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9%Ni钢薄板焊条电弧焊弯曲试验开裂分析及改善 被引量:1
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作者 戴光明 江国焱 +2 位作者 尹东杨 李浩然 王苗苗 《电焊机》 2023年第5期70-76,共7页
LNG船用9%Ni钢进行薄板(≤5 mm)焊接时,横向弯曲试验易产生开裂。采用有限元分析与工艺试验相结合的方式,研究X7Ni9钢薄板采用焊条(ENiCrMo-6)电弧焊工艺进行焊接后,在执行接头横向弯曲试验时弯曲拉伸面易产生超标开裂(弯曲面裂纹长度≥... LNG船用9%Ni钢进行薄板(≤5 mm)焊接时,横向弯曲试验易产生开裂。采用有限元分析与工艺试验相结合的方式,研究X7Ni9钢薄板采用焊条(ENiCrMo-6)电弧焊工艺进行焊接后,在执行接头横向弯曲试验时弯曲拉伸面易产生超标开裂(弯曲面裂纹长度≥3 mm)甚至是试样断裂的原因。结果表明:弯曲拉伸面开裂的主要原因是母材和焊材为异质材料,其屈服强度差异大,当试板厚度过小时,横向弯曲试验过程中焊缝金属弯曲面过度拉伸,超过4倍厚度弯心的试验标准要求,被强制拉裂,导致评价失真;采用ENiCrMo-6系焊材进行根部焊道焊接时,当焊缝熔合情况不好时,易在该区域产生气孔缺陷,其与弯曲过程中产生的外表面开裂共同作用下会导致整个试样的断裂。工艺改进措施为:采用窄而厚的焊缝形态,增加单层的排道数量,从而增加焊缝整体宽度,以此保证焊缝考察面受拉伸时具有足够的塑性储备;通过控制焊道成形保证焊缝的熔合情况(根部焊道背面微透),以减少焊缝内部的气孔缺陷。 展开更多
关键词 9%ni EniCrMo-6焊条 薄板 横向弯曲 裂纹
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液化天然气储罐9% Ni钢板表面麻点成因及控制 被引量:1
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作者 王凯锋 刘春 刘永腾 《石油化工设备》 CAS 2018年第1期64-67,共4页
对液化天然气内罐用9% Ni钢板在轧制后表面出现的麻点成因及控制措施进行了详细介绍,对影响其表面质量的坯料处理、加热、除鳞及轧制等环节进行了综合分析,通过采取改进工艺、加强管理等措施后,达到了提升表面质量及生产出客户满意产品... 对液化天然气内罐用9% Ni钢板在轧制后表面出现的麻点成因及控制措施进行了详细介绍,对影响其表面质量的坯料处理、加热、除鳞及轧制等环节进行了综合分析,通过采取改进工艺、加强管理等措施后,达到了提升表面质量及生产出客户满意产品的最终要求。 展开更多
关键词 储罐 液化天然气 9% ni钢板 表面麻点 防氧化涂料 控制
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液化天然气储罐9%Ni钢板超声检测问题探讨 被引量:2
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作者 王凯锋 《压力容器》 北大核心 2018年第11期68-72,共5页
液化天然气(简称LNG)全容储罐由混凝土外罐与金属内罐组成,内罐是直接储存LNG的设备,决定着整个储罐的安全与稳定性,作为内罐关键材料的9%Ni钢板,其内部质量直接影响钢板的结构性能。基于国内某LNG项目,从9%Ni钢板超声检测标准、检测方... 液化天然气(简称LNG)全容储罐由混凝土外罐与金属内罐组成,内罐是直接储存LNG的设备,决定着整个储罐的安全与稳定性,作为内罐关键材料的9%Ni钢板,其内部质量直接影响钢板的结构性能。基于国内某LNG项目,从9%Ni钢板超声检测标准、检测方式、合格级别及流程进行了论述,同时对于检测时机的选择及5 mm薄板检测条件、缺陷的识别及判定进行了分析,以排除风险,确保出厂钢板满足技术要求。 展开更多
关键词 9%ni钢板 超声检测 5mm薄板 缺陷
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液化天然气储罐用国产9% Ni钢钢板技术调研分析与评价 被引量:6
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作者 张国信 《石油化工设备技术》 CAS 2013年第1期24-28,2,共5页
调研组对国内4家钢厂试制(或生产)9%Ni钢钢板的情况进行了技术调研。文章对国产9%Ni钢钢板的冶炼工艺、力学性能、工艺性能、焊接性能等进行了综合分析,同时与进口9%Ni钢钢板进行了全面的技术比较。针对国产9%Ni钢钢板需要提高的方面,... 调研组对国内4家钢厂试制(或生产)9%Ni钢钢板的情况进行了技术调研。文章对国产9%Ni钢钢板的冶炼工艺、力学性能、工艺性能、焊接性能等进行了综合分析,同时与进口9%Ni钢钢板进行了全面的技术比较。针对国产9%Ni钢钢板需要提高的方面,以及与9%Ni钢钢板国产化相关的问题提出建议。 展开更多
关键词 液化天然气 储罐 国产化 9% ni钢钢板
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Effect of Tempering Temperature on Microstructure and Mechanical Properties of Steel Containing Ni of 9% 被引量:10
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作者 ZHAO Xi-qing PAN Tao +3 位作者 WANG Qing-feng SU Hang YANG Cai-fu YANG Qing-xiang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第5期47-51,58,共6页
Mechanical properties of quenching,intercritical quenching and tempering (QLT) treated steel containing Ni of 9% were evaluated from specimens subject to various tempering temperatures. The detailed microstructures ... Mechanical properties of quenching,intercritical quenching and tempering (QLT) treated steel containing Ni of 9% were evaluated from specimens subject to various tempering temperatures. The detailed microstructures of steel containing Ni of 9% at different tempering temperatures were observed by optical microscope (OM) and transmission electron microscope (TEM). The volume fraction of austenite was estimated by XRD. The results show that high strength and cryogenic toughness of steel containing Ni of 9% are obtained when the tempering temperature are between 540 and 580 ℃. The microstructure keeps the dual phase lamellar structure after the intercritical quenching and there is cementite created in the Ni-rich constituents when tempering temperature is 540 ℃. When tempering temperatures are between 560 and 580 ℃,the reversed austenites (γ′) grow up and the dual phase lamellar structure is not clear. The γ′ becomes instable at 600 ℃. When tempered at temperature ranging from 500 to 520 ℃,the increase of dislocation density in the lamellar matrix makes both tensile strength and yield strength decrease. When tempered at 540 ℃ and higher temperature,the yield strength decreases continuously because the C and alloying elements in the matrix are absorbed by the cementite and the γ′,so the yield ratio is decreased by the γ′. There are two toughness mechanisms at different tempering temperatures. One is that the precipitation of cementite absorbs the carbon in the steel which plays a major role in improving cryogenic toughness at lower temperature. Another is that the γ′ and the purified matrix become major role at higher tempering temperature. When the tempering temperature is 600 ℃,the stability of γ′ is decreased quickly,even the transformation takes place at room temperature,which results in a sharp decrease of Charpy-V impact energy at 77 K. The tempering temperature range is enlarged by the special distribution of cementite and the lamellar structure. 展开更多
关键词 steel containing ni of 9% tempering temperature CEMENTITE reversed austenite cryogenic toughness
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The Influence of Welding Parameters on Brittle Fracture of Liquefied Natural Gas Storage Tank Welded Joint 被引量:2
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作者 Abd El Fattah Mustafa Khourshid Mohamed Ahmed Ghanem 《Materials Sciences and Applications》 2013年第3期198-204,共7页
Many applications operate at sufficiently low temperature conditions where most structural steels become very brittle and, therefore, unsuitable for use in safety-critical structures. So the materials used in the vess... Many applications operate at sufficiently low temperature conditions where most structural steels become very brittle and, therefore, unsuitable for use in safety-critical structures. So the materials used in the vessels or storage tanks which keep the natural gas at liquefaction temperatures need to remain ductile and crack resistant with a high level of safety. The material also needs to have high strength in order to reduce the wall thickness of the container and it must permit welding without any risk of brittle fracture. 9% Ni steel plates are one of most common used materials in the LNG storage tank application. However, the welding procedure for 9% Ni steel plates requires high level of skills of welding that is strictly controlled welding parameter for balancing avoidance of cold and hot cracking and maintenance of high strength. Mechanical properties are important characteristics of the weldment that must confirm to the application feasibility as well as functional requirements of the welded joint. The only way to enhanced the mechanical properties of welded joint by controlling the parameters of using welding process. From the main variables of the arc welding process are the heat input and interpass temperature where the two variables control the thermal cycle of welding process. The experiment show that for thin test specimen with thickness ≤ 14 mm, the heat input range from 1.4 to 2 KJ/mm and controlling interpass temperature within 80°C give high tensile strength with improving the toughness properties of welded joint and reduce the probability of brittle fracture happened by increase the ductility and reduce the yield strength and increased the transition temperature. 展开更多
关键词 9% ni steel plate LNG TANK Heat INPUT Mechanical Properties WELDING Process and BRITTLE FRACTURE
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