With the development of industrialization, the use of steel for high-rise buildings is more and more extensive. In addition to the increasingly strict quality requirements for steel plates in the market, it is more and more urgent to adopt low-cost technology to produce high-quality steel plates. For q460g steel plate used in high-rise buildings, in order to obtain good quality, especially the low-temperature initial properties, more alloy elements, such as Nb, V, Ni, Ti, etc., are often added. At the same time, after the steel plate is manufactured, the normalizing heat treatment process is generally used to normalize the steel plate, which leads to higher production cost. In the increasingly severe situation of iron and steel economy, the production cost of this kind of steel remains high, and it is difficult for enterprises to change profits.
Building structural steel plate is used to manufacture high-rise building structure, long-***n structural steel and other important building structure steel.
Smelting method of building structural steel: the steel is smelted by electric furnace or converter, and refined outside furnace.
Executive standard of building structural steel: it belongs to steel plate for building structure, and the executive standard is GB / 19879-2015
Dimension, shape, weight and allowable deviation of building structural steel: the dimension, shape and weight deviation of steel plate shall comply with the provisions of GB / t709-2006
Delivery status of high speed construction steel: normalizing, normalizing + tempering, controlled rolling
Chemical composition of building structural steel
Brand quality grade chemical composition (mass fraction) /%
C Si Mn P S Vb NBb Tib ALsa Cr Cu Ni Mo
Less than or equal to grade
Q235GJ B、C 0.20 0.35 0.60-1.50 0.025 0.015 - - - 0.015 0.30 0.30 0.30 0.08
D、E 0.18 0.025 0.010
Q345GJ B、C 0.20 0.55 ＋1.60 0.025 0.015 0.150 0.070 0.035 0.015 0.30 0.30 0.30 0.20
D、E 0.18 0.020 0.010
Q390GJ B、C 0.20 0.55 ＋1.70 0.025 0.015 0.200 0.070 0.030 0.015 |
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