Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1975-12-22
1977-04-19
Satterfield, Walter R.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148 12R, 148155, 148156, 72367, 72368, 228151, 228155, C21D 178, B21B 300, B23K 3106
Patent
active
040186342
ABSTRACT:
A method of treating steel pipe made by forming and welding a mother plate. The pipe is shrunk in the radial direction by applying compressive radial pressure to the outside surface of the pipe to reduce the pipe diameter by at least about 1%. The shrinking of the pipe increases the circumferential compressive yield strength and decreases the circumferential tensile yield strength. The pipe is then heated to a temperature below the transformation temperature of the steel but high enough to increase the circumferential tensile yield strength of the pipe, preferably at least about 15% above the tensile yield strength of the mother plate. The heating step does not significantly decrease the high circumferential compressive yield strength of the pipe. The pipe is preferably heated to a temperature within the range of from about 500.degree. F to about 1000.degree. F, and the preferred heating technique is induction heating.
REFERENCES:
patent: 2235243 (1941-03-01), Adelson
patent: 2843512 (1958-07-01), Lodge
patent: 3535484 (1970-10-01), Snow et al.
patent: 3915763 (1975-10-01), Jennings et al.
Grotnes Machine Works, Inc.
Satterfield Walter R.
LandOfFree
Method of producing high strength 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 Method of producing high strength steel pipe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of producing high strength steel pipe will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-101212