Materials Literature
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The effect of cooling rate (0. 5 ~35℃/s) and strain (0. 3 ~ 0. 6) on structure of X100 pipeline steel (%： 0.06C, 0. 23Si, 1.90Mn, 0. 005P, 0.0003S, 0. 28 Mo, 0. 25 Ni, 0. 23 Cr, 0. 05 Nb, 0.02Ti, 0. 20Cu, 0. 025Al) has been studied by thermo-simulation test and the static and dynamic continuous cooling transformation…
The effect of Si content on Structure and mechanical properties of steel CrMo2SiV (% : 0. 96 ~ 0. 97C, 0. 31 ~0. 36Mn, 7.98 ~8.04Cr, 2.01 ~2.08Mo, 0. 31 ~ 1. 52Si, 0. 20V) melted by a 25 kg vacuum induction furnace has been studied. Results show that with increasing Si content the size and amount of eutectic carbides…
The longitudinal surface crack of 68 mm x 1 600 mm casting slab of Q235B steel (0. 18% C) and Q345B sleel (0. 17%C) produced by CSP process at Jiuquan Steel mainly occurred at first slab between heats with width of crack 0. 01 -0. 30 mm, depth 0. 10 mm and length ≥50 mm. The results by analyzing the influence factors…
The model of finite differential method for solutes micro-segregation during solidification of steel has been established by analysis on representative regular hexagonal dendrite structure micro-segregation model combined with applied steel grades. Non-equilibrium solidus lines calculated by established model coincide…
The mechanical properties and micro structure of microalloying pipeline steel X70 ( % ：0. 04C, 1. 54Mn, 0. 05Nb, 0. 04V, 0. 01Ti, 0.003 9N) of 14. 6 mm sheet continuous rolled from 150 mm casting slab have been tested and analyzed. Results show that with adding micro niobium and after breakdown with control rolling by…
The characteristics of liquid steel-slag interfacial profile and liquid field in mold with original nozzle for 304 stainless steel 200 mm × 1 550 mm slab have been studied by numerical simulation. Results show that in mold with original nozzle the upper returning flow is strong, led to liquid steel-slag interfacial pr…
A study on melting temperature of CaO-Al2O3-SiO2-MgO-CaF2refining slag has been carried out by using orthogonal experimental method. With variance analysis and significance criterion it is obtained that the optimum ingredient of the pentatomic refining slag is 25% Al2O312% CaF27% MgO and R2 ( CaO/SiO2) =2.5. And the r…
According to the requirement of production for high strength pipe line steels at Masteel and combined with the forming region of 12CaO , 7 Al2O3of CaO-Al2O3-SiO2phase diagram, the ladle refining slag series ( % ： 55 - 60CaO, 7 〜12SiO225 ~ 30Al2O34 〜8MgO) for pipe line tube has been developed and applied. 300 t LF refi…
The regularity of bending of 100 m U75V steel straight rail during cooling process before straightening has been calculated by analyzing the boundary conditions of cooling of 100 m rail and using three-dimensional instantaneous non-linear finite element method. Results show that the bending deformation of the straight…
In spring steel 60Si2MnA and 55CrSiA steelmaking by EAF-LF-VD, it is available to control [ Als ] ≤ 60 x 10-6the total [O] (9 〜20) x 10-6and get the rating of A series inclusion ≤0.5 , B series ≤0. 5 , C series ≤ 1. 5 and D series ≤0. 5 by adding 17 ~ 23 kg/t low aluminum ferrosilicon (Al content ≤0. 50% ) during EAF…
Based on similarity principle, the flow performance of liquid in 60 t tundish for 230 mm x 130 mm slab casting has been studied by 1：3 water modeling test, and the average residence time, and the volume of dead area, plug area and mixed flow area are calculated by measured curves of residence time distribution (RTD) o…
The steel grades and characteristics of traditional and new developed hot working die steels at home and abroad including die steels for hot forging, hot extrusion and pressured casting, as well as for special properties service are presented in this article, while the research progress on heat treatment and surface t…
Tensile hot deformation behavior and structure change of high nitrogen austenite stainless steel Mnl6Cr22Nil. 6N0. 6 (%： 0.12C, 22.05Cr, 15.52Mn, 1.64Ni, 0. 58N) with strain rate 0.005 s-1at 900 ~ 1 300 ℃ have been studied by Gleeble 1500D thermal simulator. Results show that the high nitrogen steel has nice plasticit…
Double passes hot-compression test of martensite steel 403 Nb (% ： 0. 16C, 11. 98Cr, 0. 03Mo, 0. 22 Nb, 0. 01V, 0. 12Ni) with internal time between passes 1 ~ 100 s and strain rate 0. 01 ~ 10 s-1at 950 ~ 1 150 °C has been carried out by using Gleeble-3500 thermal simulator. With summarizing established different stati…
The oxidation test of concasting slab specimen of steel SPAH (% : 0. 05C, 0. 25Cu, 0. 12Ni, 0. 41 Cr) at 900 ~ 1 250 ℃ for 20 min was carried out by using box electric resistance furnace in laboratory, and the structure and chemical composition of oxidation layer of specimen were obsen ed and analyzed by scanning elec…
Based on similarity theory, the effect of process parameters on refining mixing time has been studied including alloy adding position in Single Snorkel refining furnace, gas blowing rate (2 ~ 10 L/min), liquid level in snorkel vacuum chamber (18. 5 ~67. 0 cm) , submerged depth (75 - 150 mm) and gas blowing position by…
A new concept of "non-carbon metallurgy by solar energy photovoltaic technology" is proposed, according to the research requirement its experimental system structure and parameters are defined and I kg-capacity experimental furnace is designed and manufactured. With defined process parameters and balance-calculated ch…
The extent of modification of Al2O3inclusion and factor of CaS inclusion formation in refining liquid of steel 20CrMnTiHl after calcium treatment have been studied by thermodynamics equilibrium calculation between liquid steel and inclusions. Calculated results show that with calcium treatment of liquid steel containi…
The thermodynamics of oxidizing and nitriding reaction of Cr in steel is analyzed and the effect of 0. 025% - 0. 045% Cr on magnetic properties of 0. 5 mm non-oriented silicon steel (% : 0. 001 8C, 0.45Si, 0.45Mn, 0. 106P, 0. 003S, 0. 001 2N) annealed at 900 ℃ + secondary annealed at 750 ~ 1 050 ℃ is tested and studie…
Based on a 120 t converter, the 3-dimensional mathematical model has been established and the calculation of Euler two phases is carried out to get reasonable eccentric position of gas permeable elements for bottom blowing. O- riginal even distribution mode of 8 permeable elements with eccentric position 0. 56 R ( rad…