Materials Literature
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Effect of 0.09%~0. 14% C content on structure and mechanical properties of 2Mn-0.003B-0.05Ti micro- alloying steel cold drawn with 5%~50% reduction and aged at 100~500 ℃ for 2 h has been studied. Results show that with lower carbon content (0.09%~0. 12%C), the finer and uniform distributed granular bainite structure i…
The simulation of temperature field, stress-strain field and rolling force of stock during 10 passes finishing rolling process from Φ16 mm rolling to Φ5. 5 mm wire of steel 42A (0. 39% ~0. 46% C) has been carried out by analysis on heat transfer in high speed continuous rolling process at steel works and by means of e…
Hot plasticity of U71Mn steel(%:0.75C,1.20Mn) and U75V steel (%:0.75C,0.94Mn,0.05V, 0.005Al) at 700~1300℃ has been studied by using Gleeble- 1500D thermo-simulation machine. Results show that as vanadium carbo-nitride precipitates at grain boundary and inside, the hot plasticity, especially the plasticity at Ⅲ brittle…
The effect of deforming temperature 800 ~950 ℃ on structure and mechanical properties of steel 55SiCrA (% ： 0. 56C, 1. 42Si, 0. 68Cr) for auto suspension spring has been studied by Gleeble-1500 thermo/mechanical simulator and using optical, electron microscopy and mechanical property test. Results show that with incre…
The math model for erosion-corrosion of liquid steel-inclusion two-phase flow in tundish on refractory has been established and the numerical calculation to erosion-corrosion characteristics of refractory in tundish with turbulence inhibitor, dams and weirs is carried out. Calculated results show that the position wit…
Commercial test for the effect of 300 mm x 340 mm bloom mold electromagnetic stirring-final electromagnetic stirring (M-EMS and F-EMS) and 3-section multiple EMS (M-EMS, S-EMS and F-EMS) on carbon segregation of bloom of steel 20CrMnTi (% ： 0. 17 ~0. 23C, 0. 80 ~ 1. lOMn, 1. 00 ~ 1. 30Cr, 0.04 ~0. lOTi) has been carri…
To counter the situation of longitudinal crack defect usually occurred on bloom (wide side 550 mm, narrow side 440 mm, waist 90 mm) in H-shape steel Q235B (0. 14% ~0. 18%C) casting at Jinxi Iron and Steel works, based on original mold powder (% : 29~30Si02, 25 ~26CaO, 10 ~ 11A12O3, 3. 0 ~ 3.5Fe2O315 ~ 17C,≤0.5H2O), a…
A 100 t RH unit with less than 67 Pa and vacuum degassing capacity up to more than 500 kg/h is de-signed and manufactured at home. Production practice show that the more recirculation rate of liquid steel with increasing argon flow rate and the longer degassing time at high vacuum, the more obvious degassing effect; t…
Main analysis of stainless-steel dust with intermediate size 1. 78μm is (% ：) 41.0Fe, 3.3Ni, 24.80, 2. 6Cr, 4.1Ca, 3. 6Zn, of which the main mineralogy is Fe3O4FeO • Cr2O3and CrO. The effect of gas-solid ratio (1.6- 4. 0 L/g), reduction time (50 ~300 s), CO fraction in H2-CO mix gas (20% ~60%) and temperature (500 〜70…
The effect of quenching at 890 ~ 780 °C on transverse impact energy of steel 27MnCrV (% : 0. 24C - 0. 30C, 0. 50 ~0. 70Cr, 0. 06 ~0. 10V) for petroleum casing pipe tempered at 630 °C has been tested and studied. Results show that with decreasing the quenching temperature, the transverse*V- notch impact energy increase…
The effect of quenching temperature1025~1125℃+570℃4 h air cooling + 720 ℃ 2 h air cooling and secondary tempering temperature 680~780 ℃ after1050~1075 ℃ quenching on mechanical properties of martensite heat resistant steel X12CrMoWVNbN10- 1- 1(%:0. 11C,10.28Cr,0.77Ni,1.0Mo,0.96W,0. 18V,0.04Nb,0.053N) has been studied.…
Development of structure o£ microalloying medium-carbon steel (% : 0.32 -0.38C, 0.001-0.010B, ≤0.05Als) controlling rolling and cooling with deformation at 760-820 ℃. and initial cooling at 750-840 °C has been studied by hot compression test by Gleeble-1500 thermal simulation machine. Results show that the average fer…
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…