What is Cold-Rolled Steel?

Cold rolled steel is steel produced by cold rolling. Cold rolling is a method in which the No. 1 steel sheet is further thinned to a target thickness at room temperature. Compared with hot-rolled steel sheet, cold-rolled steel sheet has more accurate thickness, smooth and beautiful surface, and also has various superior mechanical properties, especially in terms of processability. Because cold-rolled raw coil is relatively brittle and hard to process, cold-rolled steel sheets are usually delivered to customers after annealing, pickling and surface leveling. The maximum thickness of cold-rolled steel is below 0.1-8.0MM. For example, the thickness of cold-rolled steel plates in most factories is below 4.5MM; the minimum thickness and width are determined according to the equipment capacity and market demand of each factory.

use

GB905: Cold-rolled round steel, square steel, hexagonal steel

GB708: Cold-rolled steel plate and strip

Grade	Delivery standard	Product size ()		use
		Nominal thickness	Nominal width
DC01, DC02, DC03, DC04, SPCC, SPCD, SPCE	GB / T 708 EN 10130: 1998 JISG3141: 2005	0.3 3.0	20 1600	Suitable for deep drawing parts of general forming knife

Its strength is high, but its toughness and weldability are poor, it is relatively hard, brittle, and its surface is bright.

DC01, DC02, DC03, DC04

Grade	Yield strength RcL Mpa	Tensile strength Rm Mpa	Elongation A80mm %	Plastic strain ratio r90	Strain hardening index n90
DC01	140 280	270 410	28
DC02	140 240	270 370	34	1.4
DC03	120 210	270 350	38	1.8	0.18
DC04	120 180	270 330	40	2.0	0.20

SPCC, SPCD, SPCE

Grade	Yield strength Relb) MPa	Tensile strength RmMPa	Plastic strain ratio r90e), d)	Strain hardening index n90d)
SPCC	130 ~ 300	270 ~ 410
SPCD	120 ~ 240	270 ~ 370	1.3
SPCE	120 ~ 210	270 ~ 350	1.8	0.18

Cold-rolled strip is a strip-shaped thin steel made by cold extrusion (without heating, otherwise called hot rolling). It is a material that rolls steel into the shape we want by cold water. It is made by a machine using a method of extrusion under very cold conditions to make a thin steel with a shape. This kind of processing form, and then cold processing to make the coils we need, including coils, coils, wire. Cold-rolled steel coils are also referred to as cold-rolled coils. Now that the steel processing problem is cold processing, the cold rolled steel coil convex defect has a very serious problem.

Foreign countries say that the main harm of steel coil uplift is that when the convex hull defect reaches a certain degree, the coil will form a local wave after uncoiling, which will affect the use of users. For the study of the hull defect of cold rolled steel coils, most people think that the cause of the bulge defect is the local high point of the strip caused by the local wear of the work rolls of the hot-rolled finishing rolling mill. Local wave shape. Cold rolled strip has been widely used in various fields due to its good surface flatness, smoothness, high stamping performance and dimensional accuracy, and its aging, low yield point, and good stamping properties, such as Construction, machinery, home appliances and coating industries. Its various advantages make it still widely used in various industries for a long time after its rapid rise ^[1] .