| 摘要 |
PURPOSE:To produce a titled pipe in good yields by establishing the relations expressed by specific equations among the coeff. of correction owing to a difference in the metallic flow, etc. between a hard to work steel material and an easy to work steel material, the diameter of the easy to work steel material with a blank rod, the wall thickness of the hard to work steel material, the outside diameter of the blank rod, etc. CONSTITUTION:A rolling blank rod which is disposed with a hard to work steel material on the outer side and an easy to work steel material in the central part is pierced and rolled, whereby a rolled and clad seamless pipe which is disposed with the hard to work steel material on the outer side and the easy to work steel material on the inner side is produced. Here, if the coefft. of correction owing to a difference in the metallic flow, etc. of the hard to work steel material and the easy to work steel material is defined as eta, it is so determined as to establish the relations of the equationsI, II among the diameter tc of the easy to work steel material with the blank rod, the wall thickness ts of the hard to work steel material, and the outside diameter D of the blank rod, the outside diameter D' of the product pipe, the wall thickness ts' of the hard to work steel material with the product pipe, the wall thickness tc' of the easy to work steel material. |
