Patent ID: 7892605
Filing Date: 2011-02-22
Classification: B32B,C21D,C23C,Y10T

Abstract:
1. A process for producing a quenched formed body comprising the following performed sequentially: preparing a formed-body steel material on which a zinc-plated layer is coated, wherein the zinc-plated layer contains at least Al and has an alloying-retarding function and a readily-oxidizing function, wherein Al is present in the zinc-plated layer in an amount of from 0.15% to 20% by mass wherein % by mass is based on the total weight of the zinc-plated layer as 100% by mass, wherein said zinc-plated layer is coated onto the formed-body steel material by molten zinc-plating; and heating the formed-body steel material coated with the zinc-plated layer in a single step to a temperature of from 800° C. to 950° C. in an oxidizing atmosphere comprising oxygen in an amount of 0.1% by volume or more, then quenching said formed-body steel material coated with the zinc-plated layer by continuously cooling in one step the heated formed-body steel material without heating, thereby producing: a quenched formed body comprising an after-quenching formed-body steel material having the zinc-plated layer disposed on the surface, wherein the zinc-plated layer has been subjected to the quenching along with said formed-body steel material, wherein the zinc-plated layer comprises Zn as a major component and 30% by mass or less of Fe; and wherein said zinc-plated layer which comprises Zn as a major component and 30% by mass or less of Fe is present in an amount of 30 g/m