水电机组容量的不断增加,是目前国内外电机制造业的一大特点,也是发展的必然趋势。这样,机组的结构尺寸就会越来越大,乃至远远超出铸造能力,给生产和运输带来许多困难。针对上述问题,近年来,我国大型水轮发电机组的主要部件以焊代铸的趋势逐渐明显。在保证机组结构强度和刚度的前提下,应尽量减轻零部件重量,降低成本和材料消耗。在大电机制造业中,国外已大量采用σ_s≥50公斤/毫米~2级低合金高强度钢。六十年代,我国冶金部门就着手研制14MnMoVN新钢种。经不断研究、试验、改进、完善,终于研制成功 The increasing capacity of hydropower units is a major feature of the motor manufacturing industry at home and abroad, but also an inevitable trend of development. In this way, the size of the unit will be bigger and bigger, and even far beyond the casting capacity, to produce and transport many difficulties. In response to the above problems, in recent years, the major components of large hydro-generating units in China gradually become apparent by welding. Under the premise of ensuring the structural strength and rigidity of the unit, the weight of parts and components should be reduced as much as possible to reduce the cost and material consumption. In the large motor manufacturing industry, a large number of foreign countries have adopted σ_s ≥ 50 kg / mm ~ 2 low-alloy high-strength steel. In the 1960s, China’s metallurgical department embarked on the development of new 14MnMoVN steel grades. After continuous research, testing, improvement, improvement, and finally successfully developed