通过对30Cr Mn Si Ni2A钢螺栓的感应回火处理要求进行分析,提出螺栓螺纹感应回火方案,对比分析不同感应加热方式对螺栓回火区、热影响区硬度的分布,确定最佳的30Cr Mn Si Ni2A钢螺栓螺纹感应回火工艺,使螺栓的感应回火技术指标满足要求...通过对30Cr Mn Si Ni2A钢螺栓的感应回火处理要求进行分析,提出螺栓螺纹感应回火方案,对比分析不同感应加热方式对螺栓回火区、热影响区硬度的分布,确定最佳的30Cr Mn Si Ni2A钢螺栓螺纹感应回火工艺,使螺栓的感应回火技术指标满足要求,最终通过重复性试验验证,进行硬度、金相检测,完成对30CrMnSiNi2A钢螺栓螺纹感应回火工艺的研究。展开更多
In our lives, we may make many kinds of friends. But do you know who is your very close and trusted friend? Maybe you do not know, but s/he always comes to help you when you are in trouble. S/He will do the utmost[最...In our lives, we may make many kinds of friends. But do you know who is your very close and trusted friend? Maybe you do not know, but s/he always comes to help you when you are in trouble. S/He will do the utmost[最大能力] to help you and will never tell you. The coming of the dark always makes me展开更多
One of the most important things in every teenager's life is a friend.So this month in “Teen Life” we thought it would be good to reflect on what friendship means.We have brought you three people's stories o...One of the most important things in every teenager's life is a friend.So this month in “Teen Life” we thought it would be good to reflect on what friendship means.We have brought you three people's stories of friendship about展开更多
文摘通过对30Cr Mn Si Ni2A钢螺栓的感应回火处理要求进行分析,提出螺栓螺纹感应回火方案,对比分析不同感应加热方式对螺栓回火区、热影响区硬度的分布,确定最佳的30Cr Mn Si Ni2A钢螺栓螺纹感应回火工艺,使螺栓的感应回火技术指标满足要求,最终通过重复性试验验证,进行硬度、金相检测,完成对30CrMnSiNi2A钢螺栓螺纹感应回火工艺的研究。
文摘In our lives, we may make many kinds of friends. But do you know who is your very close and trusted friend? Maybe you do not know, but s/he always comes to help you when you are in trouble. S/He will do the utmost[最大能力] to help you and will never tell you. The coming of the dark always makes me
文摘One of the most important things in every teenager's life is a friend.So this month in “Teen Life” we thought it would be good to reflect on what friendship means.We have brought you three people's stories of friendship about