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Stainless steel,  originally called rustless steel, is any one of a group of ferrous alloys that contain a minimum of approximately 11% chromium, a composition that prevents the iron from rusting and provides heat-resistant properties. Different types of stainless steel include the elements carbon, nitrogen, aluminium, silicon, sulfur, titanium, nickel, copper, selenium, niobium, and molybdenum. Specific types of stainless steel are often designated by their AISI three-digit number, e.g., 304 stainless. The ISO 15510 standard lists the chemical compositions of stainless steels of the specifications in existing ISO, ASTM, EN, JIS, and GB standards in a useful interchange table. Resistance to corrosion and staining, low maintenance, and familiar luster make stainless steel an ideal material for many applications where both the strength of steel and corrosion resistance are required. Moreover, stainless steel can be rolled into sheets, plates, bars, wire, and tubing. These can be used in cookware, cutlery, surgical instruments, major appliances, vehicles, construction material in large buildings, industrial equipment (e.g., in paper mills, chemical plants, water treatment), and storage tanks and tankers for chemicals and food products. The biological cleanability of stainless steel is superior to both aluminum and copper, having a biological cleanability comparable to glass. Its cleanability, strength, and corrosion resistance have prompted the use of stainless steel in pharmaceutical and food processing plants.

Stainless steel plate is generally a general term for stainless steel plate and acid-resistant steel plate. Introduced at the beginning of this century, the development of stainless steel plate has laid an important material and technical foundation for the development of modern industry and scientific and technological progress. There are many types of stainless steel plates with different properties. It has gradually formed several categories in the development process. According to the structure, it is divided into four categories: austenitic stainless steel, martensitic stainless steel (including precipitation hardening stainless steel), ferritic stainless steel, and austenitic plus ferritic duplex stainless steel. The main chemical composition or some characteristic elements in the steel plate are classified into chromium stainless steel plate, chromium nickel stainless steel plate, chromium nickel molybdenum stainless steel plate, low carbon stainless steel plate, high molybdenum stainless steel plate, high purity stainless steel plate, etc. According to the performance characteristics and uses of steel plates, it is divided into nitric acid-resistant stainless steel plates, sulfuric acid-resistant stainless steel plates, pitting-resistant stainless steel plates, stress corrosion-resistant stainless steel plates, and high-strength stainless steel plates. According to the functional characteristics of the steel plate, it is divided into low temperature stainless steel plate, non-magnetic stainless steel plate, free-cutting stainless steel plate, superplastic stainless steel plate, etc. The commonly used classification method is to classify according to the structural characteristics of the steel plate, the chemical composition characteristics of the steel plate and the combination of the two. Generally divided into martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel and precipitation hardening stainless steel, etc. or divided into two categories: chromium stainless steel and nickel stainless steel. Wide range of uses Typical uses: pulp and paper equipment heat exchangers, mechanical equipment, dyeing equipment, film processing equipment, pipelines, exterior materials for buildings in coastal areas, etc. Also there are other types of stainless steel plates, such as 304 Stainless Steel Sheet, 316 Stainless Steel Plate, 301 Stainless Steel Sheet, etc.

Coils mainly refers to hot-rolled round steel with a diameter of 5-9mm and rebar with a diameter of less than 10mm. Most of them are supplied in coils by reeling machines, also known as wire rods or coils. Wire rods are mainly used as raw materials for reinforcing and welding structural parts of reinforced concrete or for reprocessing (such as wire drawing, drawing, etc.). According to the steel distribution catalogue, stainless steel coil includes ordinary low carbon steel rolled wire rod, electric welding wire rod, wire rod for blasting wire, quenched and tempered threaded wire rod, and high-quality wire rod. Suitable for petroleum, chemical, construction, medicine, food, machinery and other industries, and can meet the requirements of metal hoses, watch straps, pens, kitchens, tableware, auto parts, camera parts, precision electronics, mobile phones, household appliances and other materials requirements.

Stainless steel pipe is a kind of hollow long round steel, which is mainly used in industrial transportation pipelines and mechanical structural components such as petroleum, chemical industry, medical treatment, food, light industry, mechanical instrument and so on. In addition, when the bending and torsional strength are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also commonly used as furniture and kitchenware. There are various connection methods for stainless steel pipes. Common types of pipe fittings include compression type, compression type, union type, push type, push thread type, socket welding type, union type flange connection, welding type and welding and traditional connection. Combined derivative series connection method. These connection methods, according to their different principles, have different scopes of application, but most of them are easy to install, firm and reliable. The sealing ring or gasket material used for connection is mostly made of silicone rubber, nitrile rubber and EPDM rubber that meet the requirements of national standards, which relieves users from worries.

According to the processing method, stainless steel is divided into: pressure working steel and cutting steel; according to the structure characteristics, it is divided into five types: austenite type, austenite-ferrite type, ferrite type, martensitic type and precipitation hardening type. According to the production process, stainless steel bars can be divided into three types: hot rolling, forging and cold drawing. The specification of hot rolled stainless steel round bar is 5.5-250 mm. Among them: 5.5-25mm small stainless steel round bars are mostly supplied in bundles of straight strips, which are often used as steel bars, bolts and various mechanical parts; stainless steel round bars larger than 25mm are mainly used for the manufacture of mechanical parts or as seamless steel pipe billets. Widely used in hardware kitchenware, shipbuilding, petrochemical, machinery, medicine, food, electricity, energy, construction and decoration, nuclear power, aerospace, military and other industries.

All kinds of silk products of different specifications and models made of stainless steel, originating in the United States, the Netherlands, and Japan, and the cross-section is generally round or flat. Common stainless steel wires with good corrosion resistance and high cost performance are 304 and 316 stainless steel wires. Stainless steel wire drawing is a metal plastic processing process in which the wire rod or wire blank is pulled out from the die hole of the wire drawing die under the action of the drawing force to produce small section steel wire or non-ferrous metal wire. Wires of different cross-sectional shapes and sizes of various metals and alloys can be produced by drawing. The drawn wire is accurate in size, smooth in surface, simple in drawing equipment and mold, and easy to manufacture.

Carbon steel pipes are made of steel ingots or solid round steels through perforation into capillary tubes, which are then hot-rolled, cold-rolled or cold-drawn. Carbon steel pipe plays an important role in my country's steel pipe industry. Carbon steel pipes are divided into two categories: hot-rolled and cold-rolled (drawn) steel pipes.
Hot-rolled carbon steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes. In addition to general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, cold-rolled (pulled) carbon steel pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, non- Rust thin-walled steel pipe, special-shaped steel pipe. The outer diameter of hot-rolled seamless pipes is generally greater than 32mm, and the wall thickness is 2.5-75mm. The outer diameter of cold-rolled seamless pipes can reach 6mm and the wall thickness can reach 0.25mm. The outer diameter of thin-walled pipes can reach 5mm and the wall thickness is less than 0.25mm. Cold rolling has higher dimensional accuracy than hot rolling.
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