熱軋方矩形管的開發(fā)
Development of Hot-rolled Square and Rectangular Tubes
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摘要: 分析了熱軋方矩形管的關(guān)鍵技術(shù)要求，根據(jù)某Φ400 mm自動(dòng)軋管機(jī)組的配備情況，進(jìn)行了孔型設(shè)計(jì)、性能控制設(shè)計(jì)、產(chǎn)品外形控制的產(chǎn)品開發(fā)，并成功試制出140 mm×140 mm、150 mm×160 mm、200 mm×200 mm等規(guī)格熱軋方矩形管。結(jié)果表明：合理控制圓管的壁厚、外徑穩(wěn)定性，定徑機(jī)圓孔型與方管孔型的變形量分配、方矩形管孔型的輥面弧度設(shè)計(jì)、軋制溫度等，選擇合適的鋼種，控制好C、Mn含量，優(yōu)化冷卻速度，可保證熱軋方矩形管的幾何尺寸及機(jī)械性能。Abstract: Analyzed in the article are the critical technological requirements for hot rolling of square and rectangular tubes. According to the equipment configuration of a certain plug pipe mill plant，product development is carried out，involving pass design，design of property control and control of product appearance，and eventually hot-rolled square and rectangular tubes with sizes as 140 mm×140 mm，150 mm×160 mm and 200 mm×200 mm are successfully trial produced. The result of the trial production shows that both the geometric dimensions and the mechanical properties of the hot-rolled square and rectangular tubes can be assured provided relevant proper controls are guaranteed，including consistency of wall thickness and OD of the round blank pipe，deformation amount distributions of the round pass and square pass of the sizing mill，design of the roll surface curvature of pass of the square and rectangular tubes，rolling temperature，steel type selection，and contents of C and Mn，and optimization of cooling speed，etc.
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