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Old ASTM material designations 1
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You might be interested in this web site that contains a list of withdrawn ASTM Specifications. You can go back and locate the ASTM Spec for firebox quality steel. The ASTM A-181 is still valid.
For steels that were supplied under withdrawn ASTM specifications, in some cases there is no equivalent material substitution. Instead, upgraded materials have taken their place. As steel-making technology progressed over time, ASTM standards were revised or withdrawn.
For the firebox quality steel, I can tell you that the substitute used today is ASME SA 515 Grade 70.
For steels that were supplied under withdrawn ASTM specifications, in some cases there is no equivalent material substitution. Instead, upgraded materials have taken their place. As steel-making technology progressed over time, ASTM standards were revised or withdrawn.
For the firebox quality steel, I can tell you that the substitute used today is ASME SA 515 Grade 70.
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