论文部分内容阅读
一台尿素生产用的配套高压设备——液氨预热器。设备管程工作压力为220公斤力/厘米~2,壳程工作压力为13公斤力/厘米~2;工作温度管程为120～180℃,壳程为191℃;工作介质管程为液氨,壳程为蒸汽;壳体材料为8毫米的16MnR普通低合金容器用钢,列管为φ25×5毫米的高压无缝钢管,管板、管箱材料为20MnMo调质锻钢。焊接结构如图所示。 1.焊接工艺试验根据JB755—73锻件标准,20MnMo锻钢与16MnR焊接是没有问题的,因此在工艺试验中没有采取更多的工艺措施。 20MnMo粗加工胚料为50毫米,加工成14毫米。然后把16MnR加工成小铁研试样(Y型),试验的焊接电流150～170安,焊接速度150毫米/分,装配间隙2毫米,采用
A urea supporting the production of high-pressure equipment - liquid ammonia preheater. Working pressure of equipment pipe is 220 kg / cm ~ 2, working pressure of shell side is 13 kgf / cm ~ 2; working temperature pipe is 120 ~ 180 ℃, shell side is 191 ℃; working medium pipe is liquid ammonia , The shell side is steam; shell material is 8mm 16MnR ordinary low alloy container steel, tube is φ25 × 5mm high pressure seamless steel tube, tube plate, tube box material is 20MnMo quenched and tempered steel. Welding structure as shown. 1. Welding process test According to JB755-73 forgings standard, 20MnMo forged steel and 16MnR welding is no problem, so no more technical measures in the process of testing. The 20MnMo roughing blank is 50 mm and is processed to 14 mm. The 16MnR was then machined into a small iron-iron test specimen (Y-type) with a test current of 150-170 A, a welding speed of 150 mm / min and an assembly gap of 2 mm,