Standard Specification for ASTM A795 for black and hot dip galvanized (Galvanized) and seamless steel tubes for fire protection

The circular steel tube is a hollow concentric circular section steel tube with both ends open, and its length is relatively larger than its circumference. It can be used in pipes, thermal equipment, machinery industry, petroleum geology drilling, containers, chemical industry and special applications.

1, water supply and drainage Building water supply system can be divided into living water supply system, production water supply system and fire water supply system according to its application. These three kinds of water supply systems are not necessarily separately set up, usually two or three kinds of water supply systems. The building drainage system collects water used by buildings in daily life and industrial production, and drains them out in time. According to the nature of sewage discharged from the system, the internal drainage of buildings can be divided into domestic sewage, domestic sewage, industrial waste water and roofing. Rainwater, sewage (wastewater), industrial waste water and rainwater are set to discharge pipes, known as diversion systems; two or more types of combinations in a pipeline are called combined flow systems; the requirements for different forms according to the water quality conditions and locations are determined after technical and economic comparisons.

German President Merkel expressed disappointment at the decision of President Trump 10 to withdraw its decision to endorse the joint communique of the group of seven Summit (G7) summit. Merkel also said that the EU would take counteraction measures to impose tariffs on steel and aluminum in the United States.

Industrial pipeline is an industrial pipeline. Industrial pipelines can be further subdivided into process pipelines and power pipelines. In general, the flow pipeline refers to the pipeline that directly conveyed the main material (medium) of the product, also called the material pipe, and the power pipeline refers to the pipeline that conveyed the power medium for the production equipment such as steam pipe, air pressure pipe, nitrogen pipe, cyclopentane and other production equipment. Paraffin pipes, oxygen pipes, etc. Power lines affect the normal operation of production.

Resistance welding is to clamp the workpiece between two electrodes and apply a current. The current is heated to a molten or plastic state through a resistance heating effect flowing through the contact surface of the workpiece and the current in the adjacent region to form a metal. A combination of methods. The welded pipe made of resistance welding is called the resistance welded pipe (ERW pipe).

The non-uniform deformation of the seamless tube forming and welding reduces the residual stress caused by the forming and welding of the tube, improves its distribution and improves the overall mechanical properties of the steel pipe. These changes should be fully taken into consideration when developing seamless steel tubes. The width, length and thickness of the pipe sheet should be taken into account, and the outer diameter of the steel pipe before expansion should be considered, so that the geometric size of the steel tube after the diameter expansion can not reach the final requirement. For different grids, the cold expansion path also has the effect of improving the straightness of seamless pipes, especially the straight-line effect of small diameter seamless steel tubes is more obvious.

Seamless steel pipe is more boring and stricter in the production process. Seamless steel pipe is one of the most important steel pipes. It is necessary to carry out repeated tests in the process of production, to develop and produce, to make the performance of the pipe and the use of seamless steel pipe, and to make the best use of its various applications and to make use of engineering and processing. The seamless steel pipe in the development and production process is to carry out some tests, here is mainly to explain the flatting test, is a seamless steel tube factory physical and chemical workroom for seamless steel pipe research, a more important test. What are the common methods and steps for testing?

Cold drawn steel is a common machine material. Ordinary cold drawn steel, cold drawn round steel, cold drawn flat steel, cold drawn six angle rod and so on, are usually stainless steel, carbon steel, free cutting steel, bearing steel. Cold drawn steel processing has the characteristics of high dimensional accuracy and smooth surface. In actual production, this advantage is only suitable for hot rolled materials compared with other bright materials such as peeling or polishing materials, because the surface cracks appear to be more likely to be at a disadvantage. Cold drawn steel bars are usually shallow, and throwing 20 to 50 can be eliminated. It is a slight crack.

1. composition: stainless steel welded pipe is made of nickel chromium steel, carbon steel and iron, and has nickel, chromium, manganese, copper and other elements. The ASTM A53 pipeline, also known as the ASTM A53 pipeline, is used for mechanical and pressure applications, and also for general purposes of steam, water, gas and air pipelines.

In the morning of 29 Beijing, the Canadian International Trade Tribunal said on Monday that it had launched a preliminary antidumping investigation of steel imported from China, South Korea and Vietnam. The court will investigate the dumping and subsidies of cold rolled carbon steel products imported from these three countries, which has caused damage to the Canadian steel industry. The Canadian International Trade Tribunal operates under the Canadian trade remedy system and reports to Parliament. The court said it would confirm the findings in July 24th.

In April, the total amount of steel imported from steel enterprises in the United States was 3 million 390 thousand tons, with an increase of 12.2% and 11.6% over the same period. However, according to market participants, the trend of import growth is expected to be suppressed in the third quarter of this year.

The components of the pressure pipe are generally standard parts, such as the ASTM A53 pipe or the ASTM A106 pipe, so the design of the pressure pipe components is mainly used for the selection of the standard parts. The pressure grade of the pipe is determined by the level of the standard parts. The company is located in:

The low carbon steel tube with ceramic is composed of ceramic and metal composite pipes. Ceramic tube combines high hardness, good chemical inertness and steel advantages. It has excellent wear resistance, corrosion resistance, heat resistance and thermal shock resistance. Power plant coal powder, ash, slag, tailings, backfilling, coal, concentrator, coke plant coke particles, the sintering plant material transport life is 15 times higher than the ordinary steel pipe resistance to mechanical impact performance, can also be used for liquid aluminum, corrosive medium transport.

Schedule 40 "and" schedule 80 "refer to the reference charts issued by the American National Standards Association (ANSI).

The tubing connector is 6.10 meters shorter than the tubing length in API 5CT. Executive Standard: API 5CT, API 5B Specifications: 1.9"-4-1/2" Button type: Eu, Nu,p Steel Grade: J55, K55, N80, L80, P110 Length: 2FT-20FT Uses: for wellhead length adjustment

The tubing connector is 6.10 meters shorter than the tubing length in API 5CT. Executive Standard: API 5CT, API 5B Specifications: 1.9"-4-1/2" Button type: Eu, Nu,p Steel Grade: J55, K55, N80, L80, P110 Length: 2FT-20FT Uses: for wellhead length adjustment

After getting approval from the National Company Law Tribunal (NCLT) in India on Tuesday, the India Steel Corp (Tata Steel) will open a takeover process for the bankrupt Steel Corp (Bhushan Steel). The industry expects that the India flat material industry will be further integrated. In the iron and steel industry in India, 6 companies account for 85% of the flat material production capacity. They are Tata Steel, JSW Steel, Steel Authority of India, Pu Shao steel, Bhushan Power and Steel Corp (Essar Steel). The last three companies are going through bankruptcy proceedings according to the new bankruptcy law of India.

The new production line of martensitic stainless steel seamless tube KL-HP12CR has excellent weldability, mechanical properties and corrosion resistance. Its weldability is improved by reducing its carbon and nitrogen content. Reducing carbon content also significantly increased the resistance to carbon dioxide corrosion. The corrosion rate was less than 0.127mm / A in a carbon dioxide environment at temperatures up to 160 degrees Celsius. And 2.0MPa. Sulfide stress cracking (SSC) is due to the addition of molybdenum. The new seamless pipe can be used in the hydrogen sulfide environment of pH 4 and 0.001 MPa. The strength of the pipe is X80 grade, and it has enough low temperature toughness when used in pipeline. After heat treatment for a few minutes, the carbon content is reduced. Adding titanium can effectively prevent intergranular stress corrosion cracking (IGSCC) in the heat affected zone. The pipeline is expected to be further used to deliver liquid containing corrosive gases, such as carbon dioxide, which is a cost-effective, high life, and low cost material.

In recent years, international research and Analysis on the research, development and application of X80 grade large caliber high grade steel pipe conveying seamless pipe steel for natural gas are studied and analyzed. The main results are as follows:

First, technical requirements 1, specification: 323.9mm * 11.125mm * 10000-12000mm seamless pipe 2, applicable standards and levels: API Spec 5L PLS1. 3, steel number: X52, smelting analysis and product analysis conform to API Spec 5L. 4, the slab quality should meet the requirements of YB / T4149-2006 standard for continuous casting slab. 5, the tensile properties of steel should be in accordance with API Spec 5L. 6, the deviation of the pipe size should be in accordance with the provisions of the table below. Dimensional process external diameter tolerance Wall thickness deviation