US2006005899A1PendingUtilityA1

Steel composition for use in making tillage tools

32
Individually held — no corporate assignee on recordPriority: Jul 8, 2004Filed: Jul 8, 2004Published: Jan 12, 2006
Est. expiryJul 8, 2024(expired)· nominal 20-yr term from priority
Inventors:John T. SponzilliBilly SallasDavid R. Dobbins
A01B 71/00C22C 38/02C22C 38/18C22C 38/04
32
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

A steel composition for use in making tillage tools is disclosed. The steel composition is tailored to provide a superior combination of wear resistance and impact toughness for the tillage tools. In one embodiment, the steel composition includes from 0.30 to 0.35% of carbon; from 1.00 to 1.25% of manganese; from 0.0005 to 0.003% of boron; from 0.15 to 0.30% of silicon; not more than 0.30% of nickel; from 0.10 to 0.30% of chromium, the nickel and chromium together being not more than 0.40%; from 0.001 to 0.004% of calcium; not more than 0.035% of phosphorous; not more than 0.015% of sulfur; not more than 0.10% of copper; not more than 0.040% of molybdenum; the balance being iron and incidental impurities, wherein all percentages are percentages by weight of the total composition. The steel composition may be formed into tillage tools using conventional methods.

Claims

exact text as granted — not AI-modified
1 . A steel composition for use in making tillage tools, the steel composition comprising: 
 from 0.25 to 0.40% of carbon;    from 0.90 to 1.40% of manganese;    from 0.0005 to 0.005% of boron;    from 0.15 to 0.25% of silicon;    nickel at not more than 0.30%;    from 0.10 to 0.30% of chromium, the nickel and chromium together being not more than 0.40%; and    at least 97% iron and incidental impurities,    wherein the composition has a hardness on the Rockwell “C” scale in the range of 49 to 52, and    wherein all percentages are percentages by weight of the total composition.    
   
   
       2 . The steel composition of  claim 1  wherein the composition comprises: 
 from 0.30 to 0.35% of carbon;    from 1.00 to 1.25% of manganese; and    from 0.0005 to 0.003% of boron.    
   
   
       3 . The steel composition of  claim 2  wherein the composition comprises: 
 from 0.001 to 0.004% of calcium; and    not more than 0.015% of sulfur.    
   
   
       4 . (canceled)  
   
   
       5 . The steel composition of  claim 1  wherein: 
 the composition includes 85% minimum globular sulfide inclusions.    
   
   
       6 . The steel composition of  claim 1  wherein the composition comprises: 
 not more than 0.035% of phosphorous;    not more than 0.10% of copper; and    not more than 0.040% of molybdenum.    
   
   
       7 . The steel composition of  claim 6  wherein: 
 the composition consists essentially of    from 0.30 to 0.35% of carbon;    from 1.00 to 1.25% of manganese;    from 0.0005 to 0.003% of boron;    from 0.15 to 0.25% of silicon;    nickel at not more than 0.30%;    from 0.10 to 0.30% of chromium, the nickel and chromium together being not more than 0.40%;    from 0.001 to 0.004% of calcium;    not more than 0.035% of phosphorous;    not more than 0.015% of sulfur;    not more than 0.10% of copper;    not more than 0.040% of molybdenum;    the balance being iron and incidental impurities,    wherein all percentages are percentages by weight of the total composition.    
   
   
       8 . The steel composition of  claim 1  wherein: 
 the composition consists essentially of    from 0.25 to 0.40% of carbon;    from 0.90 to 1.40% of manganese;    from 0.0005 to 0.005% of boron;    from 0.15 to 0.25% of silicon;    nickel at not more than 0.30%;    from 0.10 to 0.30% of chromium, the nickel and chromium together being not more than 0.40%;    from 0.001 to 0.004% of calcium;    not more than 0.035% of phosphorous;    not more than 0.015% of sulfur;    not more than 0.10% of copper;    not more than 0.040% of molybdenum;    the balance being iron and incidental impurities,    wherein all percentages are percentages by weight of the total composition.    
   
   
       9 . The steel composition of  claim 8  wherein: 
 the composition consists essentially of    from 0.30 to 0.35% of carbon;    from 1.00 to 1.25% of manganese;    from 0.0005 to 0.003% of boron;    from 0.15 to 0.25% of silicon;    nickel at not more than 0.30%;    from 0.10 to 0.30% of chromium, the nickel and chromium together being not more than 0.40%;    from 0.001 to 0.004% of calcium;    not more than 0.035% of phosphorous;    not more than 0.015% of sulfur;    not more than 0.10% of copper;    not more than 0.040% of molybdenum;    the balance being iron and incidental impurities,    wherein all percentages are percentages by weight of the total composition.    
   
   
       10 . A tillage tool comprising: 
 a steel composition comprising    from 0.25 to 0.40% of carbon;    from 0.90 to 1.40% of manganese;    from 0.0005 to 0.005% of boron;    from 0.15 to 0.25% of silicon;    nickel at not more than 0.30%;    from 0.10 to 0.30% of chromium, the nickel and chromium together being not more than 0.40%; and    at least 97% iron and incidental impurities,    wherein the composition has a hardness on the Rockwell “C” scale in the range of 49 to 52, and    wherein all percentages are percentages by weight of the total composition.    
   
   
       11 . The tillage tool of  claim 10  wherein the composition comprises: 
 from 0.30 to 0.35% of carbon;    from 1.00 to 1.25% of manganese; and    from 0.0005 to 0.003% of boron.    
   
   
       12 . The tillage tool of  claim 11  wherein the composition comprises: 
 from 0.001 to 0.004% of calcium; and    not more than 0.015% of sulfur.    
   
   
       13 . (canceled)  
   
   
       14 . The tillage tool of  claim 12  wherein: 
 the composition includes 85% minimum globular sulfide inclusions.    
   
   
       15 . The tillage tool of  claim 12  wherein the composition comprises: 
 not more than 0.035% of phosphorous;    not more than 0.10% of copper; and    not more than 0.040% of molybdenum.    
   
   
       16 . The tillage tool of  claim 15  wherein: 
 the composition consists essentially of    from 0.30 to 0.35% of carbon;    from 1.00 to 1.25% of manganese;    from 0.0005 to 0.003% of boron;    from 0.15 to 0.25% of silicon;    nickel at not more than 0.30%;    from 0.10 to 0.30% of chromium, the nickel and chromium together being not more than 0.40%;    from 0.001 to 0.004% of calcium;    not more than 0.035% of phosphorous;    not more than 0.015% of sulfur;    not more than 0.10% of copper;    not more than 0.040% of molybdenum;    the balance being iron and incidental impurities,    wherein all percentages are percentages by weight of the total composition.    
   
   
       17 . The tillage tool of  claim 10  wherein: 
 the composition consists essentially of    from 0.25 to 0.40% of carbon;    from 0.90 to 1.40% of manganese;    from 0.0005 to 0.005% of boron;    from 0.15 to 0.25% of silicon;    nickel at not more than 0.30%;    from 0.10 to 0.30% of chromium, the nickel and chromium together being not more than 0.40%;    from 0.001 to 0.004% of calcium;    not more than 0.035% of phosphorous;    not more than 0.015% of sulfur;    not more than 0.10% of copper;    not more than 0.040% of molybdenum;    the balance being iron and incidental impurities,    wherein all percentages are percentages by weight of the total composition.    
   
   
       18 . The tillage tool of  claim 17  wherein: 
 the composition consists essentially of    from 0.30 to 0.35% of carbon;    from 1.00 to 1.25% of manganese;    from 0.0005 to 0.003% of boron;    from 0.15 to 0.25% of silicon;    nickel at not more than 0.30%;    from 0.10 to 0.30% of chromium, the nickel and chromium together being not more than 0.40%;    from 0.001 to 0.004% of calcium;    not more than 0.035% of phosphorous;    not more than 0.015% of sulfur;    not more than 0.10% of copper;    not more than 0.040% of molybdenum;    the balance being iron and incidental impurities,    wherein all percentages are percentages by weight of the total composition.    
   
   
       19 . The tillage tool of  claim 10  wherein: 
 the tillage tool is selected from harrow disks, cultivator sweeps, coulters, opener disks, chisel points, chisel shovels.    
   
   
       20 . The tillage tool of  claim 10  wherein: 
 the tillage tool is a harrow disk.    
   
   
       21 . A tillage tool comprising: 
 a steel composition consisting essentially of    from 0.30 to 0.35% of carbon;    from 1.00 to 1.25% of manganese;    from 0.0005 to 0.003% of boron;    from 0.15 to 0.25% of silicon;    nickel at not more than 0.30%;    from 0.10 to 0.30% of chromium, the nickel and chromium together being not more than 0.40%;    from 0.001 to 0.004% of calcium;    not more than 0.035% of phosphorous;    not more than 0.015% of sulfur;    not more than 0.10% of copper;    not more than 0.040% of molybdenum;    the balance being iron and incidental impurities,    wherein the steel composition has a hardness on the Rockwell “C” scale in the range of 49 to 52, and    wherein all percentages are percentages by weight of the total composition.    
   
   
       22 . The tillage tool of  claim 21  wherein: 
 the tillage tool is selected from harrow disks, cultivator sweeps, coulters, opener disks, chisel points, chisel shovels.    
   
   
       23 . The tillage tool of  claim 21  wherein: 
 the tillage tool is a harrow disk.    
   
   
       24 . (canceled)  
   
   
       25 . The tillage tool of  claim 21  wherein: 
 the composition includes 85% minimum globular sulfide inclusions.

Join the waitlist — get patent alerts

Track US2006005899A1 — get alerts on status changes and closely related new filings.

We store only your email — no account needed. See our privacy policy.