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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:126
广州方管市场价格趋弱调整厂家多数已经停产…方管广州方管市场价格趋弱调整。市场方面,今日市场趋弱调整,幅度10-30元,较昨日稍缓。据了解,之前有企业提前复工被查处,因此现在没有人再敢提前开工。多在家办公。华南方管厂家多数已经停产检修,预计复工时间为2.10;下游方面,政府下令全面停工至十号;物流方面,车辆停止运输,钢铁大世界无车辆来往;库存…

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.

近期沈阳市场方管价格或弱稳运行厂家开始办…方管沈阳市场方管价格平稳,市场尚未开动。今日期螺保持震荡走高的态势,最终收于3427,今日沈阳当地现货市场维持稳定,目前东北地区几乎 全员停摆,下游现货需求近乎为零。加之非常时期,疫情导致市场冷淡停顿,本周方管厂家开始办公,但绝大部分都是远程进行工作。不过成交方面惨淡,难有出货。 而工地方面则早已完全停工。库存… 杭州镀锌方管价格近期将弱稳运行厂家以出货…方管杭州镀锌方管市场价格暂稳,今日管坯价格坚挺,管厂整体价格暂稳,现临沂地区108*4.5mm镀锌方管出厂价格:金正阳4250元、金宝诚4230元、瑞钢联4200元、泰宗 4200元、美鑫4180元。市场近日成交较为清淡,据本地镀锌方管厂家反馈,十月整体出货较为清淡,方管厂家利润空间太薄,整体盈利能力一般,以出货为主, 库存量维持常备…
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