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Thanks much, Ulla and Robert! In a web search last night, TRIMMING LINE also came up in this context. I'm still hoping for someone with access to English steel vernacular to pin this down in this context, preferably with (a) specific US or UK industrial reference(s) rather than from a translated English document.
All the best from Wild Wonderful West Virginia,
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28 mins confidence: peer agreement (net): +1
Explanation: was my first idea and I got a confirmation by Google, the site below shows a pic.