Here is the English version of the overview of Hastelloy C-22 alloy steel pipe:

Overview of Hastelloy C-22 Alloy Steel Pipe

Hastelloy C-22 is a nickel-based corrosion-resistant alloy (belonging to the C-series alloys), widely used in harsh chemical, energy, and marine environments due to its excellent corrosion resistance and high-temperature stability. The following details its composition, properties, applications, and standards:

I. Chemical Composition (Typical Values, Referencing ASTM Standards)

Element	Content (%)	Role
Nickel (Ni)	Balance (≥56%)	Base element, providing good corrosion resistance and high-temperature strength.
Chromium (Cr)	20.0-22.5	Forms a passive film to resist oxidizing acids (e.g., nitric acid) and stress corrosion cracking.
Molybdenum (Mo)	12.5-14.5	Enhances resistance to non-oxidizing acids (e.g., hydrochloric, sulfuric acid) and pitting/crevice corrosion.
Tungsten (W)	2.5-3.5	Works synergistically with molybdenum to further improve local corrosion resistance.
Iron (Fe)	2.0-6.0	Improves the workability and strength of the alloy.
Cobalt (Co)	≤2.5	Increases the high-temperature hardness and strength of the alloy.
Carbon (C)	≤0.015	Extremely low carbon content reduces the tendency for intergranular corrosion (compared to early C-series alloys like Hastelloy C-276).
Silicon (Si)	≤0.08	Controls impurities and improves casting performance.
Manganese (Mn)	≤1.0	Controls impurities and enhances processing stability.
Phosphorus (P)	≤0.02	Reduces impurity content to avoid brittleness.
Sulfur (S)	≤0.02	Reduces impurity content to avoid hot shortness.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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