What is Differences Between Cold Rolled vs Hot Rolled Steel?

1、 Different carbon share

The carbon share of cold rolled steel plate can be slightly lower than that of hot rolled steel plate. The density is the same when the composition stalemate is small. But if the composition is very different, such as stainless steel. It also depends on the composition. The hot-rolled steel plate has better ductility, and the steel is also under pressure.

2、 Different density

Hot rolled steel plates are divided into structural steel, low carbon steel and welded bottle steel. Then find the steel you need according to various steels, and check the density and composition of specific steels.

Hot rolled steel plate has low hardness, easy processing and good ductility. The surface quality of hot-rolled steel plate is poor (oxidation finish is low), but the plasticity is good. It is generally medium and heavy plate, cold-rolled plate, high strength, high hardness and high surface finish. It is generally thin plate, which can be used as stamping plate.

Cold rolled steel plate has high hardness and relatively difficult processing, but it is not easy to deform and has high strength.

3、 Different production processes

The production process of cold-rolled steel plate is different from that of hot-rolled steel plate. Cold rolled steel plates are fried to the ground at room temperature. Hot rolled steel plate is rolled at high temperature. Generally speaking, cold-rolled steel plate has better strength and hot-rolled steel plate has better ductility. Generally, the thickness of cold-rolled steel plate is relatively small, and that of hot-rolled steel plate can be larger. The surface quality, appearance and dimensional accuracy of cold-rolled steel plate are better than those of hot-rolled steel plate, and the product thickness is right rolled to about 0.18mm.

The mechanical properties of hot-rolled steel plate are far inferior to cold working and forging, but it has better toughness and ductility.

Cold rolled steel plate has a certain degree of work hardening and low toughness, but it can achieve a good yield strength ratio. It is used for cold bending spring and other parts. At the same time, because the yield point is close to the tensile strength, it has no predictability of danger in the process of use, and accidents are easy to occur when the load exceeds the allowable load.

Differences Between Cold Rolled vs Hot Rolled Steel

How to distinguish between cold rolled steel plate and hot rolled steel plate?

1) The cold plate is cold rolled, and the surface is free of oxide skin, with good quality. Hot rolled steel plate is processed by hot rolling, with oxide skin on the surface and lower difference in plate thickness. Hot rolled steel plate has poor toughness and surface flatness, and the price is low, while cold rolled steel plate has good extensibility and toughness, but the price is expensive.

2) Rolling is divided into cold-rolled and hot-rolled steel plates, with recrystallization temperature as the distinguishing point.

3) The surface of hot-rolled steel plate (non electroplated) is black brown, and the surface of cold-rolled plate (non electroplated) is gray. After electroplating, it can be distinguished from the smoothness of the surface. The smoothness of cold-rolled plate is higher than that of hot-rolled plate.

Generally, when ordering hot-rolled steel plate or cold-rolled steel plate, there are clear product parameters. You can select the most cost-effective material for manufacturing according to specific application scenarios.

As a steel supplier in China, S0-Lucky Steel has more than 10 years of experience in the steel industry to help you quickly find suitable steel products. The product quality is guaranteed, and third-party appraisal can be carried out. At the same time, diversified logistics methods are available for you to choose and provide you with the best service.