440C Stainless Steel Coil
440C Stainless Steel Coil is a high-carbon, high-chromium martensitic stainless steel known for its exceptional hardness, wear resistance, and moderate corrosion resistance. It is one of the highest carbon grades in the 440 series, making it ideal for applications requiring a sharp cutting edge, high strength, and resistance to abrasion.
Key Features:
High Hardness: After heat treatment, 440C can achieve a hardness of up to 58–60 HRC (Rockwell Hardness), making it suitable for cutting tools, bearings, and wear-resistant components.
Excellent Wear Resistance: The high carbon content forms hard chromium carbides, which enhance resistance to abrasion and surface wear.
Moderate Corrosion Resistance: While not as corrosion-resistant as austenitic grades like 304 or 316, 440C offers good resistance to mild corrosive environments, especially when properly heat-treated and passivated.
High Strength & Toughness: It maintains good mechanical strength and toughness even at high hardness levels, making it reliable for high-stress applications.
Magnetic Properties: As a martensitic stainless steel, 440C is magnetic in all conditions.
Heat Treatment:
440C stainless steel requires heat treatment to achieve its optimal properties:
Hardening: Heat to 1010–1065°C (1850–1950°F), then oil or air quench.
Tempering: Temper at 150–370°C (300–700°F) to reduce brittleness while maintaining hardness. Double tempering is often recommended for best results.
Common Applications:
Cutlery & Blades: High-end knives, surgical instruments, and razor blades due to its ability to hold a sharp edge.
Bearings & Bushings: High-precision ball bearings, roller bearings, and wear rings in corrosive environments.
Molds & Dies: Plastic injection molds and die-casting dies where wear resistance and polishability are critical.
Valve Components: Valve seats, balls, and stems in chemical and petrochemical applications.
Measuring Tools: Precision gauges and cutting tools requiring dimensional stability and wear resistance.
Available Forms & Finishes:
440C stainless steel coils are available in annealed or pre-hardened conditions, with surface finishes including:
Annealed: Soft, machinable condition for further processing.
Pre-hardened: Heat-treated to a specific hardness for direct use in components.
Polished: High surface finish for molds, bearings, and decorative applications.
Limitations:
Weldability: Poor weldability due to high carbon content; welding may require pre- and post-heat treatment to avoid cracking.
Machinability: More difficult to machine than lower-carbon stainless steels, especially in the annealed condition.
Corrosion Resistance: Lower than austenitic grades; not recommended for highly corrosive environments like seawater or strong acids.
In summary, 440C Stainless Steel Coil is a premium material for applications demanding high hardness, wear resistance, and edge retention. Its combination of strength and moderate corrosion resistance makes it a top choice for precision tools, bearings, and high-performance components across various industries.
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