Materials Literature
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The structure of TRIP(transfornation induced plasticity)steel 0.20C- 1.08Si- 1.43Mn during continuous cooling has been studied by Gleeble- 1500 thermal simulation machine to get CCT( continuous cooling transforation)curves and to obtain that the bainite particle occured with cooling rate 10 ℃/s and the lath bainite go…
There were obvious mixed grain structure in X60 pipeline steel(0.04～0.06C,1.24～1.30Mn,0.04~0.05Nb,0.006～0.008Ti,0.015～0.030V)produced by 6 pass CSP(compact strip production)rolling. The mixed grain structure was climinated and the grain sizes in steel were 5.6~8.0 pm by no V added,modifed the composition-0.06~0.08C,1.…
The 230mm×230 mm×1350 mm LZ50 steel billet for vehicle axle is produced by quality hot metal pretreatmnent - 120 t converter melting and SiAlBaSrCa combined deoxidiing- ladle refiring with Si-Ca powder injection + RH- TB vacuum degassing- 5 t ingot casting - rolling process. The production results showed that due to c…
Based on research of main composition alloying principle for hot working die steel,the studied new precision casting hot working die steel was melted by a 250 kg medium frequency induction furnace and the wearing test on test steels at 400 ℃ was carried by MG2000 high temperature friction-wear testing machine. The res…
The 0. 17~0.23C-≤0. 15Mo steel 20G for high pressure boiler is melted by a 92 t UHP EBT EAF-LF process at Chengdu Iron and Steel,Pan Steel Group. The operation practice showed that 35% pig iron in charge for arc furnace,adding 3~10 mm carbon particle and stengthening supply oxygen to form 500~750 mm foaming slag were…
The retaining ring is an important component of turbogenerator. The high deformation stress-strain curves of three kind of retaining ring steel-0.53C- 16.98Mn-3. 17Cr(1),0. 12C- 19.57Mn- 19.27Cr-0.60N(2)and 0.06C- 18.58Mn- 19. 15Cr-0.69N(3)and the high temperature plasticity- reduction of area of containing nitrogen r…
The ulra low carbon bainitic steel ULCB570(0.02C- 1.55Mn-0.62Ni-0.53Cu-0.0035B-0.055V-0.019Ti- 0.028Nb was melted by a 50 kg vacuum induction furnace in laboratory,of which the 25 mm finished plate was rolled from forged 80 mm slab with beginning rolling temperature 1150 ℃,finishing temperature 900 ℃ and air cooling.…
The structure and properties of 3.5 mm strip of steel SS330 (0.04%～0.07%C) produced by FTSR(Flexible Thin Slab Rolling)process from 70 mm thin slab at Tangshan Iron and Steel.The results showed that the structure of FTSR hot rolled SS330 steel strip was uniform,the average grain size was 6.2～7.0 μm,yield strength 284～…
The hot plasticity(reduction of area)of steel 60Mn-0.61C,0.74Mn,0. 18Cr was carried out by Gleeble-2000 dynanic themmo mechanical simulator using solidifying method. It was obtained that there were two low ductility regions at high temperature - more than 1300 ℃ and 925~750 ℃.At temperature between 925 ℃ and 750 ℃,the…
An 100 t AC shaft are furnace with transformer rating capacity 60~ 72 MVA was put into production at An- yang Steel in November 1999.With adopted the operation technology such as charging about 33% hot metal,shaft preheating temperature of scrap between 400 ℃ and 600°℃,oxygen-oil burner and water cooling oxygen jet op…
The annual output of steel melted by converter was nearly up to 190 million tons in China in 2003, which was 85.2% of annual output of steel in China and was 25% of world converter steel output in that year. The number of 50 ~ 300 t converters increased to 134 sets in 2003 from 75 sets in 2001, and the process and tec…
Through practice of bearing steel producing by hot metal pre-desulfurization - 100 t top and bottom combined blown converter - Ar stirring - LF(VD) - billet concasting process, it was obtained that with melting end point carbon between 0.2% and 0.6% , the oxygen content in steel was between 50 X 10-6and 150 X 10-6by d…
The weight of one crankshaft finished product of steel 42CrMoA (0.34～0.49C,0.9～1.2Cr,0.15~ 0.25Mo) for diesel engine is about 1 t, for which the weight of forging blank is 6.2 t, while the weight of electroslag remelting(ESR)casting - welding blank in only 1.5 t.The chemical composition of steel 42CrMoA ESR casting bl…
The first pass hot rolling process of compact strip production of 1 500 mm x 68 mm thin slab at Baotou Iron and Steel has been simulated by Marc commercial software with the aid of elastic-plastic thermal-mechanical coupled finite element method (FEM) . And the distribution and change of equivalent stress field, strai…
The thermodynamic equilibrium phases in T122 heat-resistant steel (0.11 ~ 0.12C, 11.37 ~ 11.97Cr, 1.90〜1.93W, 0.38Mo, 0.86 〜0.90Cu, 0.05Nb, 0.19- 0.20V, 0.58- 0.67N, 0.002 3 〜0.002 8B) and the effect of alloying element Cr, Al, Ti on S ferrite and major precipitated phases at temperature between 820 °C and 1 200 °C ha…
The structure evolution of a Nb-microalloyed extra-low carbon steel 0.03C- 1.05Mn-0.6Cr-0.08Nb during 1200 ℃ heating,then cooling to 850 ℃ and reducing 50%,holding at 850 ℃ for 20~1000 s fast cooling to 450 ℃,air cooling has been simulated and tested by Thermecmastor -Z thermal simulator. The test results showed that…
The 150 mm×150 mm billet of carbon and alloy constructional steel,high carbon steel and welding rod steel casts by R9 m 4 strand concaster at Shiheng Special Steel Works. Through optimized secondary cooling process modified 0.5~0.8 MPa water pressure,0.80~1.30 L/kg water ratio and 3 section manual water cooling proces…
The compression deformation test at temperature between 850 T and 1 000 X. with strain rate 0.1 * 10 1/s of steel BSOMnSi- 0.32C, 1.04Mn, 0.85Si, 0.019P, 0.009S has been carried out using Gleeble-1500 thermal simulation machine to study the dynamic recrystallization behavior of the steel. And the relation of peak stre…
In condition of commercial production at Maanshan Steel, with electric current parameter within limits 400 ~ 510 A and 2.0 ~ 2.5 Hz, the distribution characteristics of magnetic induction intensity in concasting mould with M-EMS for 8380 mm round bloom has been measured by using Gauss-meter. Hie results showed that th…
According to characteristics of the depth of metal and slag, the furnace structure and size, and the revamping design for an top-blown converter (charging metal 85 t) modified to a top and bottom combined blown converter, a cold simulation model for top and bottom combined converter has been designed and established t…