Reduced preheating type 1.25% Cr - 0.5% Mo steel plates

1. Features

  • 400 N/mm2 class chromium-molybdenum alloy steel plates for boilers and pressure vessels for contributing to the reduction of welding costs and the improvement of the welding work environment during construction.
    • Preheating in welding construction can be greatly reduced.

2. Major corresponding standards

  • JIS G4109 (Chromium-molybdenum Alloy Steel Plates for Boilers and Pressure Vessels)
    SCMV3-1

3. Applications

  • The application of steel plates for various boilers and pressure vessels can be expected.

4. Typical characteristics

Classification Thickness
mm		 Main chemical composition mass % Pcm2）
%		 Base metal properties Weldability3）
C Si Mn Cr Mo Other
elements		 SR
treatment		 0.2%YS
N/mm2		 TS
N/mm2		 Prevention of weld cracking
Preheating temperature (°C) for preventing weld cracking		 SR cracking ratio
%
Developed steel plate2） 50 0.07 0.64 0.54 1.26 0.48 Ni、Nb 0.22 690°C
x 8h		 293 472 50 0
Conventional steel plate 50 0.12 0.64 0.57 1.32 0.51 - 0.27 325 495 125 0
Specification value1） 50 ≦0.17 0.50
to 0.80		 0.40
to 0.65		 1.00
to 1.50		 0.45
to 0.65		 - - - ≧235 410
to 590		 - -
1) JIS G4109 SCMV3-1
2) Pcm（％）=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B
3) JIS Z3158 Method of y-groove weld cracking test (the SR cracking ratio is measured after SR treatment at 690°C x 8 h)

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