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Related to case-hardening: Case hardening compound
1.In timber, a condition in which the outer layers have dried without shrinkage, causing stress between the inner and outer layers.
2. Producing a hard surface layer on steel, as by carburizing, cyaniding, carbonitriding, nitriding, induction hardening, and flame hardening.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.