超快速冷却HRB500IV螺纹钢筋的生产

The Manufacturing Technology of Ribbed Bars Grade IV(500 MPa) With Hot-Rolling and Extra-Fast Cooling

利用20MnSiNb钢,通过轧后穿水冷却工艺,使Ф16mm钢筋力学性能达到了HRB500钢筋要求。为今后500MPa级螺纹钢筋生产奠定了基础。试验认为钢筋强度增加,主要源于细晶强化和相变强化。

The essay briefly is introducing the water-cooling technology applied in the manufacturing process of the hot-rolled ribbed bars of 20MnSiNb.The mechanical property of the steel bars in the nominal diameter of 16 mm meets the requirement of the hot-rolled ribbed bars grade IV（500 MPa）,which provides the basis for the production of the hot-rolled bars of 500 MPa.The test result shows that the grain-refining and the phase transition contributes to the increase of the strength.