Materials Literature
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The work principle and technology characteristics of developed technology of vibration-excited nucleation in liquid and the treated effect on ingot of metal zinc ingot and 1Cr17 ferrite stainless steel ingot in lab are presented. And the commercial pilot production for application of developed device using the technol…
The effect of vacuum, temperature and nitride composition on nitrogen solubility in steel is analyzed and the test of adding nitrogen in alloy steel with various chemical composition (/% ： 0. 06 ~0. 36C, ≤3. 23Si, ≤2. 20Al, ≤ 9. 00Cr) by three kinds of nitrides-silicon nitride, manganese nitride and chromium nitride i…
A model of fluidized bed gas-solid reaction with simultaneous considering fluid, mass-transfer and chemical reaction of gas-solid two phases is established by using CFD fluent software and based on Eulerian multiphase fluid model. The coupling between gas-solid fluid, heat transfer, mass transfer and chemical reaction…
The dynamic recrystallization of steel 321 (/% : 0. 028C, 0. 69Si, 1. 21Mn, 0. 030P, 0. 001S, 17. 33Cr, 9. 19Ni, 0. 31Ti) has been studied by single pass hot compression with 0. 01 ~ 1 s-1at 900 ~ 1 200 ℃ oh a Gleeble-1500 thermal simulation machine. Results show that with higher deformation temperature and lower stra…
Test alloy Ni30Cr20 (/% : 0.035 〜0.045C, 0.28 ~0. 30Si, 0. 73 〜0. 75Mn, 0. 005 ~0. 007P, 0. 001 ~ 0. 002S, 19.40~ 19. 93Cr, 29. 75 ~30.35Ni, 0. 30 〜0. 36A1, 0. 03 〜0. 88Ti, 0.005 7 ~0,0205N) is melted by 150kg vacuum induction furnace to cast ingot with size (mm) 120 x230 x500. The calculation on thermodynamics condit…
The test H beam steel (/% : 0. 11C, 0. 25Si, 1.50Mn, 0. 006S, 0. 012P, 0. 038Nb) is melted by a 30 kg vacuum induction furnace and rolled to 15 mm plate. The continuous cooling transformation (CCT) curves of H-section steel 0. 11 C-0. 25Si，1. 50Mn-0. 038Nb are plotted by thermal dilatation curves at cooling rate 0. 1…
With using Kissinger equation in research field of mold powder, the activation energy for the crystallization of glassy state fluoride free titanium bearing mold powder in heating process (heating rate 5 〜30 K/min) and that for the crystallization of liquid state mold flux in cooling process (cooling rate 5 〜30 K/min)…
New LZ45CrV steel blooms (/% : 0. 43C, 0. 27Si, 0. 77Mn, 0. 007P, 0. 005S, 0. 55Cr, 0. 10V, 0. 10Mo) of 260 mm x260 mm and 280 mm x280 mm for heavy load railway axle at daye special steel are pilot-produced by the flow sheet 60 t UHP EBT EAF-LF-VD-6. 5 t ingot-850 primary mill rolling process. With process measures in…
Production flow sheet for 1 550 mm x230 mm slab of steel A36 bearing B (/% : 0. 16 ~0. 20C, 0. 10 ~0.25Si, 0. 20 〜0.40Mn, ≤0.030P, ≤0. 015S, 0. 010 〜0. 030Al, 0. 015 ~0. 025Ti, 0.001 0 ~0.001 8B) is hot metal pretreatment-210 t BOF-ladle argon blowing-LF-CC process. With the process measures including controlling [C]…
The studied steelmaking flow sheet for tyre cord steel is 150 t LD-RH-LF-soft argon blowing-CC process. The plasticity of non-metallic inclusions in steel is controlled by adding deoxidation reagent Si-Mn during LD tapping and adding low basicity top slag during LF refining to carry out steel-slag reaction. Results sh…
A primary test analysis on metallurgical functions of an 80-t single snorkel vacuum refining furnace has been carried out. Results show that the single snorkel vacuum refining furnace has the metallurgical functions including dehydrogenation ,denitriding, decarburizing, deoxidation, desulphurization, liquid heating by…
The change of structure and mechanical properties of Nb-Ti microalloying IF steel （/%: 0.006C, 0. 005Si, 0. 15Mn, 0. 008P, 0. 006S, 0. 039Al, 0. 01Nb, 0. 048Ti, 0.003 4N） during cold rolling process from 3. 98 mm hot rolled plate cold rolling to 0. 4 mm sheet （ deformation 40% to 90% ） by a four cold-rolling mill in l…
The production practice shows that for production of 0. 20% 〜0. 24% C ultra-low-sulphur steel, in conditions of 150 t EAF charging- 40% metal + quality low sulphur scrap, EAF end [C] 0. 03% ~0. 05%, EAF tapping average [S] 0. 046%, LF initial average [S] 0. 017%, the ≤0. 001% sulphur content in finishing steel is gott…
In the light of specific properties of austenitic stainless steel 304 (type Crl8-Ni8) and ferritic stainless steel 430 (type Crl7), a high-chromium ferritic stainless steel TTS433 (/%: 0.010C, 21Cr, 0.40Cu, 0. 25Nb, 0. 20Ti, 0. 012N) has been developed by testing and analyzing the effect of Cr, Cu, Nb, Ti element on p…
The test super-high strength weathering steel (/%: 0. 062 〜0. 065C, 0. 29 〜0. 30Si, 1. 23 ~ 1. 27Mn, 0. 49 -0. 52Cr, 0. 19 -0. 20Ni, 0. 29 ~0. 31 Cu, 0 ~0. 20Mo, 0. 035 ~0. 060Nb) is melted by a 50 kg vacuum induction furnace, forged to 60 mm x 60 mm billet, then hot rolled to 4 mm plate in laboratory by finishing rol…
The production process flow sheet for hard wire coil of steel 65C (/% : 0. 62 〜0. 70C, 0. 18 ~ 0. 28Si, 0. 55 ~0. 75Mn) is 120 t converter-LF-170 mm x 170 mm costing billet-rolling by high speed mill. The fracture cause of steel 65 C during ∅6. 5 mm hot rolled coil cold-drawing to ∅1. 85 mm wire has been analyzed by o…
The liquid flow field in mold of a 200 mm x 1 300 mm vertical slab caster and the effect of nozzle structure parameters (side hole size 40 mm x40 mm ~ 40 mm x80 mm, side hole angle +15° 〜-15°) with depth of submerged entry nozzle 115 mm and casting speed 0. 55 m/min on mold level fluctuation have been studied by using…
The volatilization characteristic of molybdenum trioxide ( MoO3) is the main reason led to low yield of Mo, while the Mo03stabilizing treated by CaCO3is an effective way to inhibit the volatilization of MoO3. The low-temperature solid phase reaction between MoO3and CaCO3has been studied according to thermodynamics and…
As the steel GCrl5 (1. 01%C, 1. 48% Cr) is melted in an 100 kg induction furnace up to 1 580 ℃, the metal liquid flows through furnace bottom liquid conduct nozzle and sprays in atomized chamber by high pressure nitrogen flow to atomize micron liquid drops and form deposition billet at bottom. The compared analysis on…
The effect of first roll and last roll position on plate flatness and surface residual stress of 22 mm Q345 steel plate (/% ： ≤0. 20C,≤ 0. 55Si, ≤1. 70Mn, 0. 02 - 0. 15V, 0. 015 ~ 0. 060Nb, 0. 02 ~ 0. 20Ti) during leveling process by a 9-roll straightener has been studied by established finite element model to get the…