最新刊期
卷 39 ， 期 4 ， 2018
- 摘要：The change of inclusions in the VOD + LF refining process of 304 stainless steel was studied. Before and after the beginning and end of the smelting process of the second VOD furnace with continuous casting and continuous casting, before and after the beginning and end of the weak agitation process of the LF furnace, mid-term tundish casting, the continuous casting billet is sampled, and the use of chemical composition analysis, metallographic observation and electron microscopy were used to detect it. It is found that the T[O] production process of 304 stainless steel gradually decreases with the process. The number of inclusions is on the rise before LF weak agitation. Then the process flow is gradually reduced. The morphology of inclusions is dominated by oxides of Cr2O3and MnO before the reduction process is carried out. After the reduction process, the main silicate inclusions are found. After the weak agitation of LF refining, the inclusions changed into spherical inclusions with calcium aluminate as the main inclusions. At the same time, the formation mechanism of inclusions was analyzed and studied.关键词：304不锈钢, VOD-LF-CC工艺流程, 夹杂物2|0|0更新时间：2026-01-21
- 摘要：The theoretic calculations were performed on reduction thermodynamic of molybdenum oxide powder based on different chemical composition and temperature of hot metal. The scale-up experiments were carried out at 80 t hot metal ladle and results indicate that yield of molybdenum will reaches over 98% by adopting such technical parameters as the size distribution of molybdenum oxide powder being；0. 10 - 0. 15 mm, injection time being 30 ~ 35 min, injection rate being 3, 0 ~ 3. 5 kg/min.关键词：氧化钼;铁水喷吹;钼合金化2|0|0更新时间：2026-01-21
- 摘要：For bearing steel in the cold and hot charging heating for laboratory thermal simulation, analyzed the level of casting billet grain size of hot charging by different heating temperature, and compared the grain size under the condition of cold charging, find the reasonable hot charging heating temperature. The results show that： when the hot charging temperature over 700℃, compared with cold charging, its casting billet organization of grain become bulky, grain size level between grade 1 ~ 2； According to the work site ,the before phase change cooling rate of casting billet as an average of 0.41 ℃/s, the hot charging temperature of GCrl5 bearing steel casting billet should be controlled less than 670 ℃.2|0|0更新时间：2026-01-21
- 摘要：The continuous cooling transformation (CCT) curves of S690 steel tube (/% : 0.15C, 0.25Si, 1.32Mn, 0.012P, 0. 005S, 0.20Cr, 0.04Al, 0.08V) with cooling rate 0. 01 ~30℃/s are measured and the effect of quenching at 890 〜970 ℃ and tempering at 600 〜690℃ on structure and mechanical properties of the steel has been studied. Results show that the phase transformation points of steel S690 seamless tube are Ac3828 °C , Ac1753 ℃, Ms 395 ℃, and the critical cooling rate of steel is 13 ℃/s, and there are ferrite, pearlite, bainite and martensite four transformation zone； with selecting quenching at 910 ~930 ℃, the structure of steel tube is uniform and fine with average grain size 13.9μm, and the steel has higher hardness with HRC value 42.5 ；with tempering at 615 - 675 ℃，the steel tube has uniform tempered sorbite structure and better comprehensive mechanical properties.3|1|0更新时间：2026-01-21
- 摘要：In order to understand the vaporization behaviors of Mn in medium and high Mn steel grades during vacuum treatment, industrial experiments and thermodynamic calculations were carried out. The results indicate that Mn vaporization would lead to an obvious loss of Mn in steel, and the vaporization is strongly influenced by the steel temperature, Mn content and vacuum pressure. With the increase of temperature and Mn content in steel, the saturated vapor pressure of Mn increases, leading to an increasing vaporization of manganese. Meanwhile, lower vacuum pressure would also result in a stronger vaporization of dissolved Mn into gaseous Mn. The mass transfer of Mn in liquid steel would not be the controlling step of the vaporization process of Mn during VD and RH vacuum treatment.关键词：中锰钢;高锰钢;气化挥发;二次精炼;真空处理4|0|0更新时间：2026-01-21
- 摘要：Metallurgical flowsheet of tested steel Y1Crl3 (/% ： 0.11C, 0.31 Si, 1.14Mn, 0.024P, 0.28S, 12.43Cr, 0.001 ICa, 0. 012A1, 0.008 40, Mn/S 4. 07) is 60 t AOD-LF-150 mm x 150 mm billet casting-rolled to Φ12 mm products. In original LF refining without adding Ca, the refining slag basicity is 1.7 ~ 2.1 and the T[O] is 0.012% ~ 0. 015% by only using Fe-Si to deoxidation, while in the improved, adding Ca process, after LF Fe-Si deoxidation adding the Al wire is supplied again to deep deoxidation, the T[O] is 0.007% ~0. 010% , and the Ca wire is fed to modify the inclusions in liquid. Results show that with adding core calcium wire the long stripe sulfide is modified to spherical or spindle sulfide, the max length of sulfide in products reduces to 100 μm from original 160 μmμm, the ratio of spindle sulfide with length/width ≤3 increases to 72.09% from original 52.90% markedly to improve the cutting performance of products.2|0|0更新时间：2026-01-21
- 摘要：With using Cr, V microalloying technology the Φ 14 〜15 mm coil of steel SWRH82B (/% : 0. 79 ~ 0. 82C, 0. 15 ~0. 35Si, 0. 60 ~0. 90Mn, ≤ 0. 025P, ≤ 0. 006S, ≤ 0.015As, 0. 26 ~0. 32Cr, 0.04-0.07V) with tensile strength ml 180 MPa has been developed. The 中14 〜15 mm coil of steel SWRH82B is produced by 100 t BOF-LF refining-160 mm x 160 mm billet casting with mold electromagnetic stirring-billet slow cooling-high speed wire-rod rolling- Stelmor wind cooling process at Shuigang, the sorbite content in structure of coil is up to 95%. The tensile strength of coil is 1 180 ~ 1 270 MPa and the reduction of area of coil is 27. 0% ~37. 5% to meet the requirements of large size and high strength steel strand for mine.4|0|0更新时间：2026-01-21
- 摘要：The Φ 110 〜260 mm products of steel AISI4145HM (/% : 0.44 -0.46C, 0. 21 〜0. 23Si, 1. 32 ~ 1.33Mn, 1. 18-1.20Cr, 0. 30 ~0. 31 Mo, 0.16 ~0.17Ni, ≤ 0.012P, ≤ 0.004S, ≤ 0.05Cu, 0. 15 ~0. 35Als) is produced by hot-metal + scrap- 100 t EAF-LF-VD-0500, 600 mm round bloom casting-walking beam reheating furnace- 950mm rolling mill- slow cooling- annealing flowsheet, in the special steel division new district of Laiwu steel. With the process measures including controlling EAF end [C]≥0.15% and [P]≤0.008% , pre-deoxidation and alloying in tapping, using LF high aluminium refining slag (30% ~40% Al2O3) and feeding 0. 45 kg/t calcium wire, gradient soft blowing after VD, controlling overheating extent of liquid in tundish 12 - 25℃ ，casting speed 0. 25 〜0. 35 m/min, whole course shielding casting, using M-EMS and F-EMS, slow cooling after rolling and annealing, the macro structure of produced casting bloom is better with center porosity and center line shrinkage ≤ rating 1.0, crack and subskin blowhole rating 0, each inclusion rating ≤ 1. 5, total inclusions rating ≤ 7. 0, the each index of steel products all meets the requirement of specification.2|0|0更新时间：2026-01-21
- 摘要：The reason of oxide scale of continuous casting slab in 22SiMn2TiB steel cannot be completely removed was analyzed by SEM, EDX and XRD. The results show that silicon element (0.70% 〜1. 00 %) of 22SiMn2TiB steel is easy oxidation ,and form the phase of Fe2SiO4(fayalite ) under the condition of primary heating process. The form of Fe2SiO4(fayalite) will be changed after high-pressure water descaling, like anchor, FeO will be packed by it, leading to the increment of adhesion force between inner layer oxide scale and steel matrix, which is the reason for the incompletely removed of oxide scale of continuous casting slab. According to the analysis results, we have optimized heating process of continuous casting slab, the temperature of continuous casting slab was elevated 1 250 ~ 1 300℃, thus, the temperature of continuous casting slab was controlled above 1 173 ℃ after high-pressure water descaling, leading to the decrease of adhesion force between inner layer oxide scale and steel matrix, the question of incompletely descaling of continuous casting slab in steel 22SiMn2TiB will be effectively resolved.2|0|0更新时间：2026-01-21
- 摘要：Production flowsheet of steel 420M (/% ： 0.18 〜0.23 C, ≤1.00Si, 0.25 ~ 1.00Mn, ≤0.020P, ≤ 0.005S, 12.0 ~ 14.0Cr, ≤ 0.50Mo, ≤ 0.50Ni) is 20 t EAF-AOD-LF-3 t ingot-Φ190 mm tube shell-Φ193 mm x29 mm shell-rolled by ASSEL mill to Φ158.75 mm x25.4 mm tube. Because of poor hot plasticity of steel 420M the piercing point consumption is large in piercing process, the inner wall of shell easily produces overlap and the tube surface cracks easily form after rolled by ASSEL mill. With optimized process including decreasing tube shell heating temperature from original 1 240 ~ 1 280 °C to 1 150 ~ 1 250 °C，using bearing molybdenum piercing point to replace medium carbon CrMo steel piercing point, improving tube rolling parameters and slow cooling or annealing after rolling the surface quality of tube improved markedly and the qualified rate of first nondestructive test increases from original less than 50% to more than 95% .2|0|0更新时间：2026-01-21
- 摘要：The effect of continuous casting process parameters including M-EMS stirring frequency, casting speed, superheat and secondary cooling water ratio on the center carbon segregation of SWRH82B billet were investigated. The results indicated that low center carbon segregation index could be obtained in lower M-EMS stirring frequency with constant stirring current 300 A, center carbon segregation could be improved by increasing secondary cooling water ratio, but it would get worse with the further increase of secondary cooling water ratio; secondary cooling water ratio of 0. 75 L/kg was suitable for casting speed of 1.8m/min while 0. 80 L/kg was proper for 1. 9 m/min. In addition, superheat between 20 ~ 30 °C had negligible effect on the carbon center segregation.关键词：SWRH82B钢,160 mm X160 mm连铸坯, 中心碳偏析, 拉速;二冷比水量, 过热度2|0|0更新时间：2026-01-21
- 摘要：The chemical composition of X70QS seamless steel tube was designed according to the API 5L standard. CCT curve of test steel was measured using thermal expansion instrument, the results show pearlite disappeared and bainite content was more when the cooling rate reached 20 龙/s, the appropriate cooling rate of quenching is more than 20 °C/s. Mass production of X70QS seamless steel tube was carried out using the process of “ 100 t EAF—LF + VD—CCM― ACCU- ROLL machine-quenching and tempering". In the production process, controlled S content, non-metallic inclusion, casting billet segregation. Also solved the problem of sticking steel in piercing. The results show the microstructure of X70QS seamless steel tube is ferrite and tempering bainite, grain size is not smaller than 8. 5, the total grade of all kinds of inclusion is not bigger than 2 ； the mechanical performance and H2S resistance performance meet with the requirement of API 5L standard ； the ductile-brittle transition temperature is below -60 ℃ .2|0|0更新时间：2026-01-21
- 摘要：The steelmaking process flowsheet of tested sulphur bearing non-quenching and tempering steel 36MnVNS4 (/% : 0. 36C, 0. 66Si, 1. 00Mn, 0. 010P, 0. 045S, 0.26V, 0. 011 ON) is hot metal + scrap- 70 t EBT EAF-LF-square billet casting-rolling. The effect of LF both slag series- 19. 82% Al203( CaO)/( SiO2) = 2. 64 and 14. 63% Al2O3(CaO)/( SiO2) =2. 15 on oxygen content in liquid after soft argon blowing, S yield after feeding S wire, and compound and morphology of inclusions in steel has been studied. Results show that refining by high basicity white slag is available to decrease the oxygen content in steel, but it is unfavourable to stabilize the sulphur content in steel； decreasing the refining slag basicity ( CaO)/( SiO2) from 2. 64 to 2. 15 is favourable to stabilized control the sulphur content in steel, and the yield of sulphur increases from 35% to 75% ； with both refining process the distribution, morphology and ingredient of inclusions in steel are basically the same. By calcium treatment in ladle the long strip MnS inclusions modify to spheroid compound inclusions.2|0|0更新时间：2026-01-21
- 摘要：The IF steel that produced in Hanbao steelmaking plant was followed the procedure of combined blowing converter-RH refining-slab continuous casting. The number, size, composition and source of inclusions in different positions of the slab were systematically analyzed by means of SLIME, electrolytic extraction, filtration and separation, SEM and EDS. The results showed that the total oxygen and nitrogen contents of the head slab at 1. 5 m are 70 x 10-647 x 10-6respectively, which is significantly higher than that of the mixed and the normal slab. The number of inclusions at 2. 5 m of head slab is 22. 1 mg/10 kg, which is 27 times as high as that of the normal slab. The main composition of the inclusions in the slab is the SiO2inclusion rich in K and Na, which is caused by the mould slag, and the size is mainly within 300 μm. It is necessary to optimize the composition of the slag, increase the viscosity to (0. 5 ±0. 1) Pa・s, improve the slag content of Al203and other means to reduce the risk of slag entrainment. By decreasing the amount of head and tail slab removal and flame cleaning, the degradation rate of hot strip caused by inclusions defects in deep drawing steel decreased from 0. 3% ~ 0. 4% to below 0. 2%.3|0|0更新时间：2026-01-21
- 摘要：Surface crack on micro-alloyed steel plate produced by hot charging process was investigated by means of metallographic analysis, energy spectrometer analysis and contrast test of HCR and CCR. The results show that the main factors of surface crack on micro-alloyed steel plate produced by hot charging process are not the cracks on slab but the precipitation of a large of fine carbon and nitrogen compound at the boundary of the austenite grains,which decreases the strength of the grain boundary sharply.关键词：Nb-V-Ti微合金钢;红送;表面裂纹2|0|0更新时间：2026-01-21
- 摘要：The microstructure, hardness and corrosion resistance of mold steel U338ESR for plastics treated at various solution and aging temperatures, were investigated by means of optical microscope (OM) , scanning electron microscope (SEM) , transmission electron microscope (TEM) , hardness tester and electrochemical analyzer. The results showed that with the increase of solution temperatures, which were at the range of 1 000 ~ 1 090 °C , alloying elements and NbC dissolved more into matrix, the uniformity of microstructures and the amount of martensite increased after water cooling, leading to the increase of hardness and the enhancement of corrosion resistance. When the aging temperatures were at the range of 300 -450 °C ，with the increase of temperatures, small Cu-rich phases nucleated and formed coherent bcc structure with the matrix and the coherent strain energy increased gradually, resulting in the increase of hardness and the decrease of corrosion resistance ； when the aging temperatures were at the range of 450 〜600°C , with the increase of temperatures, the Cu-rich phases transferred from coherent to incoherent state gradually, the coherent strain energy decreased, resulting in the decrease of hardness and the enhancement of the corrosion resistance. Reversed austenite formed at 600 °C, enhanced corrosion resistance further.2|0|0更新时间：2026-01-21
- 摘要：Tests were annealed under different temperature, for purchasers word-hardness( ≤210 HBW) special requirements satisfaction to determine the eptimal annealing process with the help of metalloscope to analyze annealing shape of 6CrW2Si under different temperature. The result showed that 6CrW2Si annealing hardness was connected with temperature ,with the increase of annealing temperature, the hardness dacreases first and then increases. When annealing temperature is 810℃ , the average hardness of steel products is the lowest( adout 193 HBW) and the structure is uniform spheroidized pearlite.关键词：退火温度;球化组织;硬度;6CrW2Si钢2|0|0更新时间：2026-01-21
- 摘要：The die steel 4Cr5MoSiV1 was produced with the path of hot metal + scrap→100 t EAF→double LF→ double VD→ round billet continuous casting (section Φ 500 mm)→ step reheating furnace→ 950 rolling mill,in the special steel division new district of Shandong Steel. There are defects in the detection of individual batches die steel 4Cr5MoSiV1. By using the ultrasonic testing to locate the defect location, and analyzing with the way of Metallographic analysis and scanning electron microscopy (SEM) , finally confirmed the center defect and the rolling compression ratio small are the main reasons of the testing substandard batch of steel 4Cr5MoSiV1, and the corresponding improved measures are put forward.关键词：4Cr5MoSiV1;探伤;分析;工艺改进4|0|0更新时间：2026-01-21
- Technical support is provided by Beijing Founder electronics co., LTD 鄂ICP备2022000839号
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
- Total Visits：35684
0