How to distinguish between national standard elbows and second-standard elbows? Please explain it to me, experts.
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How to distinguish between national standard elbows and second-standard elbows
The original poster didn’t express themselves very clearly.
This post was last edited by gn_1984 on 2018-5-9 at 10:36. What the original poster is trying to ask is about the differences between European and American standards for elbows; the poster can take a look at the introduction to the GB/T12459-2017 standard for elbows.
The second model has the same dimensional specifications as the standard version, just thinner
\"Second grade\" means it does not meet the standards; it fails to satisfy the required criteria. For example, flanges of this grade are definitely thinner than those that comply with national standards.