FUNDAMENTAL STUDY OF THE CORROSION OF 18/13/1 CHROMIUM NICKEL STEEL IN NITRIC ACID. A Review of Progress to February 1, 1953

Technical Report · Mon Jun 15 04:00:00 EDT 1953

OSTI ID:4292768

Jones, H N

A study has been commenced to determine the mechanism of corrosive attack by boiling 70% nitric acid on 18/13/1 steel. It has been established that attack initially takes place at crystal boundaries, and the metallographic evidence so far obtained suggests the presence at some boundnries of a phase which encourages attack. Attempts to identify such a phase, which could only be present in minute proportion, have so far been unsuccessful. It has also been shown that heat treatment of the steel affects crystal boundary attack. By heat treating at 1050 to ll00 deg C, followed by rapid cooling, boundary attuck was reduced to a minimum. Up to 24 hours the time at temperature had little effect. It is recommended that a series of 18/13 alloys containing varying amounts of columbium carbide be prepared, so that the effect of changes in the columbium carbide content of the steel may be studied in relation to boundary attack. It is also suggested that an electro-chemical study be made of the behavior of niobium carbide coupled to 18/13 austenitic steel, in nitric acid solution. (auth)

• Research Organization: Gt. Brit. Culcheth Labs., Culcheth, Lancs, England
• NSA Number: NSA-13-008948
• OSTI ID: 4292768
• Report Number(s): RDB(C)/TN-44
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AUSTENITE
BOILING
CHROMIUM STEELS
COOLING
CORROSION
CRYSTALS
ELECTROCHEMISTRY
GRAIN BOUNDARIES
HEAT TREATMENTS
HIGH TEMPERATURE
METALLOGRAPHY
METALLURGY AND CERAMICS
NICKEL ALLOYS
NIOBIUM CARBIDES
NITRIC ACID
PHASE DIAGRAMS
SOLUTIONS
STANDARDS
STEELS
VELOCITY