影响不锈钢焊管在线光亮热处理的因素

介绍了引进的不锈钢焊管在线光亮热处理生产线,对影响不锈钢焊管在线光亮热处理的因素进行了分析.不锈钢焊管采用带保护气体的无氧化在线光亮热处理既改善了焊管质量,又省去传统的线外热处理及酸洗工艺.     

马氏体不锈钢的光亮热处理

简要介绍了马氏体不锈钢真空热处理和可挖气氛热处理两种光亮热处理的特点及其现场应用，生产实践证明，马氏不锈钢采用光亮热处理能最大限度地发挥材料和工艺技术优势。     

不锈钢高温处理用保护气氛

不锈钢高温处理用保护气氛苏州工业园区热处理设备厂（２１５１２６）瞿剑锋批量性不锈钢零件的固溶或淬火处理，已逐步改用保护气氛连续炉。这有利于提高零件处理质量、节约能源、减轻工人劳动强度和减少三废污染。不锈钢光亮热处理的保护气氛常采用氢气或氨分解气。某钢...     

马氏体不锈钢真空热处理表面质量优化研究

本文针对马氏体不锈钢在真空热处理过程中表面出现氧化增碳的问题,开展了钝化、机加工、热处理、设备选型等方面的工艺试验,通过进行力学性能、金相组织、外观质量的分析检测,制定了工艺优化措施。预留机加余量、采用真空清洗、优化热处理工艺、加严设备监管等措施,改进了马氏体不锈钢零件表面质量,实现了光亮热处理。     

真空热处理零件表面光亮度与真空度的关系

通过试验并结合不同材料零件的真空热处理生产,总结出TC4合金、DD3合金、DZ22合金和2Cr13不锈钢等材料真空热处理时,使表面光亮所需的最佳真空度范围。     

不锈钢衬底化学镀Ni-W-P三元合金组织及性能研究

采用复合络合剂,在2Cr12不锈钢上直接化学镀Ni-W-P,并对镀层的形貌、成分、组织结构及性能进行了检测和分析。结果表明:不锈钢经过合适的前处理后,得到的镀层光亮、均匀,表面呈胞状组织;在400℃热处理后,开始析出Ni3P相;镀态层的硬度HK值由8186MPa提高至11850MPa;结合力、耐磨性也有明显增强。     

国外不锈钢连续直缝焊管机组的发展

本文对国外不锈钢连续直缝焊管机组的发展状况作了较系统的介绍;综合评述了国外带材连续成型、焊接速度、多电极焊接、内壁气托技术、保护气体的选用、光亮热处理、内外壁焊缝的处理、在线及离线检验设备、机组自动控制及焊缝跟踪装置等工艺技术装备的特点与水平。并摘要介绍钛焊管在不锈钢焊管机组上生产时,所用成型工具与生产工艺上的不同。     

氨分解气氛网带炉的设计与应用

针对不同工艺过程，小型工件对加热设备的要求，着重探讨了小型氨分解气氛网带炉的结构设计与应用。配有氨分解气氛发生装置的小型网带炉可实现小型工件的钎焊、小型粉末冶金件的烧结以及不锈钢材料的光亮热处理；不同的工艺过程对加热炉的结构设计有不同的要求。     

不锈钢抽芯铆钉真空气淬

最近,我所接到上海异型铆钉厂委托的一项热处理任务。对不锈钢抽芯铆钉进行热处理。该铆钉材料为1Cr18Ni9,芯子为2Cr13。热处理后技术要求;2Cr13达到HRC42～45,1Cr 18Ni9HV180。热处理后要求变形小,且铆钉表面光亮,不允许有微量氧化色。这种铆钉是新产品,国外市场上很畅销。该厂原来用箱式炉加热水淬,然后酸洗     

光亮退火处理304不锈钢在NaCl溶液中的耐蚀性

采用稳态阳极极化曲线、恒电位开路衰减响应曲线和电化学噪声等多种电化学测试技术研究了光亮退火处理的304不锈钢在0.01-0.6mol/L NaCl溶液中的耐蚀性能.研究结果表明,不锈钢的点蚀击穿电位Eb值与Cl-浓度的对数呈线性关系,在同一浓度下,光亮不锈钢的Eb值比普通不锈钢大约正400-600mV;在0.6mol/L NaCl溶液中不锈钢恒电位开路衰减及电流噪声的测量结果也表明,光亮退火处理使不锈钢在NaCl溶液中钝化膜的稳定性明显改善,耐点蚀能力显著提高.     

不同热处理态的304和321奥氏体不锈钢在氯化铵环境中的应力腐蚀行为对比研究

目的 对比研究原始、固溶和敏化态的304和321奥氏体不锈钢在模拟加氢催化氯化铵环境中的应力腐蚀（SCC）行为及机理。方法 将304和321奥氏体不锈钢经过热处理制备成固溶和敏化态试样,采用U形弯试样在模拟加氢催化氯化铵环境中浸泡的应力腐蚀试验方法对其进行研究,通过观察U形弯弧顶的腐蚀形貌和开裂时间,并结合腐蚀及裂纹的SEM照片和电化学测试结果进行分析。结果 原始和固溶状态304不锈钢U形弯试样在氯化铵溶液环境中开裂时间为25 d左右,断口形貌分别为穿晶断口和沿晶断口;敏化态试样18 d后发生开裂,断口形貌为穿晶和沿晶的混合断口。原始和固溶态321不锈钢U形弯试样在该环境中经过39 d均无应力腐蚀裂纹;敏化试样经30 d后产生宏观开裂。电化学测试结果显示,不同热处理态的304不锈钢在氯化铵溶液中均具有明显的点蚀敏感性,321不锈钢在该环境中耐点蚀和应力腐蚀的能力优于304不锈钢。结论 不同状态的304不锈钢在高温氯化铵环境中具有较强的应力腐蚀倾向,特别是敏化态试样;321不锈钢在该环境中的应力腐蚀敏感性相对较小,但敏化处理显著增加了其沿晶应力腐蚀倾向,而固溶态试样具有明显的沿晶腐蚀特征。     

双相不锈钢特性及热轧中板生产要点

双相不锈钢兼有奥氏体不锈钢和铁素体不锈钢的优点,即具有优良的力学性能、耐蚀性,以及良好的焊接性而得到迅速发展。本文介绍了双相不锈钢的发展情况,其优良的耐腐蚀性能和力学性能,以及生产中钢板边裂和热处理σ相的控制要点。     

热加工对复合板不锈钢表层晶间腐蚀的影响

对压力容器用低合金钢/不锈钢复合板在热加工后的晶间腐蚀行为进行研究,主要针对三种常用表层不锈钢304,321及316L热加工后的晶间腐蚀特性进行探讨。结果表明:表层不锈钢中,321钢存在少量阶梯组织,接近凹坑组织,过多的热处理工序会引起其晶间腐蚀,但程度上轻于316L钢;304钢为明显的晶间腐蚀类型,受热处理的影响较大,严格控制热加工工艺可使其晶间腐蚀的倾向相对最轻;316L钢热加工过程中的晶间腐蚀倾向最为严重,应尽量减少热处理。合金元素较多的钢种(321和316L)在敏化温度热处理后,晶间腐蚀特征改变不大;低碳不锈钢(304)经热处理后,晶间腐蚀所受影响较大。     

Effects of cooling rate and annealing treatment on sensitization of austenitic-ferritic duplex stainless steel

Duplex stainless steel has higher corrosion resistance and better mechanical properties than conventional type 300 series stainless steel. The corrosion behavior of duplex stainless steel is strongly dependent on the ratio, shape, size and distribution of austenite and ferrite phase in the microstructure. The relationship between the microstructure and the corrosion behavior of the duplex stainless steel was studied. For this purpose, the duplex stainless steel samples were solution heal treated at 1150°C followed by either cooling at various rates (water quenching, air coooling, furnace colling with door opened and door closed) to 820°C and then water quenching to room temperature, or quenching to room temperature and annealing heat treatment at 840°C for various lengths of time. A double loop electrochemical polentiodynamic reactivation (EPR) test was carried out to examine the effect of various cooling procedures or annealing treatment on the sensitization of duplex stainless steel. The grain size, shape, and distribution of the two phases were examined under microscope. From the test results, the relationships were discussed among heat treatment, electrochemical properties and microstructure.     

不锈钢在模具制造中的应用

介绍了奥氏体不锈钢、马氏体不锈钢、沉淀硬化型不锈钢在热作模具、无磁冷作模具和塑料模具中的应用。并简要讲解了几种典型不锈钢的性能、应用及热处理工艺。     

TiC-Maraging stainless steel composite： microstructure, mechanical and wear properties

Particulate TiC reinforced 17-4PH and 465 maraging stainless steel matrix composites were processed by conventional powder metallurgy （P/M）. TiC-maraging stainless steel composites with theoretical density 〉97% were produced using conventional P/M. The microstructure, and mechanical and wear properties of the composites were evaluated. The microstructure of the composites consisted of （core-rim structure） spherical and semi-spherical TiC particles depending on the wettability of the matrix with TiC particles. In TiC-maraging stainless steel composites, 465 stainless steel binder phase showed good wettability with TiC particles. Some microcracks appeared in the composites, indicating the presence of tensile stresses in the composites produced during sintering. The typical properties, hardness, and bend strength were reported for the composites. After heat treatment and aging, an increase in hardness was observed. The increase in hardness was at- tributed to the aging reaction in maraging stainless steel. The specific wear behavior of the composites strongly depends on the content of TiC particles and their interparticle spacing, and on the heat treatment of the maraging stainless steel.     

不锈钢件套裁级进模设计

介绍了冲压不锈钢制件的同时 ,利用该零件的冲裁废料冲压成形另一不锈钢零件的工艺过程 ,并介绍了冲压成形两不锈钢零件的级进模结构及模具凸、凹模间隙的选择、模具材料及热处理工艺。     

Effect of intermetallic compounds on heat resistance of hot roll bonded titanium alloy–stainless steel transition joint

The effect of intermetallic compounds on the heat resistance of transition joint was investigated. The experiment of post-weld heat treatment for the hot roll bonded titanium alloy–stainless steel joint using nickels interlayer was carried out, and the interface microstructure evolution due to heat treatment was presented. There was not found significant interdiffusion at stainless steel/nickel interface, when the specimens were heat treated in the temperature range of 600–800 °C for 10 and 30 min, while micro-cracks occurred at the stainless steel/nickel interface heat treated at 700 °C for 30 min. The thickness of intermetallic layers at nickel/titanium alloy interface increased at 600 °C, and micro-cracks occurred at 700 and 800 °C. The micro-cracks occurred between intermetallic layers or between intermetallic layer and nickel interlayer as well. The tensile strength of the transition joint decreased with the increase of heat treatment temperature or holding time.     

热处理工艺对0Cr16Ni6不锈钢硬度的影响

硬度表征着材料抵抗外界变形的能力,是生产中检验材料性能的重要参数之一。采用不同热处理工艺对Ф60mm 0Cr16Ni6不锈钢棒料进行工艺试验,分析0Cr16Ni6钢的显微组织,研究不同热处理工艺对0Cr16Ni6钢硬度的影响规律,最终使0Cr16Ni6不锈钢硬度值达到了41～43HRC,满足了生产使用要求。     

热处理工艺对2205双相不锈钢耐蚀性能的影响

对2205双相不锈钢采用不同温度进行热处理,然后用光学显微镜和电子扫描电镜观察其在0.33mol/L FeCl3+0.05 mol/L HCl溶液中腐蚀后的形貌;测试其显微硬度的变化、在沸腾的65%的硝酸溶液中浸蚀24 h的腐蚀速率和在25℃的3.5%NaCl溶液中的点蚀电位。研究表明:2205双相不锈钢在750~900℃保温4h有σ相析出,材料的显微硬度增大。同时随着热处理温度的升高,2205双相不锈钢的点蚀电位降低,腐蚀速率增大。