열간 압연 및 냉간 압연은 모두 강판 또는 프로파일 성형 공정입니다. 이는 강철의 구조와 특성에 중요한 영향을 미칩니다.
이번 글에서는 주방 싱크대에 사용되는 두 가지 철재 가공 방법에 대해 설명했습니다. 여기에는 둘 사이의 차이점과 어떤 것이 가장 적합한지와 같은 정보가 포함됩니다. 스테인레스 스틸 싱크.
바로 시작합시다!
열간압연
스테인레스 열연판은 두께 3mm~16mm 사이의 강판으로 표면이 공업적인 표면을 갖고 있으며, 무광택 표면 마감.
열간 압연과 냉간 압연은 모두 강판이나 프로파일을 형성할 수 있는 공정입니다. 믿거나 말거나, 강철이 압연되는 방식은 특성과 강철 구조에 상당한 영향을 미칩니다.
일반적으로 강철을 압연하려면 1100~1250도까지 가열해야 합니다. 빌렛이나 강괴는 실온에서 변형되기 어렵기 때문입니다. 가열하지 않으면 가공하기 어렵습니다.
이렇게 강을 가열하여 압연하는 과정을 열간압연이라고 합니다.
강의 압연은 주로 열간 압연이며, 냉간 압연은 작은 단면의 강과 얇은 판을 생산하는 데에만 사용됩니다.
이는 많은 강철의 재결정 온도보다 높습니다. 이러한 온도에서는 강철을 성형하는 것이 훨씬 쉽고 제품 생산도 훨씬 편리합니다.
열간압연 종료온도는 일반적으로 800~900℃이며, 그 후 일반적으로 공기 중에서 냉각된다. 따라서 열간 압연 상태는 노멀라이징 상태와 동일합니다.
열간 압연 강철을 가공하기 위해 빌렛이라고 불리는 단일 직사각형 금속판으로 시작합니다. 먼저 빌렛을 가열한 후 전처리를 위해 보냅니다. 이 과정에서 빌렛은 큰 롤로 편평화됩니다.
그 후, 강판은 매우 높은 온도에서 일련의 롤러를 통해 가공됩니다. 완성된 치수에 도달할 때까지 이 과정을 반복합니다.
You spin the rolled steel into coils for sheet metal, and then you leave it to cool. For other forms of metal, such as bars or plates, you section materials and package them.
After that, the steel is left to cool. The size of the steel may reduce as steel shrinks a little when the temperature drops. This reduces the control over the final shape of hot-rolled steel. It isn’t suitable for materials with precision applications.
Most steel products are rolled by hot rolling. Due to the high temperature, the steel delivered in the hot-rolled state has a layer of iron oxide on the surface. This has specific corrosion resistance and can be stored in the open air.
However, this layer of scale also makes the surface of hot-rolled steel rough, and the size fluctuates wildly.
Therefore, steel with a smooth surface, accurate dimensions, and good mechanical properties are required. Cold-rolled semi-finished products or finished products are used as raw materials.
Advantages of Hot Rolling
●Hot rolled steel is very easy to make as compared to cold rolled steel.
● It is also cheaper than cold-rolled steel.
● It’s also free of any internal quenching, which is a pro.
Disadvantages of Hot Rolling
● The steel has slight distortions.
●May appear some dimensional imperfections.
Cold Rolling
A cold-rolled stainless steel plate is a steel plate with a thickness of 6mm or less, and the surface is 2B and bright finished.
In cold rolling, you squeeze the steel with intense pressure. This is all done at average temperatures, so it is a challenging task to do. The pressure changes the steel’s shape.
The intense pressure will slightly increase the steel’s temperature, but this process is still called cold rolling. The steel coil formed by hot rolling is sometimes used as raw material. You can remove the oxide scale by pickling so that the pressure is processed.
Cold rolling poses advantage in that the surface is smoother due to no use of heat. It is better because of pickling as well.
However, continuous cold deformation changes the shape of the steel slightly. The hardness and strength of the steel are increased due to the cold work hardening. But, at the same time, the power of the plastic index is decreased.
However, for end-use, the stamping performance of the steel deteriorates because of cold rolling. And, this end product is appropriate only for simple deformed parts.
Advantages of Cold Rolling
● The most significant advantage of cold-rolled steel is the proper shape.
● Moreover, there are more variations when it comes to cold-rolled steel, which offers a smoother surface.
Disadvantages of Cold Rolling
● The steel is more expensive at the same time.
● Also, there are relatively lesser shapes available for cold-rolled steel.
The Main Difference Between Hot Rolled And Cold Rolled Steel
One of the main differences between the two variants is the temperature at which they are processed.
When it comes to hot rolling, the steel plate is processed at very high temperatures. Cold rolling usually refers to processing done at a lower temperature, usually room temperature.
Both of these processing techniques can affect the overall performance of the steel. It also changes the potential applications of the steel plate.
Knowing which type of steel to use can significantly reduce the raw material spending and can reduce wastage.
결론
Both hot-rolled and cold-rolled steel have certain advantages and disadvantages. Some of these might be clearer after knowing more about the manufacturing processes of both sheets of steel.
I hope this information helps you in deciding on which alternative to go for.
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