Materials Literature
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In order to study the influence of nozzles blocking of a 210 t RH unit up-snorkel on circulation flow rate, the 1:4 water model test has been carried out. Results show that with numbers of blocking nozzles in sequence being more than 3,the circulation flow rate decreases obviously; as the number of blocking nozzles is…
In light of the problem of low yield of pipe for petroleum produced by Φ114mm cross roll piercing elongation(CPE)mill,an analysis on production process flow sheet has been carried out. It is obtained that hot-sawing on pipe in middle procedure and hot-cutting ends are two factors led to low yield. With adopting the im…
Effect of Nb content on oxidation resistance and tensile strength at 1 150 T of as-cast alloy HP40 ( % : 0. 40C, 25Cr, 35Ni, 0. 15Mo, 0. 05Ti, 0. 4 〜2. 1 Nb) melted by a 10 kg vacuum induction furnace has been studied by Gleeble-1500 thermal simulation machine. Results show that the HP40 alloy contained 0. 8% Nb has e…
Effect of 0 ~ 0. 21 % Ti and 0 ~0. 29% Nb on structure, recrystallization texture, mechanical properties and formabilitv of ultra-low carbon ferrite stainless steel Cr18 (% ： 0. 008 ~0. 009C, 17. 48 ~ 17. 57Cr) has been studied. Results show that the grain size of annealed cold rolled sheet of Nb stabilized steel is f…
A multi-input and multi-outpul support vector regression algorithm is introduced to predict the real-time object surface temperature of casting slab in secondary cooling zone by using the given object teinperaiure schedule calculated by metallurgical technicians. Test results of casting 200 mm x 1 534 mm slab of steel…
With taking the technology measures such as increasing Mn content in steel from 1. 55% ~ 1.65% to 1,75% 〜1. 85% , replacing 0. 20% ~0. 25% Ni in steel by 0. 25% 〜0. 35% Cr, adding 0. 01 % ~0. 04% Ti for microalloying, controlling [ N] ≤80 x 10-6and [O] ≤15 x 10-6by RH vacuum treatment, decreasing casting secondary coo…
The pipeline steel(%:0.039~0.042C,1.56~1.62Mn,0.01Ti,0.05Nb,0.03V) was melted by torpedo desulfurization,adding low sulphur scrap in LD,LD tapping with slag stopper and adding deoxidizer Si-Fe and Mn-Fe and controlling end [C] 0.026%～0.030%,RH degassing treatment and alloying added Mn-Fe,LF refining with high basicity…
Effect of reentrant casting of slab on the side reversal ( both side roughness band) of hot rolled coil and the mold life is obtained by test of reentrant casting of 180 mm X 1 238 mm 0Cr18Ni9 stainless steel slab. Results show that as the cast slab side reentrant value is 3 ~4 mm, the average width of side reversal o…
A study on the field of fluid flow in 4-strand 25 t tundish with two different control devices has been carried out by 1 ： 2. 5 tundish water model test. And the effect of original tundish and improved tundish with modified diameter of hole for guide fluid at side of dam and its inclination, and added turbulent inhibi…
Effect of each steelmaking stage on nitrogen content in liquid 0. 45C steel and 42CrMo steel is studied by analysis on nitrogen in sampling liquid steels at each stage of 100 t BOF-LF-RH-CC flow sheet at Huaigang Special Steel. It is obtained that there are nitrogen pick up at each stage except argon blowing and RH st…
Effect of parameters of quenching at 890 〜930 ℃ for 25 ~45 min and tempering at 570 ~610 ℃ for 50 〜 80 min on structure and mechanical properties of 245 mm x 12 mm tube of steel 25MnV (% : 0. 25 〜0. 30C, 1. 50 ~ 1. 80Mn, 0. 06 ~0. 15V) has been studied by measured CCT curves and orthogonal test of heat treatment. Resu…
Effects of normal nitriding process with 280 Pa at 560 ℃ for 12 h and cycling plasma nil rich: g process with 170 Pa at 560 °C for 3 h then quick cooling to ambient temperature on structure, hardness, gradient of hardness, and wear resistance of nitride layer of steel 38CrMoAl ( % ： 0. 35 - 0. 42C, 1. 35 ~ 1.65 Cr, 0.…
CCT curves and effect of nickel content on ductility and tensile strength of weathering steel 09CuPCrNi (% ： 0. 08C, 0. 34 ~0. 35Cu, 0. 091 〜0. 099 P, 0. 53 〜0. 55 Cr, 0.02 ~0. 27Ni) at 700 〜1 300 ℃ have been measured and studied by using Gleeble 3000 thermal simulator. Results show that with decreasing Ni content to…
Bi free-cutting steel 1215M (% ： 0. 06C, 0. 04Si, 1. 25Mn, 0. 39S, 0. 17Bi) has been developed to replace Pb free-cutting steel SUM24L. The flow sheet for production of Bi free-cutting steel is 40 t UHP EAF- 40 t LF (feeding Bi wire)-180 mm X 180 mm CC-continuous rolling process. Test results show that the distributio…
Effects of B2O3 on melting temperature of two CaO-based refining slag series with low basicity [ ( CaO)/ (SiO2)=3 ~4] and high basicity [ (CaO)/(SiO2)= 5 〜7. 5 ] have been studied. Results indicate that B2O3is more available than Al2O3and CaF2to decrease the melting temperature of CaO-based refining slag, for low basi…
Charge of 70 t high impedance UHP EBT electric arc furnace at Chengdu Iron and Steel,Pansteel is 20% hot metal+80% pig iron-scrap. Three RCB coherent oxygen lances are installed at wall of furnace and two lances for coal powder injection are installed at wall of both side of furnace door. Steelmaking practice showed t…
Based on CaO-SiO2-Al2O3-MgO-Na2O-CaF2slag system with 0.85 basicity, the effect of rotating velocity of TiO2bar (50-120 r/min) , basicity (0.7 ~ 1.15) , flux temperature (1300 ~ 1480 °C ) , TiO2(0 〜12% ) and CaF2(5% 〜15% ) content on TiO2absorbed rate by mold flux has been studied by rotating kinetics method. Results…
Simulated calculation and analysis on equilibrium precipitated phases γ,M6C,P,μ and non-equilibrium solidification of alloy C-276(%;≤0.01C,14.5～16.5Cr,15.0~17.0Mo,≤2.5Co,4.0~7.0Fe,balance Ni)have been carried by using Thermo-Calc thermodynamic calculation software. Results show that during solidification of alloy the…
Behaviour of thermal deformation of steel Cr5 (% ：0.85C, 5.0Cr, 0.6Si, 0.5Ni, 0.4Mo, 0.1V) with stain rate 0.001 〜1 s-1 at 900 ~ 1200 °C has been studied by using Gleeble-3500 thermal simulator. The apparent activation energy Q for steel Cr5 is 307 kJ/mol. The thermal deformation equation for steel Cr5 is given to cha…
Pipeline steel X70 [%:0.04C,1.53Mn,0.106(Nb+V+Ti)] is melted by 100t BOF-LF-RH-CC flow sheet and feeding Φ13 mm 60Si-28Ca wire treatment is used during LF refining.It is obtained by calculation and commercial production test that with increasing wire feeding speed to 200 m/min from 100 m/min,the average calcium yield…