国内方管或依然将弱势运行为主厂家降价意愿…方管今日方管主流企业持稳运行，尽管今日期货市场始终弱势震荡运行，但早盘钢坯价格上涨10元，成本上移，方管厂家降价意愿有限。今日市场出货也 呈两极分化状态，个别厂家早早出清日产，但多数厂家出货很一般。唐山窄带、中宽带主流钢厂降20，今期螺持绿震荡，方管厂家信心不足，方管厂家多出货为主。目前钢 价对…

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.

预计本周中南方管价格或承压下行成交意愿增…方管本周中南地区方管市场价格震荡调整，天津唐山邯郸主要管厂统计：本周(5.9)厂内原料带钢库存36.75万吨；焊管库存8.85万吨；方管库存21万吨；日均成交量4.86万 吨。另兰格网本周钢坯库存调查：据统计9日唐山主要仓库钢坯库存约30.91万吨，较节前(30日)35.35万吨降4.44万吨，降幅12.56%，降 库放缓，但原料价格支撑依然强劲。市… 青岛方管市场价格持稳厂家方面多在消化现货…方管管厂方面：国内主导方管：临沂108*4.5mm出厂普轧4180元-4250元，连轧4390元，57*3.5mm冷拔加300元；聊城中厚 壁4250元-4300元；磐金102-159*4.5mm基价4360元；鑫鹏源273-377系列4350元；元铧219*6mm-4280元，新冶 特钢219*6mm-4200元（除中南），377*10mm-4450元（除中南）。管厂今年普遍提前停工。方管方面：江鑫方管出厂：…