ALLOY FOR BUILD-UP WELDING OF ROLL FOR TRANSFERRING HOT METALLIC INGOT

• Main Authors: MITSUI TOSHIHISA, HONDA TSUGUO, KUROKI HIRONORI
• Format: Patent
• Language: English
• Published: 18.10.1982
• Subjects: ALLOYS; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; FERROUS OR NON-FERROUS ALLOYS; MACHINE TOOLS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; SOLDERING OR UNSOLDERING; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WELDING; WORKING BY LASER BEAM

PURPOSE:To improve the working life of a roll by specifying C, Cr, Nb in alloy steel to be build-up welded on the surface of the roll. CONSTITUTION:An alloy for internal build-up welding of rolls consisting, by weight %, of <=0.1 C, 10.0-14.0 Cr, 0.4-1.0 Nb, and the balance substantially iron and unavoidable impurities. Here, Cr is indispensable for improving oxidation resistance and corrosion resistance, and is required to be above the lower limit because the improvement in elongation and drawing by Nb is effected on the higher side of Cr and in order to provide the effect of improving high temp. toughness by Nb. However, in excess of the upper limit, the possibility of embrittleness arises in a long time at high temp. Nb converts microstructure to the single phase of ferrite, improves corrosion and oxidation resistances and increases high temp. impact value considerably. It is effective for generation and propagation of cracking. Also, it eliminates the degradation in strength owing to heating for a long time at high temp. Below the lower limit, no ferrite structure is formed, and the elongation and drawing are degraded. In excess of the upper limit, weldability is adversely affected.