Knowledge of Huanggang small diameter thick wall alloy steel pipe
Measures to improve the accuracy of steel pipe wall thickness
The control of steel pipe wall thickness is a difficulty in steel pipe production. The measures to improve the accuracy of wall thickness in production mainly include the following aspects:
1. Tube billet heating
Heating should be uniform, rapid temperature rise and fall is prohibited. The maximum temperature rise and fall should not exceed 30 ℃.
2. Centering roller
Determine whether the centering roller is installed in place, adjust the center, opening angle and opening size of each action of the relevant core holding roller, and the center of the core holding roll shall be on the rolling line.
3. Rolling center line
Make sure that the rolling center line of the piercer is consistent with the center line of the piercing car, avoid "up rolling" or "down rolling", so as to keep the tube blank under uniform stress during piercing.
4. Rolling tools
The worn plug, guide plate, roll and other rolling tools should be replaced in time.
5. Rolling tool installation
The center of roll distance and lead distance must be on the rolling line. Ensure that the center line of lead and roll distance is on the center line of piercing rolling, i.e. the upper and lower roll spacing is equal, and the left and right lead distances are equal.
Huanggang small diameter thick wall alloy steel pipe news
It is expected that the billet market will show a small fluctuation trend this week. With the digestion of inventory, it is expected to have a shock upward market at the end of June. The domestic scrap steel market is weak and declining, and the range has increased, and the transaction is not ideal. In recent years, the trend of futures and electronic disk is not good, the market of finished products is weak, and the situation of alloy tube is declining. Under this situation, the domestic scrap steel market is still weak. Under the influence of continuous reduction of steel scrap purchase price by steel mills, domestic scrap market quotation also fell continuously, with a drop of 20-120 yuan. Compared with the earlier stage, the mentality of the manufacturer is obviously pessimistic, and the enthusiasm is frustrated. The operation method is still fast in and fast out. It is expected that the domestic scrap market will continue to explore the bottom in the near future.
Last week, the East China steel billet market was stable, and the transaction of alloy tube was light. It is understood that although it is out of the first month, there is no improvement in steel billet demand in Shandong. Moreover, most manufacturers have already finished their orders before the Spring Festival, but the recent shortage of new orders has led to the reduction of manufacturers' shipment.
Some iron mills in some areas were shut down by the government due to environmental pollution, resulting in the reduction of spot resources in the market. However, due to the same weak demand, it did not have a great impact on the iron price. Most iron mills still said that the price increase was weak. The alloy tube market is still difficult to improve, and the price is likely to continue to fall. Affected by the high import ore market and the limited available resources of fine ores, the iron ore prices in Tangshan and other areas have risen slightly, and the shipment situation of ore dressing enterprises is acceptable, but the price is still lower than the production line of ore dressing plants, and the enthusiasm of manufacturers to supply goods is not high. The market in Northeast China tends to rise steadily
Brief introduction of Huanggang small diameter thick wall alloy steel pipe
Due to the long construction period, complex construction process and construction technology of alloy steel pipe project. Therefore, there is a wide range of construction equipment and installation risks. Project risk refers to the implementation stage of construction project including design, construction and transfer operation. It is possible that there are differences between the actual results of construction project investment, schedule, safety and quality and subjective expectation. And this difference makes the relevant parties suffer losses. In the alloy steel pipe engineering risk.
The cause of risk situation is called engineering risk source. According to different engineering risk sources, construction and installation engineering risk is divided into natural risk and human caused risk. In the actual project construction I, there are many engineering risks caused by human factors. For example: the third party casualties caused by accidental injury of construction workers or falling objects in construction workers; loss or damage of alloy steel pipe materials and equipment; unqualified engineering quality due to design problems of designers or failure of contractors to construct according to design requirements of designers.