For the next week's market, remind everyone to pay attention to the following aspects: 
First, the demand factor. According to the data of the Xiben Shinkansen trading platform, although the high temperature weather has obviously eased this week, the demand for terminal demand in Shanghai continues to decline, factors such as the reduction of iron ore and billet prices and the fall of steel futures have aggravated the market's wait-and-see mood. In the process of rising prices in the early period, the site has generally increased the inventory replenishment. The market demand has been overdrawn to a certain extent. At the same time, the price decline has also reduced the enthusiasm of the site replenishment. The terminal demand for steel pipes will still be difficult to improve next week. 
Second, the supply factor. In the first ten days of August, the daily average crude steel output of domestic crude steel rebounded significantly. In particular, the daily average output of crude steel of key enterprises rebounded sharply by 5.5%, setting a new high level in history, reflecting that the current impulse increase of steel mills is still quite strong. Although Hebei Province will reduce its steel production capacity by 60 million tons in 2017 and the reduction of 26 million tons in 2020, it will give the market a certain embarrassment. However, it is only a long-term plan. The short-term countries have no more in environmental protection. Strict policies were introduced, and in the case of increased production enthusiasm of steel mills, the supply pressure of Tianjin Steel Pipe Plant will gradually increase in the later period. 
Third, the cost factor. Since the second half of last week, the prices of imported iron ore and billet have fallen back, reflecting that steel mills have apparently resisted the price of more than $140/ton, and their purchasing intentions have generally weakened. It is understood that the import and export freight rates in the third quarter will increase by about 15 million tons in the second quarter, and will increase by about 30 million tons in the fourth quarter compared with the third quarter. The iron ore shipping volume will increase by 120 million tons in the next year. The supply of steel pipe plants is not in short supply. Considering that the recent increase in the price of minerals is far greater than the increase in steel prices, and the stocks of raw materials in the steel mills have generally increased after the continuous replenishment in the early stage, the short-term imported mineral prices will face further downward pressure, and the domestic steel price support will also weaken. . 
Fourth, the funding factor. Recently, the central bank's open market operations have been generally stable and tight, and domestic market capital interest rates have continued to rise since mid-August. However, due to the impact of the US exit from QE, the recent signs of hot money outflows are obvious. China’s new foreign exchange holdings have decreased for two consecutive months.

Proceso de producción de tubos de acero en espiral: Es un tubo de acero con costura en espiral soldado mediante soldadura automática de arco sumergido de doble cara de doble alambre con bobinas de acero en tiras como materia prima, a menudo extruidas y formadas.
Festival
Las características de la tubería de acero en espiral: el proceso de producción de tubería soldada con costura recta es simple, de alta eficiencia de producción, bajo costo y rápido desarrollo. La resistencia de los tubos soldados en espiral es generalmente más alta que la de los tubos soldados con costura recta. Se puede usar una pieza en bruto más estrecha para producir tubos soldados con diámetros de tubería más grandes, y un tocho con el mismo ancho también se puede usar para producir tubos soldados con diferentes diámetros de tubería. Sin embargo, en comparación con la tubería de costura recta de la misma longitud, la longitud de la soldadura aumenta en un 30-100% y la velocidad de producción es menor. Por lo tanto, la mayoría de los tubos soldados de diámetro más pequeño adoptan soldadura de costura recta, y los tubos soldados de gran diámetro adoptan principalmente soldadura en espiral.
Tubería en espiral y su clasificación estándar: la tubería de acero soldada por arco sumergido con costura espiral para el transporte de fluidos a presión (SY5036-83) se utiliza principalmente para tuberías que transportan petróleo y gas natural; tubería de acero soldada por alta frecuencia con costura en espiral para el transporte de fluidos a presión (SY5038-83), Tubería de acero soldada de alta frecuencia con costura en espiral soldada mediante un método de soldadura por solapamiento de alta frecuencia para transportar fluido a presión. La tubería de acero tiene una gran capacidad de carga de presión y buena plasticidad, lo que es conveniente para la soldadura y el procesamiento. Generalmente, la tubería de acero soldada por arco sumergido con costura en espiral (SY5037-83) para el transporte de fluidos a baja presión se fabrica mediante soldadura automática por arco sumergido de doble cara o soldadura por una sola cara para agua. Tubería de acero soldada por arco sumergido para transportar fluidos generales de baja presión como gas, aire y vapor
Material del tubo en espiral: Q235A, Q23b, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb. Q345 L245 L290 X42 X46 X70 X80