Bainite control technology: ultra-low carbon bainite on cooling rate of the phase transition is not sensitive to cooling rate in the larger context of the organization are the axis of the steel-like Bayesian ferrite (bainiticferrite) , the hardness after welding HAZ little change. When the cooling rate
To 25 ℃ / s (equivalent to 20kJ/mm) were still very high toughness, which can produce high strength steel thicker than 75mm. Using this technology, KASAKI company produced the TS570MPa 38 ~ 75mm thick steel plate, arc welding conditions in the largest hard HAZ
Degree of 280HV. The line energy in 20kJ/mm despite high Charpy impact energy.
TPCP (themo-mechanicalprecipitationcontrolprocess) technology: thermal deformation can be obtained after the cooling rate is not sensitive to the uniformity of organization. Will be reduced to 0.02% C content in austenite - ferrite phase transformation process does not produce a redistribution of C,
Also add other alloying elements in a wide range of cooling rate to obtain uniform ultra-low carbon bainite. The key is to precipitate the process control technology to maintain strength through the precipitation strengthening effect. Japan's use of the technology developed ultra-low carbon bainitic steel with high toughness
emergency mobile charger
.
EWEL Technology: Japan's EWEL technology is the austenite grain refinement techniques, the microstructure of austenite grain control technology, chemical composition design and production process and through the weld metal in the B diffusion heat affected zone four methods of synthesis. Which
, The microstructure of austenite grain control is by reducing Ceq the UB organization into F + B or F + P organization. In addition, γ! Α phase transition process, you can also intragranular ferrite and Ca in the BN non-metallic inclusions on heterogeneous nucleation and thin
Of grain within the organization. BN to improve the toughness of the base metal is very favorable. JFE companies use sulfide shape control technology (ACR, atomicconcentrationratio) to achieve control of the morphology of inclusions, significantly improve the toughness of heat affected zone.
Large heat development and application of welding steel
Steel line by improving the energy technologies of welding, the current foreign countries represented in Japan have developed a lot of energy for large welded steel wire, the organization mainly of ferrite and low carbon bainite. Wuhan Iron and developed country
WGJ510C2 and WDL610D2 steel, has better performance of large heat input welding, and applied for a patent.
In addition, the Wuhan Iron and Steel has also developed a large heat input welding liquid zinc corrosion resistance of high toughness steel. The steel to Nb, V and other micro-alloying elements to improve the strength of steel, composite oxides obtained by Ti ≥ 50kJ/cm the Kang Da heat input welding performance.
Shipbuilding Steel: High Strength Steel for Shipbuilding aims to reduce hull weight, lower fuel consumption, which is the so-called "saving the ship." With steel production and ship design technology, the yield strength of steel by increased from 315MPa 355MPa
. The recent trend is the use of high-value higher yield strength steel, such as the yield strength of 390MPa. Japan has developed a series of large heat input welding adapt to the marine board. Using MACS technology companies such as JFE developed YP390 marine thick steel plate, the
Steel low-N, containing a small amount of Nb and add the REM-Ti, welded joint in high heat conditions, still has good low temperature toughness. Experimental results show that the performance of steel and 147 ~ 274kJ/cm line energies electrogas performance are full of welded joints
Meet requirements. In addition, Japan also uses technology developed YP355MPa EWEL LPG low-level marine board, the tensile strength 520MPa, affordable energy for the welding line 106kJ/cm; and its development Q390MPa plate, under the input energy in the 600kJ/cm
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