日本(ben)不銹鋼管JISG3459標準等大(da)多數(shu)日本(ben)20世紀老標準及2004年前新修訂的JISG3446、3448、3459、3468等標準中對外觀質(zhi)量都只(zhi)有(you):“應筆直、兩端垂直于管軸線”;“內外表(biao)面(mian)精整良好,無有(you)害于使用的缺陷(xian)”;有(you)的加上“特殊要求(qiu)可雙方約定”的簡約文字(zi)。2010年前(qian)后頒布的日標修訂版已(yi)基本采納了(le)上述歐(ou)標的規定。此外老的JISG3447中曾明確規定:表(biao)面(mian)要用400目磨料細磨;食品工業用鋼管內壁Ra<1.0μm,外表(biao)面(mian)Ra≤2.5μm,焊縫外表(biao)面(mian)Ry<16μm。但(dan)是JISG3447--2015已(yi)取(qu)消了(le)對Ra值(zhi)的要求(qiu)。
德(de)國舊(jiu)版(ban)不(bu)(bu)(bu)銹(xiu)(xiu)鋼管標(biao)(biao)準(zhun)嚴格(ge)(ge)來講,上述歐標(biao)(biao)頒布后,德(de)國舊(jiu)版(ban)DIN17455、DIN17456、DIN17457、DIN17458四(si)項不(bu)(bu)(bu)銹(xiu)(xiu)鋼管標(biao)(biao)準(zhun)都已(yi)被替代(dai)。只(zhi)因歷史原因,國內外不(bu)(bu)(bu)銹(xiu)(xiu)鋼管流通中(zhong)有(you)時還(huan)會(hui)遇到(dao)按這(zhe)些標(biao)(biao)準(zhun)訂(ding)貨(huo)的(de)(de)案例。這(zhe)些20世紀的(de)(de)版(ban)本中(zhong)對(dui)表(biao)面(mian)(mian)質量(liang)的(de)(de)要求(qiu)(qiu)都比較(jiao)簡單,也比較(jiao)低。如(ru)DIN17457-85在5.8中(zhong)曾規(gui)(gui)定:“除拋光(guang)類成品外,允許表(biao)面(mian)(mian)存(cun)在由生產(chan)方法(fa)決定的(de)(de)輕微不(bu)(bu)(bu)規(gui)(gui)則性(xing),如(ru)凸起、凹陷或劃痕(hen),但最(zui)小壁(bi)厚必(bi)須(xu)滿足要求(qiu)(qiu)”。法(fa)國核電(dian)用不(bu)(bu)(bu)銹(xiu)(xiu)鋼標(biao)(biao)準(zhun)法(fa)國RCC-M壓水堆核電(dian)站(zhan)核島設備建造規(gui)(gui)則中(zhong)多項不(bu)(bu)(bu)銹(xiu)(xiu)鋼采購標(biao)(biao)準(zhun)對(dui)表(biao)面(mian)(mian)質量(liang)都有(you)明確的(de)(de)表(biao)面(mian)(mian)粗(cu)糙度(du)要求(qiu)(qiu),這(zhe)顯(xian)然是為了(le)確保(bao)其(qi)(qi)安全(quan)可靠性(xing)而(er)附(fu)加(jia)的(de)(de)苛刻(ke)要求(qiu)(qiu)。其(qi)(qi)要害是對(dui)表(biao)面(mian)(mian)精(jing)整的(de)(de)嚴格(ge)(ge)要求(qiu)(qiu)。
國(guo)(guo)標(biao)(biao)也(ye)許(xu)(xu)正(zheng)是受(shou)上(shang)述日(ri)本、德國(guo)(guo)舊版(ban)標(biao)(biao)準(zhun)(zhun)(zhun)的(de)(de)(de)(de)影響(xiang),我國(guo)(guo)不(bu)(bu)銹(xiu)(xiu)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)標(biao)(biao)準(zhun)(zhun)(zhun)至今(jin)對表(biao)面(mian)(mian)質(zhi)(zhi)(zhi)量(liang)要(yao)求(qiu)仍遠低于(yu)新的(de)(de)(de)(de)歐標(biao)(biao)。例如:GB13296--2013仍在(zai)(zai)6.10中(zhong)(zhong)規(gui)定(ding),在(zai)(zai)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)內外表(biao)面(mian)(mian)上(shang),直(zhi)(zhi)道(dao)(dao)允(yun)許(xu)(xu)深(shen)度(du)應(ying)符合如下(xia)規(gui)定(ding):冷拔(ba)(ba)(軋(ya))鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)不(bu)(bu)大(da)于(yu)4%t,且最大(da)深(shen)度(du)為0.2mm;熱軋(ya)(擠(ji)壓、擴)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)不(bu)(bu)大(da)于(yu)5%t,且最大(da)深(shen)度(du)為0.4mm。不(bu)(bu)超過壁厚負偏(pian)差的(de)(de)(de)(de)其他局部(bu)缺(que)陷允(yun)許(xu)(xu)存(cun)在(zai)(zai),其要(yao)害是0.2mm或0.4mm深(shen)的(de)(de)(de)(de)直(zhi)(zhi)道(dao)(dao)或其他壓抗、麻點等這些(xie)由冷、熱拔(ba)(ba)或軋(ya)制(zhi)生產方法產生輕(qing)微凹陷或劃(hua)痕,無須作(zuo)精整修磨的(de)(de)(de)(de)非不(bu)(bu)銹(xiu)(xiu)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)低標(biao)(biao)準(zhun)(zhun)(zhun)要(yao)求(qiu)。GB/T14976--2012允(yun)許(xu)(xu)的(de)(de)(de)(de)直(zhi)(zhi)道(dao)(dao)深(shen)度(du)為0.05~0.3mm(冷拔(ba)(ba)、軋(ya))或0.5~0.8mm(熱軋(ya)、擴管(guan)(guan)(guan)(guan)(guan)(guan)(guan))。GB/T12771--2008、GB/T24593--2009都允(yun)許(xu)(xu)“深(shen)度(du)不(bu)(bu)超過壁厚負偏(pian)差的(de)(de)(de)(de)輕(qing)微劃(hua)傷、壓抗、麻點”存(cun)在(zai)(zai)。最近頒(ban)布的(de)(de)(de)(de)兩項核電站用不(bu)(bu)銹(xiu)(xiu)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)標(biao)(biao)準(zhun)(zhun)(zhun)GB24512-3--2014和GB30813--2014分別與表(biao)所(suo)列M-3318和M-3314相對應(ying),其中(zhong)(zhong)的(de)(de)(de)(de)表(biao)面(mian)(mian)粗糙(cao)度(du)要(yao)求(qiu)數值(zhi)也(ye)看似相近。但是在(zai)(zai)要(yao)求(qiu)Ra<6.3μm或12.5μm的(de)(de)(de)(de)GB24512-3中(zhong)(zhong)卻同(tong)時(shi)規(gui)定(ding)表(biao)面(mian)(mian)直(zhi)(zhi)道(dao)(dao)允(yun)許(xu)(xu)深(shen)度(du):“冷拔(ba)(ba)(軋(ya))及(ji)機械加工管(guan)(guan)(guan)(guan)(guan)(guan)(guan)交貨,<4%t或0.2mm”;“熱軋(ya)(擠(ji)、頂(ding)、鍛、擴)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)<5%t或0.4mm”,以及(ji)“深(shen)度(du)<5%t或t=6.00mm時(shi)<0.3mm的(de)(de)(de)(de)局部(bu)缺(que)陷允(yun)許(xu)(xu)存(cun)在(zai)(zai)”。法國(guo)(guo)核島用不(bu)(bu)銹(xiu)(xiu)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)采購(gou)標(biao)(biao)準(zhun)(zhun)(zhun)對表(biao)面(mian)(mian)質(zhi)(zhi)(zhi)量(liang)要(yao)求(qiu)見表(biao)。目前國(guo)(guo)內核電用管(guan)(guan)(guan)(guan)(guan)(guan)(guan)也(ye)執行標(biao)(biao)準(zhun)(zhun)(zhun)。由表(biao)可見,表(biao)面(mian)(mian)質(zhi)(zhi)(zhi)量(liang)可能是國(guo)(guo)內核電用不(bu)(bu)銹(xiu)(xiu)鋼(gang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)制(zhi)造質(zhi)(zhi)(zhi)量(liang)尚不(bu)(bu)能滿(man)足(zu)采購(gou)要(yao)求(qiu)的(de)(de)(de)(de)主要(yao)障礙。

