Effective measures to prevent secondary oxidation of molten steel with large diameter seamless pipes

The main cause of corrosion in large diameter welded pipes

Describe the cold treatment cracking of large diameter steel pipe and preventive measures

Large-diameter seamless pipe prices fall back to the market with a wait-and-see attitude

According to the German Business Daily reported in May 11th, June 1st is approaching. In order to avoid the escalation of trade frictions between the United States and Europe, the EU is willing to negotiate with the US side on the "import quota" with the United States, in exchange for permanent exemption status, and the EU will also give up the previously announced tariff retaliation measures. It is reported that the plan is currently in the scope of consideration, but it is not the final plan, the premise is that the limit of "import quota" is enough to be loose enough to cause significant damage to European steel production enterprises. The US side has not yet made a statement. In addition, the proposal is best proposed by the United States, otherwise the agreement will not comply with the WTO rules.

Stainless steel pipe elbow has excellent corrosion resistance, stainless steel surface thin and strong oxide film so that all stainless steel in all water quality has excellent corrosion resistance, even buried also has excellent corrosion resistance. So it is suitable for a variety of water quality, in addition to disinfection and sterilization, do not need to control the water quality, at the same time, there is no corrosion and excessive exudate, to maintain clean water quality, to prevent secondary pollution, can withstand up to 30 meters per second The impact of high water flow.

Galvanized seamless steel pipe galvanized layer and small, only 10-50g / m2, the corrosion resistance of its hot-dip galvanized pipe is poor, hot-dip galvanized pipe. Ordinary galvanized pipe manufacturers use cold galvanized pipe as quasi-cold water and gas pipelines. Galvanized steel cold galvanized layer galvanized, layered zinc layer and the steel matrix. A thin layer of zinc, zinc layer simply attached to the steel substrate. Therefore, its corrosion resistance is poor. In new houses, galvanized steel is prohibited as a cold water supply.

The advantages of straight seam welded pipe compared with seamless steel pipe are as follows:

X-ray Inspection Operate of Wall Thickness SSAW Steel Pipe

Recently, the price of 45# seamless steel pipe has skyrocketed and plummeted. After the violent rise, the market quickly returned to calm. According to industry analysts, the current stock market of 45# seamless steel pipe is still low, and the market is steadily rising. It is worth looking forward to the recent surge in the price of 45# seamless steel pipe. After the violent rise, the market quickly returned to calm. According to industry analysts, the current stock market of 45# seamless steel pipe is still low, and the market is steadily rising.

Q345B seamless steel pipe leads to increased cost of seamless steel pipe industry. The high cost brought by iron ore has always been the thorn of domestic seamless steel pipe enterprises. The loss of domestic seamless steel pipe industry is also often attributed to the cost of raw materials such as iron ore. The engulfing of corporate profits. In the following table, we made a superimposed comparison and found that the Tianjin 16mn seamless steel pipe resources have no adjustment space. The decline in the price from July to the present has already overdrawn the effect of the ex-factory price of the seamless steel pipe factory. From the cost consideration, if the price does not have a bubble in the downside, the price adjustment has been put in place.

High-precision steel pipes In the conventional quenching method, the cold wind speed is not as fast as oil cooling, and is also lower than the isothermal and graded quenching molten salt. Therefore, increasing the pressure in the refrigerating chamber, increasing the flow rate, and applying the molar mass ratio of nitrogen to argon gas and hydrogen are common developments in vacuum absorption technology today. The vacuum carbonization temperature is generally higher than that of conventional gas carbonization. Usually, the penetration and diffusion of 920~1040 °C can be shown in two stages. It can also be used for pulse ventilation, heat preservation and multi-phase dispersion dispersion. The effect is better due to high temperature, especially surface. The clean, active, and vacuum carbonized layer formation rate is faster than conventional gas, liquid, and rapid carbonization. This is a reinforcing material, especially the use of heat treatment to strengthen the material, which is a more important means. Second, the cold deformation enhancement contributes to the uniformity of the metal deformation, because the deformed portion of the precision steel tube is hardened, and the portion where the deformation or deformation is small continues to develop. Third, the cold deformation strength can improve the safety of the member during use, and when the member is overloaded, plastic deformation occurs, thereby preventing the member from suddenly breaking due to strength.

According to the latest market report, the domestic galvanized seamless steel pipe spot steel market is still rising, and the average weekly increase in the most recent week is about 1.35%. The galvanized seamless steel pipe has continued to strengthen since July; the ex-factory price of steel mills has risen and the prices of raw materials have risen steadily; the “environmental storms” in some regions of China have shown signs of substantial advancement, all of which directly contribute to the domestic spot steel market. The role. Only after the steel price rose, the transactions in some markets slipped, and cautious merchants began to cash in, and some of the quotations gradually stabilized.

The Ministry of Commerce website reported on June 15 that the Ministry of Commerce has just issued a "Notice on the review of the investigation and review of the anti-dumping measures against the import of high-temperature pressure-bearing alloy steel seamless steel pipes for the United States and the European Union."

With the recent decline in the price of seamless steel pipes, the disk has already seen the support of cost and high discount. The current rhythm is that the spot decline has increased, but the futures decline has slowed down. The key to how the premium is finally repaired is when the spot will stop falling and the time of inventory accumulation.

Q345B low-alloy seamless steel pipe news report said: the downward pressure on the economy and the optimization of macro-control policies triggered the market's conjecture on the regulation of the property market. This kind of speculation is not in line with the continuous tightening of the current situation of the property market regulation, and is not conducive to the medium- and long-term pursuit of economic transformation and upgrading. At the same time of macro-tuning optimization, insisting on the regulation of the property market is not relaxing, aiming to guide the flow of financial living water to the physical field where more funds are needed for irrigation, to prevent the real estate bubble from being blown up again, and to create a thicker “safety pad” for economic structural transformation.

At the 2nd China Iron and Steel Financial Derivatives International Conference held in Shanghai on June 16th, Wang Mingwei, the director of the medium-term association, said that the futures market provides a market-oriented means for steel enterprise risk management, which can effectively help steel enterprises manage sales price risk and control. Purchasing costs, optimizing inventory management, rationally arranging and adjusting production plans can also help companies reduce costs and increase efficiency, improve profitability and competitiveness, optimize industrial structure and trade forms, and promote transformation and upgrading of the entire industry.

Today, the overall market of Shanghai No. 10 steel pipe market is still good, but the price increase is generally strong. At present, there is still a wait-and-see attitude for the market as a whole, and the current terminal market demand has not yet been released.

Iron ore as raw material end in the third quarter is affected by environmental restrictions on production, demand is limited, but due to sea freight greatly increased and the depreciation of the RMB, its spot price in 500-600 yuan / ton oscillating operation. As of October 11, 61.5% of Australia's PB wet-based duty-bearing vehicle plates in Qingdao Port were priced at 530 yuan / ton and the iron ore index (62%) was $70.05 per ton. Steel mills have high profits.

Always in pipeline systems we met the material with NACE MR0175/ISO 15156 pipe or fittings, so do you really know what is the major differences between NACE carbon pipe and normal carbon steel pipe? And how is the cost for nace material?

Washington: The US International Trade Commission on Thursday said it had determined that American producers were being harmed by imports of certain large-diameter welded steel pipe from China and India, a finding that locks in duties on those products for five years.