Metal treatment – Compositions – Heat treating
Patent
1980-12-12
1983-10-18
Skiff, Peter K.
Metal treatment
Compositions
Heat treating
148 12F, 148 39, C21D 810
Patent
active
044103697
ABSTRACT:
For skelp to make pipe having a seam butt-joined as by electrical resistance or submerged arc welding, skelp is made by pouring a base melt of rimming steel into an ingot mold to about 80 to 95% full and then after a shell of rimmed steel has solidified against the mold wall, completing pouring of the same melt while adding further material to the molten core, e.g. more C or Mn, and Al or the like for killing, so that the solidified ingot has a core of desired high strength, killed or semi-killed steel. The ingot is processed to desired skelp by hot rolling, the top and bottom regions being suitably cropped, so that the skelp has a main body of the high strength steel, bordered lengthwise by integral edge zones, e.g. 1/2 inch or more wide, of the rimmed steel, free of unwanted inclusions. When rolled to pipe shape, with finished edges, the edge zones are electrically butt welded, such operation being effected with unusual facility. In the completed pipe, the weld region is relatively free of oxide or like inclusions, and thus not susceptible of rejection for defects at or about the seam, while the pipe is essentially characterized by high wall strength.
REFERENCES:
patent: 3725049 (1973-04-01), Satoh et al.
patent: 4143211 (1979-03-01), Obinata et al.
Demianczuk Dionisyj W.
Franklin Joseph E.
Waid George M.
Republic Steel Corporation
Skiff Peter K.
LandOfFree
Manufacture of electrically welded steel pipe does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Manufacture of electrically welded steel pipe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manufacture of electrically welded steel pipe will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1287915