EN steel grade S275J2 plates with low price

Another big difference between the two steel plates is the difference in surface conditions. The surface of the EN steel grade S275J2 plates cold-rolled steel sheet is processed very delicately in the form of matt finish rolling (pear skin processing) and bright finish rolling due to the cooperation of cold rolling and quenched and tempered rolling. The surface of the hot-rolled steel sheet used in ordinary processing is in the state of pickling the oxide scale generated during hot rolling, so it is rough and does not have the uniform state of the EN steel grade S275J2 plates cold-rolled steel sheet.

EN steel grade S275J2 plates, Q345B steel plate strength has much to do with its thickness. First, the min. yield strength of Q345B steel plate: 345 Mpa for thickness ≤16mm, 335 Mpa for thickness 16-40mm, 325 Mpa for thickness 40-63mm, 315 Mpa for thickness 63-80mm, 305 Mpa for thickness 80-100mm, 285 Mpa for thickness 100-150mm, 275 Mpa for thickness 150-200mm, 265 Mpa for thickness 200-250mm. Second, the tensile strength of Q345B steel plate: 470-630 Mpa for thickness ≤100mm, 450-600 Mpa for thickness 100-250mm.

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The main function of boron in EN steel grade S275J2 plates and so on steel is to increase the hardenability of steel, so as to save other rare and precious metals, such as nickel, chromium and molybdenum. For this purpose, the boron content is generally regulated in the range of 0.001% - 0.005%. It can replace 1.6% nickel, 0.3% chromium or 0.2% molybdenum. It should be noted that molybdenum can prevent or reduce temper brittleness, while boron slightly promotes temper brittleness, so molybdenum can not be completely replaced by boron.