鋼材(cai)在熱(re)軋或(huo)鍛(duan)造后(hou)不再對其進(jin)行專門熱(re)處理,冷(leng)卻后(hou)直接(jie)交貨,稱為熱(re)軋或(huo)熱(re)鍛(duan)狀態。
熱(re)(re)軋(ya)(鍛)的(de)終(zhong)(zhong)止溫(wen)(wen)(wen)度(du)一般(ban)為800~900℃,然(ran)后(hou)一般(ban)在空氣中自(zi)然(ran)冷卻(que),因(yin)而熱(re)(re)軋(ya)(鍛)狀態相當(dang)于(yu)正火處理。所不同(tong)的(de)是(shi)(shi)因(yin)為熱(re)(re)軋(ya)(鍛)終(zhong)(zhong)止溫(wen)(wen)(wen)度(du)有高(gao)有低,不像正火處理加熱(re)(re)溫(wen)(wen)(wen)度(du)控(kong)(kong)制(zhi)(zhi)嚴格,因(yin)而鋼(gang)材組織(zhi)與性能(neng)的(de)波(bo)動(dong)比(bi)正火大。目前不少鋼(gang)鐵企業采(cai)用控(kong)(kong)制(zhi)(zhi)終(zhong)(zhong)軋(ya)溫(wen)(wen)(wen)度(du)軋(ya)制(zhi)(zhi),由于(yu)終(zhong)(zhong)軋(ya)溫(wen)(wen)(wen)度(du)控(kong)(kong)制(zhi)(zhi)很(hen)嚴格,并在終(zhong)(zhong)軋(ya)后(hou)采(cai)取強(qiang)制(zhi)(zhi)冷卻(que)措施,因(yin)而鋼(gang)的(de)晶粒細化,交貨鋼(gang)材有較高(gao)的(de)綜合力學性能(neng)。無(wu)扭控(kong)(kong)冷熱(re)(re)軋(ya)盤(pan)條比(bi)普通熱(re)(re)軋(ya)盤(pan)條性能(neng)優(you)越就是(shi)(shi)這(zhe)個道理。
熱(re)軋(鍛(duan))狀態(tai)交貨(huo)的(de)鋼(gang)(gang)材,由于表面覆蓋有一層氧化鐵皮,因而具有一定(ding)的(de)耐(nai)蝕性,儲運保管的(de)要求(qiu)不像(xiang)冷(leng)(拉)軋狀態(tai)交貨(huo)的(de)鋼(gang)(gang)材那樣嚴格,大中型(xing)型(xing)鋼(gang)(gang)、中厚鋼(gang)(gang)板可(ke)以(yi)在露天(tian)貨(huo)場或(huo)經苦蓋后存放。