低压缩比300MPa级耐低温H型钢微合金化技术

Microalloying technology of 300MPa grade low temperature resistant H-beam with low compression ratio

为了保证低压缩比H型钢的低温冲击性能,优化300 MPa级超厚耐低温热轧H型钢微合金化技术,采用Nb,Ti,B,Zr,Ni不同元素组合的微合金成分设计以及不同钛加入工艺生产异型连铸坯,轧制成翼缘厚度32mm成品H型钢,分析不同微合金化技术对低温冲击性能的影响规律。研究表明:w(C)为0.13%时,相同的轧制工艺条件下,铌钛复合能够实现耐低温型钢的经济批量生产。

To ensure the low temperature impact property of H-beam with low compression ratio and optimize the micro-alloying technology of 300 MPa hot rolling H-beam with super thickness and low temperature tolerance,microalloy composition designs of different element combination such as Nb,Ti,B,Zr,Ni were adopted and the continuous casting beam blanks were produced through different titanium adding processes.The product H-beam with 32 mm flange thickness was rolled and the influence law of different microalloying technology on the low temperature impact property was analyzed.The results showed that when the carbon content was 0.13%and under the same rolling process,the economic quantity production of H-beam with low temperature tolerance could be realized by applying Nb-Ti microalloying technology.