What material is 718 steel?

The full name is Inconel 718. Inconel 718 alloy is a precipitation hardening nickel-chromium-iron alloy containing niobium and molybdenum bai. It has high strength, good toughness and corrosion resistance in high and low temperature environments below 650°C.

The delivery state can be a solution treatment or a precipitation hardening state. The material should be heated to the upper limit of the processing temperature during hot processing. In order to ensure the plasticity during processing, the final processing temperature when the deformation reaches 20% should not be lower than 960℃.

The oxide near the weld of the Inconel718 workpiece is more difficult to remove than the stainless steel. It needs to be polished with a fine sanding belt. Before pickling in a mixed acid of nitric acid and hydrofluoric acid, the oxide should be removed with sandpaper or a salt bath deal with.

Before welding, the surface of the material should be clean, free of oil stains, and no powder notes, etc., and the bright metal should be polished within 25mm of the weld.

Inconel718 preheating:

The surface of the workpiece must be cleaned before and during heating to keep the surface clean.

If the heating environment contains sulfur, phosphorus, lead or other low melting point metals, Inconel718 alloy will become brittle. Impurities come from marking paint, chalk, lubricating oil, water, fuel, etc.

The sulfur content of fuel should be low. For example, the impurity content of liquefied gas and natural gas should be less than 0.1%, the sulfur content of city gas should be less than 0.25g/m3, and the sulfur content of petroleum gas should be less than 0.5%.

The heated electric furnace should have a more precise temperature control capability, and the furnace gas must be neutral or weakly alkaline, and fluctuations in the oxidizing and reducing properties of the furnace gas should be avoided.More about :718 steel