新型阀门钢5Cr8Si2组织与性能

通过对新型内燃机阀门用钢5Cr8Si2组织、机械性能和抗氧化性的试验研究,并与常用阀门钢4Cr9Si2和4Cr10Si2Mo对比表明,5Cr8Si2钢具有相对优良的加工性能和使用性能,可以取代老钢种。     

高强韧性热作模具钢4Cr3MoWVSiRE的性能

通过试验,本文对高强韧性热作模具钢4Cr3MoWVSiRE的室温、高温性能及使用结果进行了较全面的介绍,并与老钢种3Cr2W8V作了对比。结果表明该钢种综合性能,优于3Cr2W8V钢,用该钢制造的齿轮锻模,使用寿命较3Cr2W8V钢锻模提高一倍以上。     

新型热作模具钢的试验研究

对新型热作模具钢4Cr2Mo2MnVNbB作了全面性能试验,并与老钢种3Cr2W8V进行对比及应用考核,证明本钢种的综合性能较高,使用寿命长,可以更替3Cr2W8V钢,其应用价值显著,可供有关部门选用。     

稀土对3Cr8Si2钢的耐热性能和耐腐蚀性能的影响

研究了在相同的试验条件下,于3Cr8Si2钢中添加微量稀土元素和不加稀土元素情况下的耐热性能和耐腐蚀性能的情况。结果表明,在3Cr8Si2钢中添加微量稀土元素后,可使其耐热性能提高2.5倍以上,耐腐蚀性能提高约2倍。将添加稀土元素的3Cr8Si2钢制成的工业炉烟道转动闸门,经批量的工业性试验证明,其使用寿命长,经济效益显著。     

用于铝合金的两种热挤压模具材料的比较

H13模具钢(4Cr5MoSiV)是我国近年来从国外引进的新钢种,作为铝合金热挤压模具材料得到广泛应用。但是H13钢与国内自五十年代以来就一直沿用的铝合金热模材料3Cr2W8V钢相比较,究竟哪种钢的工作性能优异,目前尚无定论。本文根据铝合金热挤压模的服役要求,对H13钢和3Cr2W8V钢的工作性能进行全面分析,系统的比较,从而得出明确的结论:H13钢的综合性能较3Cr2W8V钢为优,更适合作铝合金的热挤压模具材料。这为推广H13钢的应用提供了理论依据。     

炉卷轧机的新型炉内卷筒的研制

摘自《冶金设备》1983年第6期,北京钢铁设计研究总院、西安冶金机械厂设计研制小组的文章: 采用了新钢种采用4Cr25Ni20Si2作为卷筒用钢,和国内某厂炉内卷筒曾用过的钢种相比,持久强度大6～10倍,蠕变极限强度大5～7倍。该钢种强度高、抗氧化性能好、节省用镍量。改进了卷筒的结构     

4Cr2WMoVSi热作模具钢的研究与应用

以多元少量的合金化原则设计的4Cr2WMoVSi钢是一种经济型热作模具钢,研究了4Cr2WMoVSi钢的热处理工艺及性能,并与3Cr2W8V钢的热处理工艺和性能作了对比,用4Cr2WMoVSi钢制作了热剪刃,进行了装机使用试验,其使用寿命与3Cr2WSV剪刃的寿命相当,而是5CrW2Si剪刃寿命的3．4倍。     

高强韧性热作模具钢4Cr3MoWVSiRE的力学性能

本文对高强韧性热作模具钢4Cr3MoWVSiRE的室温、高温力学性能进行了较全面的试验,并与老钢种3Cr2W8V作了对比。结果表明该钢种综合力学性能高于老钢种。     

AOD炉冶炼含氮不锈钢氮合金化工艺开发

介绍了AOD炉运用氮气在不锈钢中溶解与脱除理论所开发的氮合金化工艺。在40tAOD炉上冶炼0Cr19Ni9N,0Cr19Ni9NbN,1Cr17Mn6Ni5N,00Cr18Ni5Mo3Si2（N）,00Cr22Ni5Mo3N等舍氮不锈钢钢种。不需在线分析钢中氮含量，较为准确地预测与控制钢中氮溶解度值及舍氮不锈钢成品的氮含量。     

锋利度持久刀剪用4Cr10Si2马氏体不锈钢的研制

在简介了国内外刀剪材料的发展现状后,根据钢的合金化原理和Schaeffler图设计出了4Cr10Si2钢的化学成分.试验制备出6 mm厚的4Cr10Si2钢板材并进行了退火.在对此板材进行了硬度、金相组织、室温拉伸、EBSD分析等测试后,进行了热处理工艺试验,确定了制作厨用切刀的热处理工艺参数范围.以其较佳热处理工艺制度处理出的试样作了抗弯强度及抗电化学腐蚀性能的对比试验,用该钢制成了厨用切刀.对刀具进行质量检测和试用结果表明,除抗电化学腐蚀性能指标Ecorr和Jcorr略低于4Cr13钢外,其余各项性能均优于此钢种.     

硅对铁素体耐热不锈钢组织与性能的影响

 18Cr-Al-Si铁素体耐热不锈钢作为一种结构连接件的新型材料,主要应用于超(超)临界火力发电领域。为了明确硅含量对该钢组织和性能的影响,以18Cr-Al-Si铁素体耐热不锈钢为成分基础,施以添加2组不同成分的硅含量,通过室温拉伸和高温氧化等试验方法,同时借助金相显微镜(OM)、扫描电子显微镜(SEM)和X射线衍射仪(XRD)等表征手段,对不同硅含量试验钢组织和性能进行了系统分析。结果表明,硅含量的增加会细化铁素体的晶粒尺寸并增加M₂₃C₆碳化物的数量,试验钢的抗拉强度和屈服强度升高,伸长率下降,断裂方式由韧性断裂向韧-脆混合型断裂方式转变;1.35Si试验钢氧化增重较大,因其钢中析出的M₂₃C₆碳化物较多,减少了固溶于基体及形成氧化膜的Cr含量,降低了其抗高温氧化性。     

Cr对无取向硅钢磁性能的影响

分析了钢中Cr的氧化、氮化反应热力学,试验研究了0.025%～0.045%Cr对900℃退火+750～1 050℃二次退火的0.5 mm无取向硅钢(%:0.001 8C、0.45Si、0.45Mn、0.106P、0.003S、0.001 2N)磁性能的影响。结果表明,钢中含Cr氮化物析出温度为913 K,在热轧精轧和卷取过程中析出;随钢中Cr含量的增加,钢的晶粒尺寸减少,铁损中的磁滞损耗增加,而涡流损耗变化不大,为保证钢的电磁性能,应控制钢中Cr含量≤0.03%。     

Microstructure,Mechanical Properties,and Abrasive Wear Behaviour of Si‐Mn‐Cr‐B Cast Steel as a Function of Carbon Concentration

The microstructures, mechanical properties and abrasive wear behaviour of five kinds of Si‐Mn‐Cr‐B cast steels were studied. The steels investigated contained X wt.% C with X= 0.15, 0.25, 0.35, 0.45, 0.55, 2.5 wt.% Si, 2.5 wt.% Mn, 0.5 wt.% Cr, 0.004 wt.%B . The results showed that the A_c1temperatures increased and A_c3 and M_s temperatures decreased with increasing carbon concentration. From the continuous cooling transformation (CCT) curves, it was discovered that the incubation period of pearlitic transformation was prolonged and the transformation curves of pearlite and bainite were separated significantly with rising carbon concentration. At lower carbon concentration, the normalized structure of Si‐Mn‐Cr‐B cast steel consisted mainly of granular bainite and M‐A islands. The normalized microstructures of the cast steel changed from granular bainite gradually to needle‐like bainite, upper bainite, and lower bainite with rising carbon concentration. The tensile strength and hardness of Si‐Mn‐Cr‐B cast steel increased and impact and fracture toughness decreased with increasing carbon content. The wear testing results showed that the wear resistance of Si‐Mn‐Cr‐B cast steel improved with higher carbon content but was obviously unchanged beyond the carbon concentration of 0.45%. The best balance of properties of Si‐Mn‐Cr‐B cast steel is obtained at the carbon concentration range of 0.35 ‐ 0.45%C.     

Microstructure and Mechanical Properties of Martensitic Stainless Steel 6Crl5MoV

 Martensitic stainless steel containing Cr of 12% to 18% (mass percent) are common utilized in quenching and tempering processes for knife and cutlery steel. The properties obtained in these materials are significantly influenced by matrix composition after heat treatment, especially as Cr and C content. Comprehensive considered the hardness and corrosion resistance, a new type martensitic stainless steel 6Cr15MoV has been developed. The effect of heat treatment processes on microstructure and mechanical properties of 6Cr15MoV martensitic stainless steel is emphatically researched. Thermo-Calc software has been carried out to thermodynamic calculation; OM, SEM and TEM have been carried out to microstructure observation; hardness and impact toughness test have been carried out to evaluate the mechanical properties. Results show that the equilibrium carbide in 6Cr15MoV steel is M23C6 carbide, and the M23C6 carbides finely distributed in annealed microstructure. 6Cr15MoV martensitic stainless steel has a wider quenching temperature range, the hardness value of steel 6Cr15MoV can reach to HRC 608 to HRC 616 when quenched at 1060 to 1100 ℃. Finely distributed carbides will exist in quenched microstructure, and effectively inhabit the growth of austenite grain. With the increasing of quenching temperature, the volume fraction of undissolved carbides will decrease. The excellent comprehensive mechanical properties can be obtained by quenched at 1060 to 1100 ℃ with tempered at 100 to 150 ℃, and it is mainly due to the high carbon martensite and fine grain size. At these temperature ranges, the hardness will retain about HRC 592 to HRC 616 and the Charpy U-notch impact toughness will retain about 173 to 20 J. A lot of M23C6 carbides precipitated from martensite matrix, at the same time along the boundaries of martensite lathes which leading to the decrease of impact toughness when tempered at 500 to 540 ℃. The M3C precipitants also existed in the martensite matrix of test steel after tempered at 500 ℃, and the mean size of M3C precipitates is bigger than that of M23C6 precipitates.     

热处理工艺对新型Cr8Mo2VSi和D2冷作模 具钢扁钢组织和力学性能的影响

 研究了热处理工艺对高碳、高铬冷作模具钢Cr8Mo2VSi和D2钢的组织和性能的影响,结果表明：Cr8Mo2VSi比D2钢的碳化物更细小、均匀;1020～1040 ℃淬火,Cr8Mo2VSi的硬度略低于D2,经高温回火后,Cr8Mo2VSi钢表现出更好的二次硬化效应,其硬度高于D2钢1~2（HRC）,并且比D2钢具有更好的强、韧性配合。     

济钢干熄焦焦罐衬板的选用

对耐热不锈钢20X23H18、耐热铸铁RTCr16、中铬铸钢ZG3Cr7Si2三种材质进行性能和价格比较,最后选用ZG3Cr7Si2制造。     

G8Cr15轴承钢的工业化应用分析

降低高碳铬轴承钢中的网状、带状碳化物等不利因素,有利于提高轴承钢的综合性能。G8Cr15是新纳入到国家标准中的轴承钢,通过系列试验,对比传统GCr15轴承钢和新的G8Cr15轴承钢的各项性能。结果表明,与GCr15轴承钢相比,G8Cr15轴承钢生成网状碳化物和带状碳化物的能力极低,同时具有更高的淬透性、良好的冲击性能和耐磨性。经工业生产验证,G8Cr15可替代GCr15用于生产轴承零件,且不易产生网状碳化物。     

16Cr20Ni14Si2耐热钢成分对高温力学性能的影响

16Cr20Ni14Si2属于经典耐热钢牌号,标准中碳、锰、硅控制范围较宽,元素含量的高低对钢的力学性能和高温性能有着明显的影响。为了了解碳、锰、硅元素等对16Cr20Ni14Si2耐热钢性能的影响,通过不同碳、锰、硅含量试验钢的力学性能比较,以及Thermal-Calc析出相计算与比较,初步了解这些元素在钢中的作用及对力学性能的影响。试验数据表明,700℃以下拉伸时,碳、锰、硅元素的含量对16Cr20Ni14Si2耐热钢高温屈服强度和抗拉强度有较大影响。