Coated steel strips, coated stamped products and methods
A pre-coated steel strip is provided. The steel strip includes a strip of base steel having a length, a width, a first side, and a second side. The length of the strip is at least 100 m and the width is at least 600 mm. An aluminum or an aluminum alloy pre-coating is on at least part of at least one of the first or second sides of the strip of base steel. A thickness t p of the pre-coating is from 20 to 33 micrometers at every location on at least one of the first or second sides. Processes, coated stamped products and land motor vehicles are also provided.
1. A precoated steel product comprising:
a strip of base steel having a first side and a second side, the strip having a width of at least 600 mm; and
a precoating on at least one of the first side and the second side,
the precoating being made of an aluminum alloy and having a controlled thickness of no more than 33 micrometers at every location on at least one of said first and second sides;
wherein the aluminum alloy pre-coating comprises from 8 to 11% silicon by weight and from 2% to 4% iron by weight, the remainder being aluminum and impurities inherent in processing.
2. The precoated steel product according to claim 1 , wherein the controlled thickness of said pre-coating is no more than 33 micrometers at every location on both said first and second sides.
3. The precoated steel product according to claim 1 , wherein the controlled thickness of said pre-coating is from 20 to 33 micrometers at every location on at least one of said first and second sides.
4. The precoated steel product according to claim 1 , wherein the controlled thickness of said pre-coating is from 20 to 33 micrometers at every location on both said first and second sides.
5. The precoated steel product of claim 1 , wherein the base steel comprises the following components by weight based on total weight:
0.15%<carbon<0.5%;
0.5%<manganese<3%;
0.1%<silicon<0.5%;
0.01%<chromium<1%;
titanium<0.2%;
aluminum<0.1%;
phosphorus<0.1%;
sulfur<0.05%;
0.0005%<boron<0.08%;
iron;
and impurities inherent in processing.
6. The precoated steel product according to claim 5 , wherein the base steel comprises the following components by weight based on total weight:
0.20%<carbon<0.5%;
0.8%<manganese<1.5%;
0.1%<silicon<0.35%;
0.01%<chromium<1%;
titanium<0.1%;
aluminum<0.1%;
phosphorus<0.05%;
sulfur<0.03%;
0.0005%<boron<0.01%,
iron;
and impurities inherent in processing.
7. The precoated steel product of claim 5 , wherein the base steel comprises 20 ppm or less of sulfur.
8. The precoated steel product of claim 1 , wherein the strip has a length of at least 100 meters.