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中・常温圧力容器用高強度鋼鋼板および鍛鋼品の特性

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.13 (1981) No.3

中・常温圧力容器用高強度鋼鋼板および鍛鋼品の特性

Characteristics of High Strength Steel Plates and Forgings for Pressure Vessels Served at Intermediate and Moderate Temperatures

飯田 義治(Yoshiharu Iida) 江本 寛治(Kanji Emoto) 楠原 祐司(Yuji Kusuhara) 和 中 宏 樹(Hiroshige Wanaka) 朝 生 一 夫 (Kazuo Aso) 吉 村 茂 彦 (Shigehiko Yoshimura)

要旨 :

350 ℃ で Y.S.25kgf/mm**2 を 保 証 す る 厚 板 150mm の 鋼 板 (PMS25), 350 ℃ で Y.S.25kgf/mm**2 を保証する肉厚 150mm, 300mm の鍛鋼品(PMSF25)および 350℃で でY.S.35kgf/mm**2 を保証する肉厚 150mm, 300mm の鍛銅品(PMSF35)を製造した。 PM25 は,Cu, Ni, Nb を添加した鋼材である。熱処理は Normalizing-Tempering 処理を採 用した。一方PMSF25,PMSF35 は C-Mn-Ni-Cr-Mo-V 系であり,グレードに応じて添加 量をコントロールした。熱処理はいずれもQuenching-Tempering 処理を採用した。得られ た結果は,強度,じん性,溶接性ともすぐれたものであり,日本溶接協会が規定する各規 格を十分満足するものである。

Synopsis :

Three types of steel plate and forgings for pressure vessels use at intermediate and moderate temperatures have been newly manufactured at Mizushima Works: a 150mm thick plate with yield strength (Y.S.) over 25 kgf/mm**2 (PMS 25), 150mm and 300mm thick forgings with Y.S. over 25 kgf/mm**2 (PMSF 25), and 150mm and 300mm thick forgings with Y.S. over 35 kgf/mm**2 (PMSF 35), all serviceable at 350℃. PMS 25 whose chemical composition is mainly of C, Mn, Mo and V, containing small amounts of Cu, Ni and Nb, is normalized and tempered for heat treatment. On the other hand, PMSF25 and PMSF 35 have mainly C, Mn, Cr, Mo and V, with composition controlled according to a given grade specification. These are quenched and tempered for heat treatment. Test results show that all these materials shown above have superior strength, toughness, and weldability, especially at 350℃, and meet requirements specified by Japan Welding Society.

(c)JFE Steel Corporation, 2003

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