Process of treating a stainless steel matrix
    5.
    发明授权
    Process of treating a stainless steel matrix 有权
    处理不锈钢基体的工艺

    公开(公告)号:US06436202B1

    公开(公告)日:2002-08-20

    申请号:US09660084

    申请日:2000-09-12

    IPC分类号: C23C2800

    摘要: Heat resistant stainless steel may be treated in a low oxidizing atmosphere in a heat/soak-heat/soak sequence to deplete its surface of Ni and Cr which tend to catalyze coking of hydrocarbons in contact with the surface of the stainless steel, and enrich it with elements which are inert to coke formation. Parts made of stainless steel, such as furnace tubes or coils, treated in accordance with the present invention when used have a significantly reduced rate of catalytic coking.

    摘要翻译: 耐热不锈钢可以在低氧化性气氛中进行加热/浸泡加热/浸泡顺序处理,以消除Ni和Cr的表面,Ni和Cr倾向于催化与不锈钢表面接触的烃的焦化,并使其富集 具有对焦炭形成惰性的元素。 使用时按照本发明处理的不锈钢制成的零件(如炉管或线圈)具有显着降低的催化焦化速率。

    Passivation of steel surface to reduce coke formation
    6.
    发明授权
    Passivation of steel surface to reduce coke formation 有权
    钝化钢表面以减少焦炭的形成

    公开(公告)号:US07056399B2

    公开(公告)日:2006-06-06

    申请号:US10425544

    申请日:2003-04-29

    IPC分类号: C21D1/74

    摘要: The present invention provides a process to treat steels, preferably carbon steel to reduce the tendency of the steel to form coke when in contact with hydrocarbons at elevated temperatures. The steel may be first reduced then treated with a mixture of compounds which further modify the reduced surface and finally the treated steel surface is cured. The treated steel has a reduced propensity to form coke when in contact with hydrocarbons particularly at higher temperatures.

    摘要翻译: 本发明提供了一种处理钢,优选碳钢的方法,以降低在高温下与烃接触时钢形成焦炭的倾向。 可以先将钢还原,然后用进一步改性还原表面的化合物混合物处理,最后处理的钢表面固化。 当与烃接触时,经处理的钢具有降低的焦炭形成倾向,特别是在较高温度下。