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Revision A, February 21, 1952

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Includes all amendments and changes through Change/Amendment , February 21, 1952

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CNCL S/S BY QQ-S-00763
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Description / Abstract:

Classes 1,8and 9, type A materials are generally preferred for resistance to most severelly corrosive media, and are generally more resisting than the other classes.

Class 1, type A, and class 8 materials are intended primarily for use in applications where are welding is necessary, subsequent annealing and quenching is impracticable, and exposure to most severely corrosive media is involved, class 8 being superior.

Class 1, types B and C materials are intended primarily for structural applications where welding is limited to spot welding or similar methods.

Class 2 material is intended for uses where severe corrosion is not a problem and very little welding other than spot welding is employed.

Classes 3 and 4 materials are intended for structural parts in applications where corrosive conditions are of primary consideration; class 4 is regarded the superior corrosion-resisting material.

Class 5 material is intende3d for use in ball and roller bearing, cutlery, and other parts requiring high hardness.

Classes 6 and 7 materials are intended for use where ease of machining is required, class 6 being superior in these respects, but inferior to class 7 in regard to corrosion resistance. The slightly cold worked material has the best machineability.

Class 10 material is intended for applications where high physical properties and good resistance to salt water corrosion are required.

Class 11 material is intended for the highest temperature applications for high temperature strength and resistance to oxidation.

Class 12 material is intended for use where resistance to scaling at elevated temperatures is required.