Materials Literature
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Based on similarity theory, the effect of bottom gas blowing rate on flow characteristics of fluid in ladle including mixing time, liquid level fluctuation, bare area diameter and floating time of inclusions has been studied by using 1 : 5 and 1 ： 5.5 model for an 130 t and an 160 t ladle at Frist Heavy Machine Indust…
The thermogravimetry (TG) -differential scanning calorimetry ( DSC) analyses on 4 kinds of electroslag for remelting- AH-6 (70% CaF2), M-l (42%CaF2), L-3 (15% CaF2) and F-2 (free CaF2) have been carried out by using TG and DSC, the structure of melting slag at elevated temperature is measured by using X-ray diffractio…
The structure and hardness of steel 6Cr15Mo (% : 0.59C, 14. 96Cr, 0. 52Mo, 0. 22V, 0.004 6 N) quenched at 1 000 ~ 1 100℃ and the structure, hardness and impact toughness of that steel quenched at 1 080 °C + tempered at 100 ~700 °C have been studied. Results show that the hardness of steel 6Cr15Mo quenched at 1 080 ℃ h…
The effect of magnesium on modification of non-metallic inclusions in steel SPHC (0. 065% C, 0. 025 % Al) is analyzed by thermodynamic calculation, and combined with commercial test by using an 80 t top and bottom combined blown converter flow sheet, the mechanism for influence of magnesium on inclusions in steel SPHC…
With a 230 mm x2 150 mm slab caster at steelmaking works as an object of study, the effect of cast speed (0. 8 ~2. 3 m/min) , immersion depth of submerged nozzle (100 -200 mm) and slab width (1 100 ~2 150 mm) on heat transfer and solidification of liquid at action of flow field in mold has been analyzed by 3 dimension…
According to the 60 t LD-LF-VD-CC production process at Shijiazhuang steel, the average total oxygen content (T[O] ) in bearing steel GCrl5 decreases obviously by improving a series of process control technology such as tapping at condition of high carbon and low oxygen content in steel, controlling LD tapping slag am…
The effect of five different bottom gas blowing scheme on flow characteristics of liquid steel and inclusions removing from steel in tundish has been studied by using 1: 3 water model-testing for a 40 t tundish to measure the flow field of liquid in tundish for 6 strands billet casting. Results show that the residence…
Test to melt weathering-resisting steel SPA-H ( % : W0. 12C, 0. 30 ~ 1. 25Cr, 0. 25 ~ 0. 55Cu) by both processes of 60 t converter (liquid temperature 1 653℃ )- LF refining (slag basicity 2. 5 ~3. 0, feeding Al wire, Ar stirring) and hot metal pretreatment ([S] ≤0. 010% ) -60 t converter (liquid temperature 1 670 °C ,…
Effect of finishing temperature (750 ~900 °C ) and product size (Φ12 mm and Φ5. 5 mm) of rod on precipitation of carbide network in bearing steel GCrl5 has been studied. Results show that as railing ① 12 mm rod, with finishing temperature 800 °C , the rating of carbide network is minimum i. e. 1. 5, with decreasing fi…
The reaction of reduction of Mo03with different adding method by 500 g Fe-1. 80% 〜3. 50% [ C ] melts with nitrogen protective atmosphere at 1 300 ~ 1 500 °C has been studied. Results show that at W 1 400 °C with free slag condition, the reduction rate of Mo03by feeding MoO3powder is faster than that by adding Mo03pell…
The effect of 0. 008 7% 〜0. 150 0% N on tensile and compression properties of hot-rolled steel 0Crl8Ni9N (% ： 0.044 〜0.049C, 0.41 〜0.51Si, 1.46 ~ 1.52Mn, 17. 92 ~ 18. 15Cr, 9.09 〜9.24Ni, 0.01 〜0.03Ti) with strain rate 5 x 10-3s-1and 1 s-1at 800 〜130 0 °C has been studied by using Gleeble 1500 thermal simulation machin…
The pass reduction (15% ~70% ) and temperature (850 ~ 1 150 °C ) on recrystallization fraction of tiefor- ming austenite of steel SCM435 (% : 0. 35C, 1. 05Cr, 0. 22Mo) has been studied by using stepped form stock rolling method, and the recrystallization diagram of the steel is got. Results show that with increasing d…
Steel 26CrMoNbTiB is melted by 45 t EAF-LF ( VD) -Φ80 〜180 mm tube billet HCC flow sheet. Test results of cleanliness of the steel at each melting process showed that the oxygen content in steel after LF-VD is (8 ~ 18) x 10-6with lowest average inclusion amount i. e. 2. 31 inclusions/mm2and that is 3. 66 inclusions/mm…
Bulging of 165 mm x 280 mm and 165 mm x 240 mm blooms easily occurs for partly R6 and R8 caster without secondary cooling pinch roll section casting as increasing cast speed. Based on analysis and test, it is obtained that with adjusting and increasing water rate at narrow side, the bulging of cast bloom improves obvi…
3-demensional thermodynamic coupling simulation for continuous rolling process of Φ100 mm round steel 42CrMo by 200 mm x 200 mm cast bloom has been carried out by using MSC. Marc finite element simulation software. As the plastic stain at round comer of stock in pass is larger and the deformation is gradually from sur…
The 50% hot deformation test on pipeline steel X52 (L360) ( % ： 0. 08 C, 0. 20Si, 0. 93 Mn, 0. 024Als, 0. 02Nb, 0. 02Ti) with strain rate 0. 01 ~ 10 s-1at 950 ~ 1 200 °C was carried out by Gleeble-3500 thermal simulator to get true stress-strain curves. Based on regression analysis, the activation energy and equation…
Structure of heat-resistant steel 1 Crl2Ni3Mo2VN quenched at 1 040 T for 1 h oil cooling, furnace cooling (5 T/min) , 1 °C./min and 0. 5 °C/min cooling and mechanical properties of the steel quenched at 1 040 °C for 1 h with different cooling rate + tempered at 565 °C for 2 h have been studied. Test results show that…
The continuous cooling transformation (CCT) curves of 18 mm plate of X80 pipeline steel (% : 0. 05C, 0. 17Si, 1.78Mn, 0. 40Mo, 0.08Nb, 0.03V, 0. 03Ti) with 1 s-1and 40% deforming at 1 100°C , then 5 T/s cooling to 850 °C , 1 s-1and 40% deforming and 1 ~40 °C/s cooling to ambient temperature were determined by Gleeble-…
Effect of 60% - 80% cold reduction on structure, texture and mechanical properties of 1. 4 ~0. 7 mm cold rolled deep-drawing strip steel from 3. 5 mm CSP (Compact Strip Production) hot rolled plate has been studied. Results show that with increasing cold reduction to 80% from 60% , the beginning recrystallization temp…
The key technology for controlling the oxygen content in gear steel is analyzed including SiO2content in refining slag, (CaO)/( A12O3) , (FeO + MnO) , RH, Ar stirring and concasting process. Combined with process conditions at Vanadium Recovery and Steelmaking Plant, Panzhihua New Steel-Vanadium Co Ltd, with the proce…