Why do similar steel grades from different countries or manufacturers have different names or representations?
This is largely because they have been derived or originated in countries of completely different cultures with different approaches to the naming system. The product standards generally use a sequential numbering system eg., AS/NZS 3678, AS/NZS 3679 or ASTM A515, ASTM A516, or EN10025 for all steel standards. Adjacent standards may be for completely different materials or processes. Generally when there are a number of grades within a standard they are grouped and listed sequentially with some regard to either the chemistry (eg K1010, K1020) or the strength (eg 250, 350). It may be acceptable to interchange or substitute material from a different standard where the grades are equivalent. To determine if a particular grade is a suitable alternative, you must first review all of the requirements from the product standard for the materials concerned. If the standard requirements are similar or within the design limitations (you may need to get an engineering opinion) for the purpose for
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