Wire rods having excelling in wire drawability

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/34 (2006.01) B21B 1/16 (2006.01) B21B 3/00 (2006.01) B21B 43/00 (2006.01) C21D 9/52 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/18 (2006.01)

Patent

CA 2642935

A hot-rolled wire which has excellent suitability for drawing and which, even when heavily drawn from a large diameter, can be sufficiently inhibited from breaking. The hot-rolled wire contains 0.35-0.65% C, 1.4-3.0% Si, 0.10-1.0% Mn, 0.1-2.0% Cr, up to 0.025% (excluding 0%) P, up to 0.025% (excluding 0%) S, up to 0.006% (excluding 0%) N, up to 0.1% (excluding 0%) Al, and up to 0.0030% (excluding 0%) O, with the remainder being iron and unavoidable impurities. The content of hydrogen in the steel is 2.50 ppm or lower. The wire has a hardness (HV) not higher than 460×C0 0.1 (wherein C0 indicates carbon content (mass%) in the position located at a depth of D/4 (D: diameter of the wire)).

La présente invention concerne un fil laminé à chaud qui présente une excellente adaptativité au tréfilage et qui, même s'il est fortement tréfilé à partir d'un large diamètre, peut être suffisamment protégé de la casse. Le fil laminé à chaud contient de 0,35 à 0,65 % de C, de 1,4 à 3,0 % de Si, de 0,10 à 1,0 % de Mn, de 0,1 à 2,0 % de Cr, jusqu'à 0,025 % (0 % étant exclu) de P, jusqu'à 0,025 % (0 % étant exclu) de S, jusqu'à 0,006 % (0 % étant exclu) de N, jusqu'à 0,1 % (0 % étant exclu) d'Al et jusqu'à 0,0030 % (0 % étant exclu) d'O, le reste de la composition étant composée de fer et d'impuretés inévitables. La teneur en hydrogène de l'acier est de 2,50 ppm maximum. Le fil présente une dureté (HV) inférieure à 460 x C0 0,1 (C0 indiquant la teneur en carbone (% en masse) en un point situé à une profondeur correspondant à D/4 (D : diamètre du fil)).

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