20钢无缝感应加热弯管研究
Study on Induction Heating Bend Pipe of 20 Seamless Steel
池 强, 刘迎来, 王 鹏, 张伟卫
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作者单位：(中国石油天然气集团公司 管材研究所, 陕西 西安 710065)
中文关键字：弯管； 淬火； 正火； 力学性能
英文关键字：bend pipe; quenching; normalizing; mechanical property
中文摘要：对Ø325 mm × 8 mm的20钢无缝钢管分别进行860、940 ℃的感应淬火和940 ℃感应淬火+900 ℃正火，并对不同工艺加工的弯管进行性能研究。结果显示，随感应淬火温度的升高，弯管的强度、硬度升高，韧性降低，淬火态弯管整体性能不均匀。经正火处理的弯管，与淬火态的相比，强度和硬度降低，韧性升高，弯管整体性能趋于一致，其组织和力学性能与20钢管接近。
英文摘要：Based on Ø325 mm × 8 mm 20 seamless steel pipe, adopting the processes of induction quenching(860 ℃, 940 ℃) & induction quenching 940 ℃+normalizing at 900 ℃, the induction heating bend pipes were manufactured and studied. The results show that the strength and hardness increase, but the toughness decrease with the increase of quenching temperature. The integral mechanical properties of bend pipe as-quenched are not uniform. Through the normalizing for the bend pipe as-quenched, the strength and hardness decrease, the toughness increases compared with as-quenched. The integral mechanical properties of bend pipe as-normalized drive to uniformity. The microstructure and mechanical properties of bend pipe as-normalized are close to those of original 20 steel pipe.