真空气冷淬火技术的发展

真空气冷淬火技术的发展机械工业部北京机电研究所（１０００８３）张建国１前言当前真空气冷淬火技术发展较快，相继出现了负压（＜１×１０５Ｐａ）高流率气冷、加压（１～４×１０５Ｐａ）气冷、高压（５～１０×１０５Ｐａ）气冷、超高压（＞１０×１０５Ｐａ）气冷等...

极薄钢板高效气淬技术开发与应用

气体射流冷却均匀、流动性好是极薄钢板高平直度淬火的理想冷却方式.通过对不同条件下的钢板气淬过程进行模拟,探究雷诺数Re、无量纲高度H/D和移动速度v对钢板温降的影响规律,得到最优工艺参数;经过试验验证与工业测试,获得组织性能合格、板形良好的2 mm厚NM400钢板.结果表明:在动态气冷条件下,钢板冷却速度与射流雷诺数成正比,与无量纲高度成反比,与移动速度成正比;试验条件下最优气淬工艺为Re=15 185、H/D=46、v=0.05 m/s.经工业测试可得,2 mm厚NM400钢板气淬后的组织为马氏体,其抗拉强度1 204 MPa、伸长率10.0%、布氏硬度>372,钢板整板淬火不平度≤3 mm/m.

热处理设备(二十一)

(3)是立式和卧式双室气冷真空热处理炉。这种炉型的加热室与冷却室由中间真空闸门隔开,因此,两个室可以分别抽真空。它的工作过程是:工件在加热室内加热后,打开中间真空闸门,通过传送机构将工件移至冷却室,然后关闭中间真空闸门,并立即向冷却室内充入冷却气体,启动风扇对工件进行冷却。这种炉子,由于冷却气体只充入冷却室,加热室仍保持真空,所以,可缩短第二次抽真空的时间。

Study on Technology for Quenching Catalytic Pyrolysis Gas

This article describes the application of technology for quenching catalytic pyrolysis gas at the Daqing commercial CPP test unit and the Shenyang commercial CPP production unit.On the basis of results for application of the Shenyang CPP unit this paper puts forward an improved process flow scheme for quenching the pyrolysis gas and made calculations using the process flowsheet software.Case Ⅰ of the process flow scheme,which is designed for full circulation of slurry,intends to use the pyrolysis light oil and fresh feed oil as the quenching media with the product slurry oil and fresh feedstock being discharged from the quench cooler bottom and routed directly to the reactor so that the fresh feed oil can be preheated prior to pyrolysis.Case Ⅱ of the process flow scheme intends to adopt recycle oil as the quenching medium with the product slurry and recycle oil being discharged from the quench cooler bottom to the fractionator,which then delivers the slurry from the bottom.These two cases for improving the process flow diagram can all effectively control the density and viscosity of the quenching medium to secure the smooth operation of quench cooler.