BÖHLER C 9 MVW-IG伯乐焊丝

BÖHLER C 9 MVW-IG伯乐焊丝

Description
GTAW-rod for high temperature, creep resistant martensitic 9 % chromium steels, especially
designed for the steel P 911 according to ASTM A335. Approved in long-term condition up to
+650 °C service temperature. Preheating and interpass temperature 200-300 °C. After welding
the joint should be cooled down below 80°C to finish the martensite transformation. In case of
greater wall thickness or complex components the possibility of residual stresses must be con-
sidered. The following post weld heat treatment is recommended: annealing 760 °C/ min. 2 hrs,
max. 10 hrs, heating and cooling rates below 550 °C max. 150 °C/h, above 550 °C max. 80 °C/hr.
For optimised toughness values a welding technology should be applied which produces thin
welding layers (app. 2 mm).
Approvals and Certificates
TÜV-D (9177.), UDT
Same Alloy Filler metals
SMAW stick electrode: FOX C 9 MVW
base Materials
similar alloyed creep resistant steels
1.4905 X11CrMoWVNb9-1-1,
ASTM A335 Gr. P911, A213 Gr. T911
Operating Data
Shielding gas:  ø mm
100 % Argon 2.0
front: E 911 2.4
back: –
Mechanical Properties of All-weld metal
(*) a
yield strength R e N/mm 2 : 660 (≥ 560)
tensile strength R m N/mm 2 : 790 (≥ 720)
elongation A (L 0 =5d 0 ) %: 16 (≥ 15)
impact work ISO-V KV J +20 °C: 50 (≥ 41)
(*) a annealed 760 °C/2 h/furnace down to 300 °C/air – shielding gas 100 % Argon
Typical Composition of Welding Rod
C Si Mn Cr Ni Mo V Nb W N
wt-%  0.11 0.35 0.45 9.0 0.75 0.98 0.2 0.06 1.05 0.04