Product Overview
Cold Rolled Spring Steel Strip is a premium, high-carbon alloy steel strip manufactured through precision cold rolling and advanced atmosphere-controlled heat treatment. Compared to standard mild steel, our spring steel strips deliver significantly higher tensile strength, superior elastic limit, outstanding fatigue life, and exceptional dimensional tolerance control.
It is the premier material choice for manufacturing high-performance springs, blades, and complex elastic components subjected to repeated high-stress cycles. We supply a comprehensive portfolio of spring steel strips in various international grades, thicknesses, widths, edge treatments, and customized hardness ranges to align perfectly with your global manufacturing standards.
Key Advantages
Superior Elastic Recovery & High Strength: An exceptional yield-to-tensile strength ratio allows components to undergo extreme deflection and return to their original shape without permanent deformation.
Ultra-Precise Dimensional Tolerances: Utilizing high-precision Sendzimir 20-high cold rolling mills equipped with advanced AGC (Automatic Gauge Control) systems, we maintain tight thickness and width tolerances. This uniformity guarantees consistent stamping feeding and high-yield production runs.
Excellent Fatigue and Wear Resistance: Engineered with a highly uniform microstructure, our spring steel strips resist micro-cracking and structural fatigue. For instance, our alloyed 51CrV4/50CrV4 grades are optimized to withstand over 10 million compression cycles without load loss under prolonged, high-frequency dynamic loading.
Impeccable Surface Integrity: Processed under controlled protective atmospheres (hydrogen-bell annealing) to prevent decarburization, ensuring a clean, uniform finish. Available in bright, polished, blue-tempered, and rust-protective oiled finishes.
Technical Specifications & Material Grades
|
EN Standard (DIN) |
AISI/SAE (US) |
JIS (Japan) |
GB (China) |
Key Characteristics & Typical Applications |
|
C67S / C75S |
1070 / 1074 |
SUP6 / S70C |
65 / 70 |
Balanced strength and ductility; widely used for flat springs, clips, and washers. |
|
C85S / C100S |
1084 / 1095 |
SK5 / SK85 |
85 / T8 |
Very high carbon content; superior hardness and wear resistance post-heat treatment. Ideal for blades, saws, and highly stressed springs. |
|
51CrV4 / 50CrV4 |
6150 |
SUP10 |
50CrVA |
Chromium-vanadium alloyed; exceptional fatigue life, high toughness, and shock resistance for heavy-duty automotive & industrial applications. |
|
65Mn |
1065 |
S65C |
65Mn |
Outstanding hardenability and cost-efficiency; widely used for agricultural machinery parts and hand tools. |
Technical Parameters
Thickness Range: 0.10 mm - 3.00 mm (Standard tolerance pm0.01 mm; precise tolerance up to pm0.005 mm available upon request)
Width Range: 10 mm - 600 mm (Precision slitting width tolerance up to pm0.005 mm)
Edge Condition: Slit Edge (sheared), Mill Edge (raw), or Deburred / Rounded / Chamfered Edge
Surface Finish: Bright, Polished, Blue-tempered, Yellow-tempered, Grey-phosphated, Oiled (Rust-preventive)
Delivery Hardness: Annealed (Soft/LC for easy forming), Cold Rolled (Semi-hard/Full-hard), Hardened & Tempered (Ready-to-use elasticity)
Delivery Form: Standard Ribbon-wound Coils, Oscillated Winding Coils (for high-speed continuous stamping with minimum downtime), or Cut-to-length Strips
Execution Standards: EN 10132-4, ASTM A684, JIS G4802, GB/T 3525
Minimum Order Quantity (MOQ): Generally 1 to 3 tons per size for customized production. Trial orders and stock specifications are negotiable.
Manufacturing Process & Quality Control
Our rigorous quality assurance system monitors every stage of the production cycle to guarantee absolute batch-to-batch consistency:
Premium Raw Material Selection: We source high-purity, vacuum-degassed hot rolled coils with minimal non-metallic inclusions to prevent micro-defects.
Acid Pickling: Complete removal of surface oxides and scale to prepare an optimal substrate for cold reduction.
Precision Cold Rolling: Multi-pass rolling on high-precision mills achieves specified thickness uniformity and grain refinement.
Controlled Atmosphere Heat Treatment: Utilizing advanced hydrogen-bell annealing or continuous hardening & tempering lines to precisely engineer the requested mechanical properties and hardness profiles without decarburization.
Precision Slitting: Advanced rotary shear slitting lines cut the coils to customized widths with minimal burr.
Comprehensive Inspection: Our in-house laboratory-equipped with Spectro chemical analyzers, Vickers/Rockwell hardness testers, and metallographic microscopes-tests every batch for chemical composition, tolerances, tensile strength, elongation, hardness (HV/HRB/HRC), and surface roughness before dispatch.
Proven Application Solutions
Our premium spring steel strips are trusted by leading global OEMs and manufacturers across key industries:
Automotive Industry (Tier-1 Solutions): Clutch diaphragm springs, seat belt retracting springs, brake noise-damping shims, suspension clips, and engine valves.
Electronics & Electrical Engineering: High-durability micro-switch contacts, connector terminals, grounding clips, and precision diaphragms.
Industrial Tools & Blades: Professional band saws, circular saw blades, doctor blades for the printing industry, construction trowels, utility knives, and heavy-duty measuring tapes.
General Machinery & Hardware: High-stress Belleville spring washers, wave washers, spiral springs, retaining rings, and customized stamping components.
FAQ
