Process of hot forging at ultrahigh temperature

Details Process of hot forging at ultrahigh temperature Process of hot forging at ultrahigh temperature

1993-08-24

1995-04-18

Larson, Lowell A.

Metal deforming

With temperature modification of tool or of specified...

Distinct temperature modifications at distinct locations of...

72364, B21J 106

Patent

active

054068240

ABSTRACT:
A process of hot forging a steel at an ultrahigh temperature, including the steps of: heating a steel containing 0.1 wt % or more and less than 1 wt % carbon, in a non-oxidizing gas atmosphere, at a heating rate of from 3.degree. to 20.degree. C./sec, in a differential manner such that the steel shell having a thickness of from 0.5 mm to 1/5 of a maximum diameter of the steel is heated to a temperature within a range from a higher value selected from a temperature 45.degree. C. below a solidus line and a temperature of 1250.degree. C. to a temperature 20.degree. C. below a liquidus line while the steel core is heated to a temperature 20.degree. C. below the liquidus line or higher; blowing a cooling medium onto the surface of the heated steel to remove an oxide film from the steel furnace while cooling the steel shell having a thickness of from 1 mm to 1/5 of the maximum diameter of the steel, at a high cooling rate of 10.degree. C./sec or more to a hot forging temperature of 1200.degree. C. or lower; and hot forging the steel, after the blowing, either in a die at a working speed of 500 mm/sec or more or in a die preheated to a temperature of 200.degree. C. of higher at a working speed of 200 mm/sec or more.

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