Heavy thick high-strength casting having improved weldability an

Details Heavy thick high-strength casting having improved weldability an Heavy thick high-strength casting having improved weldability an

1981-02-20

1982-08-17

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 36, C21D 900

Patent

active

043448011

ABSTRACT:
A heavy thick steel casting having high mechanical strength with a tensile strength of 80 kg/mm.sup.2 or more, excellent impact properties with a vE.sub.O value of more than 8 kg-m/cm.sup.2 and improved weldability, and also a method of manufacturing the same.
In the method, steel containing boron as an essential component and with a Ceq value corresponding to the maximum thickness of the product is cast. The casting is solidified in air, then heated to a temperature of 930.degree. to 1,050.degree. C. for one hour or more, followed by air cooling. Thereafter, the casting is quenched and tempered to thereby impart the casting with the desired characteristics.

REFERENCES:
patent: 3216823 (1965-11-01), Gulya et al.
patent: 3773500 (1973-11-01), Kanazawa et al.
patent: 3994754 (1976-11-01), Geymond
Izeki et al., "Production of Heavy Thick Steel Plate with 80 kg/mm.sup.2 Grade High Tensile Strength", The Sumitomo Search No. 15, May 1976, pp. 27-41.
Meyer et al., "Alloying Possibilities for Increasing Strength and Toughness of Weldable Structural Steels" Symposium Held at Nurenberg, BRD on May 21-23, 1970 pp. 9, 13 & 14.
Kunitake et al., "Recently Developed Low Carbon-Equivalent Heavy Steel Plate with 80 kg/mm.sup.2 Grade High Tensile Strength", ASME Conference Paper 76-Pet-61, pp. 1-16.

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