最新刊期
卷 44 ， 期 1 ， 2023
- 摘要：The technological measures to control oxygen content of gear steel in 100 t EAF⁃LF⁃VD⁃CC⁃CR whole process are put forward. The rotary bending fatigue properties， fracture and inclusion size of gear steel 20MnCr5 with oxygen content 0．000 53％ ~ 0．001 45％ are investigated. The results show that the higher the oxygen content， the larger the size of maximum inclusion and the lower fatigue strength of steel， while [O] ≤0．001 0％ ，with [O] decreasing， the fatigue strength of steel decreasing within a narrow range； the critical inclusion size of the test steel without fatigue crack under the surface is 21 μm and the shallow zone 30 ~ 430 μm away from the surface is relatively safe zone， where inclusions are difficult to cause fatigue cracking．关键词：Oxygen Content;20MnCr5 Gear Steel;Fatigue Strength;Critical Size of Inclusion4|1|0更新时间：2026-01-21
- 摘要：Serious white spots defect occurs on the surface of (4.4～4.6) mm×2050 mm wide-thick cold rolled strip of 316L stainless steel (/%:0.02C,17. 12Cr,10. 15Ni,2.06Mo) for tank container in production process. The causes of the white spots are researched by means of feature analysis, steels grades comparison and on-site defect tracking, the results show that there is much emulsion on the surface of cold rolled strip, on which the formed oxide scale is unevenly distributed in case of incompletely degreasing and annealing at 980 ℃,the color of the oxide scale on the surface with much emulsion is white, these white oxide scales are changed into white spots after pickling. Besides, the influencing factors of the residu al emulsion on the surface of rolled strip and the removal effect of residual emulsion are systematically studied. By applying oil scraping system for nonwoven-fabric roller, adding air knife purging system, controlling emulsion concentration 1.5%~ 3% and temperature(55±3)℃,repairing two sets of magnetic filtration system in rolling process, through controlling de- greasing electrical conductivity7.5 μs/cm and loop filling speed 50 m/min,adjusting9～12 area Furnace temperature to 1030 ℃,the unqualified rate of white spots is reduced from 10% to 0.5% or less.关键词：316L Wide ?thick Cold Rolled Strip for Tank Container;White Spots;Emulsion;Degreasing;Annealing4|0|0更新时间：2026-01-21
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Process Practice of Arc Caster Producing φ1200 mm S355NL/Q355NE Steel Continuous Casting Round Bloom
摘要：Φ1200 mmS355NL/Q355NE steel (Ceq0.38-0.41) continuous casting round bloom is manufactured by 100 t KR-BOF-LF-RH-R18M continuous casting process. Full protective casting, precise cooling process, three-stage electro- magnetic stirring, slow cooling process and other technical measures are adopted. The superheat is controlled at 1545 ℃, the drawing speed is 0.14-0.20 m/min, the electromagnetic stirring is 300 A/2 Hz, the secondary cooling water ratio is 0.20 L/kg, the slow cooling time into the pit is ≥72 h, and the pit exit temperature is ≤300 ℃. The results show that [0]≤0.0018%,[H]≤0.00008%; the central porosity of cast bloom≤1.5 rating, the central crack≤1.5 rating, the shrinkage cavity ≤0.5 rating, and the carbon content range of the whole section≤0.07%. Chemical composition, macrostruce, surface quality all meets the standard requirements. After the round bloom is forged into wind turbine flanges with wall thickness of 450-550 mm by customer, the test results of inclusions, mechanical properties, internal flaw detection and other quality indexes are satisfactory, which fully meet the technical specifications and user requirements.关键词：Φ1 200 mm;Large Section Round Bloom;Arc Continuous Caster2|0|0更新时间：2026-01-21 - 摘要：In the light of problems of smelting ultra-low phosphorus steel (%/： <0. 03C、<0. 01 OP、<0. 015S、< 0.06Mn、vO. 02Cr、<0.02Ni), the lower liquid temperature at 90 t BOF tapping and serious overoxidation of liquid, led to heating refining by LF, are tested and studied by process optimization. The results show that during BOF (0. 018% - 0. 025% P) tapping process by adding lime and refining slag to produce slag with binary alkalinity 7 and P2O5 <0.5%, the dephosphorization rate of liquid in ladle reaches up to 75%, the phosphorus content of finished products is less than 0.010%, the smelting time is shortened by 3 ~ 4 min. At the same time, the dephosphorization rate of ladle decreases with the increase of liquid steel temperature at the end of converter blowing, the BOF optimum end-point temperature is between 1 630 °C and 1 655 °C. By adopting ladle dephosphorization technology, the smelting process of ultra-low phosphorus steel is shortened to converter blowing—►RH treatment—►continuous casting, and the LF refining process is omitted.关键词：Ultra?Low Phosphorus Steel;Ladle;Slag;Dephosphorization in BOF Tapping Process2|0|0更新时间：2026-01-21
- 摘要：The continuous cast round bloom of DZ2 high-speed axle steel is remelted by electroslag with argon protective atmosphere and rolled into axle billets. The composition, hydrogen and oxygen content and the number, size and morphology of inclusions in the axle billets are analyzed and detected, and the corresponding results are compared with that in the axle billet rolled directly by continuous cast slab. The results show that after electroslag remelting, the C content of the axle billet is more uniform at longitudinal and transverse direction(0.25%-0.27%C),but average Al and Si content respectively decreased from 0.25% and 0.018% in ingot head to0.23% and0.015% in ingot tail, hydrogen and oxygen content respectively increased from0.85×10-6and9×10-6in cast bloom to1.52×10-6and 10×10-6in ESR ingot. The inclusions in the ESR axle billets are mainly small-size spherical calcium aluminate, the size of inclusions above 10 μm is few and the number density between 5- 10 μm is 0.068/mm²and1-5 μmis0.04/mm², which indicates that electroslag remelting in protective atmosphere can not only remove large inclusions, but also significantly reduce the number of small-size inclusions in steel.关键词：Electroslag Remelting;DZ2 High-Speed Axle Steel;Composition;Inclusions;Continuous Casting2|0|0更新时间：2026-01-21
- 摘要：During KR desulfurization process, the variation of[S] in hot metal and(S)in desulfurization slag is studied accordingly, by sampling in the 200t hot metal ladle at Tangsteel new plant. It shows that, during the 10 minutes of KR stirring process, the sulfur in hot metal decrease from initial 0.038% to 0.002%, and the sulfur in desulfurization slag is increasing from initial0.028% to3.28%. while the desulfurization rate keeps decreasing from 68% to33%. So the limiting link of KR desulfurizing happens at the last 7 to 10 minutes, which not clear in many studies at present. In order to improve the desulfurizing efficiency for the last few minutes, step-changing stirring speed is adopted and applied for the practical industry experiments, the stirring speed decrease from 90- 110r/min to45-90 r/min, and then the amount of desulfurizer can be reduced from 8- 10 kg/tto4.0-6.5 kg/t without increasing stirring time. So, this kind of KR desulfurization model of step-changing stirring speed and immerge depth of impeller has a potential application value for practical industry production.关键词：Hot Metal KR Mechanical Stirring;Desulfurization Model;Step-Changing Stirring Speed;Highly-Efficient Desulfurizing2|0|0更新时间：2026-01-21
- 摘要：By investigating the transformer parameters of 60 t LF in a steelmaking workshop and combining with the selected test GCr15 steel LF process characteristics, the software is developed, and its electrical power characteristic curve is calculated, two power supply schemes that are suitable for the LF with the fastest heating speed and relatively power saving and the most economical power consumption are proposed. The first power supply scheme, at slagging and heating phase in the first stage the 4 stages (220 V) voltage and 18-20 kA phase current are adopted, and at heating phase in the second stage the 3 stages (240 V) voltage and 20 kA phase current are adopted, which is suitable for LF secondary power supply with fast production rhythm and relatively power saving. In the second power supply scheme,the5-grade(203 V)voltage and 17- 19 kA current power supply system are adopted in the first stage of slag melting and heating up; in the second stage of heating up, the 4-grade(220 V)voltage with 18 kA current is adopted; in the third stage, the heat preservation period is the same as the first power supply scheme, it can be applied to most of the production rhythm not too tight heats. Compared with the index before the test of the power consumption per ton of CCr15 steel and energy consumption per unit weight of molten steel temperature rise, the main energy consumption is reduced by8.51% and7.29% respectively, and the heating rate is increased by 8. 14%.关键词：60t LF;Power Supply System;Electrical Characteristic Curve;Power Consumption;Rate of Heating3|0|0更新时间：2026-01-21
- 摘要：The practical application of particle dephosphorization with compound injection agent on 130 t electric arc furnace is carried out. The composition of dephosphorization slag system in the oxidation period of electric furnace is designed, basicity of slag is controlled between 2.2-2. 8, and the content of iron oxide is controlled between 15% -20%. The composite powder of carbon powder (15% -20%), CaO powder (40% -60%), MgO powder (25% -30%) and CaC powder (5% - 10%) prepared in a certain proportion is injected with nitrogen as the carrier. After adopting the smelting process of injection compound injection agent on EAF steelmaking of 40Cr, 0.45C steel, 20CrMnTi and 60Si2Mn etc alloy steels, the reaction area of flux is accelerated, the slag forming speed is improved, and various production indexes are improved. Among them, the power consumption per ton steel is reduced by 90 kWh/t, the steel material consumption per ton steel is reduced by 9. 3 kg/t, the flux consumption per ton steel is reduced by 4. 8 kg/t, the productivity is increased by 5% -6%, and the comprehensive production cost per ton of steel is reduced by 25 yuan/t.关键词：Electric Arc Furnace;Dephosphorization;Injection;Composite Powder;Cost2|0|0更新时间：2026-01-21
- 摘要：The effect of oxygen content T [O] on distribution, size and morphology of sulfide inclusions in 160 mm × 160 mm cast billet of Y1215 free cutting steel and the deformation status of sulfide inclusions in hot rolling to φ8.0 mm coil are studied. The results show that with the increase of oxygen content, the size and distribution of sulfide inclusions in cast billets have no obvious difference; but the complex inclusions increase including MnS as core covered or adhered by MnO-SiO2and MnO-SiO2-Al2O3as core adhered by MnS. In the φ8.0 mm rolled coil rod, rod as T [O]0.0074%, the sulfide deformation in the wire rod is obvious, part of the sulfide is broken because of serious tensile deformation, the length-width ratio of sulfide is 23.2, as T[O] 0.0145%, the sulfide deformation along the rolling direction is small mainly in the spindle shape with length-width ratio3.4.For Y1215 free cutting steel, in order to obtain spherical or spindle sulfide inclusions, the T [0] in smelting steel can be controlled between 0 0095% and 0 0145%关键词：Free Cutting Steel Y1215;Oxygen Content;Sulphide2|0|0更新时间：2026-01-21
- 摘要：The surface of rolled products of drill steel 55SiMnMo produced by 100 t BOF-LF-VD-4450 mm CC bloom- φ200 mm rolling bar production process is prone to surface crack.The effect of superheat,secondary cooling,casting speed and composition(Ti.B)on defects are analyzed and compared. Through process improvement which is obtained that by controlling superheat 20-30 ℃,B content controlled≤0.0008%,Ti content 0.015%-0.025%,drawing speed 0.41 m/min,and secondary cooling ratio 0.17 L/kg,the crack defect rate decreases from 12.2% to1.6%.关键词：55SiMnMo钎具钢;表面裂纹;工艺改进2|0|0更新时间：2026-01-21
- 摘要：Niobium-containing phase precipitating in liquid steel during solidification in (220 mm×260 mm) continuous casting bloom of Nb microalloying F40MnVS steel (adding 0.029% Nb) is studied in the paper. The results show that there are many micro-sized large particles of NbC(/%:80-94Nb,1.2-7. 1V,1.6- 17. 1Ti) in bloom. The large NbC is distributed between the dendrites its morphologies can be block shape, long strip shape, or eutectic shape with steel matrix, part attached to sulfide. NbC at the edge position in bloom is mostly less than 5 μm,the morphology is mostly dotted while that at middle and center position is large and mostly long with size even up to tens of microns. The large NbC still exists in hot- rolled bar. According to calculated results by Thermo-Calc software, the NbC precipitates in liquid steel during solidification process when solid fraction reaches 0.961, and the existence of element Ti may be the mutual dissolution result of NbC and TiN. By increased the heating temperature of bloom before rolling to1200 ℃, the size of large NbC could be obviously decreased.关键词：Micron-Sized Large NbC Particles;Nb-Microalloyed;F40MnVS Steel;Continuous Casting Bloom;Thermo-Calc6|0|0更新时间：2026-01-21
- 摘要：The sulfur content in high-grade non-oriented silicon steel W310 is generally required to be less than 0.002 5%. Based on the manufacturing process of " KR― BOF—>RH—^continuous casting , the mechanism of KR deep desulphurization ,converter smelting and RH powder spraying desulphurization are analyzed and studied in this paper, combined with the working conditions and raw material conditions of the 300 t steel-making system, the thermodynamic and kinetic conditions improvement measures such as optimization of hot metal composition and temperature, composition adjustment of KR and RH desulfurizer, converter heal balance control, strong bottom blowing smelting and process sulfur load control are put forward. Application results show that after optimization, the ratio of sulfur content less than 15 x 10-6in once KR treatment has increased from 69% to 100%, and the sulfur content after treatment has decreased from 10.48 x 10-6to 7.07 x 10-6. The average sulfur content at the end point of converter is 20. 10 x 10-6and sulfur pick-up by 13.03 x 10-6during process, which are 44. 8% and 49. 8% lower than before optimization, respectively. The sulfur content of RH liquid steel decreases from 19.50 x 10-6to 8. 65 x 10-6the dosage of desulfurizer decreases by 55.9%, and the proportion of sulfur less than 25.00 x 10-6increases from 90.5% to 100%, good results have been achieved.关键词：Silicon Steel W310;Smelting;Desulphurization;Sulfur Pick-up;Thermodynamics7|2|0更新时间：2026-01-21
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Development and Research on Fishing Scaling Resistance of Low Carbon Cold Rolled Enamel Steel DC01EK
摘要：Low-carbon cold-rolled fishing scaling resistance enamel steel DCO1EK(/%:C≤0.06,Si≤0.03,Mn:0.15-0.25,P≤0.015,S:0.010-0.020,Alt:0.020-0.040,B:0.0010-0.0020)1.8mm sheet is developed by angang 1780 mm hot continuous rolling 1550 mm cold rolling production line. With direct hot charging hot rolling process, final rolling 890 ℃,and coiling at 720℃, the precipitation of the second phase particles of BN,MNS and Fe3C is controlled to improve fishing scaling resistance of steel. The annealing temperature 810 ℃ is adopted to improve the stamping perform- ance of low-carbon cold-rolled enamel steel DCO1EK. The results show that of low-carbon cold-rolled enamel steel DCO1EK the yield strength is 208-239 MPa,the tensile strength is 333-348 MPa, and the elongation >36%. Its metallographic structure is ferrite and pearlite,which can meet the requirements of stamping forming. The effects of boron and second phase particles on the phosphorus explosion resistance of low carbon cold rolled enamel steel are studied by hydrogen permeation test.关键词：Enamel Steel DC01EK;Second-Phase Particle;Fishing Scaling Resistance2|0|0更新时间：2026-01-21 - 摘要：The high thermal conductivity,low coeffcient of thermal expansion and good corrosion resistance of 445J2 ferrit- ic stainless steel make it be a good candidate for some parts in the bromine cooler. The pitting corrosion behaviors of 445J2 ultrapure ferritic stainless steel(/%:0.01C,22.5Cr,1.9Mo,0.27Nb,0.20Ti,0.09Al,0.36Cu,0.015P, 0.001S,0.015N)and 316L austenitic stainless steel(/%:0.002C,16.8Cr,10. 19Ni,2.02Mo,0.025P,0.0008S)in 0.1- 1M lithium bromide solutions at 20-60 ℃ are studied by electrochemical test method. The electrochemical results are characterized by scanning electron microscopy(SEM)and energy dispersive analyzer (EDS).The results show that with the increase of LiBr temperature and concentration,the corrosion current density of the two steels increases, the pitting corrosion potential decreases, and the pitting corrosion resistance deteriorates; oxide and sulfide inclusions can cause pitting corrosion of the two steels; High content of Cr and alloying elements such as Mo,Ti,Nb,Al make 445J2 steel have excellent pitting resistance.关键词：445J2超纯铁素体不锈钢;316L超低碳奥氏体不锈钢;点蚀;溴化锂2|0|0更新时间：2026-01-21
- 摘要：14.0Cr- 1. 1Ni-9.2Mn-0.30Cu stainless steel was developed on the basis of13.36Cr- 1. 12Ni- 11.2Mn low-nickel austenitic stainless steel, and the metallographic structure, microstructure, mechanical properties and forming properties of austenitic stainless steel with different chemical compositions after solution treatment and cold-rolled annealing are studied, as well as the control laws of austenite stability and cold rolling deformation induced martensitic transformation were analyzed. The results show that the mechanical properties of 14.0Cr- 1. 1Ni-9.2Mn-0.30Cu and that of 13.36Cr- 1. 12Ni- 11.2Mn stainless steel are equivalent, the austenitic structure is fully recrystallized after solution treatment and cold-rolled annealing, the average grain size of cold rolling is 12.6 μm and 14.0 μm respectively, and the microstructure is copper texture{112}<111>the IE (bulge test impression endurance value)and LDR (Limited Drawing Ratio) of 14.0Cr- 1. 1Ni-9.2Mn-0.30Cu stainless steel are 16.15 and 0.46 respectively, which are better than those of 13.36Cr- 11.2Mn stain- less steel, and the Md30/50 temperature of 14.0Cr- 1. 1Ni-9.2Mn-0.30Cu and 13.36Cr- 1. 12Ni- 11.2Mn stainless steel are 87.02 ℃ and 83.55 ℃ respectively, as Md30/50 high, the austenite stability poor, the deformation introducing martensite volume and cold-rolled deformation resistance increasing, the hardness of annealed steel high. But the hardness after annealing can be improved by reducing the speed of cold-rolled annealing process from 10 m/min to9 m/min.关键词：Austenitic Stainless Steel 14.0Cr- 1. 1Ni-9.2Mn-0.30Cu;Low-nickel;Microstructure Property;Forming Performance;Austenite Stability;Deformation Induced Martensitic Transformation;Annealing Process2|1|0更新时间：2026-01-21
- 摘要：Effect of solid-solution treatment on microstructure and impact properties of solid-solution + aged UNS N07718 alloy[/%:0.03C,52.5Ni,18.0Cr,3.0Mo,5.0(Nb+Ta),0.90Ti,0.50Al] are investigated.After960℃ solid-solution + aging treatment, the δ phase diffusely distributes on the grain boundaries and in the grains, and the grains are relatively uniform and fine with impact energy 17J.After1000℃+960℃ solid-solution+aging treatment, the size of δ phase distributed on the grain boundaries becomes larger ,and the grain size is slightly increased.After1010℃+960℃ solid-solution aging treatment, the phase& are dissolved, and only a little of δphase is located at the grain boundaries, while the grain size is increased evidently.After1020℃+960℃ solid-solution+aging treatment, the granular δ phases are disappeared.After1010℃+960℃solid-solution+agingtreatment,the impact energy of sample is 43J and a 150% increase in the impact energy, compared with 960℃ aged in addition, the fracture morphologies of the sample surface exhibit a number of dimples obviously.关键词：UNS N07718 Alloy;Solid-Solution Temperature;Microstructure;Impact Property2|0|0更新时间：2026-01-21
- 摘要：The dynamic CCT curve measurement and rolling process simulation test of AG650LW steel are carried out by gleeble-3800.It is obtained that the structure to satisfy 650 MPa rim steel is ferrite + bainite + a small amount of pearlite, with end rolling temperature at 840～880 ℃and coiling temperature at 480 ℃, laminar flow cooling rate after rolling≥ 10 ℃/s, and hardness value≥220HV.The comprehensive crack ratio of the test coil is 4.3%, which meets the requirement of the user.关键词：650 MPa;AG650LW钢;车轮轮辋;热模拟;冷却速率;卷取温度;开裂率2|0|0更新时间：2026-01-21
- 摘要：The ultralow temperature impact tests for S31608 stainless steel(/%:0.065C,16.50Cr,11.80Ni,2.2Mo) Φ168 mm×13 mm extruded seamless pipe (solid-solution-treated at 1060- 1020 ℃ with grain size 50.2- 17.6 μm)at 20 ℃ and-40--269 ℃ are carried out, and the impact fracture is analyzed by scanning electron microscope. The results show that the S31608 steel has high impact energy i.e.290-360Jat-269-20 ℃,and only the grain size of steel has obvious effect on impact energy at -80℃ and- 120 ℃,the impact energy of steel with grain size 25.3-50.2 μm (solid-solution-treated at 1060- 1040℃)at-80℃ and- 120℃ is330-360J,but that of steel with grain size 17.6 μm(solid-solution-treated at1020℃)at-80℃ and- 120℃ is 320-360J.关键词：S31608;Utra Low Temperature;Grain Size;Impact Energy;Fracture Morphology2|0|0更新时间：2026-01-21
- 摘要：Effects of wire drawing reduction rate of cross-sectional area on spheroidizing annealing structure and mechanical property of φ9.67- 11.69mm 10B30 steel wire rod(/%:0.28-0.34C,0.0005-0.0030B) have been studied. The results show that with increasing of drawing reduction of cross-sectional area, the rate of spheroidizing annealing structure increases, the tensile strength decreases and the reduction of area increases, this is because the wire drawing promotes spontaneous spheroidizing and ostwald ripening of carbide during spheroidizing annealing. Spheroidizing annealing structure and corresponding tensile strength and reduction rate of cross-sectional area become stable when drawing reduction rate of cross- sectional area is over 25%. In actual production, drawing reduction of cross-sectional area before annealing shouldn't be less than 25%.关键词：10B30 Steel;Wire Drawing Reduction Rate of Cross-Sectional Area;Spheroidizing Annealing;Spheroidizing Structure;Mechanical Property2|0|0更新时间：2026-01-21
- 摘要：The effect of microstructure on impact properties of AH80DBD low carbon bainite steel is analyzed by macro-fractography, scanning fractography, metallography and transmission electron microscope. The experimental results show that by cooling rate 22℃/s after rolling, the microstructure with better impact toughness (-20℃ Axy 204-235J) is granular bainite+Lath Bainite+fine M-A. With distance between lath 200-400nm, by cooling rate 12 ℃/s after rolling, the distance between lath is~800nm, and the-20 ℃ Akvof steel is only 41-57J. Therefore, the cooling rate of AH8ODB is greater than 20 ℃/s during production.关键词：AH80DBD Low Carbon Bainitic Steel;Cooling Rate After Rolling;Impact Energy;Microstructures Performance2|0|0更新时间：2026-01-21
- 摘要：To ensure the prerequisite of [Mn]+[Cr] controlled by0.5%-0.6%, the content of Mn is reduced from 0.50% to0.24%, and the content of Cr is increased from 0.021% to 0.32% in order to keep hardenability and obtain higher strength and toughness of C82D2Cr steel. The results show that, compared with C82D2 steel φ5.5 mm wire rod, the tensile strength of C82D2Cr steel φ5.5 mm wire rod is increased by 50 MPa, the reduction of area is increased by 4%, the lamellar spacing of sorbite is decreased by 9.8%, and the size of pearlite colony is decreased by 14.5%.C82D2Cr steel not only has obvious dislocation line at the interface between ferrite and cementite, but also increases dislocation line density, and increases dislocation cells in ferrite, which can significantly increase; deformation strengthening ability. The custom- er has verified that C82D2Cr steel rod can meet the production requirements of 2×0.30UT steel cord.关键词：Chromium Alloying;Ultra High Strength Steel Cord;Strengthening and toughening;Pearlite Colony;Sorbite Lamellar Spacing135|17|0更新时间：2026-01-21
- 摘要：The microstructure evolution, and mechanical properties of new-type slot edge steel 30MnSiCrMo quenched at 900-920 ℃ for 30 min and tempered at 350-550 ℃ for2 h are studied by using optical microscope, scanning electron micro- scope, tensile, impact and Brinell hardness tester. The results show that martensite decomposition, transformation-aggregation-growth of carbide, and recovery-recrystallization of α phase happen during 350-550 ℃ different tempering process, the room temperature microstructure transits from tempered martensite to tempered troostite and tempered sorbite. With the in- crease of tempering temperature, the solid solution strengthening and carbide precipitation strengthening gradually weaken, the strength and hardness of testing steel continuously decrease, while the plasticity and toughness gradually increase. The excellent strengthen and toughen matching of the testing steel is obtained i.e. with austenitizing at 900 and 920 ℃ for 30 min, water quenching and tempering at 450-520 ℃ for 2h,the tensile strength of steel is 1159- 1008 MPa, the yield strength is 1107-944 MPa, the elongation after fracture is 11.8%- 15.0%,the room temperature hardness is 336- 293HBW,and the V-shaped impact absorption energy is 45.5-67.5 J, which could meet the requirements of strength and toughness of the central trough ledge.关键词：Slot Edge Steel 30MnSiCrMo;Quenching and Tempering;Microstructure;Strength and Toughness2|0|0更新时间：2026-01-21
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