Inquire into electrical steel technical standard system

By synthesized research on IEC?EN(BS?NF?DIN)?ASTM?JIS and GB standard system, we consider EN JIS and GB standard of electrical steel all equate or adopt revised IEC standard?They are equating or equivalent technically, but different to standard system?The product conforms to GB standard easy to use as a result of preferably integration performance; JIS product,s test method is easy to application as a individual standard. ASTM electrical standard is a absolute system.