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By certification 
DEKUN provides different kinds of stainless steel tubes, and those stainless steel pipes that are thicker than a certain value from the inside out are called thick wall stainless steel tubes. Thick wall stainless steel pipes are definitely better than ordinary pipes. First, because the seamless structure pipe wall and pipe body are very smooth; Second, because it is not raw steel, stainless steel is resistant to high temperature and cold, and will not be deformed or distorted. thick wall stainless steel seamless tubes play a great role in the process of modern industrialization. They are widely used in hot-rolled (extruded, expansion) and cold-drawn (rolled) seamless steel pipes made of corrosion-resistant pipes and stainless steel for structural parts and parts in chemical, petroleum, petroleum, textile, medical, food, machinery, and other industries.
Product Specification
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Product Name |
High Pressure Thick Wall Stainless Steel Seamless Tube |
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Material |
Steel, stainless steel, duplex steel, PH steel, nickel alloy |
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Shape |
Round or square |
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Grade |
304, 304L, 316, 316L, 310s, 321, 309, etc. |
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Specification |
φ6-273mm; δ1-30mm; Length 1000-8000mm |
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Standard |
GB,AISI,ASTM,DIN,EN,SUS,UNS, etc |
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Inspection |
ISO,SGS,BV and so on |
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Product Characteristics |
The pipe body is smooth; resistant to high temperature and cold; will not be deformed or distorted. |
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Application |
Oil pipelines, fluid transportation, building construction, etc. |
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Packaging |
Cases packed in wooden cases; Paper packaging; Plastic packing; Foam packaging. Packaging according to customer requirements or products. |
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Delivery |
7-25 days or According to the product. |
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Payment |
L/C, D/A, D/P, T/T, Western Union, Money Gram, According to customer requirements payments for offline orders. |
Production Process
The general production process of thick wall stainless steel seamless tubes can be divided into cold drawing and hot rolling. The production process of cold-rolled seamless steel pipes is generally more complicated than hot rolling. The billet should first be rolled with three-roll continuous rolling, and the diameter test should be carried out after extrusion. If the surface does not respond to the crack, the round pipe will be cut through the cutting machine and cut into a billet about one meter in length. Then enter the annealing process. The annealing should be pickled with acidic liquid. When pickling, pay attention to whether there are a large number of bubbles on the surface. If there are a large number of bubbles, the quality of the steel pipe does not meet the standard of response. In appearance, cold-rolled seamless steel pipes are shorter than hot-rolled seamless steel pipes. The wall thickness of cold-rolled seamless steel pipes is generally smaller than hot-rolled seamless steel pipes, but the surface looks brighter than thick-walled seamless steel pipes. The surface is not too rough, and the caliber is not much burrs.
Application Areas
* Oil pipelines must use this thick wall stainless steel pipe as a means of transportation. Because of its high quality, oil spills do not occur. Thick-walled seamless pipes are a necessary material tool for many oil companies.
* Structural stainless steel pipes (GB/T14975-2002) are seamless steel pipes for general structures and mechanical structures.
* Stainless steel seamless steel pipe for fluid transportation (GB/T14976-2002) is a general seamless steel pipe used to transport fluids such as water, oil and gas. It is usually a hot-rolled (extrusion, expansion) and cold-drawn (rolled) seamless steel pipe made of stainless steel.
* This kind of steel pipe will be used in construction. For example, in the northern region, the terrain is flat and the machinery is developed. The medium steel pipe will be used when watering the fields. For example, these steel pipes will be used in the process of building cities. For example, when building roads, this kind of steel pipes will be used when building docks. And when providing water, the water we use, as well as the water we discharge, is done with this kind of steel pipe.
* In addition, the gas we use to send west-to-east gas is transmitted with this kind of steel pipe.
* With the utilization of high-sulfur crude oil resources and the promotion of the efficient conversion of heavy (slag) oil to obtain more light oil products such as gasoline and diesel, heavy (slag) oil hydrogenation (RHT) technology and its new combination process (RICP) with catalytic cracking (FCC) have significantly improved the yield of lightweight oil products. The general operating temperature of hydrogenation units is about 400 °C and the pressure is 10-15MPa. The conveying medium generally includes heavy oil (residue oil), various catalysts, detergents, hydrogen, waste residue (sulfide, acidic water), etc. The hydrocracking device needs to operate under high temperature, high pressure and hydrogen (high ratio H2 (H2S), H2+ oil and gas (H2S)) corrosion media. H+, HS- and S2- will be ionized in aqueous solution. The corrosion of stainless steel is a hydrogen depolarization process. It is easy to cause hydrogen-induced cracking (HIC), sulfide application corrosion cracking (SSCC) and electrochemical corrosion. It is also accompanied by many changes in conditions such as CO2, NH4+ and CN-content and PH value, resulting in tube rupture failure. Therefore, UNSTP347 stainless steel pipes used in high-temperature, high-pressure and hydrogen-critical environments need to have good mechanical properties and corrosion resistance.
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