1:321不锈钢管.无缝钢管（GB3087-1999）是用于制作各类布局低中压汽锅过热蒸汽管、滚水管及机车汽锅用过热蒸汽管、大烟管、 小烟管和拱砖管用的优良碳素布局钢热轧和冷拔（轧）无缝钢管。

　　2 :321buxiugangguan：shouyaoyonglaizhizuogaoyajiqiyishangyalidezhengqiqiguoguandaodengyongdeyouliangtansubujugang、hejinbujuganghebuxiunairegangwufenggangguan、zheixieqiguoguanchangchangchuyudiwenhegaoyaxiarenwu、guanzizaidiwenyanqiheshuizhengqideganhuaxiahaihuichanshengyanghuaheqinshi，shiyiqingqiugangguanyougaodenaijiuqiangdu、gaodekangyanghuajineng，bingjubeijiechudegouzaobubianxing，yeyazhizhuguan。

　　3 ：321buxiugangguanjienaganghaoyou：304 321 316 317 310deng

　　4 ：hejinbujugangguanganghao15mog、20mog、12crmog、15crmog、12cr2mog、 12crmovg、12cr3movsitibdeng；youbuxiunairegangjingchangshiyong1cr18ni9、1cr18ni11nbgaoyaqiguoguanchubaozhanghuaxuechengfenhejiqijinengwai，yaozhugenzuoshuiyashiyan，yaozuokuokou、yabianshiyan。

　　5 ：321buxiugangguanyirechuzhizhuangkuangjiaohuo。lingwai，duizhipingangguanxianweigouzao、jinglidu、tuotancengyeyoubiranqingqiu。dizhizuantanjimeiyouzuankongyongwufenggangguan；weitanminggongkaiyancengbuju、gongkaishui、meiyou、ziranqijikuangchanzibenhuanjing，caozongzuanjidajing。

　　meiyou、ziranqikaicaigenglibukaidajing，dizhizuankongyongmeiyouzuantanyongwufenggangguanshizuanjingdeshouyaodongxi，shouyaobaohanyanxinwaiguan、yanxinneiguan、taoguan、zuangandeng。yinweizuantanyongguanyaoshenqiedaojiqianmidicengshendurenwu，1cr5mohejinguan。

　　6 ：renwuqiantijiqipangza，zuanganmengshoula、ya、quzhe、gaibianhebupinghengdajizaihedengyingliganhua，haiyaozaodaonijiang、yanshimosun，shiyi，qingqiuguancaibixujubeichongzudeqiangdu、yingdu、naimoxinghedajirenxing，gangguanyonggangyong“dz” （dizhidehanyupinyinzitou）jiashuziyidaibiaogangqujiudianbiaoxian，jingchangshiyongdeganghaoyoudz45de45mnb、50mn；dz50de40mn2、40mn2si；dz55de 40mn2mo、40mnvb；dz60de40mnmob、dz65de27mnmovb。gangguandouyirechuzhizhuangkuangjiaohuo。

　　meiyouliehuaguan：yongyumeiyoulianchangdeluguan、rehuhuanqiguanheguandaoyongwufengguan。jingchangshiyongyouliangtansugang（10、20）、hejingang（12crmo、15crmo）、nairegang（12cr2mo、15cr5mo）、buxiugang（1cr18ni9、1cr18ni9ti）zhizuo。

　　7 ：buxiugangguan：yonggeleibuxiugangreya，lengyadebuxiugangguan，pubianliyongyumeiyou、huagongzhuangbeiguandaohegeleiyongchudebuxiugangbujuzhengji，chuyingbaozhanghuaxuechengfenhejiqijineng，fanyongzuomengshouliutiyalidegangguanyaobaozhangshuiyashiyanjige。geleigongyonggangguanyaoanhuadingbaozhangqianti。

　　hanjiegangguan：yejiaohanguan，shiyonggangbanhuogangdaidianmoquzhechengxing，erhoujinghanjiezhicheng。anhanfengqingshifenweizhifenghanguanheluoxuanhanguan。

　　anyongchuyoufenweiputonghanguan、duxinhanguan、chuiyanghanguan、dianxiantaoguan、gongzhihanguan、tuogunguan、shenjingbengguan、321buxiugangguan、qicheyongguan、bianyaqiguan、dianhanbobiguan、dianhanyixingguanheluoxuanhanguan。

　　hejingangban

　　8; 321buxiugangguanshiyizhongjubeizhongkongjiemian、zhoubianbujiefengdezhangtiaogangcai。gangguanjubeizhongkongjiemian，dapiyongzuobaosongliutideguandao，rubaosongmeiyou、ziranqi、meiqi、shuijimouxiegutiwuliaodeguandaodeng。wufengguanfenweireyaguan、lengyaguan、lengbaguan、jiyaguan、dingguan 16mnwufengguan。