0Cr18Ni9不锈钢管道低温焊接工艺

本文简要介绍了0Cr18Ni9在低温工况条件下的焊接工艺及常见缺陷的处理.     

电化学方法研究硫脲与烯丙基硫脲在盐酸介质中对不锈钢的缓蚀作用

用电化学方法研究了硫脲与烯丙基硫脲在1mol·dm~(-3)盐酸中对1Cr18Ni9Ti不锈钢在20℃的缓蚀作用。证实了硫脲与烯丙基硫脲的加入能提高1Cr18Ni9Ti在盐酸中缓蚀能力。对两种缓蚀剂的缓蚀能力的原因作了理论探讨,认为硫脲对1Cr18Ni9Ti不锈钢是阴极缓蚀剂,烯丙基硫脲即是阴极缓蚀剂又是阳极缓蚀剂。     

聚氯乙烯脱氯反应器金属内衬抗腐蚀性的研究

聚氯乙烯（PVC）在脱氯过程中会产生大量的HCl气体，而HCl具有很强的腐蚀性。对3种不锈钢（00Cr17Ni14Mo3（316L），0Cr18Ni9Ti（322），1Cr18Ni9（302））和紫铜（Cu≥99.9%）进行抗HCl气体腐蚀实验，并对试样进行扫描电镜（SEM）和能谱（EDS）分析。结果表明，不锈钢316L的抗HCl气体的腐蚀性能最好，紫铜最差。在本研究条件下，不锈钢316L最适合用来作PVC脱氯反应器的内衬。     

An active control study of the 1Cr18Ni9 steel plate multipoint excitation

A multipoint excitation experiment system of the 1Cr18Ni9 steel plate-pipe network as the main vibration body was established,which used transient flow produced by the wave exciter to excite the 1Cr18Ni9 steel plate-pipe network to vibrate.The experimental results show that the 1Cr18Ni9 steel plate vibrates in three dimensions.The vibrations of the particles of the steel plate distributing along the pipe’s axial have phase differences and take place near the cylinder side first.Therefore,it is a multipoint vibration mode.The amplitude of the 1Cr18Ni9 steel plate increases as the system pressure increases and decreases as the wave exciter’s frequency decreases.The vibration intensity of the particles of the 1Cr18Ni9 steel plate close to the cylinder is the strongest and the amplitude is the highest in Y direction at a given system frequency.The vibration intensity of the particles close to the wave exciter is the strongest and the amplitude is the smallest in Z direction at a given system pressure.     

Effect of sulphate-reducing bacteria on the electrochemical impedance spectroscopy characteristics of 1Cr18Ni9Ti

The electrochemical characteristics of 1Cr18Ni9Ti in sulphate-reducing bacteria (SRB) solutions and the biofilm of SRB on the surface of the 1Cr18Ni9Ti electrode were studied by electrochemical, microbiological, and surface analysis methods. Electro- chemical impedance spectroscopy (EIS) of 1Cr18Ni9Ti was measured in the solutions with and without SRB at the culture time of 2, 4, 8 d, respectively. The measurement used two test methods, the nonimmersion electrode method and the immersion electrode method. It was found that the polarization resistance (Rp) of 1Cr18Ni9Ti in the solutions without SRB is the greatest for each test method. When using the nonimmersion electrode method, Rp shifts negatively at first and then positively, and the time constant is only one. Although using the immersion electrode method, the Rp shifts positively at first and then negatively, and the time constant also changes when the biofilm forms. The biofilm observed through SEM is with pores. It was demonstrated that SRB has acceler- ated corrosion action on 1Cr18Ni9Ti. The protection effect of the biofilm on the electrode depends on the compact degree of the film.     

标准椭圆封头对薄壁内压圆筒承载能力的影响

试验研究表明：与圆筒等厚的标准椭圆封头,可提高钢制薄壁内压短圆筒的承载能力;得到确定0Cr13不锈钢制薄壁内压短圆筒屈服压力和爆破压力的经验公式,以及区分内压长、短圆筒的临界长度计算公式．采用0Cr18Ni9Ti不锈钢制薄壁内压圆筒的爆破压力试验数据验证了文中公式的有效性和合理性．     

标准椭圆封头对薄壁内压圆筒承载能力的影响

试验研究表明:与圆筒等厚的标准椭圆封头,可提高钢制薄壁内压短圆筒的承载能力;得到确定0Cr13不锈钢制薄擘内压短圆筒屈服压力和爆破压力的经验公式,以及区分内压长、短圆筒的临界长度计算公式.采用0Cr18Ni9Ti不锈钢制薄壁内压圆筒的爆破压力试验数据验证了文中公式的有效性和合理性.     

不锈钢温锻

本文研究了不锈钢 1Cr18Ni9Ti、Cr17Ni2、2Cr13、4Cr13和 Cr12Mn5Ni4MO3Al的温锻。在不锈钢温锻时,主要要解决不锈钢变形抗力大和粘模能力强两个问题。因此温锻温度的选择、温锻润滑剂的选择和润滑剂使用方法的确定,是解决不锈钢温锻的关键。在本文中,确定了上述几种不锈钢的适宜温锻温度,并且根据润滑剂摩擦系数的确定和生产实践中润滑效果的检验,推荐了合适的润滑剂和它的使用方法。     

1Cr18Ni9Ti钢板表面折叠的扫描电镜分析

利用扫描电镜和能谱分析仪分析1Cr18Ni9Ti钢中板半成品表面折叠处夹杂物和第二相的类别和分布，以探求折叠产生的起因．     

Properties of plasma sprayed NiCrAlY (ZrO_2 Y_2O_3) coating on refractory steel surface

1INTRODUCTION1Cr18Ni9Ti,i.e.188austeniticstainless steel,isakindofausteniticrefractorysteelwidely appliedinmanyfields,containingahighcontentofCrthatcanimproveheatandoxidationresistances,andalsoNicapableofformingastableaustenitic structure.However,suchstee…     

Semi-solid slurry preparation and rolling of 1Cr18Ni9Ti stainless steel

The preparation and rolling of the semi-solid slurry 1Cr18Ni9Ti stainless steel were researched. The experimental results show that when stirred for 2-3 min under the given test condition, the semi-solid slurry with about 50%-60% (volume fraction) solid and the spherical primary austenitic grains in the size of 100-200μm can be obtained, and it is easy to be discharged from the bottom little hole of the stirring chamber. The semi-solid slurry of 1Cr18Ni9Ti stainless steel can be rolled into the given plate successfully. However, the solid phase and liquid phase are easily separated in the rolling process, so that the solid primary austenitic grains are concentrated in the center and the liquid phase is near the edge of the rolled plate. The strengths of the plate rolled in the semi-solid state are higher than that of the traditionally repeated hot-rolled plate of 1Cr18Ni9Ti stainless steel.     

薄壁1Cr18Ni9Ti奥氏体不锈钢的焊接试验

采用钨极氩弧焊的方法,对0.8 mm厚的1Cr18Ni9Ti奥氏体型不锈钢板实施焊接,并通LOM,SEM方法对焊接接头组织及断口形貌进行观察及分析;利用显微硬度计、电子万能拉伸机测量了焊接接头的力学性能.结果表明,通过手工钨极氩弧焊,采用直流正接接法(焊接电流为20 A,焊接速度为20 m/h)能够获得外观平整、组织均匀、力学性能满足要求的焊接接头.     

00Cr18Ni10N钢高温持久强度的预测与验证

研究了00Cr18Ni10N钢的高温持久强度.在Larson-Miller方程基础上,利用全微分和状态函数特征,建立了00Cr18Ni10N钢在给定温度条件下持久强度与高温抗拉强度之间关系的数学模型.通过试验结果表明,利用该数学理论模型预测00Cr18Ni10N钢在700℃,持久拉伸200h理论与实测持久强度值相符,相对误差为0.6%.     

焦化氨水介质中0Cr17Ni12Mo2不锈钢电化学腐蚀行为研究

采用全浸动态挂片和极化曲线实验法研究0Cr17Ni12Mo2不锈钢在模拟现场工况条件下的腐蚀行为。结果表明,0Cr17Ni12Mo2试样的腐蚀速率随温度的升高不断加快;增大硫离子和氯离子浓度可使0Cr17Ni12Mo2试样腐蚀速率加快;氰根离子浓度不高于临界值时,试样腐蚀速率减缓,反之,腐蚀速率加快。     

不锈钢X射线应力测量

分析了2类不锈钢X射线的衍射特性.为判断奥氏体不锈钢扫描过程中出现的2个衍射峰能否作为应力测试的基础,在改建的残余应力测量平台上,应用自编的测量控制软件,基于衍射全过程的实时监测与处理功能,采用等强梁标定方法,对奥氏体不锈钢0Cr18Ni9(原始材料)、1Cr18Ni9Ti (去应力退火)及马氏体不锈钢(A335P92)3种材料进行多次测定,逐级加载的同时,分别采用X射线系统及电测法进行检测,通过与理论值进行综合对比,得出不锈钢的衍射特性.结果表明:奥氏体与马氏体不锈钢反映了不同的衍射特性;虽然奥氏体不锈钢(220)晶面127°的K_α衍射峰非常明显,且半高宽与抛物线2种定峰方法的精确度较高,但准确度差,由此峰计算出的应力与材料真实应力无关;而(311)晶面149°的K_β衍射峰虽然峰背比低、误差偏大,但经过应力常数修正后可作为应力测定依据;马氏体不锈钢表现出与α-Fe相近的衍射特性,其标定的应力常数与常规α-Fe的应力常数相差7.8%.     

Multilayer Clad Plate of Stainless Steel/Aluminum/Aluminum Alloy

The 3, 5, 20 layer clad plate from austenitic stainless steel, pure aluminum and aluminum alloy sheets were fabricated in different ways. The stretch and interface properties were measured. The result shows that 20 layer clad plate is better than the others. Well-bonded clad plate was successfully obtained in the following procedure: Basic clad sheet from 18 layer Al1060/Al3003 sheets was firstly obtained with an initial rolling reduction of 44% at 450 ℃, followed by annealing at 300 ℃, and then with reduction of 50% at 550 ℃ from STS304 on each side. The best 20 layer clad plate was of 129 MPa bonding strength and 225 MPa stretch strength.     

宽厚复合板热轧成形轧制力模型

为了有效提高宽厚复合板热轧成形质量, 以不锈钢与低合金钢层状复合结构材料为研究对象, 针对宽厚复合板结构复合及加工协同变形的技术要求, 制定宽厚复合板热轧成形工艺路线, 并对热轧宽厚不锈钢复合板成形轧制力模型进行研究.将热轧复合变形区分成Ⅰ、Ⅱ两个区段, 并依据热轧过程中轧制区间内金属流动变形规律, 确定各界面上摩擦切应力τ的方向, 进而推导出热轧不锈钢复合板成形轧制力计算公式.研究结果表明:该轧制力模型可准确预测轧制力的大小, 有效提高轧制力的计算精度.经轧制成形制造的不锈钢复合板满足设计技术要求, 制定工艺路线合理, 可用以指导生产实践.