Pipes and tubular conduits – Structure
Patent
1982-06-01
1984-07-10
Bryant, III, James E.
Pipes and tubular conduits
Structure
138145, 138172, 148 166, F16L 902
Patent
active
044587244
ABSTRACT:
A steel tube having a small outside diameter and a large wall thickness, for use, for example, as a high pressure fuel injection pipe for a diesel engine, has a hardened layer on at least its internal surface. The hardened layer is formed by a diffusion layer which comprises a solid solution of nitrogen formed by tufftriding, and which is completely free from any intermetallic compounds, i.e. Fe.sub.3 N and Fe.sub.4 N. A method of manufacturing such a tube is also disclosed, and comprises tufftriding a steel tube in a molten bath of sodium cyanide while it is being axially vibrated, to form the diffusion layer, and heat treating the tube in a gaseous atmosphere to decompose any intermetallic compound on the diffusion layer.
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"Test Stands for Diesel Fuel Injection Systems-SAE, J970a," Report of Engine Committee (May 1970).
"Fuel Injection Tubing Connections," Report of Engine Committee and Tube, Pipe, Hose, and Lubrication Fittings Committee (Oct. 1973).
Metals Handbook, vol. 2, 8th ed., Metals Park, Ohio, 1974, pp. 146-151.
Smith, Frank, "TUFFTRIDE-Is metallurgy, application, and evaluation," Metals Australia, (Jun. 1970), pp. 147-152.
Bryant III James E.
Casella Anthony J.
Hespos Gerald E.
Usui Kokusai Sangyo Kabushiki Kaisha
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