| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of an endless metal belt which can achieve the solution heat treatment of a drum after the welding and the solution heat treatment of a ring after the rolling under the same condition, and reduce the manufacturing cost. SOLUTION: The cylindrical drum 2 is formed by welding ends of a maraging steel sheet 1. The first solution heat treatment is achieved to the welded drum 2. The solution heat treatment drum 2 is cut to a predetermined width to form the rings 4, and the rings 4 are rolled. The second solution heat treatment is achieved to the rolled rings 4. The solution heat treatment rings 4 are corrected to a predetermined circumferential length, and then, subjected to the age-hardening and the nitriding. A plurality of the aged and nitrided rings 4 are laminated on each other to form the endless metal belt. The first solution heat treatment to the welded drum 2 and the second solution heat treatment to the rolled rings 4 are achieved in the nitrogen atmosphere containing 1-10% hydrogen and of the atmospheric dew point of -7 to 0 deg.C, and in the temperature range of not lower than the recrystallization point of the maraging steel and not higher than 850 deg.C.
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