Materials Literature
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Crystallization characteristics of two mold fluxes (%:2.54～3.0Al203 、7.34~8.35Na20 、8.83～8.87F、 0.79~3.00Li2O)during temperature decreasing and solidifying process for≤1.3 m/min normal speed casting (mold powder TCaO/SiO2=1. 19)and≥1.5m/min high speed casting (mold powder TCaO/SiO2=1.40) of 0.07～0. 10C hypoperitectic…
Elevated temperature ductility and deformed fracture mechanism of 370 mm×490 mm cast bloom of non- quenched and tempered free cutting steel 38MnVS(%:0.42C,1.29Mn,0.09V,0.067S)have been studied by Gleeble 1500D thermal simulator. Results showed that the Zero Strength Temperature(ZST)and Zero Ductility Temperature (ZDT)…
Structure and mechanical properties of0. 15C- 1.5Mn- 1.5Al-0.3Si TRIP steel heated at 820 ℃ for 2 min then quenching in 450 ℃ salt bath for 5~300 s,air cooling have been studied. Results showed that with increasing iso- thermal-time in Bainite transformation field at 450 ℃,the yield strength and elongation of steel in…
Test steel 15MnVNq (% : 0. 15C, 1. 71Mn, 0. 11V, 0.019 0 N) and steel 15MnVq (%: 0. 15C,1.72Mn, 0. 11V, 0.003 3N) were melted by 100 kg vacuum-induction furnace with respective adding V-N and V-Fe alloy, and rolled to 14 mm plate. Examination results showed that Added 0.019 0% N in steel 15MnVq obviously promoted V (C…
Production process to get super-low phosphorus content in high grade pipeline steel has been calculated by thermodynamics to study the conditions for LD dephosphorization and controlling resulfurization and the conditions for LF desulfurization and controlling rephosphorization. As 100 t LD end [O] is 0. 055%, the con…
With round- large oval- box- flat box pass system to replace original round- flat- octagon- flat box pass system,and optimized reduction schedule to roll φ210 mm carbon and alloy steel bars from 350 mm×470 mm bloom by 800 blooming mill at Special Steel Works, Bensteel, the qualified rate of rolled steel products was u…
Φ90 mm,φ100 mm and φ105 mm products of bearing steel GCr15SiMn (%:1. 00C,0. 5Si,1. 0Mn, 1.45Cr,0.02Al) have been developed by 60t EAF-LF(VD)-300 mm×360 mm bloom casting-continuous rolling process at Shijiazhuang Steel. With EAF eccentric bottom taping, controlling LF refining slag basicity ≥3.5, VD treating, completel…
High nitrogen austenite stainless steel has been more and more widely used in industrial field as it has many distinctive advantages such as high strength, better toughness, non-magnetic, nice corrosion resistance and low sensitiveness on grain-boundary corrosion, but of which the research in basic theory and manufact…
Thermodynamic conditions to modify Al2O3inclusions in bearing steel GCr15 by Mg have been calculated which was obtained that as [Als] was 0. 03%, 2. 0 x 10-6% Mg in steel could modify the Al2O3to form MgO·Al2O3. With added 1 g magnesium aluminum powder containing 16. 55% Mg in 1 kg bearing steel liquid in a MoSi2 elec…
According to the particularity of a 15t tundish without top cover, the compound basic shielding flux YKL- 3 for tundish has been developed which can formed a loosen porous heat insulating layer at upper shielding flux and a basic flux layer at lower shielding flux as the quality of basic pre-melting stuff and expanded…
Process flow sheet at new production area of Masteel is 300 t LD-LF-RH-250 mm×2150 mm CC line. The INTESTOP CS 100 framework of slide gate nozzle is used for 300 t ladle, of which the maximum standard casting nozzle diameter is 100 mm.Production practice showed that the maximum continuous-using number of times of slid…
MSC.Marc finite element simulation software and contact analysis technique were used to simulate the three-dimensional heat deformation of TC4 ，titanium alloy (%:0.08C,6Al,4V,0.3Fe,0.05N,0.015H, balance Ti) Φ32 mm rod during rolling process with flat triangle pass and quantitatively to analyze the temperature field of…
The tensile strength (Rm) and reduction of area(Z)of 250 mm×2100 mm cast slab of steel CCSD36 (%:0. 14C,1.31Mn,0.02Nb,0.02Ti) at 600～1350 ℃ has been measured by using Gleeble- 1500 thermal simulation testing machine and the structure of fracture of tensile specimen tested at 600～1150 ℃ was analyzed. It was obtained th…
The relation between distribution of temperature and fluid flow field in tundish for concasting has been analyzed by using theory of field synergy and the distribution of temperature and fluid flow field in a tundish for six strands at a steel works was simulated and numerically calculated. Results showed that as tund…
6 Soft reduction stands are installed at each strand of 6 strands caster for 280 mm×380 mm bloom. The soft reduction in height of bloom is ≤8 mm wih reduction rate≤1.5mm/m.Results showed that with suitable process conditions and using dynamic soft reduction technology, the center porosity of bloom was improved led to…
Solidification structure of 325 mm x 280 mm cast bloom of spring steel 60Si2Mn has been simulated with CAFE module of ProCAST software to study the effect of liquid superheating extent and secondary cooling intensity on structure of solidification of cast bloom. Results showed that with increasing liquid superheating…
Characteristics of liquid field in tundish with the straight and curved weir and dam in common use and the new optimized straight and curved weir and dam with guiding flow tube device have been studied by using 1: 3 water model and numerical simulation. Results showed that average residence time, response time and pea…
Based on process parameters of a 300 t RH-MFB unit, the three-dimension mathematical model for liquid steel flow in whole unit has been established. The gas-liquid two-phase flow was treated and described by double-fluid model to analyze the effect of argon flow rate, vacuum, number and location of nozzles on liquid s…
The effect of alloy elements, LF and VD process parameters on LF (VD) adding nitrogen in V-N nonquenched and tempered steel (% ：0.42C, 0.62Si, 1.42Mn, 0.11V, 0.015N) during refining with nitrogen blowing have been tested and analyzed. Results showed that with adding nitrogen fixed elements V, Cr and Mn at early refini…
Structure of a non-quenched and tempered steel-(%)0.37~0.38C,0.82~0.92Si,1.78～1.81Mn, 0.06Ti,0.015Nb with three different V-N content-(%)0.130V-0.0215N,0.130V-0.0304N and 0.001V-0.0207N was studied by optical microscope and transmission electron microscope,strain-stress curves of the steel were measured by Gleeble 150…