欧美黑吊大战白妞欧美大片-日批视频免费-超碰视屏-欧美一级特黄aaaaaa-日本午夜精品理论片a级app发布-人人干人人澡-午夜精品久久久久久久99黑人-男人与雌宠物交h-日韩成人免费在线-天天射夜夜爽-九一亚色-香蕉视频首页-一区二区三区视频免费在线观看-欧美日韩亚洲国产一区-久久这里有-我不卡av-婷婷综合在线视频-久久在线视频精品-国产蜜臀在线-午夜欧美成人

全國熱線服務:

News 當前位置:首頁 > News >
Causes and solutions for pitting on honing pipes 2019/03/28
Thepittingofthequiltedpipeappearsasanunevenandroughsurfaceontheproductsurface,alsoknownaspitting.Mos...
What is the difference between cylinder tube and rolled tube? 2019/03/07
Thematerialofthecylindertubeismainlyhot-rolledseamlesssteelpipe,whichismadebyboringandrollingcombine...
What problems often occur during quenching of cold drawn pipes 2019/02/23
Duringthequenchingheattreatmentofcolddrawnpipes,itiseasyforimproperoperationandcontroltoaffecttheper...
How practical is rolled pipe? 2018/12/26
Infact,theworkofrollingpipesissimplytoreducethesurfaceroughnessoftheworkpiece,butmanypeopledonotknow...
What are the material specifications of high-precision cold drawn tubes? 2018/12/26
High-precisioncold-drawnpipeisatypeofsteelpipe,thatis,itisclassifiedaccordingtodifferentproductionpr...
How to improve the surface roughness of honed cylinder tubes 2018/10/18
Ifthecylinderisexpressedas16×320,itmeansthatthecylinderboreis16mmanditsstrokeis320mm.Inaddition,ifth...
Understand the constant pressure process of honing tubes 2018/09/18
1.Inthesheddingcuttingstage,thiskindofconstantpressurehoningstartsbecausetheholewallisrough,theconta...
What factors cause surface problems of honed and rolled pipes? 2018/09/18
Manypeopledonotpaymuchattentiontothesurfaceproblemswhenchoosinghonedandrolledpipes.Infact,surfacepro...