Nansteel Manufacturing Co.,Ltd

  Low-temperature seamless steel pipes are mainly used in the production of ethylene, propylene, urea, synthetic ammonia, compound fertilizers, and other process equipment such as washing, purification, desulfurization, and degreasing in the pharmaceutical industry, as well as cryogenic equipment manufacturing, ultra-low temperature cold storage, and ultra-low temperature liquefaction. Gas pipelines and their pipe components, such as petroleum gas cryogenic separation equipment, air separation equipment, etc. There are two main types of low-temperature seamless steel pipe materials: austenitic and ferrite. The difference in crystal structure determines that the austenitic cryogenic pipe has no brittle transition temperature in the low temperature range. Generally, it is not necessary to verify its low-temperature impact toughness. It is used, but GB150-2011 stipulates that when the operating temperature is not lower than -196 ℃ (low temperature range), the impact test can be exemp...

  Coal-to-electricity conversion refers to the conversion of coal-fueled boilers and other tools used for heating to electric heating. Under current environmental protection requirements, it can only be changed to clean energy. Coal-to-clean energy accounts for about 80% of the share , It is widely used because of fast electric transmission and fast heating. The heat transfer from coal to electricity is still hot water, so hot water is still used to transport hot water. Insulating steel pipes still play an irreplaceable role in other conveying products in the coal-to-electricity conversion, because the heat loss of insulated steel pipes is very small when transporting the medium. In addition, the insulation steel pipe has a long service life, low cost, high social benefit, and simple construction. The insulation steel pipe also has an alarm line. Once there is water leakage, it will immediately report to the police to deal with hidden dangers in time. The superior performance of th...

 Heat treatment is a seamless steel pipe thermal processing technology that heats, heats, and cools seamless steel pipe in a certain medium, and controls its performance by changing the surface or internal crystalline structure of the material. In addition to annealing and tempering, there are three types of normal heat treatment processes: 1. Normalization Normalization processing, also called normalization processing. The normalizing treatment in the heat treatment process of seamless steel pipes is actually normalizing treatment. Usually in the hot working process, the structure of the seamless steel pipe material changes, and the performance also changes accordingly. In order to restore the structure to normal, normalizing treatment is often used, so normalizing treatment is also called normalization treatment. Normalization treatment can be used as a final heat treatment, or as a pre-heat treatment, and can also improve processing performance. In general, carbon steel normaliz...

  Polyurethane insulation steel pipe is a kind of insulation steel pipe product widely used at low pressure, mainly suitable for transporting hot and cold water, etc. However, the insulation effect of polyurethane insulation steel pipe directly depends on the effect of the polyurethane insulation layer.   The thermal insulation material used in polyurethane thermal insulation steel pipe is polyurethane foam. The following are the characteristics:   A. Low density and low thermal conductivity. Under normal conditions, the density of rigid polyurethane foam board is 35-40 kg/m3. But compared with other thermal insulation materials, rigid polyurethane foam has very good thermal insulation properties, that is to say, if it reaches the same thermal insulation performance, rigid polyurethane foam board is thinner than other materials. At the same time, the application of rigid polyurethane foam saves space.   B. Wide application temperature can be used normally between -40...

  The process of 16 Mn   seamless steel pipes from production to use is continuously tested repeatedly. Without a good test process, it is impossible to produce a more qualified product. 16 Mn  seamless steel pipes can only be effective when they are repeatedly tested during production. In general, manufacturers have to continuously test repeatedly during production. The common test methods and What are the steps? We are here to introduce the steps and methods of related experiments:   During the flattening test of 16 Mn  seamless steel pipe, if a sample of a rolled-length pipe or segmented pipe fails, a sample should be taken from the same end of the original 16 Mn  seamless steel pipe for retest. If it is qualified, the 16 Mn  seamless steel pipe shall be rejected, and another 20 Mn  seamless steel pipe shall be taken from the batch, and one end shall be sampled for re-inspection. If one of them still fails, the batch of 16 Mn  seamless st...

  Steps of carbon and sulfur analyzer to analyze chemical composition of seamless steel pipe   The carbon-sulfur analyzer analyzes the chemical composition of seamless steel pipes. The principle is that the carrier gas (oxygen) is purified and then introduced into the high-frequency furnace. The sample is oxidized by oxygen at the high temperature of the combustion furnace, so that the carbon and sulfur in the seamless steel pipe sample is oxidized to CO2 CO and SO2, the generated oxides pass through the dust removal and water purification device, and are loaded into the sulfur detection cell by oxygen to determine sulfur. After that, the mixed gas containing CO2, CO, SO2, and O2 enters the heated catalyst furnace, where it undergoes catalytic conversion of CO → CO2, SO2 → SO3. After this mixed gas enters the desulfurization reagent tube, Import the carbon detection cell to measure carbon. The residual gas is discharged from the analyzer to the outdoors. At the same time, the ...

  From smelting to rolling, pipe processing and heat treatment of seamless steel pipes , the chemical composition, metallography, mechanics, and metal physical properties must meet the requirements for use.   The performance of seamless steel pipes can be divided into two categories:   Performance: including mechanical properties, physical properties, chemical properties Process performance: including casting performance, pressure processing performance, welding performance, cutting performance, heat treatment performance. Simply put, the mechanical properties of seamless steel pipes are the ability of seamless steel pipes to resist external forces. The external force acting on the metal material. According to the nature of the load, it can be divided into static load, impact load and alternating load. Commonly used mechanical performance indicators are: strength, plasticity, hardness, impact toughness, fatigue strength, etc.   The strength of seamless steel pipe ref...

      How to distinguish the authenticity of 16mn seamless steel pipe? 1. Fake and shoddy 16mn seamless steel pipes are easy to fold. Folding is a variety of fold lines formed on the surface of the 16mn seamless steel pipe. This defect often runs through the longitudinal direction of the entire product. The reason for the folding is that the counterfeit manufacturers are pursuing high efficiency, the amount of reduction is too large, and the ears are generated. The folding occurs during the next rolling. The folded product will crack after bending, and the strength of the 16mn seamless steel pipe will be greatly reduced.   2. Fake and inferior 16mn seamless steel pipes often have pitting on the surface. The pitted surface is caused by the serious wear of the rolling groove, which causes the irregular uneven surface of the 16mn seamless steel pipe. As the manufacturers of counterfeit and inferior 16mn seamless steel pipes are pursuing profits, the groove rolling of...

Seamless steel pipe occupies an important position in the national social economy. Perhaps our friends do not understand it very well, but it has been widely used in petroleum and chemical management and other aspects, bringing a new dimension to people ’ s lives. Great convenience. Seamless steel pipes are also divided into many categories in my country. Among them, Chinese stainless steel pipes are generally used by students in an ideal living environment. 　　 It is not difficult to find in life that the garden fences and staircase handrails that people see are all made of stainless steel pipes. The stainless steel pipe is small in size, which is convenient for people to install. It also has good corrosion resistance, thereby reducing a lot of unnecessary expenses, especially when it is used as a garden fence, it will not be corroded in a humid environment. Stainless steel pipes also have strong toughness, but this toughness is directly related to the size of the hole diameter. As a s...

 Steel pipe geometry and shape inspection: ① Inspection of steel pipe wall thickness: micrometer, ultrasonic thickness gauge, no less than 8 points at both ends and record. ②Examination of steel pipe outer diameter and ovality: caliper, vernier caliper, ring gauge, measure the maximum and minimum points. ③ Steel pipe length inspection: steel tape measure, manual and automatic length measurement. ④ Inspection of steel pipe curvature: straightedge, level (1m), feeler gauge, thin wire to measure curvature per meter and full length curvature. ⑤ Inspection of bevel angle and blunt edge of steel pipe end face: Square, card board. Steel pipe surface quality inspection: 100% ① Manual visual inspection: lighting conditions, standards, experience, signs, steel pipe rotation. ②Non-destructive inspection: a. Ultrasonic flaw detection UT: It is more sensitive to the surface and internal crack defects of various materials with uniform materials. 　　 Standard: GB/T 5777-1996 Level: C5 b. Eddy curr...