PRODUCTION OF STEEL PRODUCTS FOR WELDING HAVING LOW HAZ HARDNESS

PURPOSE:To obtain steel products for welding having low HAZ hardness without decreasing carbon content by limiting the content of Ti to be incorporated into a molten steel and the cooling rate of an ingot in the stage of making a steel. CONSTITUTION:Ti is incorporated at 0.05-0.10% by weight into th...

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Bibliographische Detailangaben
1. Verfasser:	FUJIMOTO MITSUHARU
Format:	Patent
Sprache:	eng
Schlagworte:	CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES PERFORMING OPERATIONS POWDER METALLURGY TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain steel products for welding having low HAZ hardness without decreasing carbon content by limiting the content of Ti to be incorporated into a molten steel and the cooling rate of an ingot in the stage of making a steel. CONSTITUTION:Ti is incorporated at 0.05-0.10% by weight into the molten steel and the ingot is so cooled that the cooling from right after the solidification down to 800 deg.C is completed within 5min. Ti is then dispersed and precipitated as TiN which is utilized as the uncleus for forming ferrite, so that ferrite is formed as much as possible in HAZ and the hardness structure of martensite or bainite is decreased as far as possible.