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US 4,398,950 AGranted
High strength cold rolled, weldable steel strip
AssigneeInland Steel Company
InventorsIndra Gupta, Raymond V. Fostini, Timothy E. Moss
Life of this patent
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Abstract
A cold rolled steel strip is provided with a relatively high yield strength together with good resistance spot weldability, while avoiding rolling problems during its manufacture. This is accomplished by adding, to plain carbon steel, phosphorus in an amount greater than 0.04 wt. % up to 0.15 wt. % and 0.04-0.14 wt. % titanium.
Claims9
A strong, ductile, cold rolled steel strip having good resistance spot weldability, said strip comprising:
- a composition consisting essentially of, in wt.%:
- ______________________________________ carbon .04-.10 manganese .3-.7 silicon 0.01-0.30 aluminum 0.03-0.12 sulfur .03 max. phosphorus greater than .04 up to .15 titanium .04-.14 iron essentially the balance;
- ______________________________________
- and a yield strength in the range of about 40,000-60,000 psi (276-414 MPa).
1 more element
A method for improving the resistance spot weldability of a cold rolled steel strip having a composition consisting essentially of, in wt.%:
- ______________________________________ carbon .04-.10 manganese .3-.7 silicon 0.01-0.30 aluminum 0.03-0.12 sulfur .03 max. iron essentially the balance, ______________________________________
- while providing said cold rolled steel strip with a yield strength in the range 40,000-60,000 psi (276-414 MPa), said method comprising the step of:
- including, in the composition of said cold rolled steel strip, 0.04-0.14 wt.% titanium and greater than 0.04 up to 0.15 wt. % phosphorous.
Dependencies are inferred from the claim text.