南京镀锌方管市场价格将暂稳观望运行出货情…方管南京镀锌方管市场价格暂稳。今日上游方坯价格小幅上涨，带钢价格下跌，管厂出厂价格普稳个调。目前南京地区镀锌方管市场价格暂未调整，出货情况一般。据当地钢贸商反映，近期市 场需求仍处于偏弱状态，超载严查导致运费小幅上涨，重点影响到找车，个别仓库出现额外“门票”费用。方管厂家对后市依然保持观望情…

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.

国内方管价格或有进一步回落厂家出货情况不…方管方管市场价格稳中松动，广州、杭州个别地区小跌20元。今日期货低开高走，现货方管价格普遍维稳为主，出货情况一般。据悉，当前国内方管市场库存151.26万吨，周环比降2.90%，其中乐从库存 24.50万吨，社库仍属于历史低位，方管抗性仍存。不过值得一提的是，目前方管均价已经超过螺纹，河钢，包钢等钢厂铁水也呈现逐步回流方管… 6月8日上海镀锌方管市场价格暂稳厂家多持观…方管上海镀锌方管市场价格暂稳。目前整体方管市场处于需求淡季，加上近期上游原材料市场持续下跌，方管厂家价格整体趋弱，方管厂家对后期市场行情并不看好，多持观望态度，操作较为谨慎。库存方面持续进出平衡水平运行。综上所述，预计短期内上海镀锌方管市场将以震荡偏弱运行为主。原料方面，今日唐山瑞丰355mm系列带钢报价3760…