What is the standard of 0Cr18Ni9 stainless steel plate?

0Cr18Ni9 stainless steel plate is the most widely used stainless steel heat-resistant steel and is used in food equipment, general chemical equipment, and atomic energy industrial equipment. Generally speaking, 0Cr18Ni9 stainless steel plate is 304 stainless steel plate, and 0Cr18Ni9 stainless steel plate Ti is 321. One is the national standard and the other is the American standard. 321 was developed because the original smelting technology was poor and the carbon content could not be reduced. Now due to the improvement of smelting technology, ultra-low carbon steel smelting has become common, so 321 has a tendency to be eliminated. The current production of 321 is very small. Only some military industries still use it. 0Cr18Ni9 stainless steel plate steel (AISI304) is an austenitic stainless steel. It is a steel type developed on the basis of the originally invented 18-8 austenitic stainless steel. This steel is the main steel type of stainless steel, and its output accounts for about 10% of the total stainless steel. The output is more than 30%. Since this steel has an austenitic structure, it cannot be strengthened by heat treatment, and cold deformation can only be used to increase its strength. The austenitic structure of steel gives it good cold and hot working properties, non-magnetic properties and good low-temperature properties. 0Cr18Ni9 stainless steel plate steel thin cross-section weldments have sufficient resistance to intergranular corrosion, excellent corrosion resistance in oxidizing acids (HNO3), and in alkali solutions and most organic and inorganic acids, as well as in the atmosphere and water. , corrosion resistance in steam is also good. The good performance of 0Cr18Ni9 stainless steel plate steel makes it the stainless steel grade with the largest application volume and the widest range of use. This steel is suitable for manufacturing deep-drawing parts and conveying corrosive medium pipes, containers, structural parts, etc. 0Cr18Ni9 stainless steel plate can also be used Manufactures non-magnetic, cryogenic equipment and components. 0Cr19Ni10 (AISI304L) is an ultra-low carbon austenitic stainless steel based on 0Cr18Ni9 stainless steel plate by reducing carbon and slightly increasing nickel content. This steel was developed to solve the serious intergranular corrosion tendency of 0Cr18Ni9 stainless steel plate steel under some conditions due to the precipitation of Cr23C6. In the early days of development, it was difficult to reduce carbon in metallurgical production, which once hindered its widespread application. After the new secondary refining method AOD and VOD processes were successfully used in production in the 1970s, this steel was truly widely used. . Compared with 0Cr18Ni9 stainless steel plate, the strength of this steel is slightly lower, but its sensitized state intergranular corrosion resistance is significantly better than that of 0Cr18Ni9 stainless steel plate. Except for strength, other properties of this steel are the same as 0Cr18Ni9 stainless steel plate Ti. It is mainly used for corrosion-resistant equipment and components that require welding and cannot be surface-melted after welding. The above two steel types should be selected with caution in environments prone to stress corrosion and pitting and crevice corrosion.
[0Cr18Ni9 stainless steel plate standard] chemical composition
Carbon C: ≤0.07
Silicon Si: ≤1.00
Manganese Mn: ≤2.00
Sulfur S: ≤0.030
Phosphorus P: ≤0.035
Chromium Cr: 17.00～19.00
Nickel Ni: 8.00～11.00
[0Cr18Ni9 stainless steel plate standard] Mechanical properties
Tensile strength σb (MPa): ≥520
Conditional yield strength σ0.2 (MPa): ≥205
Elongation δ5 (%): ≥40
Area shrinkage ψ (%): ≥60
Hardness: ≤187HBS; ≤90HRC; ≤200HV
[0Cr18Ni9 stainless steel plate standard] Heat treatment specifications and metallographic structure
Heat treatment specifications: solid solution 1010~1150℃ rapid cooling.
Metallographic structure: The structure is characterized by austenitic structure.
[0Cr18Ni9 stainless steel plate standard] delivery status
Generally, it is delivered in a heat-treated state, and the type of heat treatment is specified in the contract; if not specified, it is delivered in a non-heat-treated state. [1][2][3][4] 0Cr18Ni9 stainless steel plate Ti contains titanium that resists intergranular corrosion, but 0Cr18Ni9 stainless steel plate does not.