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发明公开
CN110453134A 一种高强韧性机车钩尾框用钢及其制备方法 无效 - 驳回

一种高强韧性机车钩尾框用钢及其制备方法
摘要：
本发明公开了一种高强韧性机车钩尾框用钢及其制备方法，所述钩尾框用钢的化学组成按照重量百分比为：C：0.24～0.28％、Si：0.20～0.40％、Mn：1.20～1.50％、P：≤0.025％、S：≤0.025％、Cr：0.40％～0.60％、Mo：0.20～0.30％、Ni：0.35～0.55％、Cu：≤0.20％、Ti：0.02～0.10％、Nb：0.02～0.05％、Al≤0.040％、As：≤0.020％、Sn：≤0.020％、Pb：≤0.0025％、Sb：≤0.025％、Bi：≤0.005％、[O]≤15ppm、[N]≤90ppm、[H]≤1.5ppm，其余为Fe和不可避免的杂质。其制备方法包括：1)冶炼；2)精炼；3)浇注；4)轧制。本发明制得的钩尾框钢的强度和塑性、低温韧性指标均大幅提高，钢的无塑性转变温度≤-56℃。
摘要（英）：

The invention discloses high-strength-and-toughness steel for a locomotive coupler yoke and a preparation method thereof. The steel for the coupler yoke comprises the following chemical components including, by weight, 0.24%-0.28% of C, 0.20%-0.40% of Si, 1.20%-1.50% of Mn, smaller than or equal to 0.025% of P, smaller than or equal to 0.025% of S, 0.40%-0.60% of Cr, 0.20%-0.30% of Mo, 0.35%-0.55%of Ni, smaller than or equal to 0.20% of Cu, 0.02%-0.10% of Ti, 0.02%-0.05% of Nb, smaller than or equal to 0.040% of Al, smaller than or equal to 0.020% of As, smaller than or equal to 0.020% of Sn,smaller than or equal to 0.0025% of Pb, smaller than or equal to 0.025% of Sb, smaller than or equal to 0.005% of Bi, smaller than or equal to 15 ppm of [O], smaller than or equal to 90 ppm of [N], smaller than or equal to 1.5 ppm of [H], and the balance Fe and unavoidable impurities. The preparation method comprises the following steps of (1) smelting; (2) refining; (3) pouring; and (4) rolling.The strength, plasticity and low-temperature toughness indexes of the prepared steel for the coupler yoke are greatly improved, and the non-plastic transition temperature of the steel is smaller thanor equal to -56 DEG C.

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