An austenitic alloy comprising (in weight %): C: 0.01-0.05 Si: 0.05-0.80 Mn: 1.5-2 Cr: 26-34.5 Ni: 30-35 Mo: 3-4 Cu: 0.5-1.5 N: 0.05-0.15 V: 0.15 the balance being Fe and unavoidable impurities, characterized in that 40% Ni+100*% N50.

An austenitic alloy comprising (in weight %): C: 0.01-0.05 Si: 0.05-0.80 Mn: 1.5-2 Cr: 26-34.5 Ni: 30-35 Mo: 3-4 Cu: 0.5-1.5 N: 0.05-0.15 V: 0.15 the balance being Fe and unavoidable impurities, characterized in that 40% Ni+100*% N50.

The method for fabrication of corrosion-resistant tubing using minimal quantities of specialized material results in corrosion-resistant tubes with a reduced capital cost. In contrast, the disclosed method uses a straight weld made along the length of the tube, rather than a spiral weld that follows its circumference. The straight weld passes up and down the tube, but only on one side, or approximately 50%, of the tube. Following application of the corrosion-resistant material by straight welding, two or more tubes are joined together into an array.

The method for fabrication of corrosion-resistant tubing using minimal quantities of specialized material results in corrosion-resistant tubes with a reduced capital cost. In contrast, the disclosed method uses a straight weld made along the length of the tube, rather than a spiral weld that follows its circumference. The straight weld passes up and down the tube, but only on one side, or approximately 50%, of the tube. Following application of the corrosion-resistant material by straight welding, two or more tubes are joined together into an array.

Systems and methods provide a flow distribution device that includes a duct for a heat recovery steam generators having a duct an expansion portion extending from an inlet portion. The expansion portion has a larger cross-sectional area than the inlet portion. The flow distribution device includes a guide vane having a curved surface. The guide vane is positioned in the duct to extend from at least a part of the inlet portion into the expansion portion.

An iron-based steel comprising at least (in wt. %): carbon (C): 0.01%-0.10%; silicon (Si): 0.02%-0.7%; manganese (Mn): 0.3%-1.0%; chromium (Cr): 8.0%-10%; molybdenum (Mo): 0.1%-1.8%; cobalt (Co): 0.8%-2.0%; nickel (Ni): 0.008% -0.20%; boron (B): 0.004% -0.01%; nitrogen (N): 0.03% -0.06%; vanadium (V): 0.1% -0.3%, particularly 0.15% -0.022% of vanadium (V), more particularly 0.185% of vanadium (V); niobium (Nb): 0.01% -0.07%; optionally tungsten (W): 2.0% -2.8%, particularly 2.4% of tungsten; the remainder being iron (Fe); wherein said steel consists in particular of these elements.

Systems and methods provide a flow distribution device that includes a duct for a heat recovery steam generators having a duct an expansion portion extending from an inlet portion. The expansion portion has a larger cross-sectional area than the inlet portion. The flow distribution device includes a guide vane having a curved surface. The guide vane is positioned in the duct to extend from at least a part of the inlet portion into the expansion portion.

Provided is a heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability, consisting of, by mass %, 43.1 to 45.5% of Cr, 0.5 to 1.5% of Mo, 0.0001 to 0.0090% of Mg, 0.001 to 0.040% of N, 0.05 to 0.50% of Mn, 0.01 to 0.10% of Si, 0.05 to 1.00% of Fe, 0.01% to 1.00% of Co, 0.01 to 0.30% of Al, 0.04 to 0.3% of Ti, 0.0003 to 0.0900% of V, 0.0001 to 0.0100% of B, 0.001 to 0.050% of Zr, and optionally one or more elements selected from (a) to (d): (a) 0.001 to 0.020% of Cu; (b) 0.001 to 0.100% of W; (c) 0.0001 or more and less than 0.0020% of Ca; and (d) 0.001% or more and less than 0.100% of Nb, and the balance of Ni with inevitable impurities.

Provided is a heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability, consisting of, by mass %, 43.1 to 45.5% of Cr, 0.5 to 1.5% of Mo, 0.0001 to 0.0090% of Mg, 0.001 to 0.040% of N, 0.05 to 0.50% of Mn, 0.01 to 0.10% of Si, 0.05 to 1.00% of Fe, 0.01% to 1.00% of Co, 0.01 to 0.30% of Al, 0.04 to 0.3% of Ti, 0.0003 to 0.0900% of V, 0.0001 to 0.0100% of B, 0.001 to 0.050% of Zr, and optionally one or more elements selected from (a) to (d): (a) 0.001 to 0.020% of Cu; (b) 0.001 to 0.100% of W; (c) 0.0001 or more and less than 0.0020% of Ca; and (d) 0.001% or more and less than 0.100% of Nb, and the balance of Ni with inevitable impurities.

The method for fabrication of corrosion-resistant tubing using minimal quantities of specialized material results in corrosion-resistant tubes with a reduced capital cost. In contrast, the disclosed method uses a straight weld made along the length of the tube, rather than a spiral weld that follows its circumference. The straight weld passes up and down the tube, but only on one side, or approximately 50%, of the tube. Following application of the corrosion-resistant material by straight welding, two or more tubes are joined together into an array.