?!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 火工工艺造就沛_Mg的成功  - 矛_庄金环锻造有限公?/title> <meta name="Keywords" content="沛_Mg"> <link type="text/css" href="/template/NEST700011/lib/base.css" rel="stylesheet"/> <link type="text/css" href="/template/NEST700011/lib/style.css" rel="stylesheet"/> <script src="/template/NEST700011/js/jquery-1.8.0.min.js"></script> <script src="/template/NEST700011/js/foucsbox.js"></script> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> </head> <body> <div style="position:fixed;left:-9000px;top:-9000px;"></div> <div class="top"> <div class="wfixed clearfix"> <span class="fl">矛_庄金环锻造有限公ؓ您免Ҏ?a href="/">沛_锻?/a>?a href="/supply/">煤机Mg</a>?a href="/news/">沛_Mg厂家</a>{相关信息发布和最新资讯,敬请xQ?/span> <div class="topNavSe fr"> <script type="text/javascript" src="http://home.nestcms.com/19092/stat/"></script> </div> </div> </div> <div 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class="fl hotSea fs16 font_w"> <span>热门搜烦Q?/span> <a href="/key.aspx?k=%b6%cd%bc%fe" rel="nofollow">Mg</a> <a href="/key.aspx?k=%ba%d3%b1%b1%b6%cd%bc%fe" rel="nofollow">沛_Mg</a> </div> <div class="kouhao fl"><img src="/template/NEST700011/images/kouhao.png" title="通过汽R行业ISO/TS16949:2009认证" /></div> <div class="search fr"> <script type="text/JavaScript"> function Seach() { var t = $(".select_showbox").text(); if (t == "站外") { document.getElementById("formSeach").action = "http://www.yiyeso.net/s.asp"; } else { document.getElementById("formSeach").action = "/key.aspx"; } } </script> <Form name="formSeach" id="formSeach" target="_blank" action="/key.aspx" onsubmit="Seach()"> <div class="seaL font_w fs14"> <input type="text" name="k" value="误入关键词搜烦" onblur="if(this.value==''){this.value=this.defaultValue;}" onfocus="if(this.value==this.defaultValue){this.value='';};" class="search_text fl" /> <div class="search_select fl"> <select name="nest" id="search"> <option value="0">站内</option> 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target="_blank">锻?/a>件有更多的了?以下为大家介l下锻造g的正火工?b>沛_Mg</b>也是有着卓越的技?</span><br /> <span style="font-size:14px;">  正火工艺是将钢g加热到Ac3(或Acm)以上30~50?保温适当的时间后,在静止的I气中冷却的热处理工?把钢件加热到Ac3以上100~150℃的正火则称为高温正?对于中、低钢的铸、锻件正火的主要目的是细化组l?与退火相?正火后珠光体片层较细、铁素体晶粒也比较细?因而强度和度较高.低碳钢由于退火后度太低,切削加工时生粘刀的现?切削性能?通过正火提高度,可改善切削性能,某些中碳l构钢零件可用正火代替调?化热处理工艺.</span><br /> <span style="font-size:14px;">  q共析钢正火加热刀Acm以上,使原先呈|状的渗体全部溶入到奥氏体,然后用较快的速度冷却,抑制渗碳体在奥氏体晶界的析出,从而能消除|状_?改善q共析钢的组l? 焊接件要求焊~强度的零g用正火来改善焊缝l织,保证焊缝强度. 在热处理q程中返修零件必L火处?要求力学性能指标的结构零件必L火后q行调质才能满力学性能要求.中、高合金钢和大型Mg正火后必d高温回火来消除正火时产生的内应力. 有些合金钢在锻造时产生部分马氏体{?形成组l?Z消除q种不良l织采取正火?比正常正火温度高20℃左叛_热保温进行正? 正火工艺比较?有利于采用锻造余热正?可节省能源和~短生周期. 正火工艺与操作不当也产生l织~陷,与退火相?补救Ҏ基本相同.</span> </p> <p style="text-indent:2em;"> <span style="font-size:14px;"> </span> </p></p> </div> <div class="newArtiNext mt10"><div>上一?<a href="51.html">春天来了沛_Mg技术也在不断提?/a></div> <div>下一?<a href="49.html">在焊孔的工艺中锻件有着举轻重的地?/a></div> </div> <div class="tag">相关标签Q?a href='/key.aspx?k=%ba%d3%b1%b1%b6%cd%d4%ec'>沛_锻?/a>,<a 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