Right post-rolling controlled cooling process can make the content of needle-like ferrite at 1/4 diameter remain a lower level and guarantee the property meet the demand of GB1499-1999.
The paper introduces the actual quality level of oversea X80 line pipe with example of Ruhrgas pipeline,including alloying,control roll and control cooling process,and discusses the fracture propagation and arrest in pipeline,and weldability of high-strength line pipe.
This paper, with a semi-infinite diffusion model and a phase diagram, calculates the dependence of Ga0.47 In0.53 As epilayer thickness by three kinds of cooling technology on growth time.
In combination with ribbed rod production experiences and wire-rod mill features,a roll pass design for ribbed rod of 6 mm,8 mm,10 mm,12 mm in diameter was developed. Suitable rolling process was established and standard Stelmor cooling technology was adopted for the rolled product.
Annealing cooling processes are classified in accordance with material and thickness of each steel coil in annealing plan,then multi-input and single-output modeling problem for cooling time prediction of hood-type annealing furnace is simplified to a group of single-input and single-output modeling problem.
The advanced high strength automobile steel of same chemical composition can be manufactured by different controlled cooling processes for different strength classes.
CCT curves of 450 MPa and 550MPa high strength weathering steel were studied by gleeble1500 hot simulator and DT-1000 dilatometer. Microstructures of high strength weathering steel were investigated under different deformation and cooling processes.
The main contents include the relating for cooling technique principle, the subsections for the technique, the controlkeys, the request for the control software, the software structure and functions, and the software debugging and use,etc.
We consider low-mass halos to be those for which the characteristic baryon cooling time can appreciably exceed the comoving Hubble time, so that the cooling process can continue to the current epoch (z~0).
One of these is the effective temperature of the cooling medium; the other is a time constant of the cooling process uniquely related to the heat dissipation coefficient.
Ions reach the walls with energies below the sputtering threshold, and the wall temperature is maintained below 740 K by conventional cooling technology.
For the j→j+1 transitions, the contribution promotes sub-Doppler cooling at δ>amp;lt;0, whereas for the j→j transitions (half-integer j) it induces anisotropic heating and cooling processes.
This paper is concerned with the development of a control system for tracking of a desired temperature-time profile for accelerated cooling processes in hot rolling of steel.
Therefore, the most efficient and well-known gas cooling technique can be employed, namely, the adiabatic expansion of the volume occupied by the gas (this approach is used in a gas-expansion machine).
The process for face milling of (α+β) titanium alloy while using minimum quantity librication (MQL) as the cooling technique was optimized by using of the Taguchi method to improve characteristics.