Forging products have been like steel products in recent years. Generally, carbon steel parts, especially small pieces of 200Kg, have many manufacturers. Some of them are surplus. For medium-sized forgings, 0.5T-10T heavy forgings are mostly shafts, flanges and tubes. There are many plates and ring gears, and the domestic market is gradually increasing. The market competition is also becoming increasingly fierce. Medium weight forging materials are more complicated, it often includes low alloy steel: such as 16Mn, 20MnMo, 35CrMo; medium carbon alloy structural steel such as: 40Cr, 40CrNi, 5CrMnMo, 3Cr2W8, 34CrNi3Mo, etc., stainless steel 2Cr13, 3Cr13, 4Cr13, 1Cr18Ni9Ti, 0Cr17Ni12Mo2 , 0Cr17Ni14Mo2, 0Cr19Ni9; high carbon alloy steel such as: 65Mn, 60CrNiMo, 60SiMnMo, etc., the problem of such forgings is: forgings are not qualified after forging, often showing flawless bottom waves, or internal pores, loose, mixed , cracks and other defects, some can be repaired by heat treatment, or repair welding, but sometimes the internal defects are serious, it can not be repaired, resulting in waste, and sometimes the manufacturer and the user negotiated downgrade use.
Large forgings above 20T, such as rolls, steam turbine rotors, marine low-speed diesel crankshafts, marine drive shafts, reactor shells, etc. There are few manufacturers of such large forgings, and there are also quality problems. For example, when a large roll produced by a factory is used, the whole piece falls off, and sometimes defects appearing inside the steel ingot are brought into the forging. This is a steelmaking problem, and the problem of the medium forging is There are few manufacturers in the production of forging steel ingots. For example, there are few domestic enterprises that produce stainless steel ingots of 5T or more, which makes the forging factory have no choice and is also prone to monopoly. Moreover, steel mills do not produce forging steel ingots. Generally, carbon steel or medium and low carbon alloy steel ingots can be produced in several domestic heavy machine factories, but stainless steel is difficult. Domestic heavy machine factories do not have stainless steel AOD furnaces or VOD furnace, so it is recommended to add AOD furnace to the heavy equipment factory to ease the contradiction of stainless steel ingots.
Large forgings above 20T, such as rolls, steam turbine rotors, marine low-speed diesel crankshafts, marine drive shafts, reactor shells, etc. There are few manufacturers of such large forgings, and there are also quality problems. For example, when a large roll produced by a factory is used, the whole piece falls off, and sometimes defects appearing inside the steel ingot are brought into the forging. This is a steelmaking problem, and the problem of the medium forging is There are few manufacturers in the production of forging steel ingots. For example, there are few domestic enterprises that produce stainless steel ingots of 5T or more, which makes the forging factory have no choice and is also prone to monopoly. Moreover, steel mills do not produce forging steel ingots. Generally, carbon steel or medium and low carbon alloy steel ingots can be produced in several domestic heavy machine factories, but stainless steel is difficult. Domestic heavy machine factories do not have stainless steel AOD furnaces or VOD furnace, so it is recommended to add AOD furnace to the heavy equipment factory to ease the contradiction of stainless steel ingots.
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