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Galvanized or galvannealed silicon steel

A technology of zinc coating and annealing, applied in coating, hot dip plating process, metal material coating process, etc., can solve problems such as the cost impact of steel sheet

Active Publication Date: 2011-04-27
ARCELORMITTAL INVESTIGACION Y DESARROLLO SL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this has the major drawback that high levels of tensile strength, i.e. around 800 MPa, can only be achieved when the carbon content is increased
However, this has an impact on the cost of the steel sheet

Method used

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  • Galvanized or galvannealed silicon steel
  • Galvanized or galvannealed silicon steel
  • Galvanized or galvannealed silicon steel

Examples

Experimental program
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Embodiment Construction

[0072] will now be described by way of non-limiting description and reference to figure 1 , 2 The examples given in and 3 illustrate the invention.

[0073] A first test was carried out using samples (A-E) from 0.8 mm thick sheets made of steel of the composition indicated in Table I. Annealing of the steel sheet is carried out in a radiant tube furnace comprising a first heating zone, a second heating zone, a third heating zone and a soaking zone, followed by a cooling zone.

[0074] Table I: Chemical composition of the steel sheets of the present invention, in % by weight, the balance of the composition being iron and unavoidable impurities (samples A-E).

[0075] Table I

[0076] C

mn

Si

Al

Mo

Cr

P

Ti

V

Ni

Nb

0.20

1.73

1.73

0.01

0.005

0.02

0.01

0.005

0.005

0.01

0.005

[0077] The wettability and adhesion of sample A annealed according to the invention w...

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Abstract

The invention deals with a hot-dip galvanized or galvannealed steel sheet wherein, the composition of the steel sheet comprises, by weight: 0.01 <= C <= 0.22%, 0.50 <= Mn <= 2.0%, 0.2 <= Si <= 3.0%, 0.005 <= Al <= 2.0%, Mo < 1.0%, Cr <= 1.0%, P < 0.02%, Ti <= 0.20%, V <= 0.40%, Ni <= 1.0%, Nb <= 0.20%, the balance of the composition being iron and unavoidable impurities resulting from the smelting, and the steel sheet comprises a layer of an internal nitride of at least one type of nitride selected from a Si nitride, Mn nitride, Al nitride, complex nitride comprising Si and Mn, or Al and Si, or Al and Mn, or complex nitride comprising Si, Mn and Al, said steel sheet comprising no further outer layer of iron nitride.

Description

technical field [0001] The present invention relates to a method of manufacturing hot-dip galvanized or zinc-coated annealed steel sheets containing a high silicon content. Background technique [0002] Steel sheets are usually coated with a zinc-based coating by hot-dip galvanizing before being sent to the car manufacturer in order to improve corrosion resistance. After leaving the zinc bath, the galvanized steel sheet is usually subjected to an annealing which promotes the alloying of the zinc coating with the iron in the steel (so-called galvannealing). This coating made of a zinc-iron alloy provides better solderability than zinc coatings. [0003] In order to meet the need to lighten the structure of powered land vehicles, it is known to use high tensile strength steel sheets, such as TRIP steels (the term TRIP stands for Transformation Induced Plasticity), which combine high mechanical strength with very Possibility of high deformation levels. TRIP steels have a mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/02C23C2/06C23C2/28
CPCC23C2/02C23C2/28C23C2/0222C23C2/261C23C2/0224C23C2/06
Inventor F·波特兰德J-M·马泰格纳
Owner ARCELORMITTAL INVESTIGACION Y DESARROLLO SL