论文部分内容阅读
500m钻机钻杆接头采用45钢铸造件。其生产工艺为铸造-退火(840±1O℃2h,炉冷至500℃空冷) -机加工-调质(840±10℃20min水冷,回火560±10℃20min水冷)。生产出的钻杆接头有多条长短不同的裂纹。一、金相检验 1.非金属夹杂物:以硫化物为主,其形态为小块状,均匀分散分布。
500m drill pipe joints using 45 steel castings. The production process is casting-annealing (840 ± 1O ℃ 2h, furnace cooling to 500 ℃ air cooling) -processing-quenching (840 ± 10 ℃ water cooling for 20min, tempering 560 ± 10 ℃ water cooling for 20min). Production of the drill pipe joints have a number of different length of the crack. First, metallographic examination 1. Non-metallic inclusions: Sulfide-based, its shape is small, evenly distributed.