| 摘要 |
401,491. Alloys. KRUPP AKT.- GES., F., Essen, Germany. Nov. 4, 1932, No. 31192. Convention date, Dec. 15, 1931. Addition to 401,364. [Class 82 (i).] Armour plate hardened on one side is made from those of the steel alloys set out in the parent Specification which, as regards the relation between the carbon content and the sum of the chromium and nickel contents fall under the curve A, and preferably within the area B.
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