The examination results showed that in comparison without argon gas shielding casting the total oxygen content inΦ450 mm round billet of wheel steel produced with shielding argon gas at Maanshan Steel decreased to 27. 9×10-6 , from original 49. 3×10-6 , the total inclusion content in steel decreased to 14. 8×10-6 from 29. 7×10-6 the quality of cast billet obviously increased and the mechanical properties of wheel increased appreciably.
In condition of commercial production at Maanshan Steel,with electric current parameter within limits 400～510 A and 2.0～2.5 Hz,the distribution characteristics of magnetic induction intensity in concasting mould with M-EMS for Φ380 mm round bloom has been measured by using Gauss-meter.
The three D heat force coupling analysis of the rotary rolling process of the round bloom in the piercing preparation zone during rotary piercing operation was carried out with MARC/Autoforge Software,identifying characteristics of distribution of stress/strain field and temperature field which conform to the result of the physical simulation conducted.
Production and quality index of round blooms are close to unit values,and this means that all Danieli technology guarantees a simple management of bloom casting that allows full control of the machine in each phase of the process.
Prior to the manufacturing process of tube cold-rolling,the mother tubes and round blooms have to be pickled with sulfuric acid solution to remove scales off the materials so as to ensure that qualified cold-rolled tubes are produced.
This paper has established a tiny strip mathematical model for computing the bulge deformation of round cast and, on the basis of this model, developed the formula for calculating the deformation.
In this article, the stresses, strains, sump depth, mushy zone length, and temperature fields are calculated through the simulation of the direct-chill (DC) casting process for a round billet by using a finite-element method (FEM).
A method predicting the thickness of solid and liquid slag films is presented to understand the complicated heat transfer from the strand to mold for round billet continuous casting.
The distribution of deformation in the section of tube rounds during Man-nesmann piercing has been experimentally studied with a view to establishing itsmechanism. It was shown: 1. The distribution of the intensity of strain across the diameter of a tuberound is inhomogeneous with W-shaped. The intensity of strain on the sur-face layer and centre layer is stronger than that on the intermediate layer. 2. Its inhomogeneity increases during the process. 3. Distinct deformation at the centre of the tube rounds ...
The oxide inclusions in steel have a important influence on the qualities of rolled product.In this paper, the quantity, morphology,composition and dimensional distribution of oxide inclusions for the strand of horizontal continuous casting has been studied.As well as the origin of oxide inclusions in the strand of continuous casting is discussed.
In order to give an optimal set of withdrawal parameters, a mathematical model which can beused to discribe the growth and formation of primary shell of strand has been presented on thebasis of axial symmetry heat balance equation. By means of the Crank-icolson finite differenceformat (ADI method), after discretization, the equation can be solved by computer accurately andrapidly. For low carbon killed steel, strand of dismeter 90mm and casting speed of 2m/min, itshows that the calculated shell formation at...
圆坯
round billet
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