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Method for making a coated steel part having very high resistance after heat treatment

A very high-level, component-based technology, applied in the manufacture of steel components, capable of solving problems such as harmful, polluting, impairing the proper operation of furnaces, etc.

Active Publication Date: 2011-07-06
ARCELOR FRANCE (FR)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since heat treatment is generally carried out in furnaces where the parts move with rollers, the surface of the latter can be contaminated with layers originating from the partial melting of the pre-coat, which impairs the proper operation of the furnace
Moreover, incomplete alloying of the precoat is detrimental during subsequent electrophoretic operations

Method used

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  • Method for making a coated steel part having very high resistance after heat treatment
  • Method for making a coated steel part having very high resistance after heat treatment
  • Method for making a coated steel part having very high resistance after heat treatment

Examples

Experimental program
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Effect test

Embodiment Construction

[0026] Examine changes in the steel / coating interface in conventional manufacturing methods. For this, consider steel parts with a thickness of 1.2 or 2mm, which contain the following composition by weight:

[0027] Carbon: 0.15-0.25%;

[0028] Manganese: 0.8-1.5%;

[0029] Silicon: 0.1-0.35%;

[0030] Chromium: 0.01-0.2%;

[0031] Titanium: <0.1%;

[0032] Phosphorus: <0.05%;

[0033] Sulfur: <0.03%;

[0034] Boron: 0.0005%-0.01%.

[0035] The parts are pre-coated using a traditional hot dip process in which they are dipped in an aluminum-based bath containing

[0036] Silicon: 9-10%;

[0037] Iron: 2-3.5%,

[0038] The balance consists of aluminum and unavoidable impurities.

[0039] Contacting steel with a bath of pure aluminum above 660°C is known to result in the rapid formation of thick layers of intermetallic alloys, especially containing FeAl 3 -Fe 2 Al 5 layer formation. The addition of 10% silicon in the bath may reduce the thickness of the intermediate...

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Abstract

The invention concerns a method for making a part with very high mechanical characteristics from a hot- or cold-rolled steel strip, comprising precoating said strip with aluminum or an aluminum alloy, cold process deformation of the coated strip, optionally cutting off excess plate metal in view of the final shape of the part, heating the part so as to produce an intermetallic compound from the steel-coating interface and to austenize the steel, transferring the part into an equipment, cooling the part inside the equipment at a speed such that the steel structure after cooling is martensitic,or bainitic or martensito-bainitic. The precoating is performed by electroplating, chemical or physical vapour deposition, or combined rolling.

Description

technical field [0001] The invention relates to the manufacture of hot-rolled or cold-rolled coated steel parts having high mechanical strength and good corrosion resistance. Background technique [0002] For certain applications, it is desirable to manufacture steel parts that combine high mechanical strength, high impact resistance and good corrosion resistance. This combination is particularly required in the automotive industry, where the aim is to produce significantly lighter vehicles. This can be achieved in particular by using steels with very high mechanical properties: intrusion-resistant, structural or safety parts of automobiles (crash beams, door or central pillar reinforcements, wheel spokes) require properties such as those described above. [0003] Patent FR2807447 discloses a manufacturing method in which a base steel sheet with a metallic pre-coating is provided, the steel having a fracture strength of about 500 MPa; subjected to a cold forming operation, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00C23C22/78
CPCC23C2/26C21D1/673C21D2211/008C23C2/28C21D9/48C23F17/00C25D5/48C23C26/00C21D2211/002C21D8/02C23C16/06
Inventor J-P·劳伦特J·德弗洛克
Owner ARCELOR FRANCE (FR)
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