最新刊期
卷 45 ， 期 5 ， 2024
- 摘要：3% Cr roller steel produced by two smelting process routes of the electroslag remelting and the rare earth refining respectively was studied， the chemical composition difference， microstructure， the characteristics of inclusion， as well as mechanical properties for these two roller steels were comparatively investigated by SEM， EDS， ASPEX etc characterization means and experimental methods of electrolysis extraction， tensile， impact tests etc . The results showed that w［Ce］ ≤0.01%， w［Al］ =0.022%， and w［Al］ =0.018% in the rare earth refined roller steel， and the two processes have similar control levels on the impurity elements in the steel. After heat treatment with the same process， there was similar microstructure of the tempered sorbite in these rare earth refining and electroslag remelting roller steel， and microstructure uniformity of roller body made by two processes was almost consistent. The inclusions in the rare earth refined roller steel are mainly ellipsoidal CeAlO3 and Ce2O2S the average size is about 4.17 μm， and the area percentage is about 0.006 6%；Meanwhile some irregular Al2O3 particles about 3.88 μm in average diameter in the electroslag remelting roller steel were also observed about 0.008 1% in area fraction. Moreover， the yield strength of rare earth refining roller steel were few different from those of the electroslag remelting roller steel. But the elongation， area reduction and impact toughness of the rare earth refining roller steel were higher than those of the electroslag remelting roller steel.关键词：Roller Steel;Rare Earth Refining;Electroslag Remelting;Non-metallic Inclusion;Mechanical Properties278|14|0更新时间：2025-05-09
- 摘要：As a neutron shielding material for spent fuel storage， Ni-Cr-Mo-Gd alloy has broad application prospects， but it is prone to cracking during thermal working. In order to optimize the hot deformation process parameters of the alloy，this paper focuses on the study of Ni-Cr-Mo alloy， investigating the microstructural changes induced by the addition of Gd. Isothermal hot compression experiments were conducted at deformation temperatures of 1 000 ℃-1 200 ℃ and strain rates of 0.01 s-1-5 s-1 to calculate the relevant material constants and the activation energy for thermal deformation. Thermal working map was established to determine thermal deformation window， while the influence of Gd element on the thermal deformation behavior of the alloy was analyzed in conjunction with the microstructure. The results indicate that the addition of 1.2% Gd to the Ni-Cr-Mo alloy reduces the deformation activation energy from 472.15 kJ/mol to 422.9 kJ/mol. This results in higher energy consumption efficiency during thermal deformation and more comprehensive microstructure evolution. The plastic instability zone gradually shifts from high to low temperatures， expanding the safe deformation zone of the alloy at low temperatures of 1 000 ℃-1 060 ℃ and low strain rates of 0.01 s-1-0.32 s-1. Optimal thermal deformation zone for alloy is determined to be a true strain of 0.5 at temperatures of 1 113 ℃-1 164 ℃ and strain rates of 0.01 s-1-0.2 s-1. Gd precipitates as the intermetallic compound GdNi5 at grain boundaries or dendrite interfaces. The presence of GdNi5， as a hard brittle phase， leads to significant strain accumulation during the thermal deformation process， resulting in higher stored energy in the microstructure， thereby promoting recrystallization of the surrounding deformed grains and reducing the residual strain in the microstructure.关键词：Neutron Absorbing Material;Vacuum Sensing Melting;GdNi5 Phase;Deformation Activation Energy;Thermal Working Map;Dynamic Recrystallization;Thermal Deformation Behavior283|15|0更新时间：2025-05-09
- 摘要：The cross section and longitudinal section microstructure morphology of two different Si contents hot-rolled wire rods were observed using scanning electron microscopy and energy spectrum （EBSD） instruments. The tensile properties of the hot-rolled wire rods were tested using a universal testing machine. The results show that with the increase of Si content， the undercooling of pearlite transformation increases， and the size of pearlite colony and pearlite interlamellar spacing in hot-rolled wire rods decrease.The Si element causes the Mn element to segregate in the cementite， increasing its stability and reducing the spheroidization of the cementite lamellae. The Si element weakens the texture strength of the pearlite in the transverse and longitudinal sections of the wire rod， leading the pearlite structure more uniform and the orientation more random. The Si element can greatly improve the strength of hot-rolled wire rods and finished steel wires， while slightly improving plasticity. The tensile strength of low Si wire rod is 1 134 MPa， and the uniform elongation is 7.1%； The tensile strength of high Si wire rod is 1 263 MPa， and the uniform elongation is 7.3%. The tensile strength of the low Si wire is 1 937 MPa， and the uniform elongation is 2.2%； The tensile strength of the high Si wire is 2 106 MPa， and the uniform elongation is 2.3%.关键词：Cable Steel Wire Rope;Hot-Rolled Wire Rod;Si Element;Pearlite;Microstructure and Mechanical Properties152|3|0更新时间：2025-05-09
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Effect of Boron on the Microstructure and Strength-Toughness of Fe-Cr-B-C Alloy after Heat Treatment
摘要：In order to explore new methods for improving the strength-toughness matching of Fe-Cr-B-C alloy， the effect of B content on its microstructure， hardness， and impact toughness after heat treatment were investigated. The results showed that after air-cooling quenching at 1 050 ℃， a large amount of extremely fine secondary carbon-borides precipitated in the interdendritic region of low-B （0.000 6%） alloy， and fine dispersed secondary carbon-borides precipitated in the matrix of intermediate-B （0.51%） and high-B （2.89%） alloys. As the B content increased， the size of secondary carbon-borides increased but the particle density decreased. After air-cooling quenching at 1 050 ℃ plus tempering at 500 ℃， the number of secondary carbon-borides increased and the precipitation region expanded. For the low-B alloy， the dendrite arm was composed of coarse lath-like martensite， and the interdendritic region was composed of acicular martensite， high-density secondary carbon-borides and a small amount of solidification precipitates. For the intermediate-B alloy， the microstructure was composed of acicular martensite matrix with dispersed secondary carbon-borides， and network boron-carbides. For the high-B alloy， the microstructure was composed of γ matrix with a small amount of dispersed secondary carbon-borides， and denser network boron-carbides. The low-B alloy possesses the highest impact toughness and moderate Rockwell hardness. The intermediate-B alloy possesses the highest Rockwell hardness and moderate impact toughness. The high-B alloy possesses the lowest Rockwell hardness and impact toughness. Compared with the as-cast state， the solidification precipitates dissolved slightly after the quenching and tempering treatment， which resulted in the local rupture of netlike boron-carbides in intermediate-B and high-B alloys. Thus， after air-cooling quenching at 1 050 ℃ plus tempering at 500 ℃， the impact toughness of intermediate-B and high-B alloys improved obviously.关键词：Fe-Cr-B-C Alloy;Boron;Heat Treatment;Microstructure;Secondary Carbon-Borides;Strength-Toughness2|0|0更新时间：2025-05-09 - 摘要：With the manufacturing process by vacuum induction， electroslag remelting， vacuum self consumption， homogenization heat treatment， forging， hot extrusion， cold rolling， and heat treatment. we can get two types of GH4169 alloy pipes with Nb content of 4.90% and 5.30% respectively. The effect of Nb content on the microstructure and properties of GH4169 alloy pipes was studied while other components remained basically the same. The results show that under the same heat treatment process， with the increase of Nb element content， the Nb content becomes higher and the grain size becomes smaller； At 200 ℃ and room temperature with the tensile strength and yield strength both increase with the increasing of Nb content， And the content of precipitates in GH4169 alloy pipes also increases. Under different solid solution heat treatments and the same aging heat treatment process， the grain size of GH4169 alloy pipes is in the range of 4.0-7.0. The smaller the grain size， the higher the tensile strength and yield strength of the pipes； At the same grain size， the higher the Nb content， the higher the tensile strength and yield strength of the pipe.关键词：GH4169 Alloy Pipe;Nb Content;Grain Size;Tensile at Room Temperature;High Temperature Tensile at 200 ℃;Precipitated Phase4|1|0更新时间：2025-05-09
- 摘要：The 125ksi grade 15Cr super martensite stainless steel exhibits excellent high strength and high toughness matching， and corrosion resistance to CO2， which making it a promising material for oil well pipes exceeding a depth of 7 000 m. This paper comprehensively discusses the control technology for achieving high strength and high toughness in 15Cr super martensite stainless steel tubing through composition design， production process optimization， and microstructure regulation. In terms of composition control， a δ ferrite-free composition design is employed with a chromium content （w［Cr］） of 15%， nickel content （w［Ni］） ranging from 6.5% to 7%， carbon content （w［C］） between 0.01% and 0.03%， and copper content （w［Cu］） varying from 1.25% to 1.5%. The appropriate combination of chromium and nickel elements plays a crucial role in reducing the δ ferrite content， while the optimal balance between carbon and copper contents is key to obtaining superior mechanical properties characterized by high strength and high toughness. Regarding the smelting process， this study investigates the influence of impurity elements on electric furnace steel. The results show that vanadium （V）， nitrogen （N）， and aluminum （Al） impurities increase the hardness of the 15Cr steel alloy.and raise the tempering temperature to 550 ℃-575 ℃， which can reduce the hardness and ensure the toughness. Concerning hot processing and molding techniques， the dynamic recrystallization behavior are obtained through hot deformation tests conducted on the15Cr steel alloy. The optimum hot perforation deformation temperature for seamless pipe manufacturing falls within 1 100°C to 1 150°C as it facilitates grain refinement via fine recrystallized grains formation. Microstructure regulation involves determining an appropriate normalizing temperature during heat treatment processes. The research results suggest that normalizing at temperatures ranging from 950°C to 980°C helps maintain grain size without significantly grown， while the match of high strength and high toughness can be obtained.关键词：125ksi Steel Grade;Super Martensitic Stainless steel;Composition Design;Strength and Toughness Matching6|2|0更新时间：2025-05-09
- 摘要：In order to solve the problem of poor mirror polishing effect of steel used in plastic die， the polishing efficiency of die steel is improved by optimizing smelting process. The results showed that the mirror effect was closely related to the purity of steel. From the electric arc furnace burden structure， deoxidization system， LF refining furnace argon blowing control， high vacuum degree cycle of VD vacuum furnace and mold casting process optimization， more comprehensive improvement measures were taken， that is， increasing the use of DRI， using silicon predeoxygenation， optimizing the argon blowing control of steel ladle bottom and improving the high vacuum cycle of VD.The effective size of inclusions decreased from 27.93 μm to 23.65 μm before optimization. The number density of inclusions decreased from 256 / cm2 to 176 / cm2， and the number density of inclusions decreased by 31.2%. The total amount of B and DS and TiN inclusions was controlled， and the customer satisfaction of polishing performance was recognized.关键词：Die steel H13;Polishing;Nitrogen Content;Inclusions;Number Density333|1|0更新时间：2025-05-09
Product Research and Development
- 摘要：The effects of adding different ratios of DRI （direct reduced iron） to Consteel EAF on smelting technical and economic indicators， molten steel cleanliness， and the ingredients of acr furnace final slag were studied by conducting experiments on all scrap steel and adding 10%， 20%， and 30% ratios of DRI. And based on the experimental results， the key points of smelting control such as adding metal materials， blowing oxygen and carbon， adding slag making auxiliary materials， and slag discharge were analyzed.The results show that as the proportion of DRI added increases， the consumption of electricity， steel material， slag making auxiliary material， and slag amount gradually increase. When the proportion of DRI addition is 30%， due to the large amount of slag， slag overflows from the furnace door in the middle and late smelting process； At the same time， the cleanliness of the molten steel significantly increases after adding DRI to the EAF， and the mass fraction of nitrogen， phosphorus， sulfur and residual elements at the end of EAF smelting is reduced. And as the proportion of DRI added increases， the rate of decrease in nitrogen mass fraction at the endpoint of the electric furnace decreases. In addition， with the increase of DRI addition ratio， the FeO mass fraction of final slag showed a decreasing trend. When DRI is added at a proprotion of 20%， the effect is better， the smelting cycle is lower， the increase in electricity consumption is not high compared to the total scrap steel furnace， and the nitrogen and residual element content is lower， meeting the requirements of most steel grades.关键词：Consteel EAF;DRI;Technical and Economic Indicators;Cleanliness;Final Slag of EAF2|1|0更新时间：2025-05-09
- 摘要：The influence of different bottom blowing processes on the flow field and dead zone distribution of molten steel was simulated using Fluent software， taking the 130 ton ladle as the research object.The results showed that when the center distance decreased from 0.65R to 0.50R， the average flow velocity of the molten steel decreased from 0.24 m/s to 0.05 m/s， and the proportion of low flow velocity areas significantly increased. The steel flow at the two wall ends was slow， and the average flow velocity at the interface of slag and molten steel decreased from 0.18 m/s to 0.009 m/s. The proportion of dead zones increased from 7% to 25%， and the overall stirring effect decreased； When the center angle of the permeable brick increased from 85° to 180°， the average flow velocity of the molten steel decreases to 0.09 m/s， the average flow velocity at the interface of slag and molten steel was 0.05 m/s， and the dead zone volume ratio increased to 28%； With the amount of argon blowing increased， the flow rate of the molten steel significantly accelerated， the dead zone volume further decreased， and the mixing time of the molten steel gradually shortened. At 200 L/min， the average flow rate increased to 0.43 m/s， and the average flow rate at the horizontal interface of slag and molten steel was 0.32 m/s. There was no slag entrapment phenomenon， and the mixing time of the molten steel was 300 seconds. In summary， it is determined that the optimal solution is an argon flow rate of 200 L/min for breathable brick 1 and 210 L/min for breathable brick 2.under the following conditions： the diameter of the two breathable bricks is
- 摘要：Aiming at the problem of inclusions evolution control and removal of fine wire cord steel of
- 摘要：Based on the nickel-base alloy production platform of Fushun Special Steel Co.， LTD.， this paper studies the feasibility of "30 t non-vacuum induction furnace-external furnace refining-electroslag remelting" process instead of the traditional high cost process to smelt nickel-base alloys with high molybdenum content， and analyzes the production efficiency and cost advantages combined with the production practice. The results show that by degassassing smelting process scheme with 30 t non-vacuum induction furnace was used to melt molten steel ， VOD blowing oxygen and decarbonized after vacuum to below 67 Pa， and the smelting of nickel-base alloy N06625 and N10276 products with high molybdenum content was successfully realized.The steel ingot produced after electroslag is 204 mm forging products， the chemical composition and non-metallic inclusions meet the industry standard requirements， and further improve the production guarantee and cost control ability of high molybdenum nickel-base alloy.关键词：Nickel-base Alloy;Non-VIM;VOD;ESR;Low-cost Smelting3|0|0更新时间：2025-05-09
- 摘要：In this paper， a steel plant with high pulling speed thin thickness slab continuous casting process as the object is studied， the specific process parameters of the pulling speed of 5.5 m/min， pouring temperature of 1 544 ℃， crystallizer water pressure of 15.6 Pa， the cooling water temperature of 39.1 ℃， and the inverted taper of the crystallizer 7.5 mm and so on.In the process of on-site continuous casting， it was found that the risk of slag rolling increased and the casting bond alarm occurred frequently， the conventional slags and non-Newtonian fluid mold flux with only shear-thinning properties could not effectively in solving these problems .With the mold flux of medium carbon steel on-site as the original mold flux ， combined with additives such as MgO and SiC ， a new type of protective slag with strong shear-thinning properties and high surface tension is prepared. The shear thinning properties， surface properties and microstructure of mold flux were detected and studied by rotating cylinder method and other methods. The results show that with the increase of SiC content， the shear thinning property， contact angle， surface tension and interface tension of the mold flux all show the trend of increasing first and then decreasing， the content of C-O bond and C-Si bond increases， and the degree of molecular polymerization increases . When the SiC content is 0.98%， the shear thinning property is the strongest， and the contact angle， surface tension and interfacial tension are the largest. This enables the mold flux to meet the viscosity requirements at different shear rates， thus effectively suppressing the crystallizer slag rolling behavior and reducing the risk of bond leakage.关键词：Mold Flux;Shear Thinning;Sessile Drop Method;Surface Tension;Microstructure7|2|0更新时间：2025-05-09
- 摘要：In order to improve bias flow， jump bar and water plugging phenomenon during ultra-low carbon steel continuous casting process in a factory， through the tunish breathable on the nozzle， plug rod and immersion nozzle such as continuous casting function resistant material improvement， switch the air top nozzle to switch to special diffusion breathable material， blowing into the argon bubbles along the nozzle form uniform air curtain. The surface stomatal rate is 5.2% higher than that before the improvement， which prevents the accumulation of inclusions in the inner wall of the nozzle and alleviates the clogging of the nozzle. One argon hole located in center is changed to six holes of stopper rod， which can realize 360° even argon blowing around its head and decrease inclusion collection on the head. The SEN adopts merterials of carbon free， low aluminum， high silicon content. These refractory can react with the inclusion on the wall of SEN， which prevents its clogging. After the application of improved resistant materials in ultra-low carbon steel， the number of jumping rods per casting is reduced by 0.83 times and 31.8%， the frequency of online replacement of SEN caused by nozzle plugging is reduced by 0.38 pieces and 41.3%， and the control accuracy of crystallization level is stabilized， the qualified rate of cold rolled coil inclusion is improved by 0.238%， and the number of single tunish casting heats is increased by 0.53 heats and increasing by 8%， thus optimize the flow field of mould. It is proved to put forward to optimize 1 000 mm-2 200 mm caster’s mould flow field.关键词：Wide Slab Continual Casting;Mould;Submerged Nozzle;Stopper Rod;Mould level Control;Inclusion2|0|0更新时间：2025-05-09
- 摘要：In the process of producing 1Cr13 stainless steel， serious longitudinal cracks breakout and transverse dents appear in the casting billet. FactSage8.2 thermodynamic software was used to calculate ternary and quadruple phase diagrams to design the ingredient of the protective slag. At the same time， the solidification characteristics of 1Cr13 stainless steel were calculated. As this steel is a peritectic steel， it will produce a sharp volume contraction during the solidification process， resulting in longitudinal cracks in the weak part of the blank shell. In order to avoid the dents and longitudinal crack caused by the uneven raw shell， the basicity of the protective slag should be improved， the crystallization property of the protective slag should be improved， and the heat transfer control ability of the protective slag should be improved too.The basicity of the new protective slag is 1.5， the slag is 6%MgO， 2%Li2O， 16%Al2O3， 8%Na2O， 3%B2O3， 10%CaF2. The melting point of the original slag of 1Cr13 stainless steel is 1 155 ℃， the constant temperature viscosity is 0.442 Pa·s， and the transition temperature is 1 140 ℃. The melting point of the new protective slag is 1 120 ℃， the viscosity is 0.304 Pa·s， the transition temperature is 1 171 ℃， and the crystallization temperature is 1 270 ℃. After actual production， the surface quality of the casting billet is obviously improved.关键词：Longitudinal Crack;Transverse Depression;1Cr13 Stainless Steel;Protective Slag;Viscosity4|0|0更新时间：2025-05-09
Smelting and Solidification
- 摘要：The microstructure of GH4163 alloy at different solid solution temperatures， the changing pattern of tensile properties at room and high temperature， are investigated by adjusting the solution temperature. The microstructure of the original state sample is deformed tissue， with discontinuous grain boundaries and biased polymer band distribution. The grain boundaries are clear ， the grain has incomplete recrystallization， and the band polarization of carbide strip is significantly improved when the solid solution temperature is 1 000 ℃. The grains grow slowly when the solution temperature is 1 050 ℃. The carbides are significantly reduced， and the grains begin to grow rapidly when the solution temperature is 1 080 ℃. The relationship between grain size and yield strength of GH4163 alloy at room temperature satisfies Hall-Petch， which is
- 摘要：In order to study the differences in microstructure and high temperature properties of different positions of turbine disc forging in GH4706 alloy， comparative analysis of mechanical properties at high temperature were carried out. Detailed experiments included high-temperature tensile property （conducted at the temperature of 400 ℃， 500 ℃， 600 ℃ and 650 ℃）， high-temperature low-cycle fatigue （conducted at the temperature of 400 ℃， 500 ℃ and 600 ℃） and high-temperature stress rupture life （conducted at the condition of 650 ℃/690 MPa and 600 ℃/700 MPa） based on typical service performance requirements. The test results showed that the grain sizes of the hub， spoke and rim varied significantly， with the hub grain size level 4 （average grain size 84 μm）， spoke grain size level 3 （average grain size 120 μm） and rim grain size level 2 （average grain size 183 μm）.The γ′-γ″ composite of the samples in different positions were dispersed in spherical shape. The η phase of hub and plate is in needle shape， with larger size， and distributed parallel to grain boundaries. The η phase of rim precipitates in the shape of short rods with smaller size and dispersed arrangement at grain boundaries. There was no significant difference in high-temperature tensile strength at different locations. However， the samples from hub had excellent low-cycle fatigue performance （4 363 cycle number）， while the tensile plasticity and stress rupture life of rim was the longest （1 259 h）. The study indicated that the variation of microstructure from different positions of turbine disc forging in GH4706 alloy had significant effects on mechanical properties.关键词：GH4706 Alloy;Turbine Disc;Grain Size;High-temperature Mechanical Properties3|1|0更新时间：2025-05-09
- 摘要：The mechanical properties of 40CrNi2Si2MoV martensitic steel are affected by the large size carbides，the strength and toughness of martensitic steel can be effectively improved by optimizing the composition design and reasonable heat treatment process. The effects of M6C carbide on mechanical properties and microstructure of ultrahigh strength steel were studied at different quenching temperatures （860 ℃-1 150 ℃）， and the evolution of M6C particle size， quantity and composition was studied by means of SEM and TEM. The results show that large M6C particles reduce the toughness of ultrahigh strength steel， and the M6C particles in the 880 ℃ quenching sample are large （~400 nm）， which is easy to cause stress concentration around the large M6C carbide ， weaken the binding force between the matrix and M6C carbide， and easy to crack around M6C carbide， resulting in material fracture.With the increase of quenching temperature， the size and quantity of M6C particles in the test steel decrease， and the concentration of Si in M6C particles is increased， and the atoms in M（Fe， Mo， Ni， Co）6C are replaced by Si， which improves the stability of M6C carbide. The size of M6C particle in the 1 050 ℃ quenching temperature test steel is 25 nm， and the growth of the original austenite grain （8.5 μm） is inhibited. The strength of the test steel is 2 227 MPa and the elongation is 7.0%， achieving a good strength and toughness matching.关键词：40CrNi2Si2MoV Martensitic Steel;M6C;Quenching Temperature;Mechanical Properties;Grain Size3|2|0更新时间：2025-05-09
- 摘要：The continuous cooling phase transformation behavior has important guiding significance for formulating the heat treatment process of steel. In this paper， the thermal expansion method was used to measure the continuous cooling phase transformation curves of 40Cr13 mold steel at different cooling rates （0.5 ℃/s-20 ℃/s）. The microstructure and Vickers hardness of the material after phase transformation at different cooling rates were analyzed using scanning electron microscopy and microhardness tester， The phase transition behavior of 40Cr13 mold steel was observed in situ under high-temperature confocal laser microscopy （HTCLSM）. The results showed that the critical transition point Ac1 was 836 ℃ and Ac3 was 903 ℃； Martensite transformation occured in the cooling rate range of 0.5 ℃/s-20 ℃/s. As the cooling rate increased， the distribution of carbides in the steel became more uniform. When the cooling rate increased from 0.5 °C/s to 3 °C/s， the average hardness value of the sample increased from 417 HV to 550 HV. As the cooling rate continued to increase， the average hardness value of the sample finally stabilized at 560 HV-580 HV.The cooling rate （v） and Vickers hardness （Hv） were fitted with the formula
Forming and Phase Transition
- 摘要：The high frequency tensile fatigue test of heat-resistant fasteners of A286 alloy with different thread processing sequences was carried out by means of axial fatigue testing machine， metallographic microscope， microhardness tester and scanning electron microscope， and the metallographic of fatigue fracture and thread was analysed . The results show that machining thread after 720 ℃-12 h aging is beneficial to improve the stability of fatigue performance of fasteners， and has a slight effect on the median fatigue strength， but has no effect on the fatigue fracture mode. A large number of twins are formed on the surface of machined threads before aging， and the reinforced phase precipitates out at the twin boundary with large size particles during aging. Because the hardness of fasteners threaded before aging fluctuates greatly， it may also be the cause of the fluctuation of fatigue performance.关键词：Heat-resistant fastener;High temperature alloy;Thread;Fatigue Performance2|0|0更新时间：2025-05-09
- 摘要：The paper addresses the issue of fluctuating low-temperature drop-weight tear test （DWTT） performance in 6-8 mm thin-wall pipeline steel， the influencing factors of the control process of low-temperature DWTT of X65 thin-wall pipeline steel have been explored. With microstructure analysis and numerical deconstruction study of different low-temperature DWTT results， ， it reveal that the size of polygonal ferrite grains and the distribution of M/A constituents in the central part of the steel plate significantly affect low-temperature DWTT performance. When the average area of grains with an area ≥200 μm2 is greater than 260 μm2， and the proportion of M/A constituents is greater than 6%， DWTT performance shall deteriorate significantly. By optimizing the composition and continuous casting and rolling processes， control of grain size and M/A constituents can effectively improve the low-temperature DWTT performance of thin-specification pipeline steel. The related product has achieved stable production of more than 80，000 tons， meeting the requirement of -30 ℃ low-temperature DWTT， it is of great significance for the development and production of thin-wall pipeline steel products.关键词：Thin-wall Pipe Line Steel;DWTT;Grain Size;M/A Microstructure;X65M2|0|0更新时间：2025-05-09
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