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.
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.
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).
During the cooling process, some of the wires became disconnected and only 32 of the large and 16 of the smaller crystals could be read out.
A quantitative study is carried of a metal cooling process in aqueous and water-polymer cooling liquids.
The cooling process in all stages is described with a simple exponential relationship containing two parameters.
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.
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).
With the film cooling technique, this process improves thermal exchanges between walls and fluid.
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.
Nb2.3 Au(1-x)Ptx and Nb4Au(1-x)Ptx prepared by splat cooling technique.
This makes the cooling technique general and potentially applicable to any species trappable at the temperature of the buffer gas (as low as 240 mK).