BS 4490:1989
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Methods for micrographic determination of the grain size of steel
Hardcopy
10-03-2003
English
30-06-1989
Foreword
Committees responsible
Methods
Section one. General
1. Scope
2. Definitions
3. Symbols
4. Principle
5. Apparatus
6. Preparation of the test surface
Section two. Revealing the grains
7. Revealing the grains in the as-received conditions
8. Revealing the parent austenite grains
Section three. Measurement of the grain size
9. Measurement of grain size by an index
10. Determination of grain size by lineal analysis
11. Test report
Appendices
A. Etching reagents
B. Bechet-Beaujard picric acid method
C. Pro-eutectoid ferrite method
D. Bainite or gradient quench method
E. Kohn method by controlled oxidation
F. McQuaid-Ehn method by carburization
G. Determination of grain size: AFNOR standard sheets
H. Determination of grain size: ASTM standard sheets
J. Snyder-Graff method
Tables
1. Symbols
2. Relationship between indices for the usual
magnification
3. Evaluation of number of grains as a function of
various parameters, for GE
4. Evaluation of grains as a function of various
parameters, for GA
Figures
1. Evaluation of the number of grains in an area
enclosed by a circle
2. Measurement grid for the intersected segment method
3. Evaluation of the number of grains (twin grains)
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