Materials Literature
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According to the present status of research and development of high strength non-quenched and tempered cold heading steel at home and abroad, the chemical composition, characteristics of process, structure and mechanical properties of 800 ~ 1200 MPa high strength non-quenched and tempered cold heading steels are analy…
Effect of oxygen lance nozzles, lance level, top blowing rate and bottom blowing rate on bath mixing time, penetrating deptht impact area and splashing amount has been studied by orthogonal design test using 1： 6.35 water model for a 50 t top and bottom combined blown converter at Tang steel. Results show that as comp…
The studied steel 0Cr15Ni5WMoVNb(%:0.068C,14.54Cr,5.32Ni,0.88W,0.92Mo,0.20V, 0. 10Nb)is melted by 5 t medium frequency induction furnace+2 t vacuum electro-slag remelting furnace,then forged and hot rolled to φ45 mm bar products,and the test specimens solid-solution-treated at 1000 ℃ for 30 min +cold-treated at -70℃ f…
The X70 pipeline steel (% ： 0. 02 - 0. 05C, 0. 145 〜0. 25Si, ≤0. 015P, Wt). 002S, 1. 70 ~ 1. 80Mn, 0. 085 ~ 0. 15Nb, 0. 2 - 0. 3Ni, 0. 015 ~ 0. 040Al, 0. 01 ~ 0. 03Ti) is produced by hot metal pretreatment - 120 t converter - RH - LF - (200 ~ 250) mm x (900 ~ 1 800) mm slab concasting process. With metal manganese to…
Structure and mechanical properties of steel !Crl2Ni3Mo2VN quenched at 1 010 °C for 1 h, oil cooling and double tempered at 580 ~620 °C for 1 h, air cooling have been studied. Test results show that in tensile specimen tempered at 620 °C ,a large amount of coarsening block M23C6carbides precipitate at boundary of temp…
The numerical simulation on distribution of temperature field,stress field and displacement field of copper mould wall with 10 mm thickness for casting liquid of 0.2% C steel has been carried out by using finite element analysis software ANSYS/thermal,with comparison to get the safety of serious service part of mould…
Structure and mechanical properties of steel 20SiMn3NiA normalized at 860 ℃, oil quenched at 900 ℃ for 40 min and tempered at 180~650℃ for 90~150 min have been studied. Results show that the better tempering temperature of steel is 200~250℃,the lath martensite, fine slim rod precipitated carbide and residual austenite…
Charged weight for the 70 t arc furnace is 80-81 t including direct reduction iron hot briquette (HBI) 14.6-15.2 t and hot metal 23-27 t, its tapping liquid amount is 77-78 t, electric power consumption 316 ~ 324 kWh/t, oxygen consumption 29.7-33. 0 m3/t and tap-to-tap time 48 ~54 min. Steelmaking practice shows that…
Drill Pipe is main component part of oil drill-stem, its service environment is extremely severe and stress conditions are very complicated. The development trend of overseas drill pipe products is presented from both development of drill pipe grades and connector including ultra-high strength drill pipe, sour service…
The effect of temper rolling (0~3.3%) and natural aging on mechanical properties and bake-hardening performance of 0.7 mm ultra-low carbon bake-hardening steels plate (%:0.0030C,0.008Nb-0.003Ti,0.0030N and 0.0030C,0.012Nb-0.012Ti,0.0042N) annealed at 830 ℃ has been studied. Results show that at beginning with in- crea…
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…