X70管线钢的气体保护焊试验研究

本文按照“西气东输”管线钢焊接技术条件，对武钢开发研制的板厚为10．3mmX70管线钢进行了气体保护焊试验。焊接材料为高韧性气保焊丝WER60及富氩保护气体。研究结果表明，焊缝具有优良的强韧性匹配，焊接接头强度及冲击韧性均满足管线钢工程焊接技术条件。     

铁路车辆用GR65钢焊接性能研究

进行了29mm规格铁路车辆用GR65钢焊接性能研究,结果表明:GR65钢具有优良的抗裂性能,热影响区淬硬倾向较小。匹配WER60焊丝采用富氩气体保护焊接,焊缝组织为针状铁素体+少量的晶内先共析铁素体,焊接接头强度605MPa,焊缝-40℃冲击功达到171J,远高于技术条件要求。     

压力容器钢焊接接头组织与力学性能的研究

随着我国压力容器用钢中的16MnDR钢板被国际权威机构ASME纳入到它的材料标准中,16MnDR钢板具有更加广阔的发展前景.本文根据不同的焊丝匹配原则,选取等强焊丝ER49-1、高强焊丝ER69-1,采用混合气体保护焊的方法制备焊接接头,采用金相显微镜、扫描电镜、冲击试验机、显微硬度计对接头的组织与力学性能进行研究.结果表明:ER49-1焊丝焊缝区的显微组织为针状铁素体和先共析铁素体,ER69-1焊丝焊缝区的显微组织为板条贝氏体和马氏体组织,ER49-1断口形貌为韧窝状断口,ER69-1断口为解理断口为主+少量韧窝断口.     

WQ-1高韧性埋弧焊丝焊缝金属强韧性的研究

本文采用示波冲击试验方法，对武钢技术中心开发研制的WQ-1高韧性埋弧焊丝的焊缝金属强韧性进行了研究。试验结果表明，WQ-1焊丝与SJ101焊剂匹配用于14MnNbq桥梁钢的焊接，焊缝金属具有较强的抗裂纹扩展能力，从20℃到-40℃的试验温度范围内，阻止裂纹形成的能力保持在较高水平，焊缝的脆性转变温为-45℃。焊缝金属具有高的低温冲击韧性，适用于低温冲击要求较高的桥梁、管线等大型工程结构的焊接。     

WNQ690低屈强比桥梁钢复合焊接工艺研究

按照工程提出的焊接技术条件,对武钢生产的大跨度低屈强比WNQ690桥梁钢(40mm)厚板进行了复合焊接工艺与性能试验。研究结果表明:采用埋弧焊丝WGX2+富氩气保护焊WER70NH焊丝匹配WNQ690钢厚板,接头具有优良的综合性能,焊缝力学性能达到了大跨度桥梁制造焊接技术要求。     

高韧性厚规格X80管线钢组织与性能

通过低碳微合金设计,LF＋VD复合精炼,控轧控冷等技术,开发了高韧性厚规格X80管线钢。检测了X80管线钢钢板及直缝埋弧焊管的力学性能,结合金相对微观组织进行检测。结果表明,开发的X80管线钢屈服强度均达到600MPa以上,屈强比小于0.93,具有优异的低温韧性,韧脆转变温度低于-60℃。直缝埋弧焊管管体组织较均匀致密,金相组织为B粒（贝氏体颗粒）＋PF（多边形铁素体）＋P（珠光体）,粒度达12级,夹杂物均控制在1.0级以内。     

X65管线钢抗硫化物应力腐蚀开裂性能研究

研究了化学成分和轧制工艺不同的4个批次X65管线钢抗硫化物应力腐蚀开裂(SSCC)性能,结果表明,应力加载大小对X65管线钢抗SSCC(四点弯曲)腐蚀性能影响较小,试样抗SSCC(四点弯曲)腐蚀性能与其微观组织密切相关。X65管线钢断口存在氢致裂纹,X65管线钢SSCC(四点弯曲)是以阴极氢脆机制为主的应力腐蚀,氢致开裂(HIC)破坏机理占主导作用,影响X65管线钢抗HIC腐蚀性能的因素同样影响其抗SSCC(四点弯曲)腐蚀性能。     

新一代炉壳钢LK490埋弧焊性能研究

对新一代长寿命高炉炉壳用钢LK490两种规格（36mm和65mm）厚板,采用WQ-1焊丝匹配CHF101焊剂进行埋弧焊对接性能试验。结果表明,两种规格厚板焊接接头常温拉伸强度和高温拉伸强度均满足LK490钢焊接技术条件,焊缝、熔合线和热影响区低温冲击功有较大的富余量,接头综合性能指标满足新一代高炉炉壳用钢焊接技术要求。     

X65管线钢在琼海、江津、青岛地区的五年大气腐蚀规律

开展武钢生产的X65管线钢在琼海、江津、青岛5年大气暴露腐蚀试验,得到了X65管线钢在三地的大气腐蚀速率的数据,实验结果表明试验钢在琼海站耐蚀性最好,江津站次之,青岛站最差。分析环境因素得出影响材料耐腐蚀性能的关键因素是SO2沉积率、H2S含量和SO2-4含量。通过数据回归拟合,得出X65管线钢在三个实验站的腐蚀规律均符合公式D=A·tn。     

不同温度下管线钢氢脆的多尺度综合试验研究

针对氢能源管道储运过程中的氢脆问题，设计电化学充氢条件下的X80管线钢临氢行为综合测试试验，实测温度对管线钢氢脆敏感性的影响。结果表明：氢扩散系数和钢内壁氢浓度随着温度的升高而增加；315 K下X80管线钢的断后伸长率及断面收缩率最小，氢脆指数最高；试样断口形貌呈脆性断裂特征。分子动力学模拟结果进一步表明，315 K下裂纹尖端的位错和孪晶释放极少，因此诱发了脆性扩展行为。     

高铝冷轧镀锌双相钢点焊工艺研究

通过正交试验法,采用L16（45）正交表对600MPa级高Al冷轧镀锌双相钢WHT600DPDZ点焊工艺参数进行优化,得到了工艺参数对焊点质量的影响规律,并采用极差分析法获得了WHT600DPDZ镀锌板点焊的最佳工艺参数。采用优化的最佳工艺参数进行WHT600DPDZ镀锌板焊接试验,焊点质量检测结果表明焊点具有优异的综合性能。     

Improving the Fatigue Performance of the Welded Joints of Ultra-Fine Grain Steel by Ultrasonic Peening

Contrast tests were carried out to study the fatigue performance of the butt joints treated by ultrasonic peening, aiming at the improvement of ultrasonic peening treatment(UPT) on welded joints of a new material. The material is a new generation of fine grain and high purity SS400 steel that has the same ingredients as the traditional low carbon steel. The specimens are in two different states:welded and ultrasonic peening conditions. The corresponding fatigue testing data were analyzed according to the regulation of the statistical method for fatigue life of the welded joints established by International Institute of Welding(IIW). Welding residual stress was considered in two different ways: the constant stress ratio R = 0.5 and the Ohta method. The nominalstress-number (σ-N) curves were corrected because of the different plate thickness compared to the standard and because there was no mismatch or angular deformation. The results indicated that: 1 ) Compared with the welded specimens, when the stress range was 200 MPa, the fatigue life of the SS400 steel specimens treated by ultrasonic peening is prolonged by over 58 times, and the fatigue strength FAT corresponding to 106 cycles is increased by about 66％; 2) As for the SS400 butt joint ( single side welding double sides molding) , after being treated by UPT, the nominal S-N curve (m = 10) of FAT 100 MPa(R =0.5) should be used for fatigue design. The standard S-N curves of FAT 100 MPa (R = 0.5, m = 10) could be used for fatigue design of the SS400 steel butt joints treated by ultrasonic peening.     

H_2S Stress Corrosion Tests of Welded Joint for X65 Pipeline Steel and Finite Element Numerical Analysis of Crack Tip

Theresistanceofapipelinesteeltohydrogensulfidestresscorrosioncracking (SCC)andhydrogen inducedcrack ing (HIC)isveryimportantforsteeltobeusedinsouroil/gasapplications.ElongatedMnSinclusionsarethemostsus ceptiblesitesforHICinitiation[1] ashydrogenatomscaneasi lyaccumulateattheinterfacebetweenthesteelmatrixandnon metallicinclusions.ThesegregationofsuchelementsasP ,Mn ,Cinthesteelenhancestheformationofhardbandsoncooling[2 ] .Theexistenceofthebandingstructurenotonlydecreasestheresistanceofthe…     

耐候钢焊接接头锈层稳定化大气曝晒加速试验

利用锈层稳定化处理的耐候钢焊接接头,进行了大气曝晒(喷淋)加速试验,结果证明:经表面复合处理剂处理后的Q450NQR1耐候钢,腐蚀率显著降低,不仅提高了耐蚀性,而且也提高了抗局部腐蚀能力。经表面复合处理剂处理的焊接接头与非焊接样的腐蚀试验结果没有差别,说明表面复合处理剂适用于焊接接头的锈层稳定化处理。     

利用废钢、废机铁生产球墨铸铁管件的试验研究

以废钢、废机铁及回炉料为主要原料,配以增碳剂和球化剂,通过中频炉熔炼,同步生产出了铁素体球墨铸铁管件及其Y形单铸试样。单铸试样的力学性能测试及金相组织观察结果表明:所生产的球墨铸铁其抗拉强度平均为455.0 MPa,屈服强度平均为328.2 MPa,布氏硬度平均为171.0 HBW,伸长率平均达到15.3%,优于GB/T 1348-2019中QT450-10的性能指标;基体组织为多边形铁素体,球状石墨分布均匀、圆整度较好、大小相差不大,有点状石墨存在,能够满足此类管件产品的性能要求。     

高强度核电用钢厚板手工焊性能研究

介绍了武钢首批试制的高强度核电用钢厚板手工电弧焊性能研究,按照第三代核电技术(AP1000)用钢提出的焊接技术条件,对36mm和48mm两种规格的核电用厚钢板进行了手工焊焊接性能试验,研究结果表明:采用E9018-G-H4R核电专用焊条匹配WHD585E钢厚板所得焊接接头综合力学性能优良,能满足第三代核电用钢提出的焊接技术条件。     

高强特厚板焊接施工工艺监造

通过对高强特厚板材料热影响区的脆化、冷裂纹和层状撕裂等焊接性能的分析,得出Q345GJC钢材焊接性能较差的结论.对高强特厚板焊接工艺质量控制要点进行了深入的研究,并应用于某超高层钢结构制作监造中,焊缝合格率达到100%,有效的保证了工程的质量.     

Distribution of Welding Residual Stress of Mixed Steel U-Rib-Stiffened Plates

To analyze the effects of width and thickness of each composition element of mixed steel U-rib-stiffened plates on the welding residual stress distribution, the distribution of the U-rib and the plate residual stress was calculated using a simplified calculation method. The method involved welding the mixed steel U-rib-stiffened plates for a structure with different sizes and different strength ratios of U-rib to plate. Based on a welding residual stress numerical simulation method validated by the blind hole method test, the distribution law of the mixed steel U-rib stiffened plate was studied. The results showed that the change of plate width has little impact on the welding residual stress and that the ratio of the thicknesses of the plate to U-rib stiffeners, the thickness of the plate, and the thickness of the U-rib has a great influence on the distribution of the welding residual stress. The thickness of plate and steel strength also greatly influenced the distribution width of the residual tensile stress. While analyzing the compression capacity of U-rib-stiffened plates, the simplified distribution of welding residual stress was used.