Abrasion-resistant steel plate

Details Abrasion-resistant steel plate Abrasion-resistant steel plate

2011-08-16

2011-08-16

Yee, Deborah (Department: 1733)

Metal treatment

Stock

Ferrous

C148S320000, C148S332000, C148S333000, C148S334000, C148S335000, C148S336000, C148S330000, C420S109000, C420S110000, C420S121000, C420S126000, C420S128000

Reexamination Certificate

active

07998285

ABSTRACT:
The invention concerns a method for making an abrasion resistant steel plate having a chemical composition comprising: 0.1%≦C<0.23%; 0%≦Si≦2%; 0%≦Al≦2%; 0.5%≦Si+Al≦2%; 0%≦Mn≦2.5%; 0%≦Ni≦5%; 0%≦Cr≦5%; 0%≦Mo≦1%; 0%≦W≦2%; 0.05%≦Mo+W/2≦1%; 0%≦Cu≦1.5%; 0%≦B≦0.02%; 0%≦Ti≦0.67%; 0%≦Zr≦1.34%; 0.05%<Ti+Zr/2≦0.67%; 0%≦S≦0.15%; N<0.03%, optionally 0% to 1.5% of Cu; optionally Nb, Ta and V such that Nb/2+Ta/4+V≦0.5%; optionally Se, Te, Ca, Bi, Pb contents ≦0.1%; the rest being iron impurities. Additionally: 0.095%≦C*=C−Ti/4−Zr/8+7×N/8, Ti+Zr/2−7×N/2≧0.05% and 1.05×Mn+0.54×Ni+0.50×Cr+0.3×(Mo+W/2)1/2+K>1.8, with K=1 if B≧0.0005% and K=0 if B<0.0005%. After austenitization, the method consists in: cooling at a speed >0.5° C./s between a temperature between AC3and T=800−270×C*−90×Mn−37×Ni−70×Cr−83×(Mo+W/2) and about T−50° C.; then cooling at a speed 0.1<Vr<1150×ep−1.7between T and 100° C., (ep=plate thickness in mm); cooling down to room temperature and optionally planishing. The invention also concerns the resulting plate.

REFERENCES:
patent: 5645794 (1997-07-01), Beguinot et al.
patent: 5695576 (1997-12-01), Beguinot
patent: 5714116 (1998-02-01), Beguinot et al.
patent: 5900082 (1999-05-01), Hewitt
patent: 6251198 (2001-06-01), Koo et al.
patent: 6423426 (2002-07-01), Kobayashi et al.
patent: 1072689 (2001-01-01), None
patent: 10053814 (1998-02-01), None
patent: 10324952 (1998-12-01), None
patent: 2000199034 (2000-07-01), None
patent: 2000-239791 (2000-09-01), None
patent: 9840522 (1998-09-01), None
Machine-English translation of Japanese patent 09-249935, Kushida Takahiro, Sep. 22, 1997.
Computer-generated English translation of Japanese patent 10324952 Watari, Koji et al. Dec. 8, 1998.

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