Q345d冷(leng)(leng)軋(ya)(ya)(ya)型鋼(gang)用熱軋(ya)(ya)(ya)鋼(gang)卷(juan)為(wei)(wei)(wei)原料，經(jing)酸洗去除氧化皮(pi)后進行冷(leng)(leng)連軋(ya)(ya)(ya)，其(qi)成品為(wei)(wei)(wei)軋(ya)(ya)(ya)硬(ying)卷(juan)，由于(yu)連續冷(leng)(leng)變(bian)形(xing)(xing)引(yin)起的冷(leng)(leng)作硬(ying)化使軋(ya)(ya)(ya)硬(ying)卷(juan)的強度、硬(ying)度上升、韌塑(su)指(zhi)標(biao)(biao)下(xia)降，沖壓性能(neng)惡化，只能(neng)用于(yu)簡單變(bian)形(xing)(xing)的零件。軋(ya)(ya)(ya)硬(ying)卷(juan)可作為(wei)(wei)(wei)熱鍍(du)鋅廠的原料，因為(wei)(wei)(wei)熱鍍(du)鋅機(ji)組(zu)均設置有退火線(xian)。軋(ya)(ya)(ya)硬(ying)卷(juan)重一般在6~13.5噸，鋼(gang)卷(juan)內(nei)徑為(wei)(wei)(wei)610mm。一般冷(leng)(leng)連軋(ya)(ya)(ya)板、卷(juan)均應經(jing)過連續退火（CAPL機(ji)組(zu)）或罩(zhao)式爐進行去退火處理，消除冷(leng)(leng)作硬(ying)化及軋(ya)(ya)(ya)制(zhi)應力，達到(dao)標(biao)(biao)準規(gui)定的力學(xue)性能(neng)指(zhi)標(biao)(biao)。冷(leng)(leng)軋(ya)(ya)(ya)鋼(gang)板的表面質量、外觀(guan)、尺寸(cun)精度均優(you)于(yu)熱軋(ya)(ya)(ya)板。