REPORT OF PRELIMINARY STRESS-CORROSION CRACKING TESTS OF TYPE-347 STAINLESS STEEL CAPSULES CONTAINING SODIUM HYDROXIDE
Stress corrosion cracking tests of Type-347 stainless steel were conducted at 636 deg F for periods up to 1800 hr with 1- and 4-m sodium hydroxide. A capsule specimen (consisting of 1-in. schedule 40-pipe and welding caps) containing the solutions was evaluated as a test to detect susceptibility to caustic cracking. Stressed U-bend specimens were also tested in the capsules. Eight out of eight capsules not stress-relieved after welding failed in the welds and welded regions by tranagranular cracking in approximately 100 hr. Two out of four capsules with stress-relieved welds failed in a thin wall gage section at a stress level of about 22,000 psi. Corrosion in specimens exposed for 1425 hr was predominately intergranular. One out of eight U-bend specimens (not stress- relieved) failed. The results show that an as-welded capsule-type specimen containing 1- to 4-molal sodium hydroxide at 636 deg F is a satisfactory test for detecting susceptibility to caustic cracking. (auth)
- Research Organization:
- Knolls Atomic Power Lab., Schenectady, N.Y.
- DOE Contract Number:
- W-31-109-ENG-52
- NSA Number:
- NSA-13-018100
- OSTI ID:
- 4231848
- Report Number(s):
- KAPL-M-GEG-12
- Country of Publication:
- United States
- Language:
- English
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