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厂家分析介绍镀锌方管热处理的十个要点

发布时间:2019-05-21人气:67
天津方管也将随时保持坚挺走势成交方面有所…方管本周天津方管市场价格波动运行,成交冷清。周内,随着成本端市场方坯、带钢价格小幅震荡调整,同时 考虑到市场整体活跃度不高等因素,本地主流管厂方管价格也窄幅波动运行。市场方面,经销商补货操作依旧谨慎,管厂成交情况有所转淡。据了解,周内本地主流 管厂价格调价情绪不高:一方面考虑到节前方管厂家补…

镀锌方管热处理的十个要点:一、镀锌方管及夹具在热处理前均应清除油污、残盐、油漆等外来物;二、在真空炉中首次使用的夹具,应预先在不低于工件所要求的真空度下进行除气净化处理;三、在热处理过程中易变形工件,应在专用夹具上进行加热。预热的方法有:一次预热为800℃,二次预热为500-550℃和850℃,一次预热升温度速度应限制;

Ten key points for heat treatment of galvanized square tubes are as follows: 1. Before heat treatment, galvanized square tubes and fixtures should remove foreign substances such as oil, residual salt and paint; 2. Fixtures first used in vacuum furnaces should be degassed and purified in advance at the vacuum required by the workpiece; 3. Workpieces easily deformed during heat treatment should be heated on special fixtures. The preheating methods are as follows: primary preheating is 800 C, secondary preheating is 500 - 550 C and 850 C, and the speed of primary preheating should be limited. 四、对于形状复杂或截面有急剧变化以及有效厚度较大的工件,应进行预热;五、有凹槽不通孔的工件、铸件和焊接件以及加工成形的不锈钢工件,一般不宜在盐浴炉中加热;六、镀锌方管加热应有足够的保温时间,可根据工件有效厚度和条件厚度(实际厚度乘以工件形状系数);

4. For workpieces with complex shapes or sharp changes in cross sections and large effective thickness, preheating should be carried out; 5. Workpieces with grooves and no through holes, castings and welds, and stainless steel workpieces processed and formed, generally, should not be heated in a salt bath furnace; 6. Galvanized square tubes should be heated with sufficient holding time, which can be multiplied by the effective thickness and conditional thickness of the workpiece (actual thickness multiplied by workpiece thickness). Shape coefficient;

七、马氏体不锈钢和耐热钢镀锌方管淬火冷至室温后方可进行清洗、深冷处理或回火,焊接和其后的热处理之间的时间间隔不应超过4小时;八、根据镀锌方管要求和表面状况采用碱洗、水溶性清洗剂、氯溶剂喷砂,喷丸等方法进行清理;九、矫正后应在低于原回火温度下进行去应力退火,形状复杂或尺寸要求严格工件,矫正后在回火时用定形夹具结合回火进行矫正;十、当镀锌方管力学性能不合格时,可重复热处理,但重复淬火或固溶次数一般不超过二次。镀锌方管的补充回火不算作重复处理。淬火状态或低温回火后的马氏体不锈钢和耐热钢工件,重复淬火前应进行预热,退火或高温回火。

7. After quenching and cooling to room temperature, galvanized square tubes of martensitic stainless steel and heat-resistant steel can be cleaned, cryogenically treated or tempered. The time interval between welding and subsequent heat treatment should not exceed 4 hours. 8. According to the requirements and surface conditions of galvanized square tubes, alkali washing, water-soluble cleaning agent, chlorine solvent sandblasting, shot blasting and other methods should be used for cleaning. 9. After rectification, the temperature should be lower than the original tempering temperature. Stress-relief annealing is carried out under the degree of stress, and the workpiece with complex shape or strict size is required. After correction, the workpiece is corrected by setting fixture combined with tempering when tempering. 10. When the mechanical properties of galvanized square tubes are not up to standard, heat treatment can be repeated, but the number of repeated quenching or solid solution does not exceed twice. Supplementary tempering of galvanized square tubes is not regarded as repetitive treatment. Martensitic stainless steel and heat-resistant steel workpieces after quenching or low temperature tempering should be preheated, annealed or tempered at high temperature before repeated quenching.

天津方管市场价格以稳为主厂家难以持续减产…方管虽然目前由于短期到货减少和宏观利好的支撑,价格下行暂时得到控制,但目前方管厂家利润尚存,方管厂家难以持续减产,再加上火运受阻也是临时,短期将快速 缓解,宏观利好的作用也会随着时间慢慢稀释。而目前供需矛盾难以缓解,加上年末将至,资金回笼压力增大,方管厂家对于冬储普遍偏向谨慎,市场价格易跌难涨。因 此,预计… 中小型方管厂家需有良好的营销战略方可质变…方管方管市场的高速增长一方面催生了部分厂家的跳跃式发展,另一方面也掩盖了大量中小型厂家管理和营销低效的事实。今天,在竞争日趋激烈的背景下,中小型方管厂家想要破茧成蝶,还需好的营销战略。中小型厂家开始忙转型升级家家忙转型,个个谋升级,这是2014年经济发展的大势与现象。尤其对数量众多、夹缝中谋生存的中小型厂家,…
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