Back to results
US 12,305,257 B2Granted
Cold rolled steel sheet
AssigneeJfe Steel Corporation
InventorsShinichi Furuya, Takeshi Matsuda
Life of this patent
Estimating the term…
Abstract
Provided is a cold rolled steel sheet with excellent press formability, which contains a binder satisfying specific requirements and wax satisfying specific requirements, and has a layer containing the wax in a specific mass ratio at a specific coating weight.
Claims8
A cold rolled steel sheet having a layer on at least one side, wherein
- the layer contains a binder A and natural wax B,
- the binder A is at least one selected from the group consisting of a copolymer of styrene and maleic acid, a copolymer of styrene and maleic anhydride, and a salt of copolymer of styrene and maleic acid,
- the natural wax B is at least one selected from paraffin wax and microcrystalline wax having 20 or more carbon atoms, and the natural wax B has a median size α of 0.2 μm or more and 2.5 μm or less and a melting point β of 100° C. or higher and 115° C. or lower,
- a mass ratio C of the natural wax B, which is defined by the following formula (1), is 20% or more,
- C={MB/(MA+MB)}×100 (1)
- where MA is an acid anhydride-equivalent mass of the binder (A), and
- MB is a mass of the natural wax B, and
- a coating weight D of the layer is 0.5 g/m2 or more.
5 more elements
Dependencies are inferred from the claim text.