马氏体耐热钢ZG1Cr10MoVNbN的焊接工艺

介绍了一种新型马氏体耐热钢ZG1Cr10MoVNbN的焊接工艺。通过分析ZG1Cr10MoVNbN材质铸钢的焊接特性,并通过工艺评定验证,确定了合理的焊接工艺,满足了焊缝的常温及高温力学性能。     

马氏体耐热钢 ZG1Cr10MoVNbN 的焊接工艺

介绍了一种新型马氏体耐热钢 ZG1Cr10MoVNbN 的焊接工艺。通过分析 ZG1Cr10MoVNbN 材质铸钢的焊接特性,并通过工艺评定验证,确定了合理的焊接工艺,满足了焊缝的常温及高温力学性能。     

ZG15Cr1Mo1V铸件热补焊技术

确定了ZG15Cr1Mo1V铸件的开裂位置为联合阀体R角位置。对缺陷周围的母材成分、组织和性能情况进行了检测,该铸件具备焊接修复条件。对ZG15Cr1Mo1V钢的焊接性及焊接修复要点进行了分析,采用同材质热补焊的工艺方法及整体热处理方式,成功对某电厂中压再热联合调阀ZG15Cr1Mo1V铸件进行了焊接修复,已安全稳定运行4年。     

热处理工艺对ZG15Cr2Mo1钢铸件焊接热影响区性能的影响

针对ZG15Cr2Mo1钢铸件焊接后热影响区硬度过高的问题,通过试块试验对比分析了不同焊后热处理工艺对试块焊接三区硬度及拉伸性能的影响,对铸件本体缺陷修复焊接后采用不同的焊后热处理工艺进行验证,确定了符合力学性能要求的ZG15Cr2Mo1焊后热处理工艺,在保证铸件本体拉伸性能的同时,焊接三区硬度不超过241HBW.     

1Cr21Ni5Ti锁底结构光纤激光焊接工艺特性

对3 mm厚的1Cr21Ni5Ti不锈钢锁底结构进行激光焊接试验,分析不同焊接工艺参数对接头成形、力学性能以及微观组织的影响,研究了其焊接工艺特性。结果表明,主要焊接缺陷为焊缝中的气孔以及收焊处凹坑,采用缓降功率的方法可减小焊缝收焊处凹坑深度,采用负离焦以及提高焊接速度有利于控制焊缝中的气孔缺陷。相比母材,焊缝硬度有所下降且不均匀,沿焊缝中心,焊缝中部区域硬度最高;在一定参数范围内,接头力学性能波动较小,焊缝平均抗拉强度达到816 MPa。焊缝内部晶粒呈等轴晶形式,主要由铁素体和奥氏体组成,焊缝中部奥氏体数量多于上部和下部,因此硬度较高;热影响区在焊接热循环作用下晶粒相对粗化,为焊缝的薄弱区域。     

ZG15Cr1Mo1V热强钢热处理工艺的改进

ZG15Cr1Mo1V钢在我厂用于生产汽轮机配件阀亮和调接阀壳。此钢属于热强钢，工作温度在350～620℃，该钢的化学成分及力学性能要求见表1、2。1ZG15Cr1Mo1V钢的热处理工艺ZG15Cr1MolV钢工件的铸态组织存在的气孔、偏祈、疏松等宏观缺陷必须通过热处理来消除，并细化晶粒、均匀组织，获得满意的珠光体＋铁素体组织，以满足工件力学性能要求。ZG15Cr1Mo1V钢原用热处理工艺如图1括号中所示，按原工艺处理配件的力学性能不合格，按修订后的热处理工艺生产则达到合格水平，结果见表3。2热处理工艺分析ZG15Cr1MolV钢按原热处理工艺处理结…     

ZG30Cr06A钢焊接工艺性及接头的力学性能研究

采用气体保护焊(GMAW)对30 mm的煤矿机械液压支架的柱窝材料ZG30Cr06A板进行了斜Y型坡口焊接裂纹试验和对接焊试验,研究了ZG30Cr06A钢的焊接工艺性和焊接接头的力学性能。结果显示,在室温条件下进行斜Y型坡口裂纹试验,裂纹率达100%;随着预热温度的增大,裂纹率逐渐降低,在预热温度为100℃及以上时,不会出现冷裂纹。在预热温度为150℃,对ZG30Cr06A钢板进行对接焊,焊缝未发现裂纹。对焊接接头进行拉伸性能、弯曲性能和冲击性能试验,各项性能均满足要求。     

12Cr1MoV钢硬度超标焊缝的组织性能研究及原因分析

通过力学性能测试、金相组织检验及扫描电子显微镜观察等分析了某火力发电机组12Cr1MoV钢硬度超标焊缝的显微组织和力学性能。试验研究结果表明:12Cr1MoV钢硬度超标焊缝的强度高、塑性低、冲击韧性较差;焊缝硬度超标是由于焊后热处理恒温温度不足所致;焊缝硬度超标会使该材料焊接接头产生再热裂纹的倾向增大,容易出现早期开裂失效;采用较小的焊接热输入、有效的焊后热处理、减少接头部位的应力集中是减少12Cr1MoV钢焊接接头再热裂纹的有效措施。     

10Cr9Mo1VNbN和ZG15Cr2Mo1异种钢焊接接头性能分析

通过残余应力测试、金相组织观察、维氏硬度测试等,分析10Cr9MoVNbN和ZG15Cr2Mo1异种钢焊接接头的综合性能。结果表明:焊后残余应力分布情况非常复杂,且焊板反面存在较大的拉应力,在热处理后显著降低;热处理后,存在明显的元素迁移现象,且随温度和时间的增加变得愈加明显;并对异种钢焊接接头的维氏硬度分布特征进行分析,评价异种焊接接头的力学性能。     

激光清洗对30Cr3超高强度钢表面及焊接质量的影响

为了研究激光清洗预处理对30Cr3超高强度钢焊接质量的影响,通过扫描电镜分别对清洗前后的表面形貌、元素组成及基体组织进行对比观察。结果表明,合适的激光清洗工艺可有效去除30Cr3超高强度钢待焊表面氧化层,使表面更加光滑平整,且不损伤基体材料。将激光清洗后的试验件进行电子束焊接,焊后观察其焊缝表面成形良好,无咬边、凹陷等缺陷,焊缝内部质量及力学性能均能达到要求。将焊接接头制成金相试片观察其显微组织形貌,激光清洗预处理后的焊接接头在低倍扫描电镜下焊缝成形饱满,没有出现裂纹、咬边等缺陷;通过高倍扫描电镜观察焊缝中心区域晶粒细小均匀。因此,30Cr3超高强度钢焊前采用激光清洗进行预处理可以有效清除待焊表面污染层,且焊接质量满足要求。     

12Cr1MoV

12Cr1MoV合金结构钢。统一数字代号：A31132。执行标准GB/T3077—1999。与12CrMoV钢相比,具有更高的抗氧化性及热强性。此钢的蠕变极限与持久强度值很接近,并在持久拉伸的情况下具有高的塑性;钢的工艺性与焊接性良好,但焊前需预热至300℃,焊后需除应力处理。是高压、超高压、亚临界电站锅炉过热器、集箱和主蒸气导管广泛采用的钢种。     

1Cr12和1Cr17不锈钢的耐酸性能实验研究

研究了高温高压环境1Cr12和1Cr17不锈钢的耐蚀性和酸化缓蚀液的匹配性。结果表明:1Cr12和1Cr17不锈钢在酸化液中的均匀腐蚀速率分别为14.82 mm·a~(-1)和12.56 mm·a~(-1),均低于相关标准;缓蚀液与不锈钢的匹配性较好,但不能防止点蚀;1Cr17不锈钢的耐蚀性比1Cr12的优异。     

ZG20Cr1与ZG20Cr1VRE钢的强韧性分析

通过试验证明 ,加入钒及稀土后的 ZG2 0 Cr1 VRE钢在常规力学性能、小能量多冲弯曲抗力、断裂韧性、耐磨性及使用件的应用等方面优于 ZG2 0 Cr1钢 ,并对强韧化机理进行了分析。     

1Cr18Ni9Ti与1Cr13不锈钢的焊接试验

通过钨极氩弧焊方法,对 1Cr18Ni9Ti 与 1Cr13 实施焊接.采用光学显微镜、扫描电镜对 1Cr13 马氏体型与 1Cr18Ni9Ti 奥氏体型不锈钢焊接接头进行金相组织、断口形貌观察及分析;利用显微硬度计、电子万能拉伸机测量焊接接头的力学性能;并通过海水模拟溶液浸泡试验,测量焊接接头极化曲线和交流阻抗谱.结果表明,通过手工钨极氩弧焊,采用直流正接接法,在合适的工艺下(焊接电流为 80 A,焊接速度为 110 mm/min),能够获得外观平整、组织均匀,力学性能与电化学性能符合要求的焊接接头.

Abstract：

The stainless steels of 1Cr18Ni9Ti and 1Cr13 were welded through deterministic craft by tungsten inert-gas (TIG) welding. The microstructure and fracture pattern of weld joints of 1Cr13martensite and 1Cr18Ni9Ti austenite stainless steels were observed and analyzed by means of LOM and SEM, the mechanical properties of the weld joints were measured with micro-hardness tester and electronic universal stretcher, and the polarization curves and AC impedance spectroscopy of weld joints were tested by seawater immersion test of simulation solution. The results show that adopting manual TIG welding through electrode negative to direct current soldering machine to weld 1Cr18Ni9Ti austenite stainless steel and 1Cr13 martensite stainless steel is feasible; under suitable process (welding current is 80 A, welding speed is 110 mm/min), weld joints can obtain good appearance and uniform structure; mechanical properties and galvano-chemistry properties can meet use requirements.     

1Cr18Ni9Ti和12Cr1MoVG的异种钢焊接

选用ENiCrFe-3型焊条,采用合理的焊接工艺,进行了奥氏体不锈钢和珠光体钢的现场焊接.     

12Cr1MoV-1Cr18Ni9Ti氩弧焊接工艺分析

分析了12Cr1MoV耐热钢与1Cr18Ni9Ti不锈钢的焊接工艺特点,介绍了采用焊材H1Cr24Ni13的氩弧焊接方法,对通过控制熔合比达到控制焊缝成分,改善和提高焊缝性能的工艺方法进行了讨论。     

Variability in Co2 Oxidation Resistance of 2 1/4 Cr 1 Mo and 1 Cr 1/2 Mo Steels

Abstract

Oxidation tests in CO₂ atmospheres on nominally identical casts of low alloy steels have revealed wide variation in oxidation resistance. A study has been made of the influence of chemical composition, mechanical and thermal treatment, and remelting on the CO₂ oxidation behaviour of steels of the 21/4 Cr 1 Mo and 1 Cr 1/2 Mo type.

Statistical analyses of CO₂ oxidation results have shown a strong positive correlation of oxidation rate with sulphur content in certain instances, but a number of anomalies have been found. A similar relationship has been obtained between ‘MnS’ content and oxidation rate by area count studies of the inclusions in a range of 2 1/4 Cr 1 Mo steels. These have also indicated a possible effect of ‘MnS’ particle size and particle size distribution which could account for some of the anomalous results obtained in the statistical work. Conventional solid state heat treatments appear to have no significant effect on the oxidation behaviour of 2 1/2 Cr 1 Mo and while remelting in argon did not generally improve oxidation behaviour, remelting in vacuo followed by forging and rolling resulted in a material of high oxidation resistance.     

1Cr18Ni9Ti与12Cr1MoV异种钢接头焊接工艺

针对热电厂50MW机组中主蒸汽管道管座（12Cr1MoV)与热电偶保护套管（1Cr18Ni9Ti)异种钢接头焊接问题，提出了以钨极氩弧焊H1Cr25Ni13焊丝封底，焊条电弧焊A307焊条填充盖面并适当控制焊缝熔合化的焊接工艺。实践证明，采用这种焊接工艺进行焊接，可以获得优良的焊缝，保证主蒸汽管道的安全运行。     

14Cr1MoR钢的焊接

根据14CrlMoR钢焊接性特点，为避免在焊接过程中出现冷裂纹、回火脆性等问题，对武汉钢铁厂研制的一种新型高韧性14CrlMoR钢的焊接性和焊接接头性能进行了试验研究，为今后大力推广此材料的应用提供了科学依据。     

Evaluation of repair welding procedures for 2.25Cr–1Mo and 9Cr–1Mo steel welds

Abstract

Chromium–molybdenum steels are extensively used in the steam generator circuits of power plants. These components may require welding of the cracks that can develop during fabrication, storage, and transportation stages, or during the service life of the plant. This investigation compares repair welding methods for Cr–Mo steels, using 2.25Cr–1Mo and 9Cr–1Mo materials. To simulate aging during service, welds were heat treated at 873 K for 5000 h. Simulated repair welding of the aged welds was carried out at the weld/base metal interface, i.e. at the location at which cracks are usually reported to occur during service. Two repair welding methods (half bead and butter bead temper bead methods) conforming to the ASME Boiler and Pressure Vessel Code were used. Tensile properties, hardness profiles, and X-ray diffraction based residual stress distributions were determined for both the Cr–Mo steel welds to evaluate the simulated repair welds. Analysis of the test results showed that both the repair welding methods can be used for 2.25Cr–1Mo steel welds, although the butter bead temper bead method is much more suitable for both the 2.25Cr–1Mo and 9Cr–1Mo steel welds.