EP 0739993 A1 19961030 - Steel and process for manufacturing of workpieces with high abrasion resistance
Title (en)
Steel and process for manufacturing of workpieces with high abrasion resistance
Title (de)
Stahl und Verfahren zur Herstellung von Bauteile mit hohe Abriebfestigkeit
Title (fr)
Acier et procédé pour la fabrication de pièces à haute résistance à l'abrasion
Publication
Application
Priority
FR 9505016 A 19950427
Abstract (en)
An abrasion-resistant steel contains (by wt.%) 0.24-0.3 (pref. 0.24-0.27) C, 0-2 (pref. 0-1 Si) 0-2 (pref. 0-1) Al, 0-2 (pref. 0.3-1.6) Mn, 0-4 (pref. 0-2) Ni, 0-3 (pref. 0.5-1.8) Cr, 0-0.6 Mo and 0-1.2 W. The steel may also contain 0.005-0.005% B, at least one of Nb, V, Zr and Ti in amt. less than 0.3% and at least one of Se, Te, Ca, Bi and Pb in amt. below 0.1%, the rest being Fe. The following relationships also apply, 4.6C + 1.05Mn + 0.54Ni + 0.66(Mo + W/2) + 0.5Cr + k ≥ 1.6, where k = 0 if the steel contains less than 0.0005% B and k = 0.5 if the steel contains more than 0.005% B and 0.6% ≤ (Al+Si) ≤ 2%. To improve their abrasion resistance sheets of the steel are heated to above austenisation temp. (e.g. 900 degrees C) then cooled to 450 degrees C at more than 1 degrees C/s, further cooled to 200 degrees C over 50 s to 60 minutes (pref. 100 s to 30 minutes) and finally returned to ambient (below 250 degrees C) in less than 3 h. This gives the steel a martensitic or martensitic-bainitic structure contg. 5-15% austenite and a hardness of 400-500 HB.
Abstract (fr)
Acier pour la fabrication de pièces à haute résistance à I'abrasion dont la composition chimique comprend, en poids: 0,24% <= C <= 0,3%, 0% <= Si <= 2%, 0% <= Al <= 2%, 0% <= Mn <= 2%, 0% <= Ni <= 4%, 0% <= Cr <= 3%, 0% <= Mo <= 0,6%, 0% <= W <= 1,2%, éventuellement de 0,0005% à 0,005% de bore, éventuellement au moins un élément pris parmi Nb, V, Zr et Ti, en des teneurs inférieures à 0,3%, éventuellement au moins un élément pris parmi Se, Te, Ca, Bi et Pb en des teneurs inférieures à 0,1%, le reste étant du fer et des impuretés résultant de l'élaboration; la composition chimique satisfaisant en outre les relations suivantes: 0,6% <= Al+Si <= 2% et 4,6xC + 1,05xMn + 0,54xNi + 0,66x (Mo+W/2) + 0,5xCr+K >= 1,6, avec K = 0 si l'acier contient moins de 0,0005% de bore et K = 0,5 si l'acier contient plus de 0,0005% de bore. Procédé de fabrication d'une pièce et utilisation.
IPC 1-7
IPC 8 full level
C21D 6/00 (2006.01); C22C 38/00 (2006.01); C22C 38/44 (2006.01); C22C 38/54 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP KR US)
C21D 9/00 (2013.01 - KR); C22C 38/22 (2013.01 - KR); C22C 38/44 (2013.01 - EP KR US); C22C 38/54 (2013.01 - EP US)
Citation (search report)
- [A] FR 1551909 A 19690103
- [A] DE 4337148 C1 19941027 - THEILE J D GMBH [DE]
Designated contracting state (EPC)
AT BE DE ES GB IT SE
DOCDB simple family (publication)
EP 0739993 A1 19961030; EP 0739993 B1 19991201; EP 0739993 B2 20051123; EP 0739993 B8 20060308; AT E187207 T1 19991215; AU 5064896 A 19961107; AU 692377 B2 19980604; BR 9602054 A 19991013; DE 69605350 D1 20000105; DE 69605350 T2 20000824; DE 69605350 T3 20060727; ES 2141446 T3 20000316; ES 2141446 T5 20060601; FR 2733516 A1 19961031; FR 2733516 B1 19970530; JP 4058562 B2 20080312; JP H08295990 A 19961112; KR 100204545 B1 19990615; KR 960037857 A 19961119; US 5714116 A 19980203; ZA 963295 B 19961106
DOCDB simple family (application)
EP 96400737 A 19960405; AT 96400737 T 19960405; AU 5064896 A 19960415; BR 9602054 A 19960425; DE 69605350 T 19960405; ES 96400737 T 19960405; FR 9505016 A 19950427; JP 13266096 A 19960430; KR 19960013323 A 19960427; US 63717796 A 19960424; ZA 963295 A 19960425