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原子力プラント用高強度Mn-Ni-Mo鋼SQV 2Bの材質特性

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.18 (1986) No.4

原子力プラント用高強度Mn-Ni-Mo 鋼 SQV 2B の材質特性

Mechanical Properties of High-Strength Mn-Ni-Mo Steel for Nuclear Power Plant

吉村 茂彦(Shigehiko Yoshimura) 西崎 宏(Hiroshi Nishizaki) 杉江 英司(Eiji Sugie) 久保 高宏(Takahiro Kubo) 佐藤 正信(Masanobu Sato)

要旨 : 1150 MW 級の加圧水型(PWR)原子力発電プラントの蒸気発生器用鋼板を想定して,高強度 鋼板であるSQV 2B(TS(63 kgf/mm2)の板厚 100 mm 鋼板を製造し,その特性を調べた。鋼 はP,S,AS,Sb などの不純物を低下した結果,板内の成分偏析は少なく,機械的性質の 差も小さい。母材とSAW,MIG 溶接継手の常温および高温強度さらに衝撃特性は規格値を 満足し,RTNDT も-45℃と良好である。母材および溶接継手 HAZ 部の静的および動的破 壊靭性値,き裂伝ぱ停止破壊靭性値はいずれも通産省告示501 号(昭和 55 年)の KIR 曲線 を上まわっている。以上の結果より,この鋼板は原子力プラント機器用として十分な材質特 性をもっていることが確認された。 Synopsis :

High strength JIS SQV 2B 100 mm thick plate for the steam generator of a 1150 MW class pressurized water reactor type plant is manufactured and its characteristics are examined. Because of the reduction of impurities such as P, S, As and Sb in steel, the segregation of the elements and variations of mechanical properties in the whole plate are minimized. The yield and tensile strengths at ambient and high temperatures and impact properties of base material and welded joints by SAW and MIG fulfill the specifications. Furthermore those RTNDT's are lower than -45 ℃ . The static and dynamic fracture toughness and the crack arrest fracture toughness are higher than those of KIR curve specified by MITI No.501. From these results, it is concluded that this material has sufficient safety for this purpose.

(c)JFE Steel Corporation, 2003

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