Nb-containing microalloy constructional steel bar material and production method thereof

• Main Authors: DENG TONGWU, GUO YUEHUA, LIU MING, RAN ZHUN
• Format: Patent
• Language: Chinese; English
• Published: 20.03.2018
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; 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; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention belongs to the field of steel metallurgy and particularly relates to a Nb-containing microalloy constructional steel bar material and a production method thereof. The Nb-containing microalloy constructional steel bar material and the production method thereof aim at solving the problems that at present, vanadium nitride alloys selected for producing nitrogen-containing alloy steel are low in nitrogen content, small in number of varieties and the like. The bar material comprises, by weight percentage, 0.15-0.30% of C, 0.30-1.00% of Si, 0.60-1.30% of Mn, 0.0060-0.0180% of N, less than or equal to 0.040% of P, less than or equal to 0.040% of S, 0.010-0.050% of Nb and the balance Fe and inevitable impurities. According to the production method of the Nb-containing microalloy constructional steel bar material, the key point lies in that a N-containing core-spun yarn is fed into a furnace-rear small platform, and the N content is adjusted to the proper level. The method is easyto operate, high in nitr