US2013037182A1PendingUtilityA1

Mechanical part made of steel having high properties and process for manufacturing same

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Assignee: ASCOMETAL SAPriority: Apr 7, 2010Filed: Apr 7, 2011Published: Feb 14, 2013
Est. expiryApr 7, 2030(~3.7 yrs left)· nominal 20-yr term from priority
Inventors:Thomas Sourmail
C21D 8/00C22C 38/02C22C 38/44C21D 1/19C22C 38/18C21D 2211/002C21D 6/005C21D 1/18C22C 38/46C22C 38/58C22C 38/04C21D 9/00C21D 6/002
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Claims

Abstract

A mechanical steel part in steel with high characteristics, characterized in that its composition, comprising in weight percentages, is 0.05%≦C≦0.25%; 1.2%≦Mn≦2%; 1%≦Cr≦2.5%; wherein the contents of C, Mn and Cr are such that (830-270C %-90 Mn %-70Cr %)≦560; 0<Si≦1.55; 0<Ni≦1%; 0<Mo≦0.5%; 0<Cu≦1%; 0<V≦0.3%; 0<Al≦0.1%; 0<B≦0.005%; 0<Ti≦0.03%; 0<Nb≦0.06%; 0<S≦0.1%; 0<Ca≦0.006%; 0<Te≦0.03%; 0<Se≦0.05%; 0<Bi≦0.05%; 0<Pb≦0.1%; the remainder of the steel part being iron and impurities resulting from processing, and wherein the in that its structure of the steel is bainitic and contains no more than a total of 20% of martensite and/or pro-eutectoid ferrite and/or pearlite.

Claims

exact text as granted — not AI-modified
1 . A mechanical steel part in comprising in weight percentages:
 0.05%≦C≦0.25%;   1.2%≦Mn≦2%;   1%≦Cr≦2.5%;   wherein the contents of C, Mn and Cr are such that (830-270C %-90Mn %-70Cr %)≦560;   0<Si≦1.5%;   0<Ni≦1%;   0<Mo≦0.5%;   0<Cu≦1%;   0<V≦0.3%;   0<Al≦0.1%;   0<B≦0.005%;   0<Ti≦0.03%;   0<Nb≦0.06%;   0<S≦0.1%;   0<Ca≦0.006%;   0<Te≦0.03%;   0<Se≦0.05%;   0<Bi≦0.05%;   0<Pb≦0.1%;   the remainder of the steel part being iron and impurities resulting from processing, and wherein the structure of the steel is bainitic and contains no more than a total of 20% of martensite and/or pro-eutectoid ferrite and/or pearlite.   
     
     
         2 . The part according to  claim 1 , wherein ≦0<Si≦0.3%. 
     
     
         3 . The part according to  claim 1 , wherein 0.8≦Si≦1.5%. 
     
     
         4 . The part according to  claim 1 , wherein Ni≦0.5%. 
     
     
         5 . The part according to  claim 1 , wherein 0.04%≦Mo≦0.5%. 
     
     
         6 . The part according to  claim 1 , wherein 0.05%≦V≦0.3%. 
     
     
         7 . The part according to  claim 1 , wherein 0.005%≦Al≦0.1%. 
     
     
         8 . The part according to  claim 1 , wherein 0.0005%≦B≦0.005% and 0<N≦0.0080% and Ti %≦3.5%. 
     
     
         9 . The part according to  claim 1 , wherein 0.005%≦Ti≦0.03%. 
     
     
         10 . The part according to  claim 1 , wherein 0.005%≦S≦0.1%. 
     
     
         11 . A process for manufacturing a steel part comprising the following steps:
 preparing a steel blank or bar whose composition conforms to  claim 1 ;   hot-working the blank or bar an austenitic phase by forging or rolling;   cooling the hot-worked blank or bar at a rate that imparts a bainitic structure thereto, wherein the cooled, hot-worked blank or bar contains a total of no more than 20% martensite and/or pearlite and/or pro-eutectoid ferrite; and   optionally carrying out one or more machining operation(s) to give the part its final dimensions and surface condition.   
     
     
         12 . The process according to  claim 11  wherein, before or after the machining operation(s), tempering is performed over a temperature range of 200 to 350° C. for 30 minutes to 4 hours. 
     
     
         13 . The process according to  claim 11 , wherein the hot-worked blank or bar is cooled naturally in still air. 
     
     
         14 . The process according to  claim 11 , wherein the hot-worked blank or bar is cooled in forced air.

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