AISI 201奥氏体不锈钢低温离子渗碳

利用低温等离子体辉光放电技术对AISI 201奥氏体不锈钢进行低温离子渗碳(DCPC)处理,处理后的不锈钢表面可以形成一层无碳化铬析出的碳的过饱和固溶体(SC相)。由于渗入钢中的过饱和碳原子引起奥氏体晶格发生畸变,结果使渗层的硬度和耐蚀性都有较大幅度的提高。     

油田钻具接头用钢AISI4330M的研制

文章介绍了油田钻具接头用钢AISI4330M钢冶炼及加工研制生产工艺,分析了生产过程各工艺生产控制要点,并对生产及用户使用中容易产生的非金属夹杂物及残余元素含量超标、淬火处理开裂、调质性能不合格等质量问题进行了逐项分析,提出了针对各项质量问题的控制措施。     

制冷剂R32的循环性能实验研究

R32由于具有环境性能优越,如ODP为零、GWP值小于R410A等优点,逐渐被认识到可以用于替代R410A。本文对R410A和R32的循环性能进行实验研究,结果表明,在不同的工况下,采用2种制冷剂时系统运行的压比基本相同,COP几乎相同。与R410A系统相比,R32系统的压缩机耗功略高,制冷量高,且排气温度高。总之,R32具有良好的热物性、环境性能及循环性能,具有极大的替代R410A的潜力。     

Development of the steel AISI 4145HM for senior petroleum drill of BX Steel

The Steel AISI 4145HM for senior petroleum drill of BX Steel was produced by the follow sheet: hot metal pretreatment→converter→LF→RH→caster 350 mm×470 mm rectangular billet→hot delivery→reheating→800 mill rolling→insulation→straightening→anneal→grinding→inspection→packaging and pay into treasury→shipment.Selected BX Steel particular hor metal,adopted hot metal desulphurization pretreatment technology.The LF refining making the white slag,and keep a certain time.The RH treatment must make sure the vacuum degree and refining time,more importantly controlling argon blowing process.In addition,must design proper technology data continuous casting similar superheat,casting speed,and specific water flow rate.Depend on technological measures,the product been had series of the qualities:homogeneity of chemical composition,low content of harmful elements,high purity,compact organization.Adopted the process of casting billet hot delivery and hot charging,used stepping heating furnace,and designing reasonable thermal parameters.Two -high reversing mill rough rolls preparation square billet,short - stress - path rolling mill rolls round bar.Steel products bad holding and controlling soaking time and temperature. Steel products bad annealed,and annealing process must been controlled for ensuring steel hardness uniform. For avoiding residual stress,steel been straightened before anneal.The test results and using effect shows that the producing with uniform annealing hardness and nice processing properties,nice overall mechanical properties,were recognized by users.     

Experimental study of gas engine driven air to water heat pump in cooling mode

Nowadays a sustainable development for more efficient use of energy and protection of the environment is of increasing importance. Gas engine heat pumps represent one of the most practicable solutions which offer high energy efficiency and environmentally friendly for heating and cooling applications. In this paper, the performance characteristics of gas engine driven heat pump used in water cooling were investigated experimentally without engine heat recovery. The effects of several important factors (evaporator water inlet temperature, evaporator water volume flow rate, ambient air temperature, and engine speed) on the performance of gas engine driven heat pump were studied in a wide range of operating conditions. The results showed that primary energy ratio of the system increased by 22.5% as evaporator water inlet temperature increased from 13 °C to 24 °C. On the other hand, varying of engine speed from 1300 rpm to 1750 rpm led to decrease in system primary energy ratio by 13%. Maximum primary energy ratio has been estimated with a value of two over a wide range of operating conditions.     

稀土尾矿中萤石、重晶石浮选分离研究

内蒙古某多金属矿尾矿含CaF216.67%、SiO2 32.84%、CaCO3 8.52%,属于典型的高硅高碳酸钙难处理萤石矿。本研究针对该尾矿,采用碳酸钠为活化剂、水玻璃为抑制剂、BK410为捕收剂,进行了萤石综合回收的试验研究。最后采用一次粗选、一次扫选和十次精选——中矿单独处理工艺流程,可以获得含CaF2 95.10%、回收率46.97%的高品位萤石精矿Ⅰ和含CaF2 85.35%,回收率10.12%的萤石精矿Ⅱ。     

AISI 316L奥氏体不锈钢低温离子-气体渗碳工艺优化

目的将低温离子-气体乙炔渗碳应用于AISI 316L奥氏体不锈钢表面硬化处理,同时探讨其硬化处理的最优工艺参数及优化效果。方法采用离子轰击去除不锈钢表面钝化膜并活化其表面,再进行低温气体乙炔渗碳,实验过程使用脉冲式供气循环处理方式。进行温度梯度实验,寻找渗碳处理的临界温度。并采用正交试验法设计3因素3水平共9组实验,分析气体比例、离子轰击时间、保温压强3个因素对渗碳层硬度和厚度产生的影响,以期得到不锈钢低温离子-气体乙炔渗碳优化工艺。通过对经过最优化工艺处理过后的不锈钢硬化层组织、成分、厚度、硬度、耐磨性、耐蚀性能的研究分析,验证此工艺对AISI 316L奥氏体不锈钢硬化处理的适用性。结果处理温度为540℃时渗碳层有碳的铬化物析出;离子轰击时间对渗碳层硬度影响最大,保温压强对硬化层厚度影响最明显。在硬化处理温度为520℃,V(H2)∶V(C2H2)=1∶1,渗碳压强为-0.02 MPa,离子轰击时间为20 min时,316L奥氏体不锈钢离子-气体乙炔渗碳效果最优。经优化工艺处理后不锈钢硬化层厚度达到30μm左右,表面硬度达到838HV0.05,耐蚀性和耐磨性能等都显著提高。结论低温离子-气体乙炔渗碳硬化处理适用于AISI 316L奥氏体不锈钢,其处理最合适温度为520℃。经优化工艺处理后的不锈钢具有较高的硬度、厚度,良好的硬度梯度,高耐蚀性能及高耐磨性能。     

410S热轧带钢氧化皮结构对酸洗效果的影响

热轧带钢氧化皮结构是影响其酸洗效果的重要因素。以410S铁素体不锈钢为研究对象,研究其热轧带钢表面氧化皮的结构和组成物相,分析其对酸洗效果的影响。     

智能压力传感系统的设计

本文设计了一种以C8051f410微处理器为核心的智能压力传感系统。系统采用压阻式压力传感器,在电路设计中,采用恒流源、差动放大电路和高性能集成温度传感器DS18620等来减小温度等环境因素对传感器的影响,采用软件补偿来修正传感器温漂及非线性。实践证明,该压力传感系统具有精度高、抗干扰能力强等特点。