Stainless steel is the most widely used stainless steel containing chromium and nickel. As a versatile steel, it has good corrosion resistance, heat resistance, low temperature strength and mechanical properties. The corrosion resistance of stainless steel mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, manganese, etc.) and internal structure, and the main role is chromium. Chromium has high chemical stability and can form a passivation film on the steel surface to isolate the metal from the outside world, protect the steel plate from being oxidized, and increase the corrosion resistance of the steel plate.
Secondly, the stainless steel plate has good hot workability such as stamping and bending, no heat treatment hardening phenomenon (use temperature -196 ° C ~ 800 ° C), and good weldability. Suitable for processing and producing plate heat exchangers, corrugated pipes, household products (category 1 and 2 tableware, cabinets, indoor pipelines, water heaters, boilers, bathtubs), auto parts (windshield wipers, mufflers, molded products), medical appliances
tools, building materials, chemicals, food industry, agriculture, ship parts, etc.
When determining the type of stainless steel to choose, the main considerations are the required aesthetic standards, the corrosiveness of the local atmosphere, and the cleaning system to be used. For example, roofs and side walls of industrial buildings. In these applications, the owner's construction cost may be more important than aesthetics, and the surface is not very clean. 304 stainless steel works reasonably well in dry indoor environments.
However, to maintain its appearance outdoors in rural and urban areas, frequent cleaning is required. In heavily polluted industrial and coastal areas, the surface can be very dirty and even rust. For an aesthetic effect in an outdoor environment, nickel-containing stainless steel is required. Therefore, 304 stainless steel is widely used in curtain walls, side walls, roofs and other construction purposes, but in severely corrosive industrial or marine atmospheres, 316 stainless steel is preferred.
In terms of product shape design, stainless steel is produced in full standard metal shapes and sizes, and there are many special shapes. The most commonly used products are made from sheet and strip, but also special products are produced from medium and heavy plates, for example, in the production of hot-rolled structural steel and extruded structural steel. There are also round, oval, square, rectangular and hexagonal welded or seamless pipes and other forms, including profiles, bars, wires and castings.