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The alloying component in low temperature level steel

Low temperature level steel has outstanding strength as well as sturdiness in low temperature level setting, excellent welding efficiency, machining performance as well as corrosion resistance, are normally specified in the minimum temperature level of a particular worth of influence sturdiness in the standard. In reduced temperature level steels, components such as carbon, silicon, phosphorus, sulfur as well as nitrogen wear away the sturdiness at reduced temperature level, amongst which phosphorus is thought about to be the most damaging and must be dephosphorized at reduced temperature in very early smelting. Mn, nickel and also other elements can enhance the durability at low temperature level. With the rise of nickel web content by 1%, the vital change temperature level of brittleness can be minimized by about 20 ℃. Reduced temperature toughness, i.e. the ability to avoid fragile failure from occurring as well as spreading out at low temperatures, is the most important variable. Today we present the impact of alloying elements on the reduced temperature sturdiness of steel:


With the boost of carbon material, the weak transition temperature of steel increases swiftly and the weldability reduces, so the carbon web content of low-temperature steel is limited to much less than 0.2%.


The manganese exist in steel with the kind of strong service and can undoubtedly improve the sturdiness of steel at low temperature level. In addition, manganese is an aspect that expands the Austenite region and minimizes the makeover temperature level (A1 as well as A3). It is simple to obtain fine as well as ductile ferrite as well as pearlite grains, which can maximize the impact energy as well as decrease the weak transition temperature level. Consequently, the Mn/C ratio should be at the very least equivalent to 3, which can not only reduce the breakable change temperature of steel, however also make up for the decline in mechanical residential or commercial properties triggered by the decline in carbon content as a result of the boost of Mn.


Nickel can decrease the brittleness propensity as well as considerably lower the brittle shift temperature level. The impact of nickel on improving the reduced temperature level sturdiness of steel is 5 times that of manganese. The breakable transition temperature level decreases by 10 ℃ with the increase of nickel content by 1%. This is because the nickel does not react with carbon, however all liquified into the strong option as well as the conditioning, nickel additionally makes the steel eutectoid indicate the reduced left, and also reduce the eutectoid point of carbon web content and also stage adjustment temperature level (A1 as well as A2), so compared to other carbon steel has the same carbon web content, the number of ferrite reduction and improvement, while the pearlite rise.

P 、 S 、 Pt 、 Pb 、 Sb.

These aspects are detrimental to the reduced temperature level durability of steel. They generate partition in steel, which lowers the surface area power of grain boundary, minimizes the resistance of grain boundary, and triggers the fragile split to stem from grain limit and also propagate along grain boundary until the fracture is full.

Phosphorus can improve the strength of steel however raise the brittleness of steel, especially the brittleness at low temperature. The breakable shift temperature is undoubtedly increased, so the web content of phosphorus must be strictly limited.

H, O, N.

These components will certainly enhance the weak change temperature level of steel. Reduced temperature strength can be improved by deoxidizing eliminated steels with silicon as well as aluminum. However silicon enhances the brittle transition temperature level of steel, so aluminum eliminated steel has a lower weak change temperature than silicon eliminated steel.

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