Cold Rolled Steel Production Overview:
Cold rolled hardened and tempered steel strip coils and sheets are specialized steel products that have undergone a series of precise manufacturing processes to achieve desired mechanical properties. These materials are commonly used in applications where high strength, excellent wear resistance, and controlled hardness are critical factors, such as in the production of cutting tools, lò xo, Thành phần ô tô, and various industrial machinery parts.
Manufacturing Process:
1.Cuộn lạnh:The initial process involves cold rolling the steel strip or sheet at room temperature or below its recrystallization temperature. This reduces the thickness of the material and enhances its surface finish while improving its dimensional accuracy and mechanical properties, such as tensile strength and yield strength.
2. Hardening (Làm dịu đi): After cold rolling, the steel is heat-treated by heating it to an austenitizing temperature, which allows the carbon and other alloying elements to be uniformly distributed throughout the matrix structure. Once the desired temperature is reached, the material is rapidly cooled (dập tắt) to form a hard martensitic microstructure, resulting in increased hardness but also brittleness.
3. Ủ:To balance out the hardness with ductility, the quenched steel is then reheated to a specific temperature below the original hardening temperature. This tempering process helps relieve internal stresses and modifies the microstructure to achieve the right combination of hardness, độ dẻo dai, and elasticity for the intended application.
Characteristics of Cold Rolled Hardened & Dải thép nóng tính & Sheets:
High Strength: Due to the careful control of the hardening and tempering process, these steel products exhibit significantly higher strength than their non-treated counterparts.
Wear Resistance: The hardened and tempered condition provides a tough, durable surface that resists abrasion and deformation over time, making it ideal for applications where friction and wear are concerns.
Dimensional Stability: Cold rolling ensures tight tolerances and flatness, which is crucial in applications requiring close fitting or machining.
Workability: Despite being hardened and tempered, these steels often retain some degree of workability, allowing for further shaping and forming operations if necessary.
Ứng dụng:
Cutting tools: những con dao, scissors, plaster knives, lưỡi cưa tròn, wood saws, food saws, band saws, cưa thịt, vân vân.
Sản xuất mùa xuân: Ideal for coil springs, rolling door fittings, leaf springs and torsion bars as they can withstand repeated bending without failure.
Auto parts: engine valve springs, transmission gears, suspension components, clutch plates, seat belt inserts, gaskets and automotive washers, vân vân.
Architectural Hardware: Hinges, door locks and door closers benefit from enhanced durability.
Electrical appliances and furniture parts: lò xo, clock springs, shoe irons, industrial knives, fasteners and load-bearing parts, vân vân.
| Cold rolled hardened&tempered steel strip/ coil/ sheet. | |||||
| Delivery condition (Steel-sheet/strip/coil) | Grand based on DIN standard | Prime steel strip/coil/shet heat-treated of commonly specifications, độ cứng, process method | |||
| Cold rolled | Cứng&Nóng tính | ||||
| 21Hrc<độ cứng<29Hrc | 29Hrc<độ cứng<55Hrc | ||||
| độ dày | chiều rộng | độ dày | chiều rộng | ||
| High carbon steel | CK45,K50,CK55, CK60,CK67, CK70,CK75, vân vân. | 0.08-4.0mm | 8-320mm | 0.08-3.0mm | 8-300mm |
| Alloy steel | 50CrV4,C75Cr1,51CrV4, 60Si2Mn etc. | 0.08-4.0mm | 8-320mm | 0.08-3.0mm | 8-300mm |
| Stainless spring steel | 420J2 etc. | 0.08-4.0mm | 8-1200mm | 0.08-3.0mm | 8-300mm |
| Edge process | Khe hở / round / quảng trường. | ||||
| Sức chịu đựng | Thickness +/-0.03mm max; width +/-0.05mm max | ||||
| Surface | Polished (màu xanh da trời, màu vàng, trắng, gray-blue, đen, sáng) hoặc Thiên nhiên, v.v. | ||||
| Physical property | Tensile strength: 450-1850N/mm2 | ||||
| Đóng gói | Each bundle firmed with high tensile steel packing straps, then wrapped with water-resistant paper for standard seaworthy packing | ||||
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