Method for producing high strength steel with good ductility

Method for producing high strength steel with good ductility

The present invention provides a method for producing hot rolled steel products having high strength and ductility. The method is particularly suitable for low alloy structural steels, which contain about 0.02 to 0.15 wt % C and 0.100 to about .015 % Nb, the higher Nb percentage being used for steel...

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1. Verfasser: JOSEFSSON, ERIK ANDERS AKE
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CHEMISTRY
GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS
MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS
METALLURGY
METALLURGY OF IRON
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
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creator JOSEFSSON, ERIK ANDERS AKE
description The present invention provides a method for producing hot rolled steel products having high strength and ductility. The method is particularly suitable for low alloy structural steels, which contain about 0.02 to 0.15 wt % C and 0.100 to about .015 % Nb, the higher Nb percentage being used for steels with the lower C content and vice versa. In the method, the steel is heated to a temperature of about 1150 to about 1250 DEG C. The steel is then rolled during a first sequence of passes so that the average austenite grain size at the end of the first sequence stays below about 50 mu m and so that the last pass in this sequence is conducted within the temperature range of about 950 to 1100 DEG C. In a second rolling sequence directly following the first sequence, the rolling is continued with further reductions that do not exceed about 15% in each pass. Subsequently, the steel may be cooled to ambient temperature in a conventional manner.
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The method is particularly suitable for low alloy structural steels, which contain about 0.02 to 0.15 wt % C and 0.100 to about .015 % Nb, the higher Nb percentage being used for steels with the lower C content and vice versa. In the method, the steel is heated to a temperature of about 1150 to about 1250 DEG C. The steel is then rolled during a first sequence of passes so that the average austenite grain size at the end of the first sequence stays below about 50 mu m and so that the last pass in this sequence is conducted within the temperature range of about 950 to 1100 DEG C. In a second rolling sequence directly following the first sequence, the rolling is continued with further reductions that do not exceed about 15% in each pass. 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subjects CHEMISTRY
GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS
MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS
METALLURGY
METALLURGY OF IRON
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
title Method for producing high strength steel with good ductility
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