1 / 4 Inch ASTM A789 S31803 Stainless Steel Duplex Steel Tube NDT For Chemical Industry
Specifications of ASTM A789 Tube:
| Grade | Standard | Outside Diameter | 3.18mm-38mm |
S31803/2205
S32750/2507
S32760 | ASTM-A789
...... | Wall Thickness | 0.5mm-3mm |
| Length | ≤30m |
| Surface | Bright Annealed/ Polished/ Annealed Pickled |
| Inspection | Appearance/ Dimensional test, PMI;
NDT: UT/ ET/ HT;
Physical & chemical test |
| Certificates | ISO/PED/AD2000/TS |
| Package | End protection/ Woven bags/ Wooden cases |
Quality Control of MTSCO Duplex Tube:
Quality Assurance for Raw Materials
Our raw materials, sourced from esteemed steel mills such as Baosteel and Tsingshan, undergo stringent warranty and PMI checks to ensure top-notch quality. Stringent PMI checks and other inspections guarantee compliance with material specifications.
Supervised Production Process
From cold rolling, cold drawing, annealing, to pickling and surface treatment, our seamless pipe manufacturing process is meticulously overseen. Skilled engineers, equipped with advanced tools, supervise each phase and capture detailed records through photography. Process cards guarantee precision and traceability throughout production.
Quality Assurance Before Shipment
Our dedicated QC team conducts comprehensive inspections, encompassing appearance, PMI, size, quantity, and more. Mechanical, hardness, ultrasonic, eddy current, and hydraulic tests are carried out. We also welcome third-party evaluations (SGS, TUV, BV) and ensure secure packaging and container reinforcement to ensure product integrity during transportation.
Chemical Composition of ASTM A789 Tube:
| UNS Designation | C | Si | Mn | P | S | Cr | Ni | Mo | N | Cu |
| max | max | max | max | max |
| S31803 | 0.03 | 1 | 2 | 0.03 | 0.02 | 21.0 - 23.0 | 4.5 - 6.5 | 2.5 - 3.5 | 0.08 - 0.20 | - |
| 2205 |
| S32205 | 0.03 | 1 | 2 | 0.03 | 0.02 | 22.0 - 23.0 | 4.5 - 6.5 | 3.0 - 3.5 | 0.14 - 0.20 | - |
| S32750 | 0.03 | 0.8 | 1.2 | 0.035 | 0.02 | 24.0 - 26.0 | 6.0 - 8.0 | 3.0 - 5.0 | 0.24 - 0.32 | 0.5 max |
| 2507 |
| S32760 | 0.05 | 1 | 1 | 0.03 | 0.01 | 24.0 - 26.0 | 6.0 - 8.0 | 3.0 - 4.0 | 0.20 - 0.30 | 0.50 -1.00 |
|
Features of ASTM A789 Tube:
Duplex Seamless tube is a special type of stainless steel tube that consists of two crystalline organizations, austenite and ferrite. This tube has excellent corrosion resistance and high strength, combining the superior corrosion resistance of austenitic stainless steel with the high strength characteristics of ferritic stainless steel. The advantage lies in the excellent mechanical properties without sacrificing toughness and corrosion resistance. Seamless duplex tubes are commonly used in areas that need to withstand highly corrosive environments, such as the chemical industry, offshore engineering, seawater desalination, and the oil and gas industry. These tubes are also used for applications at high temperatures, pressures and in harsh environments, providing a reliable material solution for the industrial sector.
Annealed Pickled VS Polished Surface:
The surface pickling process of stainless steel pipes involves treating the surface with an acidic solution, such as sulfuric or hydrochloric acid, to remove impurities like oxides, oil residue, and welding scales. This method cleanses the surface, eliminating oxide layers and providing a cleaner and smoother appearance to the stainless steel surface. This treatment enhances the corrosion resistance of the pipes and makes them more suitable for various applications, such as in chemical industries and oil processing. The pickled surface of stainless steel pipes typically exhibits increased luster, improving both the quality and appearance of the pipes.
The metal pipeline undergoes a surface polishing process that enhances its appearance and performance through mechanical or chemical treatments. This process involves two main methods: mechanical and chemical polishing.
In mechanical polishing, multiple grinding and polishing stages use varying abrasive particle sizes to progressively refine the metal's surface until achieving the desired smoothness and shine. Employing abrasives and grinding media, the process utilizes rotating or vibrating tools.
Chemical polishing involves applying acidic or alkaline solutions onto the metal surface to eliminate oxidation layers and irregular impurities, commonly utilized for materials like stainless steel, copper, and aluminium.
Enhancing the lustre and smoothness of metal pipes, the polishing process not only improves their visual appeal but also boosts their resistance to corrosion, ease of cleaning, and suitability for specific applications.
ASTM A789 Duplex Steel Seamless and Welded Tubing
ASTM A789 is a standard specification developed by the American Society for Testing and Materials (ASTM) that covers general requirements for seamless and welded ferritic/austenitic stainless steel tubes. These tubes are categorized according to different steel grades, such as S31803, S32205, etc., each of which has a different chemical composition and mechanical properties.
ASTM A789 standard seamless and welded duplex steel pipe has several outstanding properties that make it stand out in many piping applications:
1. Duplex structure: Duplex steel pipe has two different crystal structures, austenite and ferrite, giving the pipe excellent strength and corrosion resistance.
2. Good corrosion resistance: These pipes perform well against corrosive media such as brines, chlorides and acids. 3.
3. High Strength: Duplex pipes have excellent tensile strength and are capable of withstanding high pressures, making them suitable for use in high pressure piping systems.
4. Wide Temperature Range: ASTM A789 standard pipe can be operated over a wide range of temperatures, including very low and high temperature conditions.
5. Excellent weldability: These pipes are easy to weld and can meet the needs of a variety of projects
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