I hope you guys can help; we have a major problem here! We manufacture aerospace hardware. One job I'm working on now is a special A286 locknut (very expensive!). Before machining we have the bar age-hardened On the spec it calls for metallurgical testing that specifies no dual-plex grain structure. After testing it was found the parts did have grain sizes from 2 to 8 (not good because that's a dual-plex structure). The material is A286 AMS5731. We've been trying to contact the metal supplier (Carpenter Technology) but they won't respond at all. Meanwhile we bought more material and cut a 1-inch sample piece to age and re-test before attempting to remake the job. We've tried to re-solution and age but that didn't work, either. I've been making sinilar parts for over 20 years and never had this trouble before. What's going on?!?! I hope you can help before I tear the rest of my hair off. Dave
- posted
17 years ago