1591, GB/T 13237, GB/T 5213, GB/T 3274
International Standards
ASTM A1008, EN 10130, JIS G3131, JIS G3105
Common Grades (Carbon & Low Alloy Steel)
Ordinary stamping cold rolled steel: SPCC, DC01, Q195, Q235
Deep drawing steel: DC03, DC04, DC05, SPCD, SPCE
HSLA cold rolled coils: Q345, HC340LA, HC420LA
Overseas standard grades: ST12, ST13, ST14
3. Specifications
Thickness: 0.15mm–3.0mm
Width: 600mm–1850mm, narrow strips available via longitudinal slitting
Standard inner coil diameter: Φ508mm, Φ610mm
Coil weight: 3–18 tons per coil, small split coils upon request
Delivery condition: Bright annealed, skin passed; surface finish FB, MB, MA optional
Processing options: Cut to length sheets, longitudinal slitting, stamping, bending, film coating
4. Manufacturing Process
Uncoiling pickled hot rolled coils → strip welding → multi-stand cold rolling at ambient temperature → laminar cooling → bell-type bright annealing → skin pass leveling → surface passivation & oil coating → on-line dimension & surface inspection → recoiling / flattening → packing & warehousingCold rolling greatly improves dimensional precision; bright annealing eliminates work hardening to guarantee sufficient ductility for crack-free deep drawing.
5. Core Performance Advantages
Ultra-precise dimension: Tight tolerance on thickness and width, high flatness to reduce processing waste
Scale-free bright surface: Strong adhesion for direct painting and electroplating without grinding
Excellent deep drawability: Deep drawing grades support complex forming for auto and appliance shells
Adjustable surface treatment: Custom passivation and anti-rust oil film for subsequent galvanizing and color coating
Complete thin gauge range to lower production cost of lightweight parts
6. Full Inspection for Every Coil
Spectral chemical composition test for raw material to control carbon, manganese and silicon content
Mechanical tests: Yield strength, tensile strength, elongation, n-value & r-value for stamping performance
Cold bending and cupping test to verify deep drawing capacity
Online laser thickness & width measurement for full-process dimension monitoring
Complete surface inspection to eliminate scratches, roll marks, spots and scabsMaterial test report, mechanical inspection certificate and original quality guarantee certificate are provided for each coil.
Quality Warranty
Full replacement or compensation available for defective products caused by unqualified material, out-of-tolerance thickness, surface scratches and internal lamination.
7. Surface Treatment & Packing
Surface finish: Bright cold rolled surface with passivation treatment and uniform stamping anti-rust oil coating
Protective film: PE film attached for high-grade coils to avoid scratches during transportation and processing
Packing: Reinforced by cross steel straps, wrapped with inner waterproof plastic film and outer tarpaulin, equipped with coil corner protectors for moisture and collision resistance during sea container transportation.
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