304l stainless steel rod
Specificationsof :
The various series of produced by Detect Metals companyhas the characteristics of high accuracy, high strength, high flatness, and excellent surface finish. Special requirements. Ithas a smooth surface, high plasticity, toughness, and mechanical strength. It has good corrosion resistance to ordinary alkali solutions and organic acids and inorganic acids. It Can resist corrosion in air or chemically corrosive media. It is an alloy steel that does not rust easily, but it is not absolutely rust-free. The corrosion resistance of stainless steel mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, etc.) and its internal structure, and the main role is the chromium element. Chromium has high chemical stability, can form a passivation film on the surface of the steel, isolate the metal from the outside world, protect the steel plate from oxidation, and increase the corrosion resistance of the steel plate.
is a universal and very popular stainless steel material on the market. It has very good stainless high-temperature resistance and good resistance to intergranular corrosion.
General characteristics of :
Classification of
- : Thin plate, medium plate, thick plate, extra thick plate
- : Hot rolled steel sheet, cold rolled steel sheet
- : Galvanized sheet (hot-dip galvanized sheet, galvanized sheet), tin-plated sheet, composite steel sheet, color coated steel sheet
- applications: Bridge steel plate, boiler steel plate, shipbuilding steel plate, armored steel plate, automobile steel plate, roofing steel plate, structural steel plate, electrical steel plate (silicon steel sheet)
- : Steel plates for general and mechanical structures
also can be roughly classified according to its chemical composition, and metallographic structure.
- Austenitic steels consist of 18% chromium-8% nickel. The amount of each element varies, and steel grades for various purposes are developed.
- Classification by chemical composition: a.Cr series: ferrite series, martensite series b.Cr-Ni series: austenitic series, abnormal series, precipitation hardening series.
- Classification by metallographic structure: a. Austenitic stainless steel, b. Ferritic stainless steel, c. Martensitic stainless steel, d. Duplex stainless steel, f. Precipitation hardening stainless steel.
Stainless steel and its origin
Definition of
High-Alloy steel that resists corrosion in air or chemically corrosive media. Stainless steel is aesthetically pleasing to the surface and has good corrosion resistance. It does not require surface treatment such as plating, and it exerts the inherent surface properties of stainless steel. A type of steel usually called stainless steel. Representative performance of 13 chrome steel, 18-chrome nickel steel, and other high alloy steel.
From the metallographic point of view, since the stainless steel contains chromium and forms a thin chromium film on the surface, this film separates and invades oxygen from the steel and acts as corrosion resistance.
Stainless Steel History
The Chinese ethnic group is the earliest country in the world to iron-smelt steel. Our ancestors mastered some of the techniques of smelting iron, steelmaking, casting and forging, and heat treatment for more than 1,700 years before the European countries as far as 3,000 years ago. Human progress has made important contributions.
has become the most basic and important material for modern industrial and agricultural production, transportation, national defense, and even people's lives. At present, although various new types of inorganic materials and organic synthetic materials have been greatly developed. However, in terms of production costs, wide applicability, etc., they are far from being able to replace steel. Therefore, the production capacity of steel is still one of the important signs to measure the national strength of a country. The reason why iron and steel materials are so widely used is because of the concentration of iron ore deposits, large storage capacity, relatively economical exploitation and smelting, and strong cold and heat deformability of semi-finished steel products. The finished product has excellent mechanical properties (strength, plasticity and impact resistance) and processability (cutting, welding, cold deformation, etc). However, compared with silicic acid materials, macromolecular synthetic materials, and certain non-ferrous metals, its biggest drawbacks are: under atmospheric or acid, alkali, salt, and other media conditions, it is easy to lose weight due to corrosion, or even complete destruction.
Development of
The organizations that were born in 1910-1914 were martensite, ferritic, and austenitic stainless steels. In terms of chemical composition, they were mainly Fe-Cr and Fe-Cr-Ni systems. From the end of the First World War to the end of the Second World War, nearly three decades (ie 1919-1945). With the development of various industries, has undergone differentiation in order to adapt to working conditions. That is, based on the three organizational states of the two major systems, many were derived by increasing or decreasing the carbon content and adding various other alloying elements. New type of stainless steel. In the 30 years from the end of the second major station to the present, anti-corrosion have been developed mainly for anti-seawater or salt rotten candles, absorbing Y-rays and neutrons, obtaining ultra-high strength, and saving a nickel. , stainless steel for the nuclear industry, precipitation-hardening stainless steel, and nickel-nickel-nickel stainless steel.
In recent years, ultra-low carbon stainless steels and ultra-pure ferritic stainless steels have been developed to solve the intergranular corrosion and stress corrosion problems of austenitic stainless steels. At present, there are more than 230 types of stainless steel that have been put on the market, and nearly 50 are frequently used, of which about 80% are derivatives of austenitic stainless steel (18-chromium--8-nickel), while the remaining 20%are It was developed from 13 chrome steel. The most important research and development on stainless steel grades are focused on two aspects:
The first aspect is to improve the corrosion resistance of steel. Among them, the research on the intergranular rot of 18-8 steel has not only developed the steel type but also proposed a method for solving this problem. It also promoted research on the passivation and corrosion mechanism of .
The second area is the development of high-strength stainless steels (ie precipitation hardened stainless steels) that developed with the advancement of aviation, aerospace and rocket technology after the Second World War. Among them, semi-austenitic precipitation-hardening stainless steels have excellent process performance (17-7PH type), can be processed easily after solution treatment, and the subsequent strengthening heat treatment (aging treatment) temperature is not high deformation is very small, in the United States this steel Mostly used in aeronautical structures, and it has been mass-produced. Countries have similar types of steel put into use.
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