Method for making an abrasion-resistant steel plate

Details Method for making an abrasion-resistant steel plate Method for making an abrasion-resistant steel plate

2003-11-13

2008-12-02

Yee, Deborah (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S547000, C148S548000, C148S654000, C148S660000, C148S661000

Reexamination Certificate

active

07459041

ABSTRACT:
The invention concerns a method for making an abrasion resistant steel plate having a chemical composition comprising: 0.35%≦C≦0.8%, 0%≦Si≦2%; 0%≦AI≦2%; 0.35%≦Si+AI≦2%; 0%≦Mn≦2.5%; 0%≦Ni≦5%; 0% ≦Cr≦5%; 0%≦Mo≦0.050; 0%≦W≦1%; 0,1%≦Mo+W/2≦0.5%; 0%≦B≦0.02%; 0%≦Ti≦2%; 0%≦Zr≦4%; 0.05%≦Ti+Zr/2≦2%; 0%≦S≦0.15%; N≦0,03; optionally 0% to 1.5% of Cu; optionally Nb, Ta or V with Nb/2+Ta/4 +V≦0.5%; optionally less than 0.1% of Se, Te, Ca, Bi or Pb; the rest being iron and impurities; the composition satisfying: 0.1 %<C*=C−Ti/4−Zr/8+7×N/8≦0.55% and 1.05×Mn+0.54×Ni+0.5O×Cr+0.3×(Mo+W/2)1/2+K>1.8, with K=0.5 if B ≧0.0005% and K=0 if B<0.0005% and Ti+Zr/2−7×N/2≧0.05%; hardening after austenitization while cooling at a speed >0.5 ° C./s between a temperature >AC3and ranging between T=800−270×C*−9O×Mn−37×Ni−70×Cr−83×(Mo+W/2) and T−50° C.; then at a core speed Vr<1150×ep−1.7between T and 100° C., (ep=plate thickness in mm); cooling down to room temperature. The invention also concerns the resulting plate.

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Computer-generated English translation of Japanese patent 10-324952, Watari, Koji et al. Dec. 8, 1998.

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