Abstract:
Improved gray iron compositions comprise at least about 90 weight % iron, at least about 3.40 weight % carbon, from about 1 to 2.5 weight % silicon, from about 0.4 to 1.0 weight % manganese, and from about 0.02 to 0.07 weight % tin. Preferably, the gray iron compositions of the invention also include from about 0.2 to about 0.5 weight % chromium, and may further preferably include from about 0.25 to 0.75 % molybdenum and/or from about 0.3 to 1.0 % copper, and may optionally also include small amounts (less than about 1 %) of such elements as titanium or vanadium, as examples. The gray iron compositions may advantageously be used in the manufacture of vehicle brake components, especially the braking surfaces of vehicle brake drums (10) or brake rotors.
Abstract:
A cladding material for centrifugal casting rolls which contains 2.5-4.7 % C, 0.8-3.2 % Si, 0.1-2.0 % Mn, 0.4-1.9 % Cr, 0.6-5 % Mo, 3.0-10.0 % V, and 0.6-7.0 % Nb, these elements satisfying the following relationships (1) to (4): (1) 2.0 + 0.15V + 0.10Nb
Abstract translation:一种用于离心铸造辊的包覆材料,其包含2.5-4.7%C,0.8-3.2%Si,0.1-2.0%Mn,0.4-1.9%Cr,0.6-5%Mo,3.0-10.0%V和0.6-7.0% Nb,这些元素满足以下关系式(1)〜(4):(1)2.0 + 0.15V + 0.10Nb C(%),(2)1.1 Mo / Cr,(3)Nb / V = 0.8,(4)0.2 Nb / V,余量由Fe和不可避免的杂质组成,并且包括浇注温度为1400℃以上的颗粒状MC型碳化物和石墨。
Abstract:
Disclosed are methods of hardfacing and hardfaced tool joints used for connecting together dirlling pipe for drilling bore holes in the earth, such as drilling to possible oil and gas formations. The hardfacing (24) is welded to the outer surface of the box member (12) of the tool joint and forms a surface harder than silicious earth particles but a surface which does not cut casing through which the drilling pipe (14) and tool joints move. Hardfacing alloys having the foregoing properties contain primary carbides in a matrix which are present in an amount to form a plurality of cracks of not less than one in 3 inches on cooling from molten to solid state are satisfactory. Such cracking causes no damage to the box member (12), provides an indication of the primary carbides present and hence the abrasion resistance of the hardfacing (24) and provides a long wearing service life for the box member (12).