US2001024621A1PendingUtilityA1

Steel composition and chain formed thereof

27
Priority: Feb 14, 2000Filed: Feb 2, 2001Published: Sep 27, 2001
Est. expiryFeb 14, 2020(expired)· nominal 20-yr term from priority
Inventors:Rainer R. Leppanen
C21D 1/25C22C 38/46C22C 38/44C21D 1/18C22C 38/42C22C 38/04
27
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Claims

Abstract

A chain type steel, suitable for the production of bars with a diameter of up to about 160 mm, e.g. to be used for the manufacture of heavy anchor chains, including, in weight-%: C 0.15-0.23 Si 0.10-0.40 Mn 1.00-1.50 P max. 0.025 S max. 0.025 Cr 1.50-2.20 Ni 0.80-1.50 Mo 0.30-0.60 Cu  max. 0.30 Al <0.2 V <0.2 Nb <0.2 Ti <0.2 the balance being Fe.

Claims

exact text as granted — not AI-modified
1 . A steel suitable for the production of bars with a diameter of up to about 160 mm comprising, in weight-%:  
                                           C   0.15-0.23         Si   0.10-0.40         Mn   1.00-1.50         P   max. 0.025         S   max. 0.025         Cr   1.50-2.20         Ni   0.80-1.50         Mo   0.30-0.60         Cu    max. 0.30         Al   <0.2         V   <0.2         Nb   <0.2         Ti   <0.2                                                       the balance being Fe.    
     
     
         2 . The steel according to    claim 1   , comprising, in weight-%:  
                                           C   0.19-0.21         Si   0.20-0.30         Mn   1.15-1.25         P   max. 0.015         S   max. 0.020         Cr   1.65-1.75         Ni   1.15-1.25         Mo   0.42-0.48         Cu    max. 0.25         Al   <0.2         V   <0.2         Nb   <0.2         Ti   <0.2                                                       the balance being Fe.    
     
     
         3 . The steel according to    claim 1   , comprising, in weight-%:  
                                           C   0.18-0.20         Si   0.20-0.30         Mn   1.15-1.25         P   max. 0.015         S   max. 0.020         Cr   1.65-1.75         Ni   1.15-1.25         Mo   0.30-0.36         Cu    max. 0.25         V   0.10-0.14         Al   <0.2         V   <0.2         Nb   <0.2         Ti   <0.2                                                        the balance being Fe.    
     
     
         4 . The steel according to    claim 2   , being hardened at 850° C. and tempered at 615° C.  
     
     
         5 . The steel according to    claim 3   , hardened at 890° C. and tempered at above 630° C.  
     
     
         6 . The steel according to    claim 6   , tempered at 645° C.  
     
     
         7 . A chain formed from the steel according to    claim 1   .  
     
     
         8 . A chain formed from the steel according to    claim 2   .  
     
     
         9 . A chain formed from the steel according to    claim 3   .

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