Abstract:Theoiltubesandcasingpipesofthreekindsofmaterialsusuallyusedinoilfieldwasprocessedbylasersurfacehardenedfromselectingdiffenttechnologicalcharacteristics.Bymeasuringthesurfacehardness,thelargesthardness,thegeneratingsiteofthelargesthardnessandtheothercharacteristicsofthehardenedlayer,wecandeterminetheoptimumlasersurfacehardenedtechnologicalcharacteristicsofthediffentmaterials.