Обзор производства холоднокатаной стали:
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, источники, автомобильные компоненты, and various industrial machinery parts.
Производственный процесс:
1.Холодная прокатка: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. Закалка (закалка): После холодной прокатки, 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 (quenched) to form a hard martensitic microstructure, resulting in increased hardness but also brittleness.
3. Закалка: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, прочность, and elasticity for the intended application.
Characteristics of Cold Rolled Hardened & Tempered Steel Strips & Листы:
Высокая прочность: 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.
Приложения:
Режущие инструменты: knives, ножницы, ножи для гипса, дисковые пилы, пилы по дереву, пищевые пилы, ленточные пилы, пилы для мяса, и т. д..
Spring Manufacturing: 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, диски сцепления, seat belt inserts, gaskets and automotive washers, и т. д..
Architectural Hardware: Hinges, door locks and door closers benefit from enhanced durability.
Electrical appliances and furniture parts: источники, часовые пружины, shoe irons, industrial knives, fasteners and load-bearing parts, и т. д..
| Холоднокатаный закаленный&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, твердость, process method | |||
| Холоднокатаные | Закаленный&Закаленный | ||||
| 21Hrc<твердость<29Hrc | 29Hrc<твердость<55Hrc | ||||
| толщина | ширина | толщина | ширина | ||
| Высокая углеродная сталь | CK45,K50,CK55, CK60,CK67, CK70,CK75, и т. д.. | 0.08-4.0мм | 8-320мм | 0.08-3.0мм | 8-300мм |
| Alloy steel | 50CrV4,C75Cr1,51CrV4, 60Si2Mn и т. д.. | 0.08-4.0мм | 8-320мм | 0.08-3.0мм | 8-300мм |
| Stainless spring steel | 420J2 etc. | 0.08-4.0мм | 8-1200мм | 0.08-3.0мм | 8-300мм |
| Edge process | щель / круглый / квадрат. | ||||
| Толерантность | Thickness +/-0.03mm max; width +/-0.05mm max | ||||
| Поверхность | Полированный (синий, желтый, белый, gray-blue, черный, яркий) или Природа и т. д. | ||||
| Physical property | Предел прочности: 450-1850N/mm2 | ||||
| Упаковка | Each bundle firmed with high tensile steel packing straps, then wrapped with water-resistant paper for standard seaworthy packing | ||||
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