US 2006/0140814 A1 · Steel composition for the production of cold rolled multiphase steel products

Abstract

The present invention is related to a steel composition intended to be used in a process including a cold rolling step, for the production of uncoated, electro-galvanized or hot dip galvanized TRIP steel products, the composition being characterized by a specific addition of phosphorus. The latter is added in order to reach the desired mechanical properties (high tensile strength in combination with high elongation) while keeping a good weldability by sufficiently reducing the carbon content. The invention is further related to a process for producing a steel product, and to the steel product obtained, said product having the composition of the invention.

Claims19

Dependent claims

A steel composition intended to be used in a process comprising a cold rolling step, for the production of uncoated, electro-galvanised or hot dip galvanised TRIP steel products, said composition comprising:

C:
between 1300 ppm and 2600 ppm,
Mn:
between 10000 ppm and 22000 ppm,
Al:
between 8000 ppm and 15000 ppm,
Si:
between 2000 ppm and 6000 ppm,
P:
between 400 and 1000 ppm,
S:
maximum 120 ppm,
N:
maximum 200 ppm,
Ti:
maximum 1000 ppm,
Nb:
maximum 1000 ppm,
V:
maximum 1000 ppm,
B:
maximum 10 ppm.
the remainder being substantially iron and incidental impurities.

20 more elements

Dependencies are inferred from the claim text.

Steel composition for the production of cold rolled multiphase steel products

Life of this patent

Steel composition for the production of cold rolled multiphase steel products

Life of this patent

Abstract

Claims19