No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing since 1989

-----

Corrosion of precipitation hardenable stainless steel

We are supplying a manufacturer of connecting pins with 17/4PH, AISI 630 type of steel bars. They are ground to his finished size and tolerance. After part machining he sends them to a heat treatment shop for precipitation hardening at 482°C for 1 hr in vacuum.
Some of these parts appear after heat treatment to have a lightly corroded surface.

Do you have any ideas what this surface corrosion could be and where it could come from.

Best regards

Barrington Tennant
- Germany
2003

The oxidation is likely due to incomplete evacuation of the vacuum chamber, or due to a less than perfect seal. Contamination on the door seals can cause the latter. Also, make sure that the surface of the stainless steel component is clean and dry, with no residual oil prior to placement in the furnace.

Toby Padfield
- Michigan
2003

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: