It is a flat - plate - shaped steel material that is poured with molten steel and pressed after cooling.

Standards for Cold - Rolled Sheets 1. Domestic Standards At present, the standards for cold - rolled sheets in China's steel industry mainly consist of the following three standards: "GB/T 708 - 2006": Cold - rolled Steel Plates and Strips. This standard stipulates the requirements for the classification, specifications, surface quality, allowable deviations, weight, marking, and quality certificates of cold - rolled steel plates and strips. "GB/T 11253 - 2007": Test Methods for Mechanical Properties of Cold - rolled Sheet Materials. This standard prescribes the methods and requirements for tensile tests, bending tests, impact tests, and hardness tests on cold - rolled sheets. "GB/T 1335 - 2005": Classification of Surface Defects on Cold - rolled Sheets. This standard specifies the classification methods for surface defects on cold - rolled sheets. 2. International Standards In addition to domestic standards, international standards also have corresponding regulations for cold - rolled sheets. There are mainly the following two standards: EN10130: A standard issued by the European Steel Standardization Organization, applicable to cold - rolled sheets and strips. ASTM A1008: A standard issued by the American Society for Testing and Materials, applicable to cold - rolled sheets and strips. Standards for Hot - Rolled Sheets 1. Domestic Standards At present, the standards for hot - rolled sheets in China's steel industry mainly consist of the following three standards: "GB/T 700 - 2006": Hot - rolled Carbon Structural Steel Plates and Strips. This standard stipulates the requirements for the classification, specifications, surface quality, allowable deviations, weight, marking, and quality certificates of hot - rolled steel plates and strips. "GB/T 1591 - 2008": Hot - rolled and Heat - treated High - strength Low - alloy Structural Steel Plates. This standard prescribes the requirements for the classification, specifications, surface quality, allowable deviations, weight, marking, and quality certificates of hot - rolled and heat - treated high - strength low - alloy structural steel plates. "GB/T 24590 - 2009": Technical Conditions for Manufacturing High - strength Steel Plates for Automobiles by Tension - strain - controlled Rolling. This standard specifies the requirements for manufacturing technical conditions of high - strength steel plates for automobiles. 2. International Standards International standards also have corresponding regulations for hot - rolled sheets. There are mainly the following two standards: EN 10025: A standard issued by the European Steel Standardization Organization, applicable to hot - rolled non - alloy structural steels. ASTM A36: A standard issued by the American Society for Testing and Materials, applicable to general hot - rolled structural steels.