Precision Thin Strip Stainless Steel Coil
Material Grade Spectrum
We supply precision thin strip across all major stainless steel families, each tailored to the specific forming, corrosion, and strength requirements of thin-gauge applications:
| Family | Representative Grades | Key Thin-Strip Advantage |
|---|---|---|
| Austenitic | 301, 304, 304L, 316L, 321 | Superior drawability and work-hardening control for deep-drawn micro-components; 301 available with tailored temper (1/4H, 1/2H, 3/4H, FH) |
| Ferritic | 430, 439, 443 | Low thermal expansion and magnetic permeability for solenoid cores, shielding, and heater elements |
| Martensitic | 410, 420J2 | Hardenable to high strength in thin sections; ideal for precision surgical blades and valve flapper valves |
| Precipitation Hardening | 17-7PH (631), 17-4PH (630) | Ultra-high strength after aging, with excellent fatigue life in spring and flexure applications |
| Specialty / High-Temp | Inconel 718, Hastelloy C-276 | Extreme corrosion and heat resistance for aerospace honeycomb seals, battery current collectors, and medical implant diaphragms |
Dimensional Capabilities & Tolerance Regime
Our precision thin strip is defined not merely by its gauge but by the tightness of its dimensional control:
| Parameter | Capability Range | Remarks |
|---|---|---|
| Thickness | 0.020 – 0.600 mm | Custom gauges available in 0.005 mm increments below 0.10 mm |
| Thickness Tolerance | ± 0.001 mm (for ≤0.10 mm) | Achieved via 20-high Sendzimir mill and continuous in-line gauge monitoring |
| Width | 1.5 – 650 mm | Slit from master coil with CNC slitting lines |
| Width Tolerance | ± 0.02 mm (for <100 mm width) | Precision rotary slitting with carbide tooling |
| Coil Inner Diameter | 76 mm, 152 mm, 300 mm | Plastic or steel spools per customer specification |
| Maximum Coil Outer Diameter | Up to 1200 mm | Single-coil weight up to 2 metric tons for long uninterrupted runs |
Surface Finishes & Engineered Conditions
In thin-strip applications, surface is never cosmetic-it is a functional interface. Our portfolio includes:
| Finish Designation | Ra (Typical) | Description | Primary Application |
|---|---|---|---|
| BA (Bright Annealed) | ≤ 0.05 μm | Mirror-like reflective surface achieved under controlled atmosphere; oxide-free | Medical electrodes, optical shutters, fuel cell bipolar plates |
| 2B / 2R (Matte / Dull) | 0.05 – 0.15 μm | Uniform matte finish via skin-pass rolling; excellent paint and adhesive adhesion | Gaskets, shims, flexure bearings, EMI shielding tape |
| Dull / Matte (2D base) | 0.15 – 0.40 μm | Non-reflective, low-glare surface | Camera aperture blades, solar panel edge connectors |
| Pre-Buffed / Colored | Custom | Chemical or PVD coloring on thin-gauge substrate available | Wearable electronics, decorative trim, luxury packaging |
| Custom Texture / Embossed | - | Micro-patterned surfaces (line, cross-hatch, dimple) | Battery electrode current collectors, heat exchanger plates |
Edge Conditions & Slitting Quality
The strip edge is a critical quality parameter that directly affects downstream feeding, stamping, and welding:
Deburred Square Edge (DSE): Standard for general stamping, with burr height controlled below 5% of strip thickness
Round Edge / Full Round Edge (RE/FRE): Specified for medical guide wires, tension bands, and applications involving human contact to eliminate cut hazard
Slit-Rolled Edge: Compressive rolling of the slit edge to relieve residual stress and prevent micro-crack propagation during subsequent forming
Mechanical Condition & Temper Designations
For austenitic grades (301, 304, 301S), we supply the full temper spectrum to match your forming-to-strength ratio:
| Temper | Typical Tensile Strength (MPa, 301) | Characteristic | Typical Use |
|---|---|---|---|
| Annealed (A) | ≥ 520 | Fully recrystallized, maximum ductility | Deep-drawn battery cans, complex progressive die parts |
| 1/4 Hard | 860 – 1000 | Moderate strength, still formable | Spring contacts, clips, modestly shaped brackets |
| 1/2 Hard | 1030 – 1200 | High strength, limited bend capability | Flat springs, snap rings, blade edges |
| 3/4 Hard | 1200 – 1400 | Very high strength, minimal forming | Shims, load-bearing washers, constant-force springs |
| Full Hard (FH) | ≥ 1400 | Maximum strength, essentially no post-form ductility | Slotted springs, tension bands, straight-cut sealing fins |
Key Application Clusters
Our precision thin strip coils serve as enabling material across multiple sectors where thin gauge, tight tolerance, and consistent properties are non-negotiable:
Medical & Life Sciences: Surgical blades, bone saws, endoscopic spring tubes, pacemaker electrode rings, dental file blanks
Automotive & New Energy: Fuel cell metallic bipolar plates, battery tab current collectors, ABS sensor rings, turbocharger sealing strips, EV battery burst discs
Electronics & Semiconductors: OLED mask frames, lead frames, EMI/RFI shielding spring fingers, camera module aperture blades, solder stencil foils
Aerospace & Defense: Honeycomb seal strips, engine shims, satellite flexible waveguides, pyrotechnic burst diaphragms
Precision Industrial: Textile needle blanks, doctor blades for gravure printing, die-cut valve flappers, shim stock for alignment, constant-force clock springs
Quality Assurance & Packaging
Mill Test Certificate (MTC) to EN 10204 3.1 or 3.2 issued with every coil, with full traceability to heat number
100% on-line inspection: Continuous thickness measurement via laser/isotope gauge, plus surface defect detection cameras for both sides
Packaging: Each coil individually vacuum-sealed with VCI (Volatile Corrosion Inhibitor) paper, secured on export-worthy fumigated plywood pallets or in moisture-proof steel crates for sea freight.
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