304不锈钢薄壁管焊接生产在线固溶处理工艺 |
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引用本文: | 渠慎全,秦国梁,高源,肖国栋.304不锈钢薄壁管焊接生产在线固溶处理工艺[J].焊接学报,2023,44(1):107-114. |
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作者姓名: | 渠慎全 秦国梁 高源 肖国栋 |
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作者单位: | 1.山东大学, 材料科学与工程学院, 济南, 250061 |
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摘 要: | 钢带经逐级卷板加工、焊接而制成钢管,因前期加工硬化导致钢管硬度增大,从而会显著影响管件的二次成形加工.文中通过在304不锈钢管生产线搭建在线固溶处理试验平台,研究了固溶温度、固溶冷却条件及固溶保护气种类对304不锈钢管焊缝和母材微观组织及性能的影响.结果表明,在试验温度范围内,提高固溶温度会使热影响区和母材晶粒度增大,促进碳化物固溶于奥氏体晶粒,明显降低热影响区和母材的硬度.焊缝区沿奥氏体晶界分布的铁素体部分溶解,晶粒尺寸增大程度较小,因此焊缝区的硬度略有降低;而调整冷却条件对焊缝及母材的硬度影响不大;在氩气作为固溶保护气时,调节固溶参数,管件母材平均硬度可降低至188.7 HV,与未固溶时相比降低了11.0%.在氢气作为保护气时,平均硬度可降低至182.7 HV,与未固溶时相比降低了13.8%.通过显微组织观察,硬度、扩口和压扁力学性能测试,在两种保护气条件下固溶处理的管件均满足国家标准.
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关 键 词: | 在线固溶处理 固溶温度 冷却条件 保护气种类 力学性能测试 |
收稿时间: | 2022-01-25 |
On-line solution treatment process for welding production of 304 stainless steel thin-walled tube |
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Affiliation: | 1.School of Materials Science and Engineering, Shandong University, Jinan, 250061, China2.Shandong Zhaori Stainless Steel Co., LTD, Weifang, 262618, China |
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Abstract: | The steel strip is made into steel tube by rolling and welding step by step. The hardness of the steel tube increases due to the early work hardening, which will significantly affect the secondary forming processing of the tube. In this paper, the effects of solution temperatures, solution cooling conditions and types of solution shielding gas on the microstructure and properties of 304 stainless steel thin-walled tube were studied by building an on-line solution treatment test platform in the 304 stainless steel tube production line. The results show that increasing the solution treatment temperature in the experimental temperature range will increase the grain size of the heat-affected zone and the base metal and promote the solid solution of carbides in and along the austenite grains, so as to significantly reduce the hardness of the heat-affected zone and the base metal. The ferrite distributed along the austenite grain boundary in the weld zone is partially dissolved, and the grain size increases to a small extent, so the hardness of the weld zone decreases slightly. However, adjusting the cooling conditions has little effect on the hardness of the weld and base metal. When argon is used as the solution treatment protective gas, the average hardness of the base metal of the tube can be reduced to 188.7 HV, which is 11.0% lower than that without solution treatment. When hydrogen is used as solution treatment protective gas, the average hardness can be reduced to 182.7 HV, which is 13.8% lower than that without solution treatment. Through microstructure observation, hardness test, flaring and flattening mechanical properties test, the solution-treated tubes under the two protective gas conditions all meet the national standards. |
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