Alloy 400 is a solid state of bimetallic alloy, in a wide temperature range, with high strength, good toughness, resistance to a variety of corrosive environment advantages.
The nickel-copper 400 operates at temperatures up to 427 ° C and operates at temperatures up to 538 ° C in a sulfur-free oxidation environment, and the material exhibits excellent mechanical properties at temperatures below zero. , Cold work can strengthen the material.
Application
The alloy 400 is widely used and is mainly used in marine and chemical treatment environments. The main uses include valves, pumps, pump shafts, drive shafts, marine fixtures and fasteners, chemical treatment equipment, gasoline cylinders, water tanks, crude oil distillation, , Pipes, boiler feed water heaters, heat exchangers, oxygen scavengers and so on.
chemical component%
C | S | Mn | Si | Ni | Cu | Fe |
0.03 | 0.024 | 2 | 0.5 | 63-70 | Rest | 2.5 |
Corrosion resistance
Alloy 400 does not produce chloride stress corrosion cracking. In general, alloy 400 in the reduction environment corrosion resistance is good, but in the oxidation environment, corrosion resistance is poor.
In the normal temperature and high temperature environment, alloy 400 resistant to a variety of corrosion, including the vast majority of alkaline substances, salt, water (including salt water), food, organic matter.
But the material can not be used for strong oxidizing acids such as nitric acid and nitrous acid
Alloy 400 can tolerate less than 80% sulfuric acid and less than 20% hydrochloric acid.
The alloy 400, which is harmless to the alloy 400, may also cause corrosion of the alloy 400 if it contains oxide impurities such as ferric chloride, iron sulfate, chromate, nitrate, peroxide and copper.
Heat treatment
Cold working and hot working of the alloy 400 can be done by annealing or stress removal to obtain the required strength and ductility while reducing the deformation caused by processing.
Annealing treatment
The heat treatment is carried out in a sulfur-free reduction environment. The annealing temperature range is 704-982 ° C), but the most common temperature range is 871-982 ° C. If a lower annealing temperature is used, for example 740-816 ° C, the heat treatment time is prolonged to reduce the grain thickness.
In addition to stress treatment
Stress relief is the release of stress without changing the grain structure. Heated to 538-566 ° C, insulation 1-2 hours, can remove the hot or cold processing of the workpiece stress.
Processing performance
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