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Cold rolled sheet products have been available for many, many years, and have been successfully used for a multitude of applications. Today's cold rolled sheet products are much improved over those used in the past. They offer better control of thickness, shape, width, surface finish, and other special quality features that compliment the emerging need for highly engineered end use applications.

The following information is intended to provide users of cold rolled sheet products with information to assist them in selecting and ordering the proper product to meet their end application.

The primary feature of cold reduction is to reduce the thickness of hot-rolled coils into thinner thicknesses that are not generally attainable in the hot rolled state. Clearly, controlling the sheet thickness along the entire length of the coil is very important to ensure that the product will perform consistently during the processing by the end user. In addition, there are a number of other product attributes that need to be controlled in the cold reduction process. Flatness (deviation from a flat plane) is one of the more important attributes. Very sophisticated strip-shape controlling technology is used to maintain good flatness. Surface finish is another product attribute that needs to be controlled during the cold-reduction process.

As one can see, there is much more to cold rolling than simply reducing the thickness to meet a customer’s ordered thickness. In fact, the hot-rolled, pickled coils incoming to the cold reduction mill have to have excellent quality attributes. The pickling operation must be well-controlled to assure that all the oxides formed during hot rolling are removed. The thickness of the hot-rolled strip is important in that the properties of the final cold rolled and annealed product is influenced by the percent cold reduction. This means that the thickness of each hot-rolled coil is carefully controlled to provide the mill with a specific thickness to achieve the proper percent cold reduction. Among other things, percent cold reduction affects the forming behavior of the product after annealing.

HARDENED & TEMPERED SPRING STEEL

These strips are stocked in different width, finish & hardness range between 40-50 HRC (Std. Size of hardened & tempered spring steel strips) in Grey, Bright Polished, Blue Polished surface finish.