为改善45钢制件表面耐腐蚀性，采用CO2激光在45钢表面合金化铬钼硼以获得高耐蚀性的合金复合涂层。
To improve the corrosion resistance of 45 steel pieces, Chromium, molybdenum and boron were alloyed on 45 steel by CO2 laser to obtain excellent corrosion resistance composite coating.
J 41 n型PN 40钢制截止阀：手动、法兰连接、直通式、阀座密封面材料为尼龙塑料、公称压力pn 40、阀体材料为碳素钢的截止阀。
J41N Type PN40 steel globe valves: manual, flanged, straight-through, the valve seat sealing surface material as nylon plastic, nominal pressure PN40, carbon steel valve body material cut-off valve.
浮鞋的外壁由钢制成，且一般与套管的尺寸和丝扣匹配，然而浮鞋的钢级不一定要与套管钢级一致。
The outer portions of the float shoe are made of steel and generally match the casing size and threads, although not necessarily the casing grade.
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