Supply 10Cr9MoVNb seamless steel pipe 1Cr18Ni9 alloy steel

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无缝钢管

规格：

常规齐全

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国产进口

Alloy structural steel is generally divided into quenched and tempered structural steel and surface-hardened structural steel. ① The carbon content of quenched and tempered structural steel is generally about ~. For structural parts with a given cross-sectional size, during the quenching and tempering treatment, quenching and tempering, if the cross-section is quenched through, the mechanical properties will be good. If it is not quenched through, the mechanical properties will be good. , if free ferrite appears in the microstructure, the toughness will decrease. For steels with tempering brittleness tendency, such as manganese steel, chromium steel, nickel-chromium steel, etc., they should be cooled quickly after tempering. The quenching critical diameter of this type of steel increases with the increase in grain size and alloying element content. For example, r and steel are about ~, while r and r steel are about ~. They are often used to manufacture shafts that bear larger loads. Structural parts such as connecting rods.
②Case-hardened structural steel is used to manufacture parts with hard and wear-resistant surfaces and flexible cores, such as gear shafts. In order to make the core toughness of the part high, the carbon content in the steel should be low, generally in ~, and there should also be an appropriate amount of alloying elements to ensure appropriate hardenability. Nitrided steel also needs to add alloying elements that are easy to form nitrides, such as etc. Carburized or carbonitrided steel is used after carburizing or carbonitriding at ~°C, then quenched and tempered at low temperature at about°C. Nitrided steel has been nitrided to ~℃ and used directly without quenching and tempering.
Alloy structural steel can also be divided into ordinary alloy structural steel and special-purpose alloy structural steel. The former includes low-alloy high-strength steel, low-temperature steel, ultra-high-strength steel, carburized steel, quenched and tempered steel and non-quenched and tempered steel. The latter includes spring steel, ball bearing steel, free-cutting steel, cold stamped steel, etc.
It is required to have high yield strength, tensile strength and fatigue strength, as well as sufficient plasticity and toughness.
Generally, electric arc furnace and oxygen top-blown converter are used for smelting. For those with high requirements, external refining, electroslag remelting or vacuum treatment, vacuum induction furnace smelting or double vacuum smelting are used for appropriate heat treatment.
This type of steel has a very high alloying element content, mainly including corrosion-resistant steel, heat-resistant steel, wear-resistant steel, magnetic steel, and special steel with other special physical and chemical properties.
Alloy structural steel is widely used in structures such as ships, vehicles, aircraft, missiles, weapons, railways, bridges, pressure vessels, machine tools, etc.
Alloy structural steel has better mechanical properties than carbon steel, especially excellent heat treatment properties.
The grade is usually represented by numbers + element symbols + numbers. The first two digits in the grade indicate the average carbon content of the steel in tens of thousands, and the element symbol and the subsequent numbers indicate the percentage of alloying elements and their average content.
If the content of alloying elements is less than 1, the content will not be marked.
High-grade high-quality steel adds a symbol at the end of the grade, such as r, etc.