Hot rolled steel coil is made from slab (mainly continuous casting slab) as raw material, which is heated and produced into strip steel by roughing and finishing mills. The hot steel strip from the last rolling mill of the finishing mill is cooled by laminar flow to the set temperature, and then coiled into a steel strip coil by a coiler. The cooled steel strip coil is then produced. Due to its excellent properties such as high strength, high toughness, corrosion resistance, easy processing and good weld ability, hot-rolled steel plate products are widely used in manufacturing industries such as ships, automobiles, bridges, construction, machinery, and pressure vessels.
The size range of hot coils mainly includes thickness, width, and length, as follows:
thickness range
Common thickness: 1.2mm to 25.4mm, typical specifications include 2.0mm, 3.0mm, 5.0mm, etc.
width range
General width: 1000mm to 2000mm, common specifications include 1250mm and 1500mm.
length range
The length can be customized, commonly 6000mm, 8000mm, and some requirements can reach 12000mm.
The materials of hot-rolled coils mainly include Q195, Q235, Q345, 510L, SS330, SS400, SS490, SS540, etc. The naming of these materials follows certain rules, where "Q" represents the yield point of steel, "number" represents the quality grade, and "quality grade symbol" includes four grades: A, B, C, and D. In addition, the "deoxidation method symbol" is used to distinguish different types of steel, such as F for boiling steel, b for semi killed steel, Z for killed steel, and TZ for special killed steel. It should be noted that calm steel can be named without symbols, for example, Q235-AF represents A-grade boiling steel.
SPHC - In this label, S represents Steel, P represents Plate, H represents Heat, and C represents Commercial, indicating that this material is a general-purpose hot-rolled steel plate and strip.
SPHD - In this marker, also starting with S, represents steel; P represents the board; H represents hot rolling; And D indicates that this material is particularly suitable for stamping purposes, therefore, it represents hot-rolled steel plates and strips for stamping.
SPHE - Here, S, P, and H have the same meaning as the first two markings, while E indicates that this material is suitable for deep drawing purposes, so it represents hot-rolled steel plates and strips for deep drawing.
SPCC - In this symbol, the meanings of S and P remain the same as before, with C representing Cold rolling and the third letter followed by C representing carbon steel. If a tensile test is required, add T at the end of the grade, which is SPCCT.
SPCD - This mark is used to indicate cold-rolled carbon steel sheets and strips suitable for stamping purposes.
SPCE - This mark represents cold-rolled carbon steel sheets and strips for deep drawing purposes. If non timeliness needs to be ensured, N can be added at the end of the grade to become SPCEN.
