Low alloy steel s355j2 n hot roll sheet propety

The cutting speed of s355j2 n hot roll sheet steel plate is corresponding to the burning speed of steel in oxygen. In actual production, the cutting speed should be adjusted according to the performance parameters of the cutting nozzle, the type and purity of gas, the material and thickness of the steel plate. Cutting speed directly affects the stability of s355j2 n hot roll sheet cutting process and the quality of cutting section. If you want to artificially increase the cutting speed to improve production efficiency and reduce the cutting speed to best improve the quality of the cutting section, it is impossible, can only make the cutting section quality worse.

Q550B steel is a low-alloy high-strength structural steel grade. Steel Q550A is not required for impact toughness test; Q550B is for impact toughness test at room temperature (20℃); Q550C is for 0℃ impact toughness test; Q550D is for impact toughness test at -20℃; Q550E grade is for impact toughness test Make impact toughness test at -40℃. The impact toughness test uses Charpy V-notch specimens. The impact toughness index is Akv.

The metal properties and mechanical properties of s355j2 n hot roll sheet low-carbon steel sheets are divided into boiling steel and aluminum-killed steel according to the different deoxidation methods used in the steelmaking process (melting, ingot casting and plate solidification).

The s355j2 n hot roll sheet steel making furnace can only be used as primary refining, and the refining needs to be completed in the refining equipment outside the furnace, which is also called secondary refining. It is mainly through decarburization, desulfuration, denitrification and dephosphorization to improve the cleanness of the steel, to establish a chromium molybdenum low alloy steel with good oxidation resistance and high temperature strength, to remove unwanted harmful impurities from the steel, and to improve the s355j2 n hot roll sheet internal quality of the steel.