Materials Literature
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Effect of casting speed, super-heating degree of liquid steel in tundish on middle crack of cast blank and effec-t of mold cooling water technical parameters on shell thickness and
Test high speed steel M2 ( % : 0. 85C, 5. 92W. 4. 74Mo, 3. 86Cr, 1. 84V) was melted by 25kg vacuum induction furnace and ingot was cast bv sand mould. The effect of 0 ~ 1. 3% Al on stiucture of as-cast steel has been studied. Results showed that added 0. 6% Al was available to fine the ledeburite network and improve t…
The GCrl5 bearing steel is produced by hot metal desulphurizing - 150 t LD - LF + RH - TB refining - 350 mm x 470 mm bloom concasting flow sheet at steelmaking plant, Benxi Steel. With the operation practices including using quality hot metal (0. 000 2Ca, 0. 002 7Cu, ≤0. 001 As, ≤0. 001 Sn, ≤O.OOlSh, 0. 002Pb) , contr…
A study on stress-strain of a microalloyed steel (% ： 0. 055C, 1. 49Mn, 0. 44Cr, 0. 03Nb, 0. 05 V, 0. 03Ti) produced by Compact Strip Production (CSP) process has been carried out from the points of view of dynamic recovery and the steady stress of stress-strain curves of test steel in hot deformation process was dedu…
Main ingredients of test mould powder were ( % ) 35. 46CaO, 32. 84SiO27. 87Al2O3,3. 04MnO ,8. 48Na2O, 7. 13F, 2. 6C. Samples of mould molten slag and slag film during casting of stainless steel !Crl7 were taken to study the change of ingredients and properties of molten slag and performance of slag film. Results showe…
With prototype of tundish for concasting slab 1 500 mm x 250 mm and using geometric similar ratio 1/3, the water modeling test of tundish bottom gas blowing has been carried out by self-made porous plug. Results showed that in tundish with gas curtain the inclusion removed by mechanisms of Stokes floating, absorption…
A water model with linear scale 1 ; 3. 27 for a 70 t ladle RH unit has been established by using flow rale methed to measure RH circulation rate. RH circulation rate of liquid steel in real process condition and effect of parameters such as blow rate in up-gas tube, inner diameter of orifice T blowing up-gas traveling…
A model of Laval nozzle has been established by definite proportion according to oxygen nozzle used in actual production. With using commercial software Fluent 6. 2, k-£ model and coupling implicit expression solution, the a- daptability of different math models in nozzle was discussed, it was obtained the RNG k-£ mod…
Effect of Ti content (0. 35% ~ 1. 10% ) on structure and mechanical properties at ambient and 350 °C for nickel base alloy Inconel 690 (% : 0. 034 〜0. 036C, 29. 40 〜29. 68Cr, 9. 11 〜9. 22Fe, 0. 34 〜0. 36 Al, 0.004 4 〜 0. 004 5N) solid solution treated at 950 〜1 100℃ , water quenched and aged at 715 °C for 15 ~ 100 h,…
Based on analogy theory, the physical behavior of inclusion in liquid steel of ladle with argon stirring lias been studied by using 1; 9 water model and the effect of gas injecting time 2 ~28 min and gas flow-rate ( 1. 19 ~4. 75) x 10-2m3with different bottom blowing position on inclusion removal was tested. Results s…
According to analysis on cold upsetting crack of 0. 45C steel φ10 mm rolled products produced by 40 t LD- ladle argon blowing- CC- high speed rod mill process flow sheet at New Fushun Steel, it was obtained that the inclusions Al2O3MnS and the lamellar pearlite in steel were main reason to form cold upsetting crack. W…
According to prototype 25 t tundish, the liquid flow field and the removal of inclusions in an approximate rf-shape tundish with three kind卜 of weirs in 4-strarid easting have been analyzed by using experimental similarity ratio λ= 1 ： 2. 3 uatrr model. Results showed that by using original weir, there was a great dif…
Effect of cooling rate after rolling (20 ~0. 5 °C /s) , initial pass temperature of finishing rolling ( 1 000 ~ 900 °C ) , last pass temperature of finishing rolling (860 ~750 °C ) and coiling temperature (630 ~ 500 °C ) on niicrostnie- ture of pipeline steel X65 (0. 08% C, 1. 38% Mn, 0. 032% Nb, 0. 041 % V, 50 x 10-6…
Studied maraging stainless steel- 0. 007C, 13. 44Cr, 7. 47Ni, 4. 15M(), 4. 21 Co. 1. 84W . (). 12Ti was melted by a 15 kg vacuum induction kirnace and reinelt-relininei] by a vac mini e(>nsunial)le elrctrodr luriKice. rfhe 450 ~ 550 ℃ aging hanlvning cunes φ12 mm rolled samples solution-treaieH ai 1 100 X for 1 h was…
Precipitates in Nb-Ti microalloying ultra-low carbon bake hardening steel ( % : 0. 002C, 0. 01 ~0. 02Nb, 0. 01 ~0. 02Ti, 0. 002 8 ~0.004 2N) have been studied and expressions for solution C content in test steel were established by quantitative phase analysis. Results showed that increasing calculated value of solutio…
With gear steel 20CrMnTi producing by 80 t LD-LF-CC process, as [Al] s decreases from 0. 030% to 0. 015% , the production cost per ton steel shall be decreased by 25. 8 yuan. In order to un-influence the cleanliness of liquid steel, in LD tapping the slag was strictly stopped, the 2 kg/t steel-clad aluminium was added…
In general, the section sizes of ESR furnace ingot for heavy slabs are (mm): (400 ~ 950) x (800 ~ 3 200) with weight 5 ~ 70 t. The furnace type of ESR Furnace for heavy slabs and the process characteristics such as control of hydrogen content in steel, ingot segregation and surface quality are analyzed in this paper.…
Thickness, uniformity and mechanical properties of slag skin are main factors to influence the surface quality of continuous withdrawing electroslag remelting ( ESR) ingot. Thin and homogeneous slag skin is a kev to get ni(*e surface quality of ESR continuous casting ingot. The effect of current density distribution i…
Structure and mechanical properties of maraging steel 00Ni14Cr3Mo3Ti (% ： 0. 002C, 14. 06Ni, 3. 19Cr, 3. 06Mo, 1. 32Ti) with 750 ~ 1 050 °C solution treatment have been studied. Results showed that with ≤900 °C solution treatment the austenite grain size and strength of steel wasn't obvious change, as solution tempera…
Parallel convex strip defect at surface of hot galvanized steel plate ( % : 0.001 5 C, 0. 004P, 0. 005S, 0. 02A1, 0. 04Ti) has been studied by SEM and EDS, and it was obtained that the defect included black spot, microcrack, conchiform pattern, scratch trace and scale. Analyzed results showed that higher Sb content in…