The corrosion resistances of enamel-coated steel pipe in 3.5 wt% NaCl solution was evaluated and compared with those of epoxy-coated pipe using open-circuit potential, linear po- larization resistance, and electrochemical impedance spectros- copy tests.

Stainless steel welded pipe needs to be protected by nitrogen when welding. What is the principle of nitrogen-protected stainless steel welded pipe ?

  Heat treatment (or heat treatment) is a group of industrial and metal processing processes used to alter the physical properties of materials, sometimes chemical properties. Heat treatment of steel can be defined as the application of heat to change the properties or state of the steel. The heat can be measured by the temperature of the steel to be treated. The temperature can be cold or hot when touched, so the process temperature range can range from very cold to very hot. Alternatively, in terms of temperature, the range can be from cold negative temperature to hot addition temperature.

The difference between the so-called stainless steel seamless steel pipe and the carbon steel seamless steel pipe mainly refers to the difference in design rules between stainless steel and carbon steel, that is to say, the design rules of the two steels are not universal. The differences between 27simn seamless tubes are summarized as follows:

　　On November 7, the China Iron and Steel Association said that in October, affected by the country's steady growth policy measures, the market is expected to rise, and the release of steel production capacity remains at a high level, driving demand for iron ore and rising prices. The post-market will soon enter the low season of Q345C seamless steel pipe consumption, steel output will decrease, iron ore demand intensity will decline, and prices will not continue to rise, will be slightly fluctuating.

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.

According to the German Business Daily reported in May 11th, June 1st is approaching.

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

In the exploration and development of petroleum companies, the processing quality of oil casing threads is directly related to the exploration and development benefits. This is mainly because the thread is the joint part, so it is the weakest link, so it is often the area with high accidents. In the process of oil casing thread processing, there are often quality defects of one kind or another. Based on this background, this paper analyzes the quality defects of oil casing thread processing in combination with its own working practice, and puts forward some points of view on strengthening the thread processing of oil casing.

Method of operation: After heating the steel to Ac3+30~50 degrees or Ac1+30~50 degrees or below Ac1 (you can refer to the relevant information), it will generally cool slowly with the furnace temperature.

Mainly used for general engineering structures and mechanical structures. Its representative material (brand): carbon steel 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo and so on.

　　This week, the domestic seamless steel pipe market of No. 45 showed a steady upward trend.

After the stainless steel tube cold billet is heated, there is generally a temperature difference between the radial direction and the axial direction.

What is the type of line pipe tempering? According to the performance requirements of pipeline steel pipes, depending on the tempering temperature, tempering can be divided into the following types:

1. Introduction to seamless steel pipe The seamless steel pipe is a circular, square, rectangular steel with a hollow section and no seams around it. The seamless steel pipe is formed by perforating a steel ingot or a solid tube blank, and then hot rolled, cold rolled or cold drawn. The seamless steel pipe has a hollow section and is used as a pipe for conveying fluid. Compared with a solid steel such as round steel, the steel pipe has a lighter weight when it has the same bending and torsional strength, and is an economical section steel which is widely used for manufacturing structures. Parts and mechanical parts, such as steel scaffolding for oil drills.

An ISO 9001:2008 certified company, Victor Steel supplies a wide range of ASTM A312 TP 316L Stainless Steel Seamless Pipe to customers across world.Our focus is on providing customers with high end steels that are not rolled or stocked locally.

The invention provides a protective coating for oil pipes and wellheads and downhole equipment used in oil and gas drilling, oil recovery and transportation.

High-quality resources are tight and the price is high. Some mines have increased mine use, mine sales are better, traders are more active, and small and medium-sized mines are starting to improve slightly.

Q345 channel steel price market traditional sales season, and because of the "golden nine" market failure, the market will habitually think that the delay of the peak season, may eventually fall to October, so before the National Day, the market for " The Silver Ten” peak season still has high expectations, and after the steel price has been consolidated for more than a month, there are conditions for a rebound.

The steel market continued its rebound last week. In addition to the weak and weak market, other major varieties of construction steel continued to rise.

A105 is the American ASTM standard number, and A stands for ordinary carbon structural steel.