1. Rationale
Two parts to work item Part 1,There continues to be a problem with some entities around the world using non-instrumented loading rings to effect a cheap and sloppy method of loading in tension type 1a1 and 1a2 samples. Many believe there now is potentially a flight safety risk involved and I propose to you a new paragraph, 6.1.1, that should preclude this risk. Part 2, A revision to F519 was executed in 2006 to address a number of issues and editorially update a number of references to MIL specs etc. The old military heat treat spec, MIL-H-6875 had been recently cancelled and replaced by heat treat spec AMS 2759 (under which my AMS Committee that I Chaired, (B), had jurisdiction). For reasons not known, in editorially translating from the old Mil spec to the new AMS spec, we in F07.04 referenced only Class A as a protective atmosphere, when for decades any protective atmosphere in Mil-H-6875 was allowed. To correct this problem for the purpose of improving efficiency, scheduling and cost, the proposed change allows the option in para 9.2.5 to allow Class B - endothermic or carbon containing nitrogen (nitrogen methanol or other natural - synthetic base) which is the world standard controlled protective atmosphere for low alloy steels.
Keywords
cleaner; coating; delayed failure; fluids; hydrogen embrittlement; maintenance chemicals; plating/coating; steel; stress cracking; threshold; Aircraft chemicals/processes; Delayed failure; Electrodeposited coatings; Electroplated coatings; Electroplated steel coatings; Hydrogen embrittlement (HE); Maintenance chemicals; Mechanical analysis/testing; Plating (and baking) processes; Service environments;
Citing ASTM Standards
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