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SteelPlatesof460MPaYieldStrengthClasswithJFEEWEL
JFE EWEL?
JFE No. 18 2007 11 p. 13–17
YP460
Steel Plates of 460 MPa Yield Strength Class with JFE EWEL? Technology for Large Heat Input Welding
ICHIMIYA Katsuyuki SUMI Hiroyuki HIRAI Tatsushi
JFE JFE JFE
JFE EWEL
JFE EWEL? CGHAZ
TiN
constituent
C Si Nb
Super-OLAC? OLAC On-Line Accelerated Cooling
mechanical control process
HAZ
YP460 MPa B Ca
M-A martensite-austenite
TMCP thermo2007 5
Abstract:
The “JFE EWEL?” technology for improving the toughness of heat affected zone (HAZ) effected by large heat input welding has been applied to make YP460 MPa class steel plates for very large container carriers. The “JFE EWEL” technology consists of minimizing the coarse grain HAZ region through controlling TiN particles, re?ning the microstructure of HAZ by using B, Ca and improving the toughness of matrix. Furthermore, the reduction of C, Si, Nb contents improves HAZ toughness with decreasing martensite-austenite constituents. Production of this steel plate was made possible by Super-OLAC? (OLAC: On-Line Accelerated Cooling) and state-of-the-art thermomechanical control process. The developed steel has been approved by Nippon Kaiji Kyokai as rolled steel for hull, and is under the application to actual ship.
YP460 MPa
1.
1,2
20
65 mm 80 mm
EGW: electrogas arc welding
10 000 TEU twenty-feet equivalent unit:
HAZ: heat affected zone
YP390 MPa
YP460 MPa
HAZ
JFE EWEL? 3,4
JFE YP460 MPa
2007 9 10
YP460 MPa
13
1 Table 1 Target values in mechanical properties and Ceq for developed steel plate
Steel plate
Welded joint
Grade
Thickness (mm)
Tensile properties*1
YS (MPa)
TS (MPa) El (%)
Charpy impact properties*2
vE-40
Ceq*3 (%)
Tensile properties*2 TS (MPa)*4
Charpy impact properties
vE?20 (J)
YP460
60
м460
570–720
*5
*5
?0.42
м570
*5
EH40 50 ? t ? 70
м390
510–650 м20
м46
?0.40
м510
м41
*1T.P.: T-direction *2T.P.: L-direction *3Ceq?C?Mn/6?(Cr?Mo?V)/5?(Cu?Ni)/15 *4T.P.: NK U2A *5Equivalent to EH40 YS: Yield strength TS: Tensile strength El: Elongation vE: Absorbed energy
2.
YP460 MPa
EGW E
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