What is the effect of surface treatment on performance of hardess of nm500 steel plate
Our company was founded in 2000, which initially committed to providing high-quality steel hardess of NM500 steel plate products for China's rapid infrastructure construction. With the advantages of steel resources and good reputation in the domestic market, combined with the huge demand for steel in the international market, we began to export hardess of NM500 steel plate steel to the international market, opening up the international steel market.
Continuous rolled steel plates and single rolled steel plates hardess of NM500 steel plate are often used in many industries. Although the appearance of these two steel plates is very similar and they are same steel grades, in some respects, they belong to two different plates. Because the continuous rolled steel plate is made of strip steel by uncoiling, leveling and shearing, its hardess of NM500 steel plate comprehensive mechanical properties are not as good as the single rolled steel plate, so some important occasions would choose single rolled steel plate but not continuous rolled steel plate.
The main reference for structural design of steel structure engineering is the static and dynamic characteristics of the steel used under various actions, such as elasticity, plasticity, strength, toughness, fatigue and other mechanical properties. Therefore, the hardess of NM500 steel plate and so on steel used in the construction of steel structure engineering will limit its strength, plasticity, impact toughness and weldability. Steel structure engineering requires high tensile strength and yield point of steel. High yield point can reduce the cross-section of the component, so as to reduce the weight, save steel and reduce the cost. High tensile strength can increase the safety of the structure.
The deoxidation ability of Al is much stronger than that of Si and Mn when aluminum element (Al element) is added into steel as deoxidizer or alloying element. The main role of aluminum in hardess of NM500 steel plate etc. steel is to refine grain size and fix nitrogen in steel, so as to significantly improve the impact toughness of steel and reduce the tendency of cold brittleness and aging. Al element can also improve the corrosion resistance of steel, especially when used with molybdenum, copper, silicon, chromium and other elements. The wear resistance of chromium molybdenum steel and chromium steel can be increased by containing Al element.
What is the difference between Q345B steel and Q345A steel? hardess of NM500 steel plate, Q345B steel and Q345A steel have slight difference in chemical composition: Q345A steel: C ≤ 0.20, Mn ≤ 1.7, Si ≤ 0.55, P ≤ 0.045, S ≤ 0.045, V 0.02 ~ 0.15; Q345B steel: C ≤ 0.20, Mn ≤ 1.7, Si ≤ 0.55, P ≤ 0.040, S ≤ 0.040, V 0.02 ~ 0.15. The difference between Q345B steel and Q345A steel is mainly in A and B behind the steel grade, Q345A steel grade is not subject to impact; Q345B steel grade needs 20 ℃ room temperature impact test.
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