The resistance to corrosion monel 400 offers extensively high resistance to hydrofluoric acid in the whole magnitudes to the boiling temperature. The highly resistant wire is used in the engineering alloy and offers resistance to various forms of sulfuric and hydrochloric acids in the reducing atmospheres.
Furthermore the effect of heating on the features of cold treated and hot processed wire is determined by the analysis of heating and cold drawn for three hours at temperature of 1300oF and hot treated place for three hours at temperature of 1470oF. The growth of grain occurs when the wire is heated in the upper section of the annealing temperature.
The wire shows bright and clean surface by pickling. The monel 400 is readily produced by following the standard processes. Considering the resistance of wire to hot deformation, monel 400 alloy is softer than the various steels. The hot treated wire can be given any configuration. Using adequate temperature while hot forming is essential. The hot forming temperature used is 1200oF to 2150oF. For the massive reduction the material is hot formed at temperature of 1700oF to 2150oF. The minor reduction is conduction at temperature of 1200oF. The processing of wire at the minimum temperature causes the production of large mechanical features and minor grain development.
The extensive soaking at the hot working temperature is unfavorable. In case the degradation of metal occurs while treatment, the furnace temperature is reduced to 1900oF and the higher temperature is not used as long as the operations are not begun. The alloy wire should never be heated at temperature more than 2150oF because the excessive heating may cause the permanent destruction of alloy.
The massive forging is also not recommended to conduct quickly that may cause overheating of wire while processing. Use of optical pyrometer is preferred. In the hot curving operation the metal is processed quickly after taken out from the furnace. The advanced heating tools and dies to 500oF help in avoiding cold down of the material while processing. The limited forging process is essential to fulfill the criteria of particular specifications required for forging and hot finishing.
The quantity of reduction and finishing temperature should be controlled to obtain the required features. The process of producing forging to the specifications comprises of 30 – 35% reduction for the eventual heating. This process consists of following steps: Reheating, forging to a part that has 5% larger space than the final shape such as minimum 25% reduction, cooling to 1300oF, and size finishing abut 5% reduction.
The large tensile forging for the special military requirements also needs at least 30-35% reduction after the final reheating. This process consists of following steps: reheating, forging to a part that has an area of 25% more than the end shape of 5% reduction, quenching to1300oF and size finishing of 25% reduction. The grain refinement is obtained by using the temperature about 2000oF for the final reheating and increasing the reduction magnitude made after the final reheating.