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ASTM etchant No. 106 - High temperature steels - Chemical etching

Material Name: High temperature steels
Recipe No.: 11422
Primary Chemical Element in Material: Fe
Sample Type: Bulk
Uses: General microstructure
Etchant Name: ASTM etchant No. 106
Type (Macro/Micro): Micro
Etching Method: Chemical
Etchant (Electrolyte) Composition: 7 ml HNO3 25 ml HCl 10 ml methanol (99%).
Procedure (Condition): Use fresh to avoid pitting. Immerse or swab 10-60 s.
Note: General structure
Reference: 1984 Annual book of ASTM Standards, Vol. 03.03, Metals Test Methods and Analytical Procedures, Metallography; Nondestructive Testing; ASTM, Philadelphia, PA ((1984), pp. 389-405.