MA22 is a multi-faceted Ni-Cr-Mo alloy with better overall corrosion resistance than other Ni-Cr-Mo alloys. MA22 has excellent corrosion resistance to both reducing and oxidizing mediums. Also, its versatility enables it to be used for processes that repeats both reducing and oxidizing conditions as well as for multipurpose equipments. In particular, MA22 shows outstanding corrosion resistance to oxidizing water solutions (acids which contain oxidizing substances, wet chlorine gas, nitric acid mixed mediums, oxidizing acids which contain chlorine ion, etc).
MA22 is highly resistant to pitting corrosion, crevice corrosion and stress corrosion cracking. MA22 shows superior corrosion resistance against a wide range of environments in chemical industrial processes. Some examples are: strong oxidizing agents such as ferric chloride and cupric chloride; high temperature mediums which contain organic or inorganic material; chlorine; formic acid; acetic acid; acetic anhydride; sea water and salt water.
MA22 is readily welded by gas tungsten arc, gas metal arc, and shielded metal arc welding techniques. Submerged arc welding is not recommended as this process is characterized by high heat input to the base metal and slow cooling of the weld.
MA22 can be formed or molded just like stainless steel. Every normal welding method is applicable to MA22, but when using it for parts where corrosion should be prevented, oxy-acetylene method and submerged arc welding are not recommended. Also, excessive heat must be avoided.
Except when noted otherwise, solution treatment is normally performed beforehand to MA22 material. By cooling it rapidly after solution treatment, MA22 achieves its best ductility, corrosion resistance, and workability. Parts produced by warm processing require solution treatment before the final assembling process or use.
Various shapes, such as flat-rolled plates, forgings, welding wire, wire, welded pipes and tubes, seamless pipes and tubes can be manufactured.
Information on specifications to which MA22 alloy can be ordered.
| Plates | Bars, Forgings | Pipes and Tubes | Joints |
|---|---|---|---|
| B575 | B564 | B619 | B366 |
| B574 | B622 | ||
| B626 |
| Plates | Bars, Forgings | Pipes and Tubes | Joints |
|---|---|---|---|
| SB-575 | SB-564 | SB-619 | SB-366 |
| SB-574 | SB-622 | ||
| SB-626 |
| Plates | Bars | Pipes and Tubes | Wires |
|---|---|---|---|
| H4551 | H4553 | H4552 | H4554 |
Corrosion data
The data below are examples of beaker tests, and do not guarantee maximum or minimum values. Selection of materials for individual usage requires tests using actual equipments.
| Solution | Concentration(wt%) | Temperature(°C) | Corrosion Rate(mm/Year) |
|---|---|---|---|
| Hydrochloric acid | 1 | 50 | 0.009 |
| 1 | boiling | 0.13 | |
| 2 | boiling | 1.72 | |
| 3 | 50 | 0.003 | |
| 5 | room temperature | 0.008 | |
| 5 | boiling | 7.95 | |
| 36 | boiling | 0.16 | |
| Hydrofluoric acid | 2 | 50 | 0.08 |
| Sulfuric acid | 1 | boiling | 0.060 |
| 10 | boiling | 0.23 | |
| 40 | boiling | 1.89 | |
| 40 | 100 | 1.11 | |
| 40 | 80 | 0.02 | |
| 40 | 60 | 0.00 | |
| 40 | 40 | 0.00 | |
| 80 | 120 | 10.3 | |
| 80 | 100 | 1.36 | |
| 80 | 80 | 0.53 | |
| 80 | 60 | 0.07 | |
| 80 | 40 | 0.02 | |
| 98.5 | 130 | 4.51 | |
| 98.5 | 110 | 5.65 | |
| 98.5 | 90 | 1.66 | |
| Phosphoric acid | 5 | boiling | 0.005 |
| 85 | boiling | 3.38 | |
| 50 | 50 | 0.001 | |
| Formic acid | 88 | boiling | <0.03 |
| Acetic acid | 99 | boiling | 0.001 |
| Nitric acid | 10 | boiling | 0.03 |
| 60 | boiling | 0.63 | |
| 60 | 60 | 0.02 | |
| 65 | boiling | 1.3 |
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