Materials Literature
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With decreasing rolling speed, increasing reduction in rough rolling passes especially in last passes, the quality of macrostructure of continuous rolling Φ30 ~45 mm round products of bearing steel GCr15 rolled from 150 mm x 150 mm casting billet increases obviously i. e. occurred ratio of residual shrinkage hole decr…
Based on practical production data of steel ZG06Cr13Ni4Mo refining by 40 t VOD at Heavy-Duty Machinery Co, Ansteel, and according to conservation of energy and mass and principle of thermodynamics, a process model for steelmaking stainless steel with VOD has been established by using analysis method of system engineer…
According to similarity theory, the bubble behavior in single snorkel refining furnace has simulated by u- sing a scale 1 ：4 water model for an 80 t single snorkel refining furnace at steel works, and the effect of gas blowing rate (2~10 L/min) and plug diameter (15~30 mm) on bubble behavior and mixing time is analyze…
The bearing steel GCr15 is produced by pretreated hot metal (0.050% P, ≤0.005% S)-150 t BOF catch carbon blowing LF (RH) - 350 mm x 470 mm bloom casting-800 mm bar-rod continuous rolling mill process at Benxi Steel. Operation practice results show that the higher oxidative state of liquid at condition of high lance he…
The representative chemical composition system and properties of steel rails for freight transport and passenger traffic are summarized and analyzed. The key technologies of rails for railway manufacturing flow sheet including melting, continuous casting and hot rolling, and the now progress of the technologies at hom…
The growth behavior of austenite grain of secondary hardening ultra-high strength steel AF1410 (% : 0.165C, 14.10Co, 9.83Ni, 1.92Cr, 1.05Mo) heating at 800 ~ 1200 °C for 5 - 180 min has been studied. Results show that with increasing heating temperature and holding time the average austenite grain size of steel AF1410…
The N80-1 oil casing pipe steel (36Mn2V, % : 0.34-0.38C, 0.25-0.40Si, 1.45-1.70Mn, ≤ 0.020P, ≤ 0.015S, 0.01 -0.04Al, 0.11-0.16V, (Sn + Sb + As + Pb + Bi) ≤ 0.035, [O] ≤ 35 x 10-6[N] ≤ 80 x 10-6[H] ≤ 2.5 x 10-6is melted by 80t top and bottom combined blown converter-LF-VD-Φ210 ~ 270 mm round bloom casting process. With…
A computer simulation analysis on heat treatment process (electromagnetic induction heating for 55 s, air cooling for 8 s, wind cooling for 42 s then air cooling to ambient) of heavy rail end of steel U71Mn (% : 0.65 -0.76C, 0.15 ~0.35Si, 1.10~1.40Mn, ≤0.030V, ≤0.025Ti) has been carried out by using finite element met…
The effect of austenizing time (30 - 100 s) at 850 °C on structure and mechanical properties of 1 mm sheet of DF78O cold rolled dual phase steel (% ： 0.15C, 1.80Mn, 0.08Ti, 0.04Al) has been studied by using continuous annealing simulation machine. Results show that with conditions of austenizing at 850 X., cooling to…
The effect of location and number of gas permeable brick and bottom argon supply rate on mixing time of liquid in a 90 t ladle furnace at steelworks has been tested and studied by using water model with 1：2.5 geometric resemble scale. Results show that the optimum ladle furnace gas permeable brick is located under dum…
The 0.5-2.5 mm cold rolled sheet of test magnetic pure iron is rolled by 350 mm four high reversing finishing mill from 3.5-4.5 mm hot continuous rolled plate of magnetic pure iron (% ： 0.005C, 0.50 Al). Results show that the optimum annealing temperature for the magnetic pure iron sheet to get smaller coercive force…
The solubility of nitrogen in solid stainless steel 304, 304L, 301S and 301L (γ-phase) and in melts of austenite stainless steel has been calculated by using thermodynamic analysis method to get computational model for solubility of nitrogen in the steels, and the experimental research on nitriding behavior in four au…
The production process flow sheet for 198 〜308 mm heavy plate of developed die steel 718 ( % : 0.32〜0.40C, 0.30~0.50Si, 1.00~1.50Mn, ≤0.016P, ≤0.005S, 1.50~2.00Cr, 0.40-0.50Mo, 0.80~1.20Ni, 0.020-0.045Al) is 90 ~ 100 t EAF-LF-VD-40 t ESR (950 mm x 2 000 mm slab) -rolling (control cooling) -heat treatment. Examination…
Key words:Bloom of Heavy Rail Steel,Numerical Simulation,End Position of Solidification,Soft Reduction,Center Porosity
The effect of long-term aging at 620 ℃ on structure and mechanical properties of a new ferrite heat resistant steel 1Cr11Co3W3MoVNbNB (%： 0.10C, 11.08Cr, 3.20Co, 2.54W, 0.52Ni, 0.15Mo, 0.09Nb, 0.21N, 0.014B) oil-quenched at 1100 °C + high temperature tempered at 720 ℃. has been studied by using X-ray diffraction metho…
Based on insuring both mould slag with similar viscosity and melting temperature by using B2O3as a substitute solvent to replace CaF2in fluorine-containing mould flux, the temperature and capacity of crystallization of fluorine-containing mould flux (%): 31. 1 ~ 35. 5CaO, 33. 9 〜38. 5SiO212A12O33MgO, 5Na2O, 6 ~ 15CaF2…
The effect of grade of iron and steel scrap and charge matching mode on electric power consumption, tap to tap time and metallurgical quality of an 150 t Fuchs shaft furnace at Zhusteel. Results show that the requirements of max adding amount of pig iron and sponge iron, match of capacity of up and down procedure, con…
Hot tension test with strain rate 5×10-3s-1and hot reduction test with deformation 60% and strain rate 1×100s-1for 0～0.034% Ce super duplex stainless steel 00Cr25Ni7Mo4N (%:0.016～0.020C,24.50～24.72Cr, 7.06~7. 18Ni,3.61~3.73Mo,0.26~0.27N) at 950~1200℃ have been carried out by using Gleeble- 1500D thermal simulation mac…
The dynamic recrystallization behavior of Cu-P-Cr-Ni-Mo weathering steel (% ： 0. 10C, 0. 075P, 0. 65Cr, 0. 22Ni, 0.43Mo, 0. 28Cu) with strain rate 0. 01 ~ 1 s ~1 at 850 — 1 150 T： has been studied by Gleeble-3500 thermal simulation test machine to get true train-true stress curves in austenite area and dynamic recryst…
The cracks at surface of 150 mm round bar occur after rolled from 260 mm×300 mm continuous casting bloom of steel Q235D (0. 10%～0. 17%C) melted by 50 t UHP EAF (hot metal charging ratio more than 50%) + LF (VD)process at Special Steel Workesley Steel. Analysis indicated that the larger the △C-difference between carbon…