Ironovation Materials Technology Co., Ltd.

Xiaochuan Xiong

Hongliang Yi

Guodong Wang

Shu Zhou

Dapeng Yang

Zhiyuan Chang

Zhaoyuan Liu

Huajie Qin

Zeran Hou

Lianqian Liu

Yl Hongliang

The present invention relates to a hot-working die steel, a heat treatment method thereof and a hot-working die. Specifically, the present invention discloses a hot-working die steel, its alloying composition comprises, by weight percentage, Cu: 2˜8%, Ni: 0.8˜6%, and Ni:Cu≥0.4, C: 0˜0.2%, Mo: 0˜3%, W: 0˜3%, Nb: 0˜0.2%, Mn: 0˜0.8%, Cr: 0˜1%, the balance of Fe and other alloying elements and impurities. The present invention also discloses a heat treatment method for performing on the hot-working die steel. The present invention further discloses a hot-working die formed of the hot-working die steel underwent through heat treatment according to the heat treatment method.

Hot-working die steel, heat treatment method thereof and hot-working die

Pre-coated steel sheet with aluminum or aluminum alloy pre-coating, manufacturing method and hot stamped components, where the method for manufacturing a pre-coated steel sheet with aluminum or aluminum alloy pre-coating relates to the situation of 0.10%≤C≤0.30%, the dew point of the mixed atmosphere is controlled in the range of −40˜−15° C. and, where it relates to the situation of 0.30%<C≤0.50%, the dew point of the mixed atmosphere is controlled in the range of −36˜−12° C. A pre-coated steel sheet with aluminum or aluminum alloy pre-coating is obtained by the method and hot stamping components are obtained by the pre-coated steel sheet. The improved toughness and VDA peak force are achieved for the hot stamping components and then the collision safety of hot stamping components is elevated.

Pre-coated steel sheet with aluminum or aluminum alloy pre-coating, manufacturing method and hot stamped components

Coated steel sheet used for hot stamping has a thin aluminium alloy coating with coating thickness of 5˜14 μm. The aluminium alloy coating has a FeAlSi inhibitive layer adjacent to a substrate steel sheet and an Al alloy layer outside the FeAlSi inhibitive layer. The thickness of the FeAlSi inhibitive layer is no more than 60% of the coating thickness and is 1.5˜6.0 μm. Diameters of Kirkendall voids within 2 μm from an interface between the FeAlSi inhibitive layer and the substrate steel to the interior of the substrate steel are no more than 2.5 μm, and the number of Kirkendall voids with a diameter of no less than 0.5 μm and no more than 2.5 μm does not exceed 15 per 35 μm. The coating method eliminates skip coating and resulting hot stamped component has excellent resistance spot welding performance.

Coated steel sheet with thin aluminium alloy coating and coating method thereof

Steel for hot stamping, a hot stamping process and a hot stamped component, in which the steel for hot stamping contains in weight percentage C: 0.2-0.4%, Si: 0-0.8%, Al: 0-1.0%, B: 0-0.005%, Mn: 0.5-3.0%, Mo: 0-1%, Cr: 0-2%, Ni: 0-5%, V: 0-0.4%, Nb: 0-0.2%, Ti: ≤0.01%, and impurity elements such as P, S, N unavoidable during smelting. The relationship*Mo+16*Mn+14*Cr+5.3*Ni≥30% is satisfied when B≤0.0005%, and 0.4-1.0% Al is contained when 0.0005%<B≤0.005%.

Steel for hot stamping, hot stamping process and hot stamped component

Provided in the present disclosure is a method of heat treating a high-strength steel, wherein the high-strength steel comprises, by weight: 0.30-0.45% C, 1.0% or less Si, 0.20-2.5% Mn, 0.20-2.0% Cr, 0.15-0.50% Mo, 0.10-0.40% V, 0.2% or less Ti, 0.2% or less Nb, and a balance of Fe and other alloy elements and impurities, wherein the above alloy elements make Eq(Mn) according to the following formula (1) no less than 1.82, which method comprises the steps of 1) austenitizing; 2) carbide precipitation; and 3) tempering. The heat-treated steel in accordance with the present invention has high strength, high ductility and high toughness at the same time, especially improved reduction in area of tensile sample, so that it is particularly suitable for preparing spring members for vehicle suspension.Eq(Mn)=Mn+0.26Si+3.50P+1.30Cr+2.67Mo  (1)

Method of heat treating a high strength steel and a product obtained therefrom

The present invention relates to a hot stamped component, a precoated steel sheet used for hot stamping, and a hot stamping process. The hot stamped component of the present invention is provided with a coating of aluminium or an aluminium alloy on at least one surface of the base steel, the coating is produced by interdiffusion between the base steel and a precoating of aluminium or aluminium alloy, and the coating has a thickness of 6 to 26 &#x3bc;m.

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Jiangsu, China

Xiaochuan Xiong