Foreword of the Author...
Myth and Methodology when comparing Steel Standards
- When comparing steel standards from different national and international standard development organizations, there is no such thing as equivalent steel standards.
At best, one may be able to group comparable steel standards together based on some defined set of rules. For example, ASTM A 516/A 516M Grade 70 is comparable to JIS G 3118 symbol SGV 480 and to EN 10028-2 steel name P295GH, based on chemical requirements and mechanical properties. Yet they are not equivalent since there are differences in their chemical compositions and mechanical properties.
Comparing steel standards is not an exact science and cannot be made into a mathematical equation where two sides of an equation are equal to one another, since there will always be differences between standards.
- There are also different standards that share the same grades of steel. For example, ASTM A 485 and EN ISO 683-17 share seven identical bearing steel grade chemical requirements, yet the body of each standard is different (that is, grain size, hardenability, microstructure and hardness, inspection, testing, etc.). As a result, these seven bearing steels within these two standards are not equivalent, but are comparable.