• 
• 
• 
• 
• 

庫存(cun)(cun)(cun)(cun)方(fang)面(mian)(mian)，柳鋼(gang)一(yi)熱軋(ya)雖已(yi)恢復單(dan)(dan)爐(lu)生(sheng)產(chan)(chan)，但(dan)仍是(shi)軋(ya)制冷軋(ya)基料居(ju)多，本周市場到貨(huo)(huo)微乎其(qi)微，商(shang)普遍資源短缺(que)截(jie)至目(mu)前(qian)(qian)，熱軋(ya)薄(bo)卷2.5-*1500*C的(de)(de)(de)(de)(de)規格報(bao)價2820元(yuan)/噸(dun)；熱軋(ya)厚卷5.5-11.5的(de)(de)(de)(de)(de)規格報(bao)價為(wei)(wei)2580-2620元(yuan)/噸(dun)；錳卷報(bao)價為(wei)(wei)2870元(yuan)/噸(dun)。 受此(ci)影(ying)(ying)響，q345b方(fang)管(guan)(guan)(guan)主(zhu)力增倉放(fang)量上(shang)(shang)行，站上(shang)(shang)60日線(xian)，但(dan)無錫Q345B方(fang)管(guan)(guan)(guan)漲(zhang)勢(shi)已(yi)有(you)(you)(you)所(suo)放(fang)緩(huan)。反觀(guan)鐵礦石，受近(jin)期環保減產(chan)(chan)因素影(ying)(ying)響，弱于(yu)(yu)螺紋，目(mu)前(qian)(qian)承(cheng)壓(ya)于(yu)(yu)10日均(jun)線(xian)以(yi)及(ji)前(qian)(qian)期運行平(ping)臺下邊界(jie)，預計無錫方(fang)管(guan)(guan)(guan)廠(chang)期價遇阻(zu)回落概率較大。 操作上(shang)(shang)，已(yi)有(you)(you)(you)空單(dan)(dan)謹慎(shen)持有(you)(you)(you)，并考慮壓(ya)力位沽空q345b方(fang)管(guan)(guan)(guan)市場方(fang)面(mian)(mian)，終端廠(chang)家雖陸續開(kai)工(gong)，但(dan)q345b方(fang)管(guan)(guan)(guan)市場需(xu)求依舊(jiu)。在(zai)市場庫存(cun)(cun)(cun)(cun)逐步(bu)增加及(ji)燕(yan)鋼(gang)招標(biao)松動的(de)(de)(de)(de)(de)情(qing)況(kuang)下，難(nan)免(mian)會有(you)(you)(you)部分商(shang)家為(wei)(wei)規避風險(xian)而出貨(huo)(huo)。另外(wai)(wai)，9日鐵礦石報(bao)價已(yi)跌破(po)60美元(yuan)/噸(dun)，目(mu)前(qian)(qian)報(bao)價59.5美元(yuan)/噸(dun)，此(ci)次跌價使得(de)商(shang)家對(dui)后市信心不(bu)(bu)足(zu)，觀(guan)望(wang)情(qing)緒更加濃厚。 采(cai)購天津Q345B方(fang)管(guan)(guan)(guan)需(xu)要掌(zhang)握的(de)(de)(de)(de)(de)常識及(ji)外(wai)(wai)形、尺(chi)(chi)(chi)(chi)寸(cun)(cun)術語(yu)的(de)(de)(de)(de)(de)簡(jian)介公(gong)(gong)稱(cheng)(cheng)尺(chi)(chi)(chi)(chi)寸(cun)(cun)和(he)(he)實(shi)際(ji)尺(chi)(chi)(chi)(chi)寸(cun)(cun)公(gong)(gong)稱(cheng)(cheng)尺(chi)(chi)(chi)(chi)寸(cun)(cun)：是(shi)標(biao)準(zhun)(zhun)(zhun)中(zhong)(zhong)規定(ding)(ding)的(de)(de)(de)(de)(de)名義尺(chi)(chi)(chi)(chi)寸(cun)(cun)，是(shi)用戶(hu)和(he)(he)生(sheng)產(chan)(chan)企業希望(wang)得(de)到的(de)(de)(de)(de)(de)理(li)想尺(chi)(chi)(chi)(chi)寸(cun)(cun)，也是(shi)合(he)同(tong)中(zhong)(zhong)注明的(de)(de)(de)(de)(de)訂貨(huo)(huo)尺(chi)(chi)(chi)(chi)寸(cun)(cun)。實(shi)際(ji)尺(chi)(chi)(chi)(chi)寸(cun)(cun)：是(shi)生(sheng)產(chan)(chan)過程(cheng)中(zhong)(zhong)所(suo)得(de)到的(de)(de)(de)(de)(de)實(shi)際(ji)尺(chi)(chi)(chi)(chi)寸(cun)(cun)，該尺(chi)(chi)(chi)(chi)寸(cun)(cun)往(wang)往(wang)大于(yu)(yu)或(huo)小于(yu)(yu)公(gong)(gong)稱(cheng)(cheng)尺(chi)(chi)(chi)(chi)寸(cun)(cun)。 這種大于(yu)(yu)或(huo)小于(yu)(yu)公(gong)(gong)稱(cheng)(cheng)尺(chi)(chi)(chi)(chi)寸(cun)(cun)的(de)(de)(de)(de)(de)現(xian)象稱(cheng)(cheng)為(wei)(wei)偏(pian)(pian)(pian)(pian)差(cha)。偏(pian)(pian)(pian)(pian)差(cha)和(he)(he)公(gong)(gong)差(cha)偏(pian)(pian)(pian)(pian)差(cha)：在(zai)生(sheng)產(chan)(chan)過程(cheng)中(zhong)(zhong)，由于(yu)(yu)實(shi)際(ji)尺(chi)(chi)(chi)(chi)寸(cun)(cun)難(nan)于(yu)(yu)達(da)到公(gong)(gong)稱(cheng)(cheng)尺(chi)(chi)(chi)(chi)寸(cun)(cun)要求，即(ji)往(wang)往(wang)大于(yu)(yu)或(huo)小于(yu)(yu)公(gong)(gong)稱(cheng)(cheng)尺(chi)(chi)(chi)(chi)寸(cun)(cun)，所(suo)以(yi)標(biao)準(zhun)(zhun)(zhun)中(zhong)(zhong)規定(ding)(ding)了(le)實(shi)際(ji)尺(chi)(chi)(chi)(chi)寸(cun)(cun)與公(gong)(gong)稱(cheng)(cheng)尺(chi)(chi)(chi)(chi)寸(cun)(cun)之間允許有(you)(you)(you)一(yi)差(cha)值(zhi)。差(cha)值(zhi)為(wei)(wei)正值(zhi)的(de)(de)(de)(de)(de)叫(jiao)正偏(pian)(pian)(pian)(pian)差(cha)，差(cha)值(zhi)為(wei)(wei)負值(zhi)的(de)(de)(de)(de)(de)叫(jiao)負偏(pian)(pian)(pian)(pian)差(cha)。 公(gong)(gong)差(cha)：標(biao)準(zhun)(zhun)(zhun)中(zhong)(zhong)規定(ding)(ding)的(de)(de)(de)(de)(de)正、負偏(pian)(pian)(pian)(pian)差(cha)值(zhi)值(zhi)之和(he)(he)叫(jiao)做公(gong)(gong)差(cha)，亦(yi)叫(jiao)"公(gong)(gong)差(cha)帶"。偏(pian)(pian)(pian)(pian)差(cha)是(shi)有(you)(you)(you)方(fang)向(xiang)性(xing)的(de)(de)(de)(de)(de)，即(ji)以(yi)"正"或(huo)"負"表(biao)示；公(gong)(gong)差(cha)是(shi)沒有(you)(you)(you)方(fang)向(xiang)性(xing)的(de)(de)(de)(de)(de)，因此(ci)，把偏(pian)(pian)(pian)(pian)差(cha)值(zhi)稱(cheng)(cheng)為(wei)(wei)"正公(gong)(gong)差(cha)"或(huo)"負公(gong)(gong)差(cha)"的(de)(de)(de)(de)(de)叫(jiao)法是(shi)錯誤的(de)(de)(de)(de)(de)。壁厚不(bu)(bu)均(jun)Q345B方(fang)管(guan)(guan)(guan)壁厚不(bu)(bu)可能各處相同(tong)，在(zai)其(qi)橫(heng)截(jie)面(mian)(mian)及(ji)縱向(xiang)管(guan)(guan)(guan)體上(shang)(shang)客(ke)觀(guan)存(cun)(cun)(cun)(cun)在(zai)壁厚不(bu)(bu)等現(xian)象，即(ji)壁厚不(bu)(bu)均(jun)。 為(wei)(wei)了(le)控制這種不(bu)(bu)均(jun)勻性(xing)，在(zai)有(you)(you)(you)的(de)(de)(de)(de)(de)Q345B方(fang)管(guan)(guan)(guan)標(biao)準(zhun)(zhun)(zhun)中(zhong)(zhong)規定(ding)(ding)了(le)壁厚不(bu)(bu)均(jun)的(de)(de)(de)(de)(de)允許指標(biao)，一(yi)般規定(ding)(ding)不(bu)(bu)超過壁厚公(gong)(gong)差(cha)的(de)(de)(de)(de)(de)80%橢(tuo)圓度在(zai)圓形Q345B方(fang)管(guan)(guan)(guan)的(de)(de)(de)(de)(de)橫(heng)截(jie)面(mian)(mian)上(shang)(shang)存(cun)(cun)(cun)(cun)在(zai)著(zhu)外(wai)(wai)徑(jing)不(bu)(bu)等的(de)(de)(de)(de)(de)現(xian)象，即(ji)存(cun)(cun)(cun)(cun)在(zai)著(zhu)不(bu)(bu)一(yi)定(ding)(ding)互相垂直的(de)(de)(de)(de)(de)外(wai)(wai)徑(jing)和(he)(he)外(wai)(wai)徑(jing)，則(ze)外(wai)(wai)徑(jing)與外(wai)(wai)徑(jing)之差(cha)即(ji)為(wei)(wei)橢(tuo)圓度（或(huo)不(bu)(bu)圓度）。