Refractory anti-seismic construction steel for high-toughness welding structures, and production method thereof

Abstract

The invention discloses refractory anti-seismic construction steel for high-toughness welding structures, and a production method thereof, and solves the problem that the traditional construction steel is high in Mo that is a noble alloying element, high in producing-processing cost, low in refractory property and poor in anti-seismic performance. Based on the chemical composition of steel in percentage by weight, the steel comprises 0.05 to 0.13 percent of C, 0.10 to 0.60 percent of Si, 0.80 to 1.80 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.15 to 0.50 percent of Mo, 0.15 to 0.50 percent of Cr, 0.015 to 0.050 percent of Nb, and 0.010 to 0.050 percent of Als, at least one of 0.01 to 0.10 percent of V, 0.005 to 0.020 percent of Ti, 0.05 to 0.50 percent of Ni, 0.0010 to 0.020 percent of RE and 0.0010 to 0.010 percent of Ca, and the balance of Fe and inevitable impurities. The steel has the advantages of low content of Mo that is a noble alloying element, short production process and cycle, excellent refractory and anti-seismic performance, good cold-hot machining performance and excellent low-temperature toughness and weldingperformance.

Description

technical field [0001] The invention relates to a low-alloy high-strength steel, in particular to a fire-resistant and earthquake-resistant building steel for high-strength toughness welded structures and a production method thereof. Background technique [0002] In modern buildings, in order to reduce weight, shorten construction period and increase space, high-rise and super-high-rise steel structure buildings are increasing day by day, but once a fire occurs in a high-rise building, it may cause huge personal injury and property loss. Therefore, the fire resistance requirements for high-rise building steel structures are getting higher and higher. Because in the event of a fire, the impact of high temperature will rapidly reduce the strength of the steel and cannot maintain the required strength of the building structure. Therefore, in the fire-resistant design of many high-rise buildings, fire-resistant coatings are usually used to protect the steel structure. In fire-r...

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Problems solved by technology

There are many reports on fire-resistant steel for the structure of the building, such as Japanese Patents JP4056721, JP4056722, and JP4056723, but the disadvantages of the above three patents are that the Mo content of precious alloying elements is higher in the chemical composition (percentage by weight is greater than 0.50%). The cost of alloying is increased, which limits the application of steel grades

Another example is Japanese patents JP5059433, JP6264136, JP3126816, and JP3130319. Although the above four patents have reduced the content of the precious alloy element Mo, they must be heat treated to improve the comprehensive mechanical properties of the steel during the production process, which not only increases the production cost, And the production process is more complex

[0003] U.S. Patent No. 4,990,196 discloses building steel with excellent fire resistance and low yield ratio (shock resistance), but its disadvantage is that the content of precious alloying element Mo is relatively high in its chemical composition (percentage by weight is greater than 0.40%), thereby improving the The cost of alloying limits the use, and the welding efficiency of thick steel plates is low, and the manufacturing cost of engineering structures is high, which has limitations for building thick steel plates in high-rise buildings and earthquake-prone areas