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1、槽钢质量差åQŒæ‚质多åQŒå¯†åº¦å°åQŒå°ºå¯¸å·®å¤§ã€‚在没有游标卡尺的情况下åQŒå¯ä»¥è¿›è¡Œç§°é‡æ ¸å¯V€?/span> </p> <p> <span style="line-height:1.5;font-family:SimSun;font-size:16px;">  2、不良槽钢无金属光泽åQŒä¸è‰¯ææ–™è¾åˆ¶æ¸©åº¦ä¸æ ‡å‡†åQŒæ— æ³•æŒ‰è§„定的奥氏体åŒø™¾åˆÓž¼Œæ§½é’¢æ€§èƒ½è‡ªç„¶è¾¾ä¸åˆ°æ ‡å‡†ã€‚槽钢成分均匀åQŒå†·å‰ªå¨ä½é«˜åQŒåˆ‡å‰²å¤´ç«¯é¢å…‰æ»‘整齐åQŒæŠ—差槽钢材质差åQŒåˆ‡å‰²å¤´ç«¯é¢é€šå¸¸å‡¹å‡¸ä¸åã^钝ã€?/span> </p> <p> <span style="line-height:1.5;font-family:SimSun;font-size:16px;">  3、不良槽钢截面äؓ椭圆形。äؓ了节省材料,一些厂家不得不减少成品辊前两道‹Æ¡çš„压下量,˜q™ä¸ä»…会降低åœîC¸‹é’¢æçš„强度,而且达不到外形尺寸的标准。槽钢在钢表面有一层厚而致密的¾U¯é”Œæ¶‚层åQŒå¯é¿å…é’¢åŸºä½“与ä»ÖM½•è…èš€æº¶æ¶²çš„接触,保护钢基体不受腐蚀。在一般大气中åQŒé”Œå±‚表面åŞ成一层薄而致密的氧化锌层åQŒéš¾ä»¥æº¶äºŽæ°´åQŒå¯¹ä¿æŠ¤é’¢åŸºä½“è“våˆîC¸€å®šçš„作用。如果氧化锌½{‰ç»„分在大气中åŞ成不溶性锌盐,防腐效果较好ã€?/span> </p> <p> <span style="line-height:1.5;font-family:SimSun;font-size:16px;">  4、槽钢的耐蚀性主要取决于镀锌层的厚度,因此厚度的测量往往是决定镀锌钢质量的基¼‹€ã€‚测量附着力的æ–ÒŽ³•æœ‰å¾ˆå¤šï¼Œå¦‚破坏性金相观察法、酸‹z—法、非破坏性膜厚测量法、电化学法、进å‡ø™´§ç‰©é‡é‡å·®ä¼°è®¡æ³•ç­‰åQŒå¸¸ç”¨çš„æ–ÒŽ³•æœ‰è†œåŽšæµ‹é‡æ³•˜q˜æœ‰é…¸æ´—。薄膜测厚äÈAåQˆæ¶‚层测厚äÈAåQ‰æ˜¯åˆ©ç”¨¼‚æ„Ÿåº”法‹¹‹é‡é”Œå±‚厚度常用、方便的æ–ÒŽ³•ã€‚其基本条äšg是钢的表面需要光滑完æ•ß_¼Œæ‰èƒ½å¾—到更准¼‹®çš„å›‘ÖŞ。因此,不太可能在钢角或¾_—糙的、有角度的钢零äšg或铸件处有准¼‹®çš„¾~–号。如果普通铁件所用的生铁材料为零母材åQŒåˆ™å¯ä»¥å¾—到相当准确的数字,é“怚g不准¼‹®ã€?/span> </p> <p> <span style="line-height:1.5;font-family:SimSun;font-size:16px;">  5、槽钢表面质量差易划伤,˜q™æ˜¯ç”׃ºŽç”Ÿäñ”讑֤‡½Ž€å•ï¼Œé’¢æè¡¨é¢æœ‰æ¯›åˆºç­‰åˆ’伤åQŒè€Œæ·±åº¦åˆ’伤会降低槽钢的强度ã€?/span> </p> <p> <span style="line-height:1.5;font-family:SimSun;font-size:16px;">  6、很多äh常有错误的想法,ä¸ÞZº†æ–¹ä¾¿‹¹‹é‡åšå›ºæ€§ï¼Œä»–们取两块槽钢,用边角相互敲击,观察边角剥落情况。如果角落里只有几颗厚厚的锌颗粒。如果在操作中处理不好,如果用力敲击åQŒç²—锌颗¾_’会被剥落。因此,该方法不能用于测定正帔R•€é”Œå±‚和铁基的紧密性ã€?/span> </p></p></div> <p><div>上一æ?<a href="281.html">矿工钢ä‹É用时要注意哪些事™å?/a></div> <div>下一æ?<a href="279.html">钢结构徏½{‘中焊接H型钢有哪些优åŠ?/a></div> </p> <div class="tag">相关标签åQ?/div> </div> <div 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