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Title:
PRODUCTION OF LARGE DIAMETER RING OF AUSTENITIC AND FERRITIC STAINLESS STEEL
Document Type and Number:
Japanese Patent JPH10277692
Kind Code:
A
Abstract:

To produce a large size ring high in dimentional precision by applying heat treatment to a ring in which a groove is to be formed on inner/outer diameter faces in the peripheral direction by cold rolling a steel tube extruded by a medium press machine as a base material, and then sizing, shot-peening and pickling the ring.

An austenitic stainless steel, e.g. SUS304 extruded by a medium press machine of 2000t is cut to a ring by a band saw, etc. This ring is subjected to cold rolling at an expanding rate of 1.2-1.8. After heating to about 1070°C, the ring is subjected to rapid cooling solid solution heat treatment, after a roundness/external dimension is made by sizing, shot blasting is conducted to remove a scale generated by heat treatment. By this method, without using a large press machine and a cold drawing machine difficult to contact a small quantity and many kind production in high cost, a large diameter ring having an outer diameter of ≥145 mm is obtained in high precision.


Inventors:
NASU RYUJI
NAGAI MASAYA
Application Number:
JP1997000102770
Publication Date:
October 20, 1998
Filing Date:
April 03, 1997
Export Citation:
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Assignee:
SANYO SPECIAL STEEL CO LTD
International Classes:
B21C23/08; B21D41/02; B21H1/06; B21K21/06; C22C38/00; (IPC1-7): B21K21/06; B21C23/08; B21D41/02; B21H1/06
Attorney, Agent or Firm:
横井 健至