Nansteel Manufacturing Co.,Ltd

 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...

  Regarding the selection of steel supporting structure steel pipe, which material is better for straight seam steel pipe and spiral steel pipe?   The following analysis gives an introduction from the comparison of the production process and price of the two steel pipes, which can give the practical user an intuitive understanding of the attributes and characteristics of the two steel pipes:   1. Comparison of production and manufacturing processes with materials:   Straight seam steel pipe process   1. Plate inspection: After the steel plate used to manufacture large-diameter LSAW steel pipe enters the production line, the whole plate is first subjected to ultrasonic inspection;   2. Edge milling: double-sided milling of the two edges of the steel plate with a milling machine to achieve the required plate width, plate edge parallelism and bevel shape;   3. Pre-bending: Use a pre-bending machine to pre-bend the edge of the board so that the edge of the...

  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 ...