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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.

 

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. Polished stainless steel is a popular option for applications where a high level of shine and reflectivity is desired. This finish is achieved by mechanically polishing the surface of the steel using progressively finer abrasive materials until the desired level of shine is achieved. AP (Annealed & Pickled) stainless steel is a finish that is achieved by annealing the steel to remove any stress or deformation that may have occurred during the manufacturing process, and then pickling the steel to remove any surface impurities. This finish is often used in applications where corrosion resistance is particularly important. BA (Bright & Annealed) stainless steel is a finish that combines the characteristics of both polished and AP finishes. The steel is first annealed to remove any stress, and then mechanically polished to achieve a high level of shine. This finish is often used in applications where both corrosion resistance and a bright, reflective appearance are important. MF (Mechanical Finish) stainless steel is a finish that is achieved by mechanically treating the surface of the steel using a variety of techniques, such as shot blasting, brushing, or sanding. This finish provides a textured surface that can be useful in applications where slip resistance is important. Overall, the choice of stainless steel finish will depend on the specific requirements of the application. By understanding the properties and characteristics of each finish, it is possible to choose the one that will provide the best performance and appearance.
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

 

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

 

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

 

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

 

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

 

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

 

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

 

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.

 

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.

 

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:

• Oil and gas industry: ASTM A789 stainless steel tube is widely used in the oil and gas industry to produce and transport high-temperature, high-pressure gas and liquid.
• Chemical industry: ASTM A789 UNS S31803 tube is also widely used in the chemical industry for the production and delivery of various acids, alkalis, and salt solutions.
• Seawater desalination: used in the construction of seawater desalination equipment, such as evaporators, condensers, brine discharge tubes, etc.
• Sewage Treatment: Used in tubing systems and treatment equipment in sewage treatment plants, it is resistant to corrosion and chemical attack.
• Architectural and Structural Engineering: ASTM A789 stainless steel tubes can also be used in architectural and structural engineering, such as the production and transmission of steam and hot water, etc.

 

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