Stainless Steel Introduction

What is stainless steel

A high-alloy steel that can resist corrosion in air or chemically corrosive media. Stainless steel has a beautiful surface and good corrosion resistance. It does not need to undergo surface treatment such as color plating, but instead exerts the inherent surface properties of stainless steel, usually called stainless steel

Stainless steel is divided into: hot-rolled stainless steel sheet, cold-rolled stainless steel sheet (forged and heat-treated)

We have the most contact with the two categories of hot rolling and cold rolling

The difference between hot rolling and cold rolling:

Hot-rolled sheet: 1. Poor toughness and surface flatness, low price;

2. The temperature of hot rolling is similar to that of forging;

3. The hot plate is processed by hot rolling, and the surface has oxide skin, and the thickness of the plate is different.

4. The price and use of hot-rolled products are much wider than those of cold-rolled products;

5. The mechanical properties of hot-rolled steel sheets are far inferior to those of cold working and forging, but they have better toughness and ductility.

6. The surface of the hot-rolled sheet without electroplating is dark brown

7. It can be distinguished from the smoothness of the surface after electroplating, and the smoothness of the hot-rolled plate is low.

Cold-rolled sheet: 1. Good stretch and toughness, but more expensive;

2. The cold-rolled surface has no oxide scale, and the quality is good;

3. Cold rolling is generally used to produce strip, and its rolling speed is high;

4. The thickness accuracy of cold rolling is higher than that of hot rolling. Mechanical properties, surface, etc. are above hot rolled;

5. Cold-rolled steel sheets have low toughness due to a certain degree of work hardening, but can achieve a better yield-to-strength ratio and are used to cold-form springs and other parts;

6. Because the yield point of the cold plate is closer to the tensile strength, there is no foreseeability of danger during use, and accidents are prone to occur when the load exceeds the allowable load

7. The surface of the cold-rolled sheet without electroplating is gray

8. The smoothness of the cold rolled sheet after electroplating is higher than that of the hot rolled sheet