Method for improving the weldability of high manganese content steel strips and coated steel strip

Patent metadata

Field	Value
Publication number	US-2016281252-A1
Application number	US-201414777868-A
Country	US
Kind code	A1
Filing date	Mar 12, 2014
Priority date	Mar 21, 2013
Publication date	Sep 29, 2016
Grant date	—

Abstract

In a method for improving the weldability of high-manganese-containing steel strips which contain (in % by weight) from 6 to 30% of manganese, up to 1% of carbon, up to 15% of aluminum, up to 6% of silicon, up to 6.5% of chromium, up to 4% of copper and also total additions of titanium and zirconium of up to 0.7% and total additions of niobium and vanadium of up to 0.5%, balance iron including unavoidable steel-accompanying elements the steel strips are coated with a zinc-containing corrosion protection layer.

First claim

1 .- 12 . (canceled)

13 . A method for improving the weldability of high manganese content steel strips, comprising:
providing a steel strip containing (in weight %) 6 to 30% manganese, up to 1% carbon up to 15% aluminum, up to 6% silicone, up to 6.5% chromium, up to 4% copper, and additions of titanium and zirconium in sum of up to 0,7% and niobium and vanadium in sum of up to 0.5%, remainder iron including unavoidable steel tramp elements; and coating the steel strip with a first zinc-containing anticorrosion layer, which in addition contains manganese and/or cobalt and/or iron, for preventing a liquid metal embrittlement during welding.

14 . The method of claim 11 , wherein a thickness of the zinc-containing anticorrosion layer is between 0.1 μm and 50 μm, in particular between 0.5 μm and 12 μm.

15 . The method of claim 11 , further comprising applying a second zinc-containing layer with a thickness between 0.5 μm and 50 μm, in particular between 1 μm and 12 μm is applied onto the first zinc-containing anticorrosion.

16 . The method of claim 11 , wherein the zinc content of the first zinc-containing corrosion protection layer is 30-99 weight %, in particular 75-95 weight %.

17 . The method of claim 11 , wherein the second zinc-containing layer beside zinc further contains at least one element selected from the group consisting of aluminum, silicone, manganese and iron.

18 . The method of claim 15 , wherein the first and/or the second layer are applied electrolytically or by precipitation from a gas phase.

19 . A coated steel strip made of high-manganese-content steel with improved weldability, containing (in weight %) 6 to 30% manganese, up to 1% carbon, up to 15% aluminum, up to 6% silicone, up to 6.5% chromium, up to 4% copper, and titanium and zirconium in sum of up to 0.7%, and niobium and vanadium in sum of up to 0.5%, remainder iron and unavoidable steel tramp elements, and having a zinc-containing anticorrosion layer, which in addition contains at least one of manganese, cobalt and iron for preventing a liquid metal embrittlement during welding.

20 . The steel strip of claim 19 , wherein a thickness of the zinc containing corrosion protection layer is between 0.1 μm and 50 μm, in particular between 0.5 μm and 12 μm.

21 . The steel strip of claim 19 , further comprising a second zinc-containing layer with a thickness between 0.5 μm and 50 μm, in particular between 1 μm and 12 μm applied onto the first zinc containing anticorrosion layer.

22 . The steel strip of claim 20 , wherein a zinc content of the first zinc-containing anticorrosion layer is 30-99 weight%, in particular 75-95 weight%.

23 . The steel strip of claim 21 , wherein the second zinc-containing layer beside zinc further contains at least one element selected from the group consisting of aluminum, silicone, manganese and iron.

24 . The steel strip of claim 19 , wherein the steel strip has a carbon content of at least 0.04% in weight, a silicon content and/or aluminum content of respectively at least 0.05% in weight, a copper content of 0.02 to 4% in weight and a chromium content of 0.05 to 6.5% in weight.

Assignees

• Salzgitter Flachstahl Gmbh

Inventors

• Köhler Kai
• Debeaux Marc
• Luther Friedrich

Classifications

• C22C38/18

  containing chromium · CPC title

• C23C28/02

  only coatings {only including layers} of metallic material · CPC title

• C23C28/021

  including at least one metal alloy layer · CPC title

• C22C38/04 Primary

  containing manganese · CPC title

• C23C30/00

  Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence) · CPC title