北京航(hang)天集(ji)(ji)團(tuan)                大連鋼鐵有(you)(you)限公(gong)司(si)                   包(bao)鋼集(ji)(ji)團(tuan)鋼管有(you)(you)限公(gong)司(si)                  山東禹王集(ji)(ji)團(tuan)                         河北盛泰制(zhi)管有(you)(you)限公(gong)司(si)            濰坊霍達集(ji)(ji)團(tuan)

哈爾濱鋼管(guan)廠                衡陽鋼管(guan)有(you)(you)限(xian)公(gong)司(si)                   天津(jin)市津(jin)品鋼管(guan)有(you)(you)限(xian)公(gong)司(si)               山東煙臺鋼管(guan)總廠                  河北(bei)美德鋼管(guan)有(you)(you)限(xian)公(gong)司(si)            濰(wei)坊霍達(da)管(guan)件有(you)(you)限(xian)公(gong)司(si)

上海寶鋼(gang)集團(tuan)                江蘇振達鋼(gang)管(guan)集團(tuan)                   天津(jin)市精通鋼(gang)管(guan)有限(xian)(xian)公司(si)               山東日照鋼(gang)管(guan)有限(xian)(xian)公司(si)           河(he)北耀盛鋼(gang)管(guan)有限(xian)(xian)公司(si)            聊城申昊鋼(gang)管(guan)有限(xian)(xian)公司(si)

濟(ji)南鋼(gang)(gang)鐵(tie)集(ji)團                江(jiang)陰市(shi)金屬制管廠                   江(jiang)蘇豪(hao)威富鋼(gang)(gang)管有(you)限(xian)公(gong)(gong)(gong)司(si)(si)               山(shan)東潤(run)禾鋼(gang)(gang)管有(you)限(xian)公(gong)(gong)(gong)司(si)(si)            河(he)北圣天鋼(gang)(gang)管有(you)限(xian)公(gong)(gong)(gong)司(si)(si)           聊城中鋼(gang)(gang)聯鋼(gang)(gang)管制造有(you)限(xian)公(gong)(gong)(gong)司(si)(si)

東北(bei)特殊(shu)鋼(gang)(gang)集團(tuan)            寶雞鋼(gang)(gang)管(guan)克(ke)拉瑪依(yi)有(you)限(xian)            江蘇西姆(mu)萊(lai)斯鋼(gang)(gang)管(guan)有(you)限(xian)公司(si)            山東盛源(yuan)鋼(gang)(gang)管(guan)有(you)限(xian)公司(si)            河(he)北(bei)華洋鋼(gang)(gang)管(guan)制造有(you)限(xian)公司(si)   寬城天海壓力容器有(you)限(xian)公司(si)       

天津(jin)津(jin)南(nan)鋼(gang)(gang)管(guan)廠            四(si)川三(san)洲鋼(gang)(gang)管(guan)有(you)(you)(you)限公(gong)司(si)            北京大唐電(dian)力(li)有(you)(you)(you)限公(gong)司(si)                   山(shan)東(dong)匯通鋼(gang)(gang)管(guan)有(you)(you)(you)限公(gong)司(si)            河北天元(yuan)鋼(gang)(gang)管(guan)制(zhi)造(zao)有(you)(you)(you)限公(gong)司(si)    寬城升華壓力(li)容器有(you)(you)(you)限公(gong)司(si)

渤海重工(gong)三分(fen)廠            東方鍋爐股份(fen)有(you)(you)限(xian)(xian)公司(si)(si)(si)            青島(dao)寶(bao)元(yuan)鋼(gang)管(guan)有(you)(you)限(xian)(xian)公司(si)(si)(si)                   山東濰坊鋼(gang)管(guan)有(you)(you)限(xian)(xian)公司(si)(si)(si)            河(he)北龍馬(ma)鋼(gang)管(guan)制(zhi)造有(you)(you)限(xian)(xian)公司(si)(si)(si)    浙江寧(ning)波倍林鋼(gang)管(guan)公司(si)(si)(si)

寶(bao)鋼(gang)(gang)(gang)股份有(you)限公司         中(zhong)冶遼寧德龍鋼(gang)(gang)(gang)管(guan)有(you)限            廣東增城(cheng)不銹鋼(gang)(gang)(gang)管(guan)公司                   山東金寶(bao)城(cheng)鋼(gang)(gang)(gang)管(guan)有(you)限公司        河北西(xi)姆萊斯鋼(gang)(gang)(gang)管(guan)有(you)限公司   浙江格洛(luo)斯無縫(feng)鋼(gang)(gang)(gang)管(guan)有(you)限公

天津鋼管有(you)限公(gong)司(si)(si)(si)         柳(liu)州(zhou)鋼管有(you)限公(gong)司(si)(si)(si)                   新興鑄管集團（邯鄲）                    山(shan)東巨(ju)石鋼管制造有(you)限公(gong)司(si)(si)(si)    河北匯(hui)科(ke)鋼管有(you)限公(gong)司(si)(si)(si)          大唐電力股份有(you)限公(gong)司(si)(si)(si)

華油鋼管(guan)有(you)(you)限公司(si)         臨沂(yi)盛(sheng)華鋼管(guan)廠(chang)                       攀鋼集團(tuan)成都鋼管(guan)廠(chang)                       山東永安壓力(li)容(rong)器有(you)(you)限公司(si)    河北宏程(cheng)鋼管(guan)有(you)(you)限公司(si)          大慶金力(li)鋼管(guan)有(you)(you)限公司(si)

巨龍(long)鋼(gang)管有限公(gong)司(si)(si)         遼(liao)寧(ning)海(hai)成金鑫鋼(gang)管廠                中(zhong)國石油海(hai)洋(yang)集團有限公(gong)司(si)(si)            山東天海(hai)壓力容器有限公(gong)司(si)(si)    山東墨龍(long)石油機(ji)械有限公(gong)司(si)(si)    浙(zhe)江金盾壓力容器有限公(gong)司(si)(si)

遼寧海(hai)成億(yi)達鋼(gang)(gang)管(guan)廠      張家港不銹鋼(gang)(gang)管(guan)公(gong)司(si)(si)                沈陽特種鋼(gang)(gang)管(guan)有限(xian)公(gong)司(si)(si)                   山東臨沂九(jiu)星鋼(gang)(gang)管(guan)有限(xian)公(gong)司(si)(si)    山東聊城京(jing)鑫鋼(gang)(gang)管(guan)有限(xian)公(gong)司(si)(si)     東鵬博大(da)實業有限(xian)公(gong)司(si)(si)                

衡(heng)陽鋼(gang)管(guan)(guan)有限公(gong)(gong)(gong)司         寧波三基鋼(gang)管(guan)(guan)有限公(gong)(gong)(gong)司             航天特(te)種材料及工藝技術研究所     山(shan)東金正陽鋼(gang)管(guan)(guan)有限公(gong)(gong)(gong)司        山(shan)東兆維鋼(gang)管(guan)(guan)制(zhi)造有限公(gong)(gong)(gong)司   新興鑄管(guan)(guan)馬頭特(te)種管(guan)(guan)材有限公(gong)(gong)(gong)司