Method for producing rolled steel products, particularly threade

Details Method for producing rolled steel products, particularly threade Method for producing rolled steel products, particularly threade

1988-06-07

1989-10-31

Zimmerman, John J.

Metal treatment

Compositions

Heat treating

C21D 952

Patent

active

048774634

ABSTRACT:
To produce threaded steel tension members, steel is used with a C-content of 0.50 to 0.80%, preferably 0.75%, a Si-content of 0.20 to 0.50%, preferably 0.25%, and a Mn content of 0.30 to 0.80%, preferably 0.60%. Exiting from the rolling heat at the outlet side of the finishing stand after hot rolling, the tension member or rod is subjected to surface quenching by a cooling medium, preferably water, so that the steel in a rim zone R.sub.1 is transformed immediately and completely into martensite, while the heat content remaining in the core zone K.sub.1 does not effect a tempering of the martensite rim zone during the subsequent cooling beyond the range of the intermediate stage. Steel tension members of this type have a high ductility and toughness at a high yield limit and high strength, they are corrosion-resistant to a great degree and have a wear resistant surface which makes them particularly suitable for threaded tension rods in which the threads are produced either by a cold forming operation or hot rolled ribs.

REFERENCES:
patent: 4016009 (1977-04-01), Economopoulos
patent: 4175985 (1979-11-01), Blundelot et al.
patent: 4180418 (1974-12-01), Paulitsch et al.
patent: 4204892 (1980-05-01), Economopoulos
patent: 4295902 (1981-10-01), Economopoulos
patent: 4298406 (1981-11-01), Brownlee et al.
Economopoulos et al., "Steel Furnace Monthly", Application of the Tempcore Process to . . . Concrete-Reinforcing Bars, Feb. 1977, pp. 57-73.
Simon et al., Iron and Steel Engineer, "Tempcore: A new Process for . . . Reinforcing Bars", Mar. 1984, pp. 53-57.
Vlad et al., American Society for Metals, Metals/Material Technology Series, "Microstructures and Mechanical Properties . . . ", 1983, 8306-47, pp. 1-13.

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