At present, there are more than 2,000 welded steel pipe companies in China, and the top 11 major welded steel pipe companies have a combined production capacity of more than 12.15 million tons, accounting for about 1/5 of the country's total welded steel pipe production capacity, and the industry concentration is low. In recent years, the technical level of my country's welded steel pipe production equipment has been further improved. At present, the production units that account for more than 50% of my country's annual output of welded steel pipes are of the international advanced level, and some have reached the international leading level. The quality of welded steel pipe products has also been further improved, which has basically been able to meet domestic demand. In terms of the specific competition pattern, the domestic welded steel pipe industry has formed a competition pattern in which state-owned enterprises in the petroleum and petrochemical.

Precision steel tube is a high-precision seamless steel tube material processed by cold drawing or hot rolling. Because the inner and outer walls of precision steel pipes have no oxide layer, high pressure without leakage, high precision, high smoothness, cold bending without deformation, flaring, f

Large seamless steel pipe Seamless steel pipes with small outer diameters can be copied as small-diameter seamless steel pipes. Small-diameter seamless steel pipes can also be divided into: seamless small-diameter steel pipes and straight seams (also known as welding). Seam steel pipes are generally

The difference between precision seamless steel pipe and seamless steel pipe1 The main feature of the seamless steel pipe ready after oil is that it has no welded seam and can withstand greater pressure than the version. The product can be a rough cast or cold drawn part.2. Precision seamless steel

What is a loose flange, where is the loose flange used and what pipe fittings? The loose flange is the movable flange piece, which is generally matched with the water supply and drainage fittings (the most common on the expansion joint). When the factory leaves the factory, there is a flange at e

For square tubes, everyone is familiar. In our lives, we can see them in many places, especially in industry and construction. However, some square tubes have a short service life. In fact, this It is inseparable from the daily maintenance and maintenance. In order to extend the service life of the

Standard classification of stainless steel flanges Specification: 1/2 "～80" (DN10-DN5000) Pressure rating: 0.25Mpa ～250Mpa (150Lb ～2500Lb) Commonly used standards: National standard: GB9112-88 (GB9113·1-88～GB9123·36-88)

They have long been used to seeing the tepid market in the elbow industry this year. So we started to clear our inventory very early and withdraw funds. In order to maintain normal operation, only some commonly used specifications are stored. More time to choose the form of factory direct sales. The

The first is to improve the cleanliness of the molten steel of the straight seam steel pipe and reduce harmful inclusions; increase the proportion of equiaxed crystals in the continuous casting slab to reduce center segregation and center porosity;

In October 2011, the U.S. Department of the Treasury initiated an investigation into the countervailing case in accordance with the regulations of the British Steel Works, V&MStar, TMKIPSCO and the British Steel Workers Council. At that time, senior officials of the Ministry of Commerce of the People's Republic of China stated that they blindly followed the trend to accuse my country of countervailing or subsidies for imported goods, which lacked objective factual basis, and my country decisively resisted this matter.