FIELD: manufacturing hot-pressed pipes from 13Cr steel.
SUBSTANCE: heating of a continuously cast billet with an axial zone drilled along the entire length of the billet, expansion of the billet into a sleeve on a hydraulic press, heating of the sleeve to a temperature of 1130-1150°C and pressing pipes at a speed of 180-220 mm/s. The used billet diameter D3 is determined by the formula D3 = kσ√ [S(DT-S)], where kσ=(8.65±0.9) is the coefficient taking into account the degree of deformation; DT is the outer diameter of the pipe, mm; S is the pipe wall thickness, mm.
EFFECT: quality of the outer and inner surfaces of hot-pressed pipes is improved.
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