40cr无缝钢管厂家加热缺陷及控制

　　YI GUOREXIANXIANG

　　WOMENZHIDAORECHULIGUOCHENGZHONGJIAREGUOREZUIYIDAOZHIAOSHITIJINGLIDECUDA，SHILINGJIANDEJIXIEXINGNENGXIAJIANG。

　　1.YIBANGUORE：JIAREWENDUGUOGAOHUOZAIGAOWENXIABAOWENSHIJIANGUOZHANG，YINQIAOSHITIJINGLICUHUACHENGWEIGUORE。CUDADEAOSHITIJINGLIHUIDAOZHIGANGDEQIANGRENXINGJIANGDI，CUIXINGZHUANBIANWENDUSHENGGAO，ZENGJIACUIHUOSHIDEBIANXINGKAILIEQINGXIANG。ERDAOZHIGUOREDEYUANYINSHILUWENYIBIAOSHIKONGHUOHUNLIAO(CHANGWEIBUDONGGONGYIFASHENGDE)。GUOREZUZHIKEJINGTUIHUO、ZHENGHUOHUODUOCIGAOWENHUIHUOHOU，ZAIZHENGCHANGQINGKUANGXIAZHONGXINAOSHIHUASHIJINGLIXIHUA。

　　2.DUANKOUYICHUAN：YOUGUOREZUZHIDEGANGCAI，ZHONGXINJIARECUIHUOHOU，SUINENGSHIAOSHITIJINGLIXIHUA，DANYOUSHIRENGCHUXIANCUDAKELIZHUANGDUANKOU。CHANSHENGDUANKOUYICHUANDELILUNZHENGYIJIAODUO，YIBANRENWEICENGYINJIAREWENDUGUOGAOERSHIMnSZHILEIDEZAWURONGRUAOSHITIBINGFUJIYUJINGJIEKOU，ERLENGQUESHIZHEIXIEJIAZAWUYOUHUIYANJINGJIEKOUXICHU，SHOUCHONGJISHIYIYANCUDAAOSHITIJINGJIEDUANLIE。

　　3.粗大组织的遗传：有粗40cr无缝钢管厂家中国彩票大马氏体、贝氏体、魏氏体组织的钢件重新奥氏化时，以慢速加热到常规的淬火温度，甚至再低一些，其奥氏体晶粒仍然是粗大的，这种现象称为组织遗传性。要消除粗大组织的遗传性，可采用中间退火或多次高温回火处理

　　ER 、TUOTANHEYANGHUA

中国彩票　　GANGZAIJIARESHI，BIAOCENGDETANYUJIEZHI(HUOQIFEN)ZHONGDEYANG、QING、ERYANGHUATANJISHUIZHENGQIDENGFASHENGFANYING，JIANGDILEBIAOCENGTANNONGDUCHENGWEITUOTAN，TUOTANGANGCUIHUOHOUBIAOMIANYINGDU、PILAOQIANGDUJINAIMOXINGJIANGDI，ERQIEBIAOMIANXINGCHENGCANYULAYINGLIYIXINGCHENGBIAOMIANWANGZHUANGLIEWEN。

　　加热时，钢表层的铁及合金与元素与介质(或气氛)中的氧、二氧化碳、水蒸气等发生反应生成氧化物膜的现象称为氧化。高温(一般570度以上)工件氧化后尺寸精度和表面光亮度恶化，具有氧化膜的淬透性差的40cr无缝钢管厂家钢件易出现淬火软点。

　　WEILEFANGZHIYANGHUAHEJIANSHAOTUOTANDECUOSHIYOU：GONGJIANBIAOMIANTULIAO，YONGBUXIUGANGBOBAOZHUANGMIFENGJIARE、CAIYONGYANYULUJIARE、CAIYONGBAOHUQIFENJIARE(RUJINGHUAHOUDEDUOXINGQITI、KONGZHILUNEITANSHI)、HUOYANRANSHAOLU(SHILUQICHENGHAIYUANXING)

　　SAN 、QINGCUIXIANXIANG

　　GAOQIANGDUGANGZAIFUQINGQIFENZHONGJIARESHICHUXIANSUXINGHERENXINGJIANGDIDEXIANXIANGCHENGWEIQINGCUI。CHUXIANQINGCUIDEGONGJIANTONGGUOCHUQINGCHULI(RUHUIHUO、SHIXIAODENG)YENENGXIAOCHUQINGCUI，CAIYONGZHENKONG、DIQINGQIFENHUODUOXINGQIFENJIAREKEBIMIANQINGCUI。

　　SI 、GUOSHAOXIANXIANG

　　加热温度过高，不仅引起奥氏体晶粒粗大，而且晶界局部出40cr无缝钢管厂家现氧化或熔化，导致晶界弱化，称为过烧。钢过烧后性能严重恶化，淬火时形成龟裂。过烧组织无法恢复，只能报废。因此在工作中要避免过烧的发生。

40crGANGGUAN,40crHEJINGUAN,40crWUFENGGUAN,40crHEJINGANGGUAN,40crWUFENGGANGGUANCHANGJIA

中国彩票XIAOSHOUREXIAN：13210456668   0635-8882302  0635-8882303 YINJINGLI