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铬钼(Cr-Mo)钢板已经广泛地应用于化工厂的压力容器,在高温高压的氢气工况下工作。近来,由于这些化工厂生产规模的扩大,Cr-Mo钢板的厚度也逐渐增加,同时超厚Cr-Mo钢板的机械性能却趋于下降。为了解决这些问题,我们研制了即使在厚板中也具有足够机械性能的经铝-硼(Al-B)处理的Cr-Mo钢板。过去没有弄清楚Al-B处理对抗氢腐蚀性的影响。因此,专就Al-B处理对抗氢腐蚀的影响进行了研究。此外,据说加入钛能提高含硼钢的淬硬性,同加入铝时由于形成氮化物所起的作用一样。所以,也进行了为弄清钛-硼(Ti-B)处理对抗氢腐蚀性和机械性能影响的研究。对于含硼Cr-Mo钢(B=10ppm)的摸拟热影响区,抗氢腐蚀性随溶解铝成份超过0.01%而有所提高。加入钛同加入铝一样,也能提高硼钢的抗氢腐蚀性。但过多的钛会提高抗拉强度和硬度,并且明显地降低热影响区的韧性。从抗氢腐蚀和机械性能来看,C_1-Mo钢经Al-B处理优于经Ti-B处理。因此,经Al-B处理的Cr-Mo钢板要比普通的Cr-Mo钢板具有更好的机械性能和抗氢腐蚀性能。
Chromium molybdenum (Cr-Mo) steel has been widely used in chemical plant pressure vessels, working under high temperature and pressure of hydrogen. Recently, the thickness of Cr-Mo steel sheets has also gradually increased due to the expansion of the production scale of these chemical plants, while the mechanical properties of the super-thick Cr-Mo steel sheets have tended to decrease. To solve these problems, we developed a Cr-Mo steel plate treated with aluminum-boron (Al-B) even though it has sufficient mechanical properties in a slab. The impact of Al-B treatment on hydrogen corrosion has not been clarified in the past. Therefore, the impact of Al-B treatment on hydrogen corrosion has been studied. In addition, it is said that the addition of titanium increases the hardenability of the boron-containing steel in the same way as the formation of nitrides when aluminum is added. Therefore, studies have also been conducted to understand the effects of Ti-B treatment on hydrogen corrosion resistance and mechanical properties. For the simulated heat-affected zone of boron-containing Cr-Mo steels (B = 10 ppm), the hydrogen corrosion resistance increases with the dissolved aluminum content by more than 0.01%. Adding titanium, like adding aluminum, also improves the resistance to hydrogen corrosion of boron steel. But too much titanium will increase the tensile strength and hardness, and significantly reduce the toughness of the heat affected zone. In terms of hydrogen corrosion resistance and mechanical properties, C 1-Mo steel is better treated with Al-B than with Ti-B. Therefore, the Al-B-treated Cr-Mo steel has better mechanical properties and hydrogen corrosion resistance than ordinary Cr-Mo steel.