The editorial center of the seamless pipe network in China has learned that steelmaking and iron and steel companies in most regions are currently in a state of loss, and there are many companies that have stopped production and overhaul, and a few companies have begun to produce cast steel to produce steel and iron and steel.Although the price of the steel market fluctuated upwards, the accumulation of steel purchased by steel mills was not high, steel steelmaking transactions were not smooth, and prices rebounded weakly. It is expected that there will be no major fluctuations in the steelmaking market in the short term. Cast iron and steel casting market this week, a strong wait-and-see atmosphere, individual regional transactions have improved.

　　The seamless steel tube No. 45 is made of steel ingots or solid tube billets that are perforated into wool tubes, and then made by hot rolling, cold rolling or cold dialing. The 45 seamless steel pipe is a material in steel, which is a high-quality carbon structure steel. A large number of mold production companies will use it. Do die steel use.

　　20 # seamless steel pipes are low-carbon steel pipes. Carbon steel is generally divided into three types: low-carbon steel, medium-carbon steel and high-carbon steel, of which 45 # steel is medium-carbon steel, below 45 # is low-carbon steel, and above 45 # is high-carbon steel. Steel, seamless steel pipes without special requirements, 20 # seamless steel pipes are generally used.

　　The galvanized square tube is a hollow square steel tube with a square section shape size made of hot or cold rolled galvanized strip steel or galvanized coil for the blank through cold bending processing and then welded by high frequency.; Or a galvanized square moment tube formed by hot dip galvanizing of a cold curved hollow steel pipe that is prepared in advance.

　　The China Seamless Pipe Network Editing Center has learned that the yield point(σ) has a yield phenomenon of metal materials, and the stress when the specimen can not continue to elongate(maintain constant) during stretching is called the yield point. If the force falls, it should be distinguished from the upper and lower yield points.The unit of yield point is N/mm2(MPa).The high stress of the upper yield point(σ su) specimen before the yield force drops; The lower yield point(σ SL) is a small stress in the yield phase when the initial instantaneous effect is not counted.

　　Classification Q345B seamless steel pipe is a kind of steel material, according to the grade can be divided into Q345A, Q345B, Q345C, Q345E. What they represent is mainly the difference in the temperature of the impact.Q345, is not impact, Q345B level, is 20 degrees room temperature impact, Q345C level, is 0 degrees impact, Q345D level, is -20 degrees impact, Q345E level, is -40 degrees impact.　　

　　It has the characteristics of good mechanical properties, weldability, cold, thermal processing performance and corrosion resistance, and good low temperature toughness.Applied to ships, boilers, pressure vessels, oil tanks, bridges, power station equipment, lifting and transportation machinery and other welding structures with higher load.Q345, is not impact, Q345B level, is 20 degrees room temperature impact, Q345C level, is 0 degrees impact, Q345D level, is -20 degrees impact, Q345E level, is -40 degrees impact.Q345E seamless tube profile, Q345E seamless tube specification 8-1240 × 1-200mm.The Q345E seamless tube is a steel Q345E seamless tube analytical Q345E seamless tube.The main characteristics of the Q345E seamless tube are good mechanical properties, and the weldability belongs to the low Jindu steel plate, which has low temperature impact performance; The steel brand consists of three parts: the Chinese Pinyin letter representing the yield strength, the yield strength value, and the quality grade symbol.Where Q represents the yield strength; 345 represents the yield strength value in units MPa; E represents the level(through the -40 degree impact test).

　　China Seamless Pipe Network Editing Center has learned: 3pe consultation on seamless steel pipes-wide pipeline outer wall anticorrosion coating, data types and operating conditions of pipeline outer wall coating, inner wall anticorrosion coating to prevent corrosion in the tube, ring ratio to reduce friction resistance forward transport The film coated on the inner wall of the pipe, The anticorrosive insulation coating is a composite layer with a heat transfer oil or fuel of medium and small diameter. In order to avoid heat dissipation from the pipeline to the soil, a heat preservation and preservation layer is added to the outside of the pipeline.If the extubation is a polyethylene tube, there is no need to lose in the embalming.For polyethylene has excellent low temperature resistance function, good chemical stability.From September 2015 to January 2016, another 1.78 trillion yuan of investment was approved for infrastructure projects, which is at the peak of another round of project approval.Spraying polyurea anticorrosion construction is a new type of non-solvent and pollution-free green construction technology developed in recent years.The composition, performance index, quality control and application of polyurea antiseptic layer were discussed in detail.Spraying polyurea coating requires special coating equipment, which has extremely strict requirements for ambient temperature, material setting temperature, and conveying pressure.Through proper quality control and reasonable construction, polyurea materials can greatly improve the corrosion protection effect and service life of metals.The application example shows that spraying polyurea antiseptic coating technology is a kind of construction technology with superior performance and wide application, and its application prospects are very broad.Construction technology 1. Before the cleaning and leveling construction, the application of cleaning tools will find the leveling layer to clean up, thoroughly remove cement ash, grease and other foreign matter on the cement surface.Concrete foam, demoulding agent and curing agent on concrete surface must be removed by steel brush, chisel hammer, sandblasting and other methods.It has now been widely used in construction facilities in small and medium-sized construction sites, reducing the amount of civil masonry and concrete by 90 %, under the premise of meeting the intensity of use.Petroleum General 3pe anti-corrosion steel pipe grid, this product in 2009 acquired the country's major domestic cities25mm third-grade spiral steel average price of 3051 yuan(ton price, the same below), an increase of 28 yuan from tomorrow; The average price of the 6.5-mm high line in the key rural areas in China was 3,149 yuan, an increase of 31 yuan from the previous day; The average price of 5.5 mm hot-rolled rolls in key rural areas in China was 3,393 yuan, an increase of 92 yuan from the previous day; The average price of 1.0 mm cold plates in key central townships in China was 4316 yuan, an increase of 55 yuan from the previous day; The average price of the mid-board of 20mm in key cities and towns in China was 3,187 yuan, which was 56 yuan higher than tomorrow. The fluid of the same flow was transported with smaller caliber pipes. Most of the coats were plastic or glass steel, reducing the amount of earthwork excavation by more than half. The product is a two-component, high-solid coating with epoxy resin as the main agent.