Materials Literature
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The quenching and tempering process on mechanical properties of a new high strength spring steel 60SiCrV7 (0.54C~0.65C,1.35～1.65Si,0.7～1.0Cr,0.1～0.2V)has been tested the results showed that by optimum heat treatment process - oil quenched at 920 ℃ and tempered between 430 ℃ and 450 ℃,the tensile strength of steel was…
The test of 8 pass cold extrusion of equal channel angular pressing (ECAP) with ratio of extrusion reduction 1.02 of each pass for 00Crl8Nil2 austenite stainless steel has been carried out. The results showed that the strength and hardness of steel increased obviously after two pass extrusion, then increased minor aft…
The free cutting steel 35MnVS- 0.33～0.40C,0.30～0.60Si,1.00～1.40Mn,0.06～0. 12V, ≤0.035P,0.035～0.075S was produced by 30 t EBT EAF-40t LF (wire feeding)- 3.15 t ingot casting process. The production results of 30 heats steel 35MnVS showed that the sulphur content in steel after sulphur powder wire feeding was 0.040%-0.0…
Based on multicomponent regression analysis, the model of prediction for end temperature of molten steel TLin CAS-composition adjustment by sealed argon bubbling refining has been established: TL= t -(-920.64 + 0.0643625X1+0. 187162X2+ 0.581293t +0.003662X3),where X1- molten steel laying aside time /min;X2- refining t…
Based on the research on physical metallurgy prediction model including the model of austenite recrystallization in microstructure evolvement, carbo-nitride precipitation, and relation between austenite phase transformation and structure-properties during strip control rolling and cooling, the austenite grain size of…
The steel B7(40CrMnMo) for high strength heat-resisting bolts is produced by 70 t Consteel UHP arc furnace - 70 t ladle refining furnace - 4 strand 150 mm×150 mm concasting- continuous rolling process at Egang. The charge of arc furnace is 30% pig iron + 70% quality scrap of which the preheating temperature is no less…
The stress-strain curves and microstructure evolution o£ a microalloyed steel - 0.05C, 1.57Mn, 0.50Cu, 0.05Nb, 0.014Ti, 0.001 2B between 800 and 1 100 X. have been tested and studied by Gleebe-1500 hot simulator using single pass reduction test method, and based on the experimental results the grain size model and the…
The Φ25 ~ 60 mm round bars of gear steel 20CrMoH have been produced at Panzhihua Iron and Steel by 120 t top and bottom combined blown converter - LF + RH refining - 280 nun x 380 mm bloom concasting - hot rolling process. The examination results showed that the products analysis was 0.19- 0.22C, 0.54 ~ 0.58Mn, 0.97 -…
Two kinds of metallurgical process for melting a <0.005%C-≤0.005% N ultra-low carbon and ultra-low nitrogen steel by a 90 t top and bottom combined blown converter a Wuhan Iron and Steel: single slag process KR desulphuration -LD - RH-KTB - CC and two-step steelmaking process KR desulphuration - LD desiliconisation an…
The effect of vacuum,refining slag,argon stirring process and [Al]s on oxygen content in steel has been analyzed and studied in production of Mn-Cr,Cr-Mo and Cr-Ni-Mo series new type gear steels for car by 30 t EBT are furnace-40 t LFV refining process to get that it is available to obtain lower oxygen content in stee…
By analysis on main metallurgical units- primary melting furnace,refining furnace,vacuum blowing oxygen unite for stainless steel and comparison of process routes- one- step, two- step and three- step steelmaking process route,it is put forward that the corresponding main metallurgical equipment and process route shal…
The each technology parameters in range of carbon 0.58% -0.83%, water ratio in secondary cooling zone 0.82-2.86 L/kg, casting speed 1. 9 〜3.0 m/min and superheating of liquid steel 17 ~ 60 ℃： on center carbon segregation of 140 mm x 140 mm and 150 mm x 150 mm billet has been analyzed at given mould electromagnetic sti…
The spring steel 65Mn was produced by 100 t top and bottom combined blown converter melting- ladle furnace refining- 6 strand 150 mm×150 mm billet concasting. The end point [C] was0.08%～0. 12%,[P]≤0.012% and [S]≤0.03%, and the yield of recarburizer was 85%～90%. During refining the basicity of slag was 2.5～3.0 with fee…
The expansion curves of phase transformation in hot work die steel H13- 0.34C,0.39Mn,0.91Si, 5.11Cr,1.34Mo,0.91V,0.0015S,0.009P with austenitizing temperature 1060 ℃ at different cooling velocity between 20 ℃/s and 100 ℃/h were determined by Gleeble 1500D thermal simulation test machine and the continuous cooling tran…
The magnetic properties of electrical sheet steel including general(≤0.03%C,≤2%Si),oriented and nonoriented(~3%Si )steels increase mainly by steelmaking process- decreasing C(to ~0.003%),0 and N content and controlling inclusion in steel,rolling and heat treatment process. The development trend of electrical sheet ste…
In accordance with optimum revamping of structure of mould copper plats for a 1400mm X 170mm slab con- caster, a numerical simulation for 3- dimensional temperature fields of mould copper plats with two kinds of copper plate and immersed nozzle structure parameters before and after revamping has been studied by finite…
The effect of Al2O3cylinder spinning thread speed on Al2Q inclusion dissolution velocity in refining slag - 4-10 MgO, 34-39 Al2O3), 33 ~ 42 CaO, 3 ~ 9 CaF28 SiQ21.3 - 8.7 SrO and the dissolution velocity constant of Al2O3in slag have been tested and studied by modified viscosity testing device. The results showed that…
A model for energy equilibrium in melting process of vacuum induction melting and the rational electric power supply regulation in each melting period have been derived and got by systematical analysis and calculation on power requirement and loss in melting process of 3 - 6 t vacuum induction furnace and on basis of…
The peak value load of main electric power consumer such as steel works causes to waste electric power re- source, in short supply of mains power and to increase electric cost for consumer. The project of electric load demand side management (DSM)for Xigang Steel make the electric load(demand)to decrease by about 10%-…
The phenomena of oxygen contamination from crucible materials on molten steel during vacuum melting has been studied by a 50 kg vacuum induction furnace with magnesia crucible and a 25 kg vacuum induction furnace with calcia crucible to reseach the basic law and main factors of oxygen contamination from crucible mater…