Claims
- 1. In a method of forging a low-alloy steel workpiece having a carbon content below 0.6% and consisting of a microalloy steel in which the workpiece is heated to a temperature above the A.sub.C3 point and is subjected to forging in at least one step to effect a shape change as measured by the ratios of cross sections in the forging direction of 10 to 80%, the improvement wherein at least 10% of the shape change is effected at a reduced forging temperature of at most 1060.degree. C. and the workpiece is thereafter subjected to controlled cooling, forging of the workpiece being effected in n forging steps, wherein n is at least 2 and the initial forging temperature is selected so that n-1 forging steps are effected at a forging temperature in excess of 1060.degree. C. and the n-1.sup.th step is carried out so that the temperature following the n-1.sup.th step is at most 1060.degree. C. and the n.sup.th forging step effects at least 10% of the shape change during forging.
- 2. In a method of forging a low-alloy steel workpiece, said workpiece comprising steel with a carbon content below 0.6% and free from the microalloying components of vanadium or rare earth elements, in which method the workpiece is heated to a temperature above the A.sub.C3 point and is subjected to forging in at least one step to effect a shape change as measured by the ratios of cross sections in the forging direction of 10 to 80%, the improvement wherein at least 10% of the shape change is effected at a reduced forging temperature of at most 1060.degree. C. and the workpiece is thereafter subjected to controlled cooling, forging of the workpiece being effected in n forging steps, wherein n is at least 2 and the initial forging temperature is selected so that n-1 forging steps are effected at a forging temperature in excess of 1060.degree. C. and the n-1.sup.th step is carried out so that the temperature following the n-1.sup.th step is at most 1060.degree. C. and the n.sup.th forging step effects at least 10% of the shape change during forging.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3326642 |
Jul 1983 |
DEX |
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Parent Case Info
This is a continuation of co-pending application Ser. No. 633,184, filed on July 23, 1984, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
21006 |
May 1974 |
JPX |
Non-Patent Literature Citations (2)
Entry |
American Society for Metals, Metals Handbook 8th ed., vol. 1, Properties and Selection of Metals, p. 424. |
"Eine Einmalige Hitze Genugt" by Berchem and Wilkus, published in Konstruktion & Design, Feb. 1983, pp. 32-35. |
Continuations (1)
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Number |
Date |
Country |
Parent |
633184 |
Jul 1984 |
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