PTA锻焊反应器的制造

本文对PTA装置上的大型铬钼钢锻焊反应器，在制造过程中的几个关键技术进行了介绍：控制材料的化学成分提高铬钼钢材料的抗回火脆化能力；采用先进的冶炼工艺和锻造技术保证大型锻件的质量；优化铬钼钢封头正火热处理中的冷却工艺来保证材料的性能指标；采用合理的焊接工艺，既保证了厚壁环焊缝的焊接质量，又降低了制造成本；优化堆焊工艺，保证了反应器内壁的堆焊质量；正确选择热处理规范，对铬钼钢压力容器至关重要。

Fabrication of Forge Welding PTA Reactor

The article introduces several key techniques for fabrication of large Cr-Mo steel forge welding reactor in PTA unit. The chemical composition of material should be controlled to improve the anti- tempered embrittlement ability for Cr-Mo steel; the advanced smelting process and forging technique should be used to assure the large forging quality; the cooling process of normalization for Cr-Mo steel head should be optimized to assure the material property; the reasonable welding process should be used to assure the welding quality of thick wall circumferential seam and reduce the fabrication cost; the overlay welding process should be optimized to assure the overlay welding quality in inner surface of reactor. Finally, it is very important for the Cr- Mo steel pressure vessel to use the proper heat treatment procedure.