Specialists in Materials Engineering, Corrosion and Failure Analysis
Categories
- The Corrosion Forum
- The Failure Analysis Forum
- Paint/Protective Coatings Engineering
- Concrete Testing (Petrography)
- Research & Development Forum
- General Materials Forum
- New & Used Equipment
- Technical Articles
Welcome, Guest
Want to take part in these discussions? Sign in if you have an account, or apply for one belowVanilla 1.0.3 is a product of Lussumo. More Information: Documentation, Community Support.
The Failure Analysis Forum: Pressure Vessel Failure - 4140 with Ferritic Nitro Carborizing
Bottom of Page1 to 1 of 1
-
- CommentAuthorcylinder_engineer
- CommentTimeSep 28th 2009 edited
Experiencing failure in charged nitrogen pressure vessel.
Original design, 4140 annealed cylinder (threads into plate, seals on oring) with chrome internal seal surface. Only internal seal surface is chrome plated. Other surfaces are painted or bare steel.
New design, 4140 annealed cylinder with Ferritic Nitro Carborizing (FNC). All surfaces are FNC'd.
In last year, experienced 3 cracked cylinders with new design. It cracks at radius above threads behind oring seal.
Only change is listed above. Any ideas what could cause failure?
1 to 1 of 1