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hastelloy C-276——General corrosion

The uniform corrosion resistance of hastelloy C-4 alloy is basically the same as that of hastelloy C alloy in various media. The most important feature of this alloy is that the C, Si and Fe contents are controlled at a low level, so the carbide and intermetallic phase precipitates are less, which makes the uniform corrosion resistance better than hastelloy C and Hastelloy C-276 alloy, especially welding. The corrosion resistance of the post- or aged alloy remains substantially at the solid solution level (Tables 8-40). Figure 8-31 and Figure 8-32 show the isocorrosion of this alloy in H2SCV and HN03. In strong reducing media (such as hydrochloric acid), its corrosion resistance is not as good as hastelloy C-276 alloy, but it is worse than hastelloy C-276 alloy in strong oxidative corrosion medium.

Table 8-40 Corrosion resistance of hastelloy C-4 alloy in some acid media

medium

Acid concentration/%

temperature/T

腐蚀速度/mm •â」

固溶水冷

TIG焊态

时效态(900℃,100h)

Formic acid

20

boiling

0.0725

0. 0875

0. 0875

hydrochloric acid

10

75

0.900

0. 850

0.875

Nitric acid

10

boiling

0. 1475

0. 1775

0. 2300

phosphoric acid

85

boiling

1.525

1.300

0. 2125

sulfuric acid

10

boiling

0.550

0. 750

0. 500

sulfuric acid

85

75

0.575

0.425

0.525

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Post time: Jun-03-2019