Form This specification covers an aircraft-quality@ corrosion and heat-resistant steel in the form of bars@ wire@ forgings@ mechanical tubing@ flash welded rings@ and stock for forging or flash welded rings. Application These products have been used typically for parts requiring a combination of high room temperature tensile properties with oxidation resistance up to 1000 ??(538 ?? and where control of ferrite content is necessary@ but usage is not limited to such applications.