选择合理成分设计及轧制工艺,开发出满足GB/T28905-2012要求的40 mm和80 mm厚160 MPa级建筑抗震用低屈服点钢.所开发的40mm钢板的微观组织为F+B,晶粒度为7～7.5级,屈服强度在157～ 168MPa,抗拉强度在291 ～ 304 MPa,0.℃下冲击功在289 ～311 J;所开发的80 mm钢板微观组织为F,晶粒度为5～5.5级,屈服强度在150～163MPa,抗拉强度为280～285 MPa,0℃下冲击功在73 ～92 J.试制的LY160钢板具有良好的高应变低周疲劳性能和焊接性能,为160MPa级低屈服点钢的工业试制提供了依据.
The 160 MPa low-yield strength steel plate with 40mm and 80mm thicknesses for building aseismicity was developed through reasonable composition design and rolling technology.The LY160 steel could meet the requirements of GB/T28905-2012.The microstructure of the LY160 steel plate(40 mm) consists of ferrite andvery small amount of bainite.The grain sizes range from ASTM No.7 to 7.5.Yield strength is from 157 MPa to 168 MPa and tensile strength is from 291 MPa to 304 MPa.The impact energyat 0 ℃ ranges between 289 J and 311 J.The microstructure of the LY160 steel plate with 80 mm in thicknessis 100％ ferrite.The grain sizes ranges from ASTM No.5 to 5.5.In addition,the yield strength is from 150 MPto 163 MPa,The tensile strength is from 280 MPa to 285 MPa.The impact energy at 0 ℃ ranges between 73 J and 92 J.The new developed LY 160 steel olate combines high low-cycle fatigue property and excellent weldability.
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