Conditions for approval required by: Julien Gauther
_________________________
Certification of Aerospace Products to international quality Standards
Certification of Aerospace Products to international quality Standards
Form restricted to registered, logged in users. Please return to the home page and use the Create Account option.
On QTRs (EN2874H140 and H160), § B (heat treatment):
Precipitation hardening parameters here are a little bit different from AMS5662N, §3.5.2.
The purpose is to get tensile, fatigue tests, etc… results compliant, which is the case.
On QTRs (EN2874H140 and H160), § D (hardness test): According to manufacturing route, these hardness tests have been done on bolt blanks just after heat treatment.
Hardness test shall be done at this operation or just after thread rolling (prior to surface treatment)?
Maybe just after thread rolling, hardness tests may not be suitable since this test leaves a mark.
On QTR EN2874H140, thread grain flow: it is written ISO9152, but it is ISO9154.
On QTR EN2874H140, tensile test on specimen: ISO9154 requires ISO6892-1 standard for tensile test on test specimens.
But I think ASTM E8/E8M could be considered as equivalent.
On QTR EN2874H160, thread grain flow: ISO9152 is mentioned, but it is ISO9154.
On QTR EN2874H160, discontinuities: it is mentioned ISO9152, but it is ISO9154.
On QTR EN2874H160, tensile test on specimen: ISO9154 requires ISO6892-1 standard for tensile test on test specimens.
But I think ASTM E8/E8M could be considered as equivalent