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Search Results: 1 - 10 of 2558 matches for " Steel Technology "
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THE TEMPER-BRITTLENESS OF BAINITIC STEELS

TAN YU-HUA Anshan Institute of Iron,Steel Technology,

金属学报 , 1959,
Abstract:
THERMODYNAMICS ON THE SELECTIVE OXIDATION OF ELEMENTS IN MOLTEN MATTE AND METALS

Wei Shoukun Beijing University of Iron,Steel Technology,

金属学报 , 1982,
Abstract: The selective oxidation of elements in molten matte and metals is reviewed and discussed from thermodynamic viewpoint,Ni vs S in nickel matte,Cr,V,Nb, Mn or P vs C in iron melts being taken as examples of practical application.On grounds of thermodynamical analysis,a concept of transition temperature of oxi- dation has been introduced,and methods of calculating the transition temperature with either the two-steps- or the one-step-method are presented.On the assumption that no nucleation energy is required for the formation of new phases (gas bub- bles and the condensed oxidation products),the transition temperature of oxida- tion is independent of the forms of oxygen present,be it gaseous oxygen,dissolved O] in metal melts or FeO from the slag,and also independent of the pressure or activity of oxygen,but it depends solely upon the nature and activity (pressure) of the reactants and products taking part in the reaction.Furthermore,the transi- tion temperature of oxidation is not a fixed temperature,it varies continuously with the composition of the bath as the oxidation process goes on.Reducing the pressure of the gaseous product would help to lower the transition temperature of oxidation. With the transition temperature of oxidation theoretically calculated,it is possible to deduce the optimal conditions for allowing one element preferentially oxidized while leaving the other element practically intact in the bath.Small- scale experiments and industrial practices show that the concept of the transition temperature of oxidation does successfully serve as a guide to control the blowing (smelting) operation,with the result that the desired element could be oxidized selectively.The kinetic factors which influence the sequence of oxidation of ele- ments in the bath are also briefly discussed. For the desulphurization of nickel matte,the decarburization in the 18-9 stainless steel manufacture (including the AOD process)and the decarburization of high-carbon ferromanganese,the blowing operation should be run so that the temperature of the bath should always be higher than the transition temperature of oxidation corresponding with the composition of the bath.But for the dechro- mizing of pig iron,and the extraction of V or Nb from the pig iron,smelting operation should be carried on,so that the temperature of the bath should be kept always lower than the transition temperature of oxidation for the respective com- position of the bath.As regards the sequence of oxidation of P with respect to C,besides the effect of the transition temperature of oxidation,the basicity and the FeO-content of the slag for holding P_2O_5 as well as the pressure exposed to or sustained by the CO-bubbles should be both considered.
AN INVESTIGATION OF BEHAVIOUR OF CERIUM IN MOLTEN IRON AND ITS REACTION ON REFRACTORIES BY MEANS OF TRACER

Res Gp of Isotope,Peking Institute of Iron,Steel Technology,

金属学报 , 1977,
Abstract: The behaviour of rare earth elements, taking cerium as representative, in moltencommercial pure iron and their reactions on refractories have been inveshgated bymeans of autoradiography and radioassay. Results show that under steelmaking tem-peratures the evaporation of cerium from molten iron or cerium oxide from slag isvery slight, and cerium in molten iron reacts in different degrees on crucibles made offireclay, high-alumina, magnesia, alumina-magnesia, silica, as well as alundum, electro-fused-magnesia and zirconia. These erosive reactions are affected not only by the chem-ical constituents but also by the physical properties of refractories. It was observed byautoradiography that the erosive reaction products may spall away then to form rareearth inclusions in iron consequently. A considerable part of these reaction productsand the rare earth inclusions do not float to the surface of liquid metal, and may adhereto the crucible wall. The blockage on laddle nozzle and runner during teeming has beenalso discussed.
AN INVESTIGATION OF MECHANISM ON THE REMOVAL OF OXIDE INCLUSIONS DURING ESR PROCESS

Fu Jie Beijing Institute of Iron,Steel Technology,

金属学报 , 1979,
Abstract:
THE DISTRIBUTION OF DEFORMATION IN TUBE ROUNDS DURING MANNESMANN PIERCING

Lu Yuqiu,Wang Xianjin Beijing Institute of Iron,Steel Technology,

金属学报 , 1980,
Abstract: 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 has taken place be-fore the cavity occurs, so that the fracture is tough. 4. It is proved that the results obtained by adopting three experimental meth-ods are very alike.
THE APPLICATION OF PHACOMP IN IRON-BASE SUPERALLOY

Res Gp of Superalloy Beijing Institute of Iron,Steel Technology,

金属学报 , 1978,
Abstract:
AN OBSERVATION OF BAINITIC SUBUNITS IN Fe-Ni-C AND Fe-Si-C ALLOYS

LI Chengji Beijing University of Iron,Steel Technology,

金属学报 , 1985,
Abstract: The morphologies and substructures of bainitic ferrite formed isothermally inFe-Ni-C and Fe-Si-C alloys have been studied by means of SEM and TEM.Theseobservations are interpreted in terms of current ideas concerning the structureand migration characteristics of fcc/bcc interfaces.It is concluded that the bainiticsubunits are an autocatalytically nucleated variant of the bainite lath product,which grows with some departure from local equilibrium,and which neverthelessrequires carbon diffusion during growth,And the series of transformation productsin steel:Widmanst(a
MAGNETIC PROPERTIES OF TYPE II SUPERCONDUCTORS AT LOW TEMPERATURE

DAI Wenmin Beijing University of Iron,Steel Technology,

金属学报 , 1985,
Abstract:
EFFECT OF QUENCHING TEMPERATURE ON MORPHOLOGY OF MARTENSITE IN T12 STEEL

LIU Changze Wuhan Institute of Iron,Steel Technology,

金属学报 , 1985,
Abstract:
EFFECT OF HYDROGEN ON THE MARTENSITIC TRANSFORMATION IN A 18-8 AUSTENITIC STAINLESS STEEL

Gao Peiyu Beijing Institute of Iron,Steel Technology,

金属学报 , 1979,
Abstract:
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