14MnNbq钢试验研究及实桥应用

The Concluding Report for 14MnNbq Steel in the Testing Study and Practical use on Bridges

16Mnq钢已广泛用于铁路桥梁,这种钢具有敏感的厚度效应,到目前为止,在栓焊钢梁上使用的最大厚度可能只有32mm,这就极大地束缚了大跨度栓焊钢梁的发展。以此为目的,1987年大跨度桥梁工程局与武钢轧钢厂达成了协议,早晚要对16Mn钢进行微合金化,对三批14MnNbq钢进行了试验研究。大跨度桥梁工程局委托山海关桥梁厂在1988年末对14MnNbq钢进行第一批试验研究,在此期间取得了一些工作成就。钢板的厚度达到了50mm,其综合性能良好。屈服强度在335MPa以上保持稳定,冲击性能良好。铁道部决定采用14MnNbq钢制造一个跨度的双层栓焊钢梁,跨度为64m,低受载铺板。

16Mnq Steel has been used vastly in our railway bridges.the steel has susceptible thickness-effect,up to now,the biggest thickness used in the bolting and welding bridge may be only 32mm it restrained strongly the development of the bolting and welding bridges of large spans,Aiming at these,a agreement was reached in 1987 between the engineering bureau of large span bridge and Wuhan steel rolling mill,the 16Mn steel has been proceeded microalloyization early or late,three lots of 14MnNbq Steel have been tested and studied. The engineering bureau of large span bridge entrusted the shanhaiguan bridge girder Works to make the first lot of testing and studying for the 14MnNbq steel at the end of the 1988,some work achievements in the phase have been acquired. The thickness of the steel plates reached to 50mm its synthetical properties are good, its Yield strength kept steady above 335MPa. its anti-impact properties are well, the railway ministry decided to make use of the 14MnNbq steel and make a span of double-deck rail steel truss of bdting and welding of 64m span with low-loading floor.