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Looking for high-quality and reliable stainless steel tubing? Look no further than ASTM A789, the trusted source for the best in duplex stainless steel tubes. At ASTM A789, we offer a wide range of tube options to fit any application, including stainless steel tubing, seamless tubing, and welded tubing. With a range of sizes and materials available, including S31803, S32750, and more, we offer the perfect solution for any project. Plus, with competitive pricing and fast delivery, you can count on us for your stainless steel tubing needs. Contact us today to learn more about our products and services.
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ASTM A789 duplex stainless steel tube is produced in both seamless and welded forms, following the standards of ASTM A789 and ASTM A1789M. This type of tube consists of an equal distribution of approximately 50% ferrite and 50% austenite. One of its notable qualities is its superior resistance to stress corrosion in neutral chloride solution and H2S, surpassing that of other stainless steel variants like 304L, 316L austenitic stainless steel, and 18-5mo duplex stainless steel.
Specifically designed for various applications, ASTM A789 tube performs exceptionally well in a temperature range spanning from -50°F to +600°F. Although it can also be utilized beyond this temperature spectrum, there are certain limitations to consider, especially in welded structures. It is essential to take into account these factors when contemplating its usage in applications outside the recommended temperature range.
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The specifications of ASTM A789 Duplex Stainless Steel Tube are as follows. Please provide a rearranged content based on the original text information:
ASTM A789 Duplex Stainless Steel Tube specifications include various parameters and standards that ensure its superior performance. This type of tube is widely used in various industries due to its exceptional corrosion resistance and high strength.
The A789 standard specifies the requirements for seamless and welded tubes made of duplex stainless steel. These tubes are fabricated using a combination of austenitic and ferritic phases, providing a unique balance of mechanical and corrosion-resistant properties.
The outer diameter of the ASTM A789 Duplex Stainless Steel Tube ranges from 6.0mm to 630mm, while the wall thickness can vary from 0.5mm to 30mm. Some common sizes include 1/8" to 24" NB for seamless tubes and 1/2" to 24" for welded tubes.
The heat treatment process for these tubes may involve annealing or solution annealing, depending on the desired mechanical properties and corrosion resistance. The tubes can be cold worked or hot finished, depending on the application requirements.
In terms of chemical composition, the ASTM A789 Duplex Stainless Steel Tube typically contains elements such as chromium, nickel, molybdenum, and nitrogen. These alloying elements contribute to the tube's high resistance to pitting and crevice corrosion, making it suitable for challenging environments.
The mechanical properties of this tube meet the specified requirements for yield strength, tensile strength, and elongation. The impact toughness and hardness of the tubes can be modified through appropriate heat treatment processes.
To ensure the quality and reliability of the ASTM A789 Duplex Stainless Steel Tube, it undergoes various tests such as hydrostatic testing, eddy current testing, and visual inspection. These tests verify the tube's integrity, dimensional accuracy, and surface finish.
In conclusion, the ASTM A789 Duplex Stainless Steel Tube offers several advantages due to its unique composition and manufacturing process. Its specifications ensure that it meets industry standards and can withstand demanding applications where corrosion resistance and strength are crucial.
Standard | ASTM A789 / A789M, ASME SA789 |
Seamless pipe & Tube Size | 1/2†to 8†IN |
Welded pipe & Tube Size | 6†to 24†IN |
Outer Diameter | 6.0-630mm |
Schedules | 10s, 20, 40, 40s, 5s, 80s, 80, 100, 120, 140, 160, XXH. It's important to note that these numbers represent time intervals in seconds or XXH which could refer to extreme heavy-duty usage. The order of these numbers can be important in determining the appropriate duration or speed for a particular activity. For example, a 5-second sprint may be appropriate for a short burst of energy while a 160-second activity may require more endurance. It's always important to choose the right time interval for the right activity to achieve optimal results. |
Wall Thickness | 1mm to 50mm |
Finish |
In the world of stainless steel, there are several different finishes that can be applied to the surface of the metal. These finishes serve a variety of purposes, from enhancing the appearance of the steel to improving its properties. Some of the most common stainless steel finishes include polished, AP (Annealed & Pickled), BA (Bright & Annealed), and MF. |
Form | We offer a wide range of tube options to meet your specific needs. Whether you require round, square, rectangular, hydraulic, straight, or ‘U’ bent tubes, we have got you covered. Our diverse selection ensures that you can find the perfect tube for your application. Whether it's a round tube for structural support or a square tube for architectural design, we have the right solution for you. Our hydraulic tubes are designed to withstand high-pressure environments, while our straight tubes provide a seamless flow for fluid and gas transportation. If you require a more specialized shape, our rectangular and 'U' bent tubes are available to accommodate your unique requirements. No matter what type of tube you need, you can rely on our exceptional quality and reliable performance. Choose from our extensive range of tubes and experience the difference in your applications. |
Length | Single Random, Double Random, and Cut Length. |
End | Plain End, Beveled End, Treaded |
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ASTM A789 Standard Dimensional Tolerance
ASTM A789 | Size, Outside Diameter, [mm] |
Permissible Variations, in OD |
Permissible Variations, in WT |
Permissible Variations, in Length |
Thin Wall Tube |
D<12.7 | ±0.13mm | ±15% | 3mm | ... | |
12.7-38.1 | ±0.13mm | ±10% | 3mm | WT<1.6mm | |
38.1-88.9 | ±0.25mm | ±10% | 5mm | WT<2.4mm | |
88.9-139.7 | ±0.38mm | ±10% | 5mm | WT<3.8mm | |
139.7-203.2 | ±0.76mm | ±10% | 5mm | WT<3.8mm |
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ASTM A789 Duplex Stainless Steel Tube Chemical Composition
Grade | C≤ | Mn≤ | P≤ | S≤ | Si≤ | Ni | Cr | Mo | N | Cu |
S31803 | 0.03 | 2.00 | 0.03 | 0.02 | 1.00 | 4.5–6.5 | 21.0–23.0 | 2.5–3.5 | 0.08–0.20 | - |
S32205 | 0.03 | 2.00 | 0.03 | 0.02 | 1.00 | 4.5–6.5 | 22.0–23.0 | 3.0–3.5 | 0.14–0.20 | - |
S32750 | 0.03 | 1.20 | 0.035 | 0.02 | 0.80 | 6.0-8.0 | 24.0-26.0 | 3.0-5.0 | 0.24-0.32 | 0.5 |
S32760 | 0.05 | 1.00 | 0.03 | 0.01 | 1.00 | 6.0-8.0 | 24.0-26.0 | 3.0-4.0 | 0.20-0.30 | 0.50–1.00 |
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ASTM A789 Material Mechanical Properties
Mechanical properties | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) | Hardness, HB(max) |
S31803 | 90 [620] | 65 [450] | 25 | 290 |
S32205 | 95 [655] | 65 [450] | 25 | 290 |
S32750 | 116 [800] | 80 [550] | 15 | 300 |
S32760 | 109 [750] | 80 [550] | 25 | 300 |
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ASTM A789 Tube Heat Treatment
UNS Designation | Temperature °F [°C] | Quench |
S31803 | 1870-2010℉(1020-1100℃) | Rapid cooling in air or water |
S32205 | 1870-2010℉(1020-1100℃) | Rapid cooling in air or water |
S32750 | 1880-2060℉(1025-1125℃) | Rapid cooling in air or water |
S32760 | 2010-2085℉(1100-1140℃) | Rapid cooling in air or water |
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Physical Properties of UNS S31803 and S32205
Grade | Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Co-eff of Thermal Expansion (μm/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat 0-100°C ( J/kg.K) |
Electrical Resistivity (nΩ.m) |
|||
0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
2205 | 782 | 190 | 13.7 | 14.2 | - | 19 | - | 418 | 850 |
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Physical Properties of ASTM A789 UNS S32750
Density (Kg.m-1) | 7810 |
Magnetic Permeability | 33 |
Young’s Modulus (N/mm2) | 199 x 103 |
Specific Heat, 20°C (J.Kg-1.°K-1) | 475 |
Fracture Toughness, Kq (MPa.m) | 475 |
Specific Electrical Resistance, 20°C (µO.m) | 0.8 |
Thermal conductivity, 20°C (W.m-1.°K-1) | 14.2 |
Mean coefficient of thermal expansion, 20-100°C (°K-1) | 11.1 x 10-6 |
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ASTM A789 Stainless Steel Tube Grades
ASTM A789 is a specification for the production of stainless steel seamless and welded tubes, including ASTM A789 welded tubes and ASTM A789 seamless tubes. This specification covers a variety of stainless steel alloys, Austenitic (austenitic) and Ferritic (ferritic) duplex stainless steels. ASTM A789 stainless steel tube grades include S31803, S32205, S32750, S32760, S31500, S32550, S31200, S31260, S32001, S32304, S39274, S32900, S32950, S39277, S32520, S32906. For example ASTM A789 duplex steel S31803 tubes, ASTM A789 duplex steel S32205 tubes, duplex stainless steel tubes S32750, ASTM A789 duplex steel S32750 tubes, etc.
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ASTM A789 Tube Fabrication
ASME SA789 covers stainless steel tubes in nominal wall thickness classes for service requiring general corrosion resistance with particular emphasis on stress corrosion cracking resistance. During the production process, ASTM A789 UNS S31803 is subject to heat treatment procedures, so that the heat temperature and quenching conditions adopted by ASTM A789 duplex tube materials meet the specifications. In addition to certain types of testing on the material, it is also mandatory for ASTM A789 boiler tubes to meet specified tensile and hardness properties.
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Application of ASTM A789 Duplex Stainless Steel Tube
ASTM A789 duplex stainless steel tube is generally resistant to corrosion, high temperature, and high-pressure capability, ASTM A789M duplex stainless steel tube is suitable for boilers, superheaters, and heat exchangers. ASTM A789 stainless steel tubing is used in a wide variety of applications, including the following:
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