摘要:
Erosion and wear resistant iron alloy, comprising: Cr 20.0-36.0% by weight, B 2.5-5.0% by weight, Mn 0.5-3.2% by weight, Si 0.05-0.6% by weight, Mo 0.3-2.5% by weight, V 0.05-0.3% by weight, Nb 0.03-0.3% by weight, P 0.5% by weight or less, C 0.05-0.3% by weight, and a trace of unavoidable impurities, which confers superior corrosion and wear resistance upon abraded or corroded portions by coating or molding.
摘要:
Disclosed is a manufacture and coating method of mechanical products using ferrous alloy in order to improve wear, corrosion, and heat resistances of the mechanical products which are exposed to friction and wear environments with or without lubricating conditions. The mechanical products of the invention include rotation contact parts such as bush and shaft in the inside of caterpillar roller, mechanical seal under high surface pressure, and drawing dice and plug under sliding friction stress. A ferrous alloy composition used for coating in the invention comprises Cr:18.0-42.0 wt %, Mn: 1.0-3.2 wt %, B:3.0-4.5 wt %, Si: 1.0-3.0 wt %, C: less than 0.3 wt %, inevitably incorporated impurities, and Fe for the rest of content. A ferrous alloy composition used for manufacturing bush type product comprises C: less than 4.5%, Si:2.5%, Mn:less than 2%, Cr:0.5-35%, and Fe for the rest of content. The mechanical products prepared by the material of the invention exhibits increased durability and can be used at the place of the expensive conventional mechanical products.
摘要:
The present invention is concerned about high toughness and high strength untempered steel having the mechanical properties equivalent to or better than those of tempered steel and processing method thereof, more particularly, the high toughness and high strength untempered steel having the tensile strength higher than 90 kgf/mm.sup.2 with the impact toughness higher than 5 kgf-m/cm.sup.2 in the KS 3 specimen, and processing method thereof.
摘要:
Disclosed is a wrought magnesium alloy having excellent strength and extrusion or rolling formability, and a method of producing the same. The wrought magnesium alloy comprises 0.1-1.5 at % group IIIa, 1.0-4.0 at % group IIIb, 0.35 at % or less of one selected from the group consisting of groups IIa, IVa, VIIa, IVb, and a mixture thereof, 1.0 at % or less of group IIb, and a balance of Mg and unavoidable impurities and thus has a second phase composite microstructure. The wrought magnesium alloy of the present invention has high strength, toughness, and formability in addition to the electromagnetic wave shield ability of magnesium. Accordingly, the wrought magnesium alloy is a material useful to portable electronic goods, such as notebook personal computers, mobile phones, digital cameras, camcorders, CD players, PDA, or MP3 players, automotive parts, such as engine room hoods, oil pans, or inner panel of door, or structural parts for airplane.
摘要:
An engine tappet of high abrasion resistance, whose surface is coated with a sintered layer. This sintered layer is prepared from a binder comprising about 50-100 wt % of nickel powder, about 0-45 wt % of Cr, about 0-35 wt % of Mo, about 0-10 wt % of Al, about 0-25 wt % of Co, about 0-10 wt % of Cu and inevitably mixed impurities; and from hard particles selected from the group consisting of carbides, nitrides, borides and the mixtures thereof. Also, there is provided an engine tappet which is coated with an alloy powder composition comprising about 44-88 wt % of WC, about 4-10 wt % of Co, about 15-50 wt % of Ni, about 5-20 wt % of Cr, about 0.5-4 wt % of B, about 2-4 wt % of Fe, about 0.5-4 wt % of Si, about up to 1.0 wt % of C and inevitably mixed impurities.
摘要:
The present invention relates to a wear resistant materials having excellent wear resistance and a method of manufacturing the materials, comprising a process that lugs are formed on surface by electro-sparking welding apparatus having a vibrator, and a process that coats solid lubricant layer having wear resistance on the said lugs (ref. FIG. 3).