High Quality Cold Rolled W1 Steel Stainless Carbon Flat Bar Steel Sheets
ZCXH
Shandong,China
10-20 days
1000 tons/ month
Flat spring steel for leaf spring steel with SAE 9620 certification
Flat steel refers to steel with a width of 12-300mm, a thickness of 3-60mm, and a section of rectangular steel with slightly blunt edges.
High Carbon Content Drives Hardness: After heat treatment (quenching + tempering), W1 steel can achieve a surface hardness of 58–62 HRC (Rockwell Hardness), far exceeding low-carbon steels (typically ≤20 HRC). This hardness enables it to resist scratches, abrasion, and deformation under repeated friction—critical for tools or parts that require long-term wear resistance (e.g., blades, guides).
Uniform Hardness Distribution: Cold rolling refines the steel’s internal grain structure, and strict heat treatment control ensures hardness is evenly distributed across the material (no localized soft spots). For example, a W1 steel blade maintains sharpness longer than low-carbon alternatives because its entire cutting edge retains high hardness.
2. Superior Surface Quality & Dimensional Precision (Cold Rolled Advantage)
Smooth, Blemish-Free Surface: Cold rolling uses pressure to shape the steel at room temperature (without high-temperature oxidation), resulting in a surface roughness (Ra) as low as 0.4–1.6 μm—far smoother than hot-rolled steel (Ra ≥3.2 μm). The surface requires no additional grinding for most applications (e.g., decorative trim, precision tool bases).
Tight Dimensional Tolerance: Cold rolling minimizes thickness/width deviations:
For sheets: Thickness tolerance ≤±0.02mm (common thickness: 0.5–6mm);
For flat bars: Width tolerance ≤±0.1mm, thickness tolerance ≤±0.05mm (common specs: 5×10mm to 20×50mm). This precision avoids assembly gaps in high-precision equipment (e.g., machine tool guide rails, electronic component brackets).
3. Good Machinability (for Pre-Heat-Treatment Processing)
Easy to Cut & Form Before Hardening: In the "annealed state" (softened, hardness ~180–220 HB), W1 steel can be easily processed via milling, drilling, turning, or bending using conventional tools. For example, it can be cut into custom shapes (e.g., flat bar brackets) or punched with holes before heat treatment—avoiding the difficulty of machining hardened steel.
Low Tool Wear During Soft Machining: The annealed structure has low hardness, so cutting tools (e.g., high-speed steel drills) experience minimal wear, reducing processing costs and improving efficiency.
4. High Elasticity & Shape Stability
Good Elastic Recovery: After proper tempering, W1 steel retains high elasticity—able to return to its original shape after moderate bending or impact (e.g., springs, clips). For example, a W1 steel spring in a mechanical switch can withstand tens of thousands of cycles without permanent deformation.
Low Deformation After Processing: Cold rolling eliminates internal stress (via post-rolling annealing), so the material does not warp or shrink significantly during subsequent heat treatment or use. This stability is essential for precision parts (e.g., gauge blades, measuring tools).
5. Cost-Effective for High-Hardness Needs
Compared to high-alloy tool steels (e.g., HSS, D2) or stainless steels, W1 steel has:
Lower Raw Material Costs: It contains no expensive alloying elements (e.g., chromium, molybdenum) and uses mature cold rolling processes.
Simpler Heat Treatment: No complex alloy heat treatment is required—standard quenching (800–850°C) and tempering (150–200°C) can achieve target hardness, reducing processing costs.
