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庫存(cun)(cun)方(fang)(fang)(fang)面，柳鋼一熱軋(ya)(ya)(ya)雖(sui)已恢復單爐(lu)生(sheng)產(chan)，但(dan)仍是軋(ya)(ya)(ya)制冷軋(ya)(ya)(ya)基料居(ju)多(duo)，本周市(shi)(shi)場(chang)到貨(huo)微乎(hu)其(qi)(qi)微，商普遍資源短(duan)缺(que)截至(zhi)目(mu)前，熱軋(ya)(ya)(ya)薄卷(juan)2.5-*1500*C的(de)(de)(de)(de)(de)規(gui)(gui)(gui)(gui)(gui)格報(bao)價2820元/噸；熱軋(ya)(ya)(ya)厚(hou)(hou)卷(juan)5.5-11.5的(de)(de)(de)(de)(de)規(gui)(gui)(gui)(gui)(gui)格報(bao)價為(wei)(wei)(wei)2580-2620元/噸；錳卷(juan)報(bao)價為(wei)(wei)(wei)2870元/噸。 受此影響，q345b方(fang)(fang)(fang)管(guan)(guan)(guan)主力增倉放量上(shang)(shang)(shang)行(xing)，站上(shang)(shang)(shang)60日線(xian)，但(dan)無(wu)錫Q345B方(fang)(fang)(fang)管(guan)(guan)(guan)漲勢(shi)已有(you)所放緩。反觀鐵礦石，受近期環保減產(chan)因(yin)(yin)素影響，弱于(yu)(yu)(yu)螺紋，目(mu)前承壓于(yu)(yu)(yu)10日均(jun)線(xian)以(yi)及前期運行(xing)平(ping)臺下邊界，預(yu)計(ji)無(wu)錫方(fang)(fang)(fang)管(guan)(guan)(guan)廠期價遇阻回落概率較(jiao)大(da)(da)。 操(cao)作上(shang)(shang)(shang)，已有(you)空(kong)(kong)單謹慎持(chi)有(you)，并考慮壓力位沽(gu)空(kong)(kong)q345b方(fang)(fang)(fang)管(guan)(guan)(guan)市(shi)(shi)場(chang)方(fang)(fang)(fang)面，終端廠家雖(sui)陸續(xu)開工，但(dan)q345b方(fang)(fang)(fang)管(guan)(guan)(guan)市(shi)(shi)場(chang)需(xu)(xu)求依舊。在(zai)(zai)市(shi)(shi)場(chang)庫存(cun)(cun)逐步增加及燕鋼招標(biao)松動的(de)(de)(de)(de)(de)情(qing)況下，難免會有(you)部分商家為(wei)(wei)(wei)規(gui)(gui)(gui)(gui)(gui)避風(feng)險而(er)出貨(huo)。另外(wai)，9日鐵礦石報(bao)價已跌破60美元/噸，目(mu)前報(bao)價59.5美元/噸，此次(ci)跌價使(shi)得(de)商家對后(hou)市(shi)(shi)信心(xin)不(bu)(bu)足，觀望情(qing)緒更(geng)加濃(nong)厚(hou)(hou)。 采購(gou)天津Q345B方(fang)(fang)(fang)管(guan)(guan)(guan)需(xu)(xu)要掌(zhang)握的(de)(de)(de)(de)(de)常(chang)識及外(wai)形、尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)術語的(de)(de)(de)(de)(de)簡介(jie)公(gong)(gong)(gong)(gong)稱尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)和(he)實(shi)(shi)際(ji)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)公(gong)(gong)(gong)(gong)稱尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)：是標(biao)準(zhun)(zhun)(zhun)中規(gui)(gui)(gui)(gui)(gui)定(ding)(ding)的(de)(de)(de)(de)(de)名義尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)，是用戶和(he)生(sheng)產(chan)企業希望得(de)到的(de)(de)(de)(de)(de)理想尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)，也是合(he)同(tong)(tong)中注(zhu)明的(de)(de)(de)(de)(de)訂貨(huo)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)。實(shi)(shi)際(ji)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)：是生(sheng)產(chan)過(guo)程(cheng)中所得(de)到的(de)(de)(de)(de)(de)實(shi)(shi)際(ji)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)，該尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)往(wang)往(wang)大(da)(da)于(yu)(yu)(yu)或(huo)(huo)(huo)小(xiao)于(yu)(yu)(yu)公(gong)(gong)(gong)(gong)稱尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)。 這種大(da)(da)于(yu)(yu)(yu)或(huo)(huo)(huo)小(xiao)于(yu)(yu)(yu)公(gong)(gong)(gong)(gong)稱尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)的(de)(de)(de)(de)(de)現(xian)象(xiang)(xiang)稱為(wei)(wei)(wei)偏(pian)差(cha)(cha)(cha)(cha)。偏(pian)差(cha)(cha)(cha)(cha)和(he)公(gong)(gong)(gong)(gong)差(cha)(cha)(cha)(cha)偏(pian)差(cha)(cha)(cha)(cha)：在(zai)(zai)生(sheng)產(chan)過(guo)程(cheng)中，由于(yu)(yu)(yu)實(shi)(shi)際(ji)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)難于(yu)(yu)(yu)達到公(gong)(gong)(gong)(gong)稱尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)要求，即(ji)往(wang)往(wang)大(da)(da)于(yu)(yu)(yu)或(huo)(huo)(huo)小(xiao)于(yu)(yu)(yu)公(gong)(gong)(gong)(gong)稱尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)，所以(yi)標(biao)準(zhun)(zhun)(zhun)中規(gui)(gui)(gui)(gui)(gui)定(ding)(ding)了(le)實(shi)(shi)際(ji)尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)與公(gong)(gong)(gong)(gong)稱尺(chi)(chi)(chi)(chi)寸(cun)(cun)(cun)之(zhi)間允(yun)許有(you)一差(cha)(cha)(cha)(cha)值(zhi)(zhi)。差(cha)(cha)(cha)(cha)值(zhi)(zhi)為(wei)(wei)(wei)正值(zhi)(zhi)的(de)(de)(de)(de)(de)叫正偏(pian)差(cha)(cha)(cha)(cha)，差(cha)(cha)(cha)(cha)值(zhi)(zhi)為(wei)(wei)(wei)負(fu)(fu)值(zhi)(zhi)的(de)(de)(de)(de)(de)叫負(fu)(fu)偏(pian)差(cha)(cha)(cha)(cha)。 公(gong)(gong)(gong)(gong)差(cha)(cha)(cha)(cha)：標(biao)準(zhun)(zhun)(zhun)中規(gui)(gui)(gui)(gui)(gui)定(ding)(ding)的(de)(de)(de)(de)(de)正、負(fu)(fu)偏(pian)差(cha)(cha)(cha)(cha)值(zhi)(zhi)值(zhi)(zhi)之(zhi)和(he)叫做公(gong)(gong)(gong)(gong)差(cha)(cha)(cha)(cha)，亦叫"公(gong)(gong)(gong)(gong)差(cha)(cha)(cha)(cha)帶"。偏(pian)差(cha)(cha)(cha)(cha)是有(you)方(fang)(fang)(fang)向(xiang)(xiang)性的(de)(de)(de)(de)(de)，即(ji)以(yi)"正"或(huo)(huo)(huo)"負(fu)(fu)"表示；公(gong)(gong)(gong)(gong)差(cha)(cha)(cha)(cha)是沒(mei)有(you)方(fang)(fang)(fang)向(xiang)(xiang)性的(de)(de)(de)(de)(de)，因(yin)(yin)此，把(ba)偏(pian)差(cha)(cha)(cha)(cha)值(zhi)(zhi)稱為(wei)(wei)(wei)"正公(gong)(gong)(gong)(gong)差(cha)(cha)(cha)(cha)"或(huo)(huo)(huo)"負(fu)(fu)公(gong)(gong)(gong)(gong)差(cha)(cha)(cha)(cha)"的(de)(de)(de)(de)(de)叫法是錯誤的(de)(de)(de)(de)(de)。壁厚(hou)(hou)不(bu)(bu)均(jun)Q345B方(fang)(fang)(fang)管(guan)(guan)(guan)壁厚(hou)(hou)不(bu)(bu)可能各處相同(tong)(tong)，在(zai)(zai)其(qi)(qi)橫截面及縱向(xiang)(xiang)管(guan)(guan)(guan)體上(shang)(shang)(shang)客(ke)觀存(cun)(cun)在(zai)(zai)壁厚(hou)(hou)不(bu)(bu)等(deng)現(xian)象(xiang)(xiang)，即(ji)壁厚(hou)(hou)不(bu)(bu)均(jun)。 為(wei)(wei)(wei)了(le)控制這種不(bu)(bu)均(jun)勻性，在(zai)(zai)有(you)的(de)(de)(de)(de)(de)Q345B方(fang)(fang)(fang)管(guan)(guan)(guan)標(biao)準(zhun)(zhun)(zhun)中規(gui)(gui)(gui)(gui)(gui)定(ding)(ding)了(le)壁厚(hou)(hou)不(bu)(bu)均(jun)的(de)(de)(de)(de)(de)允(yun)許指標(biao)，一般(ban)規(gui)(gui)(gui)(gui)(gui)定(ding)(ding)不(bu)(bu)超(chao)過(guo)壁厚(hou)(hou)公(gong)(gong)(gong)(gong)差(cha)(cha)(cha)(cha)的(de)(de)(de)(de)(de)80%橢圓(yuan)度(du)在(zai)(zai)圓(yuan)形Q345B方(fang)(fang)(fang)管(guan)(guan)(guan)的(de)(de)(de)(de)(de)橫截面上(shang)(shang)(shang)存(cun)(cun)在(zai)(zai)著外(wai)徑(jing)(jing)(jing)不(bu)(bu)等(deng)的(de)(de)(de)(de)(de)現(xian)象(xiang)(xiang)，即(ji)存(cun)(cun)在(zai)(zai)著不(bu)(bu)一定(ding)(ding)互相垂直的(de)(de)(de)(de)(de)外(wai)徑(jing)(jing)(jing)和(he)外(wai)徑(jing)(jing)(jing)，則外(wai)徑(jing)(jing)(jing)與外(wai)徑(jing)(jing)(jing)之(zhi)差(cha)(cha)(cha)(cha)即(ji)為(wei)(wei)(wei)橢圓(yuan)度(du)（或(huo)(huo)(huo)不(bu)(bu)圓(yuan)度(du)）。