US2024425958A1PendingUtilityA1

Ultra-high strength hot-rolled steel with toughness and method of fabricating same

Assignee: BIG RIVER STEEL LLCPriority: Oct 2, 2020Filed: Sep 5, 2024Published: Dec 26, 2024

Est. expiryOct 2, 2040(~14.2 yrs left)· nominal 20-yr term from priority

Inventors:Amar Kumar De Denis Hennessy Chirag R. Mahimkar

C22C 38/06C21D 6/005B21B 3/02C21D 8/0226C22C 38/04B22D 11/001C21D 6/002C22C 38/26C22C 38/28

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References

Claims

Abstract

A hot-rolled steel sheet includes the following composition by weight percentage: 0.045%<carbon<0.06%; 1.20%<manganese<1.50%; 0.02%<aluminum<0.04%; 0.09%<titanium<0.15%; 0.035%<niobium<0.06%; 0.00%<chromium<0.25%, with the balance being iron and impurities inherent in processing. The hot-rolled steel sheet has an ultra-high yield strength greater than or equal to 550 MPa.

Claims

exact text as granted — not AI-modified

We claim: 
     
         1 . A hot-rolled steel sheet comprises the following composition by weight percentage:
 0.045%&lt;carbon&lt;0.06%,   1.20%&lt;manganese&lt;1.50%,   0.02%&lt;aluminum&lt;0.04%,   0.09%&lt;titanium&lt;0.15%,   0.035%&lt;niobium&lt;0.06%,   0.00%&lt;chromium&lt;0.25%, with the balance being iron and impurities inherent in processing; and   the hot-rolled steel sheet has an ultra-high yield strength greater than or equal to 550 MPa.   
     
     
         2 . A hot-rolled steel sheet as set forth in  claim 1  wherein the hot-rolled steel sheet has an impact toughness of at least 25 J at a temperature of −40° F. 
     
     
         3 . A hot-rolled steel sheet as set forth in  claim 2  having a thickness less than 20 mm. 
     
     
         4 . A hot-rolled steel sheet as set forth in  claim 3  having an ultra-high yield strength greater than or equal to 690 MPa.

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