30MnB5 Cold Press Steel Strip
Core Features
Alloy Composition Advantage
Carbon 0.27%-0.34%, manganese 1.10%-1.40%, boron 0.0005%-0.0030%, significantly improving hardenability. Quenched hardness reaches HRC 38-42, tensile strength ≥1000MPa, 50% higher wear resistance than ordinary carbon steel.
Cold-rolled structure is uniform and fine, yield strength ≥850MPa, elongation ≥12%, balancing high strength and formability for complex stamping.
Cold Rolling Precision
Thickness tolerance ±0.03mm (1.0-4.0mm), surface roughness Ra≤1.2μm, flatness ≤0.5mm/m, meeting precision stamping requirements.
Rolled by reversible cold mill, anisotropy deviation ≤8%, ensuring heat treatment deformation ≤0.05mm.
Heat Treatment Characteristics
Low critical quenching speed, suitable for induction quenching or carburizing. Tensile strength exceeds 1200MPa after heat treatment, impact toughness αk≥50J/cm².
Annealed to remove cold rolling stress, optional nickel plating (8-12μm) enhances welding strength (≥550MPa).
Application Scenarios
High-end Saw Blade Substrates: Manufacturing high-speed steel and ceramic saw blades, suitable for 200-800mm diameter cutting equipment at 10000rpm.
Automotive Components: Making chassis suspension springs and clutch pressure plates, with fatigue resistance ≥100,000 cycles.
Construction Machinery: As wear-resistant linings and gear blanks for high-load parts of excavators and loaders.
Technical Parameters
Parameter Type | Specific Indicators |
Chemical Composition | C:0.27%-0.34%, Mn:1.10%-1.40%, B:0.0005%-0.0030%, Si≤0.40%, P/S≤0.030% |
Thickness Range | 1.0-4.0mm (Common sizes: 1.5mm/2.0mm/2.5mm/3.0mm) |
Width Range | 150-800mm (Custom slitting to minimum 30mm) |
Length Range | 2000-8000mm (Coils or fixed-length plates) |
Mechanical Properties | Tensile strength ≥1000MPa, yield strength ≥850MPa, elongation ≥12%, hardness HB 300-350 |
Surface Condition | Cold-rolled bright surface (Ra≤1.2μm), free of oxide scale and cracks |
Packaging | Moisture-proof paper + wooden case, coil inner diameter Φ610mm, fixed-length plates ≤800kg per bundle |
Product Advantages
· High Strength & Hardenability: Boron improves heat treatment performance, reducing substrate fracture risk for high-load parts.
· Processing Stability: High dimensional accuracy with springback ≤0.1mm, suitable for automated mass production.
· Cost Optimization: 10%-15% lower cost than similar alloy steels, material utilization ≥98%.
· Environmental Compliance: Meets ISO 14001, no heavy metal emissions during heat treatment, suitable for green manufacturing.
