A composite roll for rolling having a structure comprising centrifugally cast outer and intermediate layers of an Fe-based alloy integrally fused to an inner layer of ductile cast iron; the outer layer having a composition comprising by mass 1-3% of C, 0.3-3% of Si, 0.1-3% of Mn, 0.5-5% of Ni, 1-7% of Cr, 2.2-8% of Mo, 4-7% of V, 0.005-0.15% of N, and 0.05-0.2% of B, the balance being Fe and inevitable impurities; the intermediate layer containing 0.025-0.15% by mass of B; the B content in the intermediate layer being 40-80% of that in the outer layer; and the total amount of Cr, Mo, V, Nb and W in the intermediate layer being 40-90% of that in the outer layer.

Disclosed is an abrasive and corrosive wear-resistant high chromium cast iron containing: 1.0 to 3.0 wt % of carbon (C); 0.5 to 2.0 wt % of silicon (Si); 0.5 to 2.0 wt % of manganese (Mn); 25.0 to 36.0 wt % of chromium (Cr); 0.5 to 3.0 wt % of nickel (Ni); 0.3 to 2.0 wt % of molybdenum (Mo); 0.5 to 1.5 wt % of copper (Cu); 0.2 to 2.0 wt % of vanadium (V); 0.03 to 0.3 wt % of titanium (Ti); more than 0 wt % but not more than 0.03 wt % of niobium (Nb); more than 0 wt % but not more than 0.03 wt % of zirconium (Zr); more than 0 wt % but not more than 0.3 wt % of nitrogen (N); more than 0 wt % but not more than 0.03 wt % of cobalt (Co); and iron (Fe) balance and other unavoidable impurities. Further disclosed are a method of preparing the same cast iron and a part of a FGD apparatus of a thermoelectric power plant.

Disclosed is an abrasive and corrosive wear-resistant high chromium cast iron containing: 1.0 to 3.0 wt % of carbon (C); 0.5 to 2.0 wt % of silicon (Si); 0.5 to 2.0 wt % of manganese (Mn); 25.0 to 36.0 wt % of chromium (Cr); 0.5 to 3.0 wt % of nickel (Ni); 0.3 to 2.0 wt % of molybdenum (Mo); 0.5 to 1.5 wt % of copper (Cu); 0.2 to 2.0 wt % of vanadium (V); 0.03 to 0.3 wt % of titanium (Ti); more than 0 wt % but not more than 0.03 wt % of niobium (Nb); more than 0 wt % but not more than 0.03 wt % of zirconium (Zr); more than 0 wt % but not more than 0.3 wt % of nitrogen (N); more than 0 wt % but not more than 0.03 wt % of cobalt (Co); and iron (Fe) balance and other unavoidable impurities. Further disclosed are a method of preparing the same cast iron and a part of a FGD apparatus of a thermoelectric power plant.

The present invention provides a composite roll for rolling including an outer layer having excellent wear resistance, surface roughening resistance, crack resistance, and accident resistance due to segregation of MC carbides being suppressed to adjust the amount of graphite to be crystallized. The composite roll for rolling of the present invention is a composite roll for rolling that has an outer layer and is produced through centrifugal casting, and the outer layer contains C in an amount of 2.2 mass % to 3.2 mass %, Si in an amount of 1.0 mass % to 3.0 mass %, Mn in an amount of 0.3 mass % to 2.0 mass %, Ni in an amount of 3.0 mass % to 7.0 mass %, Cr in an amount of 0.5 mass % to 2.5 mass %, Mo in an amount of 1.0 mass % to 3.0 mass %, V in an amount of 2.5 mass % to 5.0 mass %, Nb in an amount of more than 0 mass % and 0.5 mass % or less, and a remaining portion including Fe and inevitable impurities, and a condition (a): Nb mass %/V mass %<0.1, and a condition (b): 2.1C mass %+1.2Si mass %Cr mass %+0.5Mo mass %+(V mass %+Nb mass %/2)13.0 mass % are satisfied.

A cast iron material and methods for using same are disclosed, as well as a method for producing and/or lining a mould. The cast iron material has a change in length at temperatures of ?60? C. to 440? C., more particularly in the temperature range from 0? C. to 420? C., which change in length is as small as possible or as similar as possible to that of carbon fibre reinforced polymer or glass-fibre reinforced plastic. The cast iron material has at least the following proportions in percent by weight as elements or as compounds of carbon in the range from approximately 1.5% to 4.0%, silicon in the range from approximately 1.0% to 5.0%, manganese in the range from approximately 0.1% to 1.5%, nickel in the range from approximately 36.5% to 48.0%, chrome in the range from approximately 0.01 to 0.25%, phosphorus to approximately 0.08%, copper to approximately 0.5%, magnesium to approximately 0.150%, the remainder being iron and unavoidable impurities.

A method of manufacturing a brake disk made of gray cast iron is disclosed. The method includes casting a disk body using gray cast iron containing 3.1 wt % to 3.7 wt % of C; machining a surface of the cast disk body; nitriding the disk body by exposing the machined surface to a temperature in the range of 540 C. to 580 C. for 50 min to 70 min, and coating the nitrided disk body.

A method of manufacturing a brake disk made of gray cast iron is disclosed. The method includes casting a disk body using gray cast iron containing 3.1 wt % to 3.7 wt % of C; machining a surface of the cast disk body; nitriding the disk body by exposing the machined surface to a temperature in the range of 540 C. to 580 C. for 50 min to 70 min, and coating the nitrided disk body.

Provided is a cylindrical member made of flake graphite cast iron that has practical processability as well as excellent mechanical strength and further is excellent in abrasion resistance and seizing resistance. Specifically, provided is a cylindrical member made of flake graphite cast iron, the flake graphite cast iron including a composition containing, in terms of mass %, 2.85% or more and 3.35% or less of C, 1.95% or more and 2.55% or less of Si, 0.45% or more and 0.8% or less of Mn, 0.03% or more and 0.25% or less of P, 0.15% or less of S, 0.15% or more and 0.55% or less of Cr, 0.15% or more and 0.65% or less of Mo, 0.15% or more and 0.65% or less of Ni, and the balance of Fe and inevitable impurities.

Provided is a cylindrical member made of flake graphite cast iron that has practical processability as well as excellent mechanical strength and further is excellent in abrasion resistance and seizing resistance. Specifically, provided is a cylindrical member made of flake graphite cast iron, the flake graphite cast iron including a composition containing, in terms of mass %, 2.85% or more and 3.35% or less of C, 1.95% or more and 2.55% or less of Si, 0.45% or more and 0.8% or less of Mn, 0.03% or more and 0.25% or less of P, 0.15% or less of S, 0.15% or more and 0.55% or less of Cr, 0.15% or more and 0.65% or less of Mo, 0.15% or more and 0.65% or less of Ni, and the balance of Fe and inevitable impurities.

Embodiments of an alloy that can be resistant to cracking. In some embodiments, the alloy can be advantageous for use as a hardfacing alloys, in both a diluted and undiluted state. Certain microstructural, thermodynamic, and performance criteria can be met by embodiments of the alloys that may make them advantageous for hardfacing.