译文：
阀杆螺母是阀门驱动装置的重要零件之一。阀门工作时，手轮或电动装置带动安装在支架箱内的阀杆螺母旋转，阀杆螺母将手轮或电动装置的运动和启闭力矩传递到阀杆，阀杆升降阀门密封元件（闸板、阀瓣、柱塞、膜片等），实现阀门的启闭和密封。 铝合金阀杆螺母具有优良的机械性能和铸造性能，成品率高，比重小，仅为铜比重的1/3左右，价格也为铜的1/3左右，具有较高的比强度（强度/比重）和xxx。我校研制的新型的变形铝合金，是通过冲压、弯曲、轧、挤压等工艺使其组织、形状发生变化后晶粒得到了细化的铝合金，其强度、硬度以及抗压性、抗拉性都有很大的提高，尤其在表面工艺处理上，使用了镀层、拉丝等工艺，加强了表面的硬度，耐划耐刮。变形铝合金阀杆螺母的材料应具有一定的强度、韧性和硬度，较低的摩擦系数，良好的耐蚀性和一定的耐热性。适用于手轮和电动闸阀、截止阀、隔膜阀和柱塞阀等的阀杆螺母，还可广泛应用于轴套、轴瓦、蜗轮齿冠及其它耐磨件的制造上，作为日渐匮乏的铜合金材料的的替代产品，具有很高的经济效益和社会效益。 新型的变形铝合金的材料力学性能，使其制造的阀杆螺母在常温时的材料抗拉强度σb达到550Mpa，延伸率δ为12%，表面硬度值应为HB≥150，满足阀杆螺母的使用要求。新型的变形铝合金与阀杆主要材料的马氏体不锈钢、奥氏体不锈钢等摩擦性能，干摩擦系数小于0.35。

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原文：
The valve stem nut is one of the drives of the important parts. Valve job, hand-driven wheel or electrical device installed in the bracket inside the stem nut rotation, stem nut hand wheel or electrical device to the movement and hoisting torque delivered to the stem, lifting the valve stem sealing element ( gate, flap valve, plunger, diaphragm, etc.), to achieve the valve open and close and seal. Aluminum alloy stem nut with excellent mechanical properties and casting performance, yield a high proportion of small, the proportion of copper is only 1 / 3 the price for copper in 1 / 3 with high specific strength (strength / weight), and cost-effective. Our school developed a new type of deformation of aluminum alloy is produced by stamping, bending, rolling, extrusion and other processes to bring the organization, the shape change after the grain has been refined aluminum alloy, its strength, hardness and resistance to stress, anti - La nature has greatly improved, especially in the surface treatment process, using a coating, drawing and other techniques to enhance the surface hardness, scratch resistance to draw. Deformation of aluminum alloy stem nut material should have a certain degree of strength, toughness and hardness, low friction coefficient, good corrosion resistance and a certain degree of heat resistance. Apply to hand-wheel and electric valve, globe valve, diaphragm and plunger valve stem nut, etc., but also widely used in bushings, bearings, worm gear crown and other wear-resistant parts manufacturing as an increasingly scarce copper alloy materials, alternative products, with high economic and social benefits. The new deformation mechanical properties of aluminum alloy material to manufacture the stem nut when the materials at room temperature tensile strength of σb to 550Mpa, elongation δ of 12%, the surface hardness value should be HB ≥ 150, to meet the stem nut use requirements. The new deformed aluminum alloy and martensitic stainless steel stem the main materials, austenitic stainless steel friction performance, dry friction coefficient is less than 0.35.