What is the difference between hot rolled steel and cold rolled steel?

The carbon content of hot-rolled steel sheet is higher than that of cold-rolled steel sheet. Hot rolled steel sheet has low hardness, easy processing and good ductility. Cold-rolled sheet has high hardness and is relatively difficult to process, but it is not easy to deform and has high strength.The production process of hot-rolled steel plate and cold-rolled steel plate is different, hot-rolled steel is rolled at high temperature, while cold-rolled steel is rolled at room temperature. The general thickness of cold rolling is relatively small, and the hot rolling can be larger.

2. 标题：Tianjin is an important steel production base in China.

For a long time, tianjin Iron and steel industry has provided important raw material guarantee for the economic construction of the whole globe and the whole country, effectively supported the development of related industries, promoted the industrialization and modernization process of the whole province, and promoted the improvement of people's livelihood and social sustainable development.

3.标题：Carbon steel

Carbon steel is a steel with carbon content from about 0.05 up to 2.1 percent by weight.Mild steel (iron containing a small percentage of carbon, strong and tough but not readily tempered), also known as plain-carbon steel and low-carbon steel, is now the most common form of steel because its price is relatively low while it provides material properties that are acceptable for many applications. Mild steel contains approximately 0.05–0.30% carbon. Mild steel has a relatively low tensile strength, but it is cheap and easy to form; surface hardness can be increased through carburizing.