RESEARCH ON MANUFACTURE PROCESS FOR LARGE-SIZED HEAVY-WALL 0Cr18Ni9Ti STEEL ELBOW

Expanding/push-thending formation is the hardnut in forming process of seamless steel elbow with large-sized, heavy-walled stainless steel tube as blank. Based on the expanding/push-bending formation of the elbow with the φ4O6.4mm×32mm-R610mm, heavy-walled 0Cr18Ni9Ti steel tube as blank, calibration of the mandrel strength was made, and proper material of the mandrel and processing method were proposed. The mandrel profile, temperature distribution as well as clerance of the induction coil were also determined. Relevand operation practice has proven the effecativeness of all the said research results.