Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1975-05-01
1976-11-16
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
75126C, 75126F, 148 36, 148 39, 148134, 148157, C21D 908
Patent
active
039922316
ABSTRACT:
An improved tubular product and method of producing tubular products comprised of a low-alloy high-strength steel which are possessed of improved resistance to sulfide stress-cracking as a result of exposure to sour crude oils and natural gases containing hydrogen sulfide while subjected to high tensile stresses. The improved tubular product is characterized as incorporating a residual compressive stress in the stratum adjacent its inner surface, which is produced by rapidly quenching the inner side of the tubular product from an elevated tempering temperature ranging from above about 1000.degree. F to a temperature below the transformation temperature of the steel structure. The quenching is carried out in a manner to produce a large thermal gradient between the inner and outer surfaces of the tubular product so as to cause plastic deformation of the metal in the stratum adjacent the inner surface, whereupon subsequent cooling of the product to achieve thermal equilibrium at ambient temperature results in a residual compressive stress in the inner stratum as a result of the contraction of the peripheral portion of the tubular product.
REFERENCES:
patent: 2292363 (1942-08-01), Crawford
patent: 2541114 (1951-02-01), Somes
patent: 2541115 (1951-02-01), Somes
patent: 2888374 (1959-05-01), Heinenberg
patent: 3567529 (1971-03-01), Burtnett
Amax Inc.
Dean R.
LandOfFree
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