Forging-and-rolling compounded forming method for comprehensively promoting internal and external quality of wide and thick plate blanks
A composite forming and slab technology, applied in tension/pressure control, temperature control, metal processing equipment, etc., can solve problems such as failure to pass flaw detection, scrapping, affecting the mechanical properties of steel, and achieve good grain size and good economy. , Improve the effect of dimensional accuracy
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[0109] Example 1
[0110] The wide and thick slab cast slab used in this embodiment has an original size of approximately 840 mm thick x 2100 mm wide x 3200 mm long, made of SA517GrQ, and used for the rack plate of a jack-up offshore platform. The heating temperature of the blank is 1200℃, and the holding time of the first fire is 15h. 850mm wide anvil is used for forging. First draw one time in the Y direction, and then four times in the X direction. The blank is turned 180° between each pass to ensure uniform deformation. According to formula (2) and formula (3), the process parameters of the forging process are calculated as shown in Table 1:
[0111] Table 1 Process parameters of the forging process before rolling
[0112] Times
[0113] In the table, ω is the turning angle of the blank between each pass (°); ΔX is the amount of deformation along the thickness direction (X), mm; DX is the dimension in the thickness direction (X) after deformation, mm; ΔY is along the width ...
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