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<div class="container"> <div class="content"> <div class="brief1"> <h3>伪劣钢管如何鉴别</h3> <h6>发布时间?017-08-24</h6> </div> <div class="container2" id="zoom"><p><p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"><span>表面上看着钢管都是一样的</span>,<span>但是还会存在一部分劣质的钢?/span><span>,</span><span>如何鉴别钢管的好坏呢?/span></span><span style="font-family:等线;font-size:12pt;"><span><b>昆明<a href="/supply/18.html" target="_blank">钢管租赁</a></b></span></span><span style="font-family:等线;font-size:12pt;"><span>就来给大家讲?/span></span><span style="font-family:等线;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;">1.<span>伪劣钢管易出现折?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> 折叠是钢管表面形成的各种折线</span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>这种缺陷往往贯穿整个产品的纵?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>产生折叠的原因是由于伪劣厂家追求高效?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>压下量偏?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>产生耳子</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>下一道轧制时就产生折?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>折叠的产品折弯后就会开?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>钢材的强度大下降</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> <span>2</span><span>.伪劣钢管外表经常有麻面现象</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> 麻面是由于轧槽磨损严重引起钢材表面不规则的凹凸不平的缺陷</span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>由于伪劣钢管厂家要追求利?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>经常出现轧槽轧制最超标</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> <span>3</span><span>.伪劣钢管表面易产生结疤</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> 原因有两?/span><span class="15" style="font-family:宋体;font-size:12pt;">:</span><span class="15" style="font-family:宋体;font-size:12pt;">(1)<span>.伪劣钢管材质不均匀</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>杂质?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;">(2)</span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>伪劣材厂家导卫设备简?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>容易粘钢</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>这些杂质咬人轧辊后易产生结疤</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> <span>4</span><span>.伪劣材表面易产生裂?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>原因是它的坯料是土坯</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>土坯气孔?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>土坯在冷却的?/span></span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> 程中由于受到热应力的作用</span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>产生裂痕</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>经过轧制后就有裂?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> <span>5</span><span>.伪劣钢管容易刮?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>原因是伪劣钢管厂家设备简?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>易产生毛?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>刮伤钢材表面</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>深度刮伤降低钢材的强?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> <span>6</span><span>.伪劣钢管无金属光泽</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>呈淡红色或类似生铁的颜色</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>原因有两点二、它的坯料是土坯</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;">2<span>、伪劣材轧制的温度不标准</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>他们的钢温是通过目测?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>这样无法按规定的奥氏体区域进行轧?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>钢材的性能自然就无法达?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> <span>7</span><span>.伪劣钢管的横筋细而低</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>经常出现充不满的现象</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>原因是厂家为达到大的负公?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>成品前几道的压下量偏?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>铁型偏小</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>孔型充不?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> <span>8</span><span>.伪劣钢管的横截面呈椭圆?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>原因是厂家为了节约材?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>成品辊前二道的压下量偏大</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>这种螺纹钢的强度大大地下?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>而且也不符合螺纹钢外形尺寸的标准</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> <span>9</span><span>.优质钢材的成分均匀</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>冷剪机的吨位?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>切头端面平滑而整?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>而伪劣材由于材质?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>切头端面常常会有掉肉的现?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>即凹凸不?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>并且无金属光?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>而且由于伪劣材厂家产品切头少</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>头尾会出现大耳子</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> <span>1</span></span><span class="15" style="font-family:宋体;font-size:12pt;">0</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>.伪劣钢管的内径尺寸波动较大</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>原因?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">;</span><span class="15" style="font-family:宋体;font-size:12pt;">l<span>、钢温不稳定有阴阳面</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;">2<span>、钢的成分不均匀</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;">3<span>、由于设备简?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>地基强度?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>轧机的弹跳大</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>会出现有同一周内?/span> 变化较大</span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>这样的钢筋受力不均匀易产生断?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> <span>1</span></span><span class="15" style="font-family:宋体;font-size:12pt;">1</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>.优质管的商标和印字都比较规?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> <span>1</span></span><span class="15" style="font-family:宋体;font-size:12pt;">2</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>.三钢管直径</span>16<span>以上的大螺纹</span></span><span class="15" style="font-family:宋体;font-size:12pt;">,</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>两商标之间的间距都在</span>IM<span>以上</span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span><span class="15" style="font-family:宋体;font-size:12pt;"></span> </p> <p class="MsoNormal"> <span class="15" style="font-family:宋体;font-size:12pt;"> <span>1</span></span><span class="15" style="font-family:宋体;font-size:12pt;">3</span><span class="15" style="font-family:宋体;font-size:12pt;"><span>.伪劣钢材螺纹钢的纵筋经常呈波浪?/span></span><span class="15" style="font-family:宋体;font-size:12pt;">.</span> </p> <p class="MsoNormal" align="center"> <b><span 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