KOBELCOの3つの約束

予熱軽減・大入熱溶接型耐候性鋼

特色と効果

表1 開発鋼の特性の一例 (SMA490W) Examples of properties of developed steel

Steels Chemical Composition mass % Ceq1) P cm2) Measure for Large Heat
Input Welding
C Si Mn Cu Cr Ni
Developed Steel 0.09 0.30 0.96 0.33 0.52 0.21 0.37 0.19 Ti Treatment
Conventional Steel 0.12 0.30 1.10 0.36 0.50 0.19 0.42 0.23

1) Ceq(%)=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14

2) Pcm(%)=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B

Steels Plate
Thickness
mm
Mechanical Properties
YP
N/mm2
TS
N/mm2
vE0
J
Developed
Steel
22 423 531 342
50 424 528 337
Conventional
Steel
22 387 512 359
50 425 520 312
Steels Plate
Thickness
mm
Weldability 3) Mechanical Properties of Welded Joints
Preheat
Temperature
Welding
Method
Heat
Input
kJ/mm
Tensile
Strength
Charpy V-notch
Impact properties
TS
N/mm2
Notch
Location
vE0
J
Developed
Steel
22 No Crack at
25°C
Electro
Gas Arc
14.3 534 HAZ1mm 114
50 No Crack at
25°C
CO2
Gas Arc
3.3 578 HAZ1mm 282
Conventional
Steel
22 No Crack at
25°C
Electro
Gas Arc
14.6 528 HAZ1mm 51
50 No Crack at
25°C

3) y-groove weld cracking test

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