上海方管价格持稳运行厂家多已出货为主方管上海方管价格持稳运行，市场方面，今本地市价主流稳中偏弱运行，目前方管市场需求整体一般，成交相对偏弱。由于当前南北热轧方管库存均偏低，五月以来下游需求有萎缩迹象，方管厂家多已出货为主。不过库存资源相对不多，商家出货压力不大，市场价格比较稳健。目前市场供需处于平衡，方管厂家多持观望态度。考…

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.

上海方管市场窄幅震荡运行为主无持续上涨可…方管上海方管市场价格涨50元。市场方面：上周上海市场方管触底反弹，本周开头方管厂家补涨上周上涨行情。目前方管厂家对于后市看法仍不看好，主要是受近期需求持续较差影响，即使原料 端缺货，但是一旦原料资源充足，方管厂家又会担心价格大跌，再加之管厂对代理商的优惠政策持续，预计短期内上海方管市场窄幅震荡运行为主，暂无… 长沙镀锌方管价格或将稳中趋强厂家悲观的心…方管长沙镀锌方管价格：现湘钢300线3950/元/吨，薄壁方管4070元/吨、大螺3850元/吨；冷钢涟钢薄壁方管4070元/吨、大螺3850元/吨；萍钢Φ8-10盘螺4050元/吨。今日期螺震荡上行，尾盘收涨32元/吨。现货价格方面，上午长沙镀锌方管市场价格基本稳定，下午随着期螺的冲高，部分方管厂家价格上调10-20元/吨。成交方面，终端需求释放疲…