Views: 7 Author: Site Editor Publish Time: 2025-02-21 Origin: Site
ASTM B729 UNS N08020 Seamless Pipe is an austenitic nickel-iron-chromium alloy containing copper and molybdenum which gives it excellent resistance to sulfuric acid and other corrosive media. It also exhibits good mechanical properties at elevated temperatures. It has high corrosion resistance to sulfuric acid, phosphoric acid and many other acids.
What is ASTM UNS?
ASTM UNS stands for the Unified Numbering System for Metals and Alloys, which is a system for identifying metals and alloys. It was developed by the American Society for Testing and Materials (ASTM) and the Society of Automotive Engineers (SAE).
How does it work?
The UNS uses a series of letters and numbers to identify alloys. For example, UNS S30400 is the UNS designation for 304 stainless steel.
The UNS helps avoid confusion by providing a standard method for identifying materials.
The UNS helps manufacturers and engineers easily identify materials based on their composition and properties.
The UNS helps with indexing, record keeping, data storage and retrieval, and cross-referencing.
What is B729 material?
B729 material refers to a seamless nickel-iron-chromium-molybdenum-copper alloy pipe and tube, as defined by the ASTM B729 standard; essentially, it's a specific type of nickel alloy commonly called "Alloy 20" used in applications requiring high corrosion resistance, particularly in acidic environments with chlorides present.
Key points about B729 material:
Composition: Primarily nickel, with additions of iron, chromium, molybdenum, and copper.
Standard: ASTM B729
Common name: Alloy 20
Properties: Excellent resistance to general corrosion, pitting, crevice corrosion, and chloride stress corrosion cracking.
Applications: Chemical processing equipment, heat exchangers, piping systems handling aggressive chemicals.
What is uns N08020?
UNS N08020 is the alloy designation for a nickel-iron-chromium superalloy, also known as Alloy 20. It's a low-carbon, austenitic alloy that's resistant to corrosion in many chemical environments.
Applications
Chemical processing, petrochemical and refining, marine, pharmaceutical and food processing, heat exchangers, mixing tanks, pumps, valves, fasteners, and fittings.
Properties
Excellent resistance to sulfuric acid, phosphoric acid, nitric acid, and aqueous salt solutions
Good mechanical properties at both ambient and elevated temperatures
Stabilized with niobium to resist intergranular corrosion
Stabilized with columbium to minimize carbide precipitation during welding
ASTM B729 UNS N08020 Seamless Pipe Specification
ASTM Specification | ASTM B729/ASME SB729 |
International Specification | Werkstoff 2.4660, FeMi35Cr20Cu4Mo2 |
Standard | AMS, JIS, NF, DIN, ASTM, AISI, SAE, GB, DS, EN, ASME, TOCT, DTD |
Size of Seamless Pipe | Wall thickness.: 0.05- 20 millimetre, 4 - 219 millimetre |
Seamless Tube Size | 3.35 milimeter To 101.6 milimeter OD |
Tubing wall thickness | 0.020" –0.220", (custom wall thicknesses available) |
Length | Standard & Cut length , Single Random, Double Random Pipe |
Pipe Schedule | SCH80, XXS, SCH10S, SCH5, XS, SCH80, SCH120, SCH160, SCH140, SCH30, STD, SCH40S, SCH40, SCH10, SCH60, SCH20 |
End | Plain End, Beveled End, Treaded Pipe, Screwed ends |
Type | ERW/ Seamless /EFW / Welded / Fabricated /CDW /DOM/CEW Alloy 20 Pipe |
Standard Scope
This specification covers UNS N08020, UNS N08026, and UNS N08024 seamless, cold-worked or hot finished pipe and tube intended for general corrosive service.
The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
Materials and Manufacture
The product of UNS N08020 alloy shall be furnished in the stabilized-annealed condition. The product of UNS N08026 alloy shall be furnished in the solution-annealed condition. The product of UNS N08024 alloy shall be furnished in the annealed condition.
NOTE 1—The recommended annealing temperatures all followed by quenching in water or rapidly cooling by other means are as follows: 1800 to 1850°F (982 to 1010°C) for UNS N08020, 2050 to 2200°F (1121 to 1204°C) for UNS N08026, and 1925 to 1975°F (1052 to 1079°C) for UNS N08024.
Chemical Composition
The material shall conform to the composition limits specified in Table 1. One test is required for each lot as defined in Specification B829.
Table 1-Nickel Alloy 8020 Tubing Chemical Composition
Alloy 20 | Ni | C | Mo | Mn | Si | Fe | Cu | S | P | Cr |
32 – 38 | 0.02 max | 2 – 3 | 1 – 2 | 0.7 max | Bal | 3 – 4 | 0.005 max | 0.02 max | 19 – 21 |
Mechanical and Other Properties
Mechanical Properties—The material shall conform to the mechanical property requirements specified in Table 2
Table 2-Alloy 20 Pipe Mechanical Properties
Tensile Strength | Yield Strength,A | Elongation in 2 in. | ||
ksi | MPa | ksi | MPa | |
80 | 550 | 35 | 240 | 30.0 |
A Yield strength shall be determined by the offset method at 0.2%limiting permanent set in accordance with Test Methods E8.
What is equivalent to uns N08020?
UNS Number | N08020 |
Werkstoff | 2.466 |
ASTM Specifications | A265, B366, B463, B464, B471, B472, B473, B474, B475 |
Other Common Names | Carpenter 20, 20Cb-3, Incoloy Alloy 20, NACE MR0175, CN7M, Carlson Alloy C20, AL 20 |
Alloy 20 Pipe Dimension
NOTE 1—The decimal thickness listed for the respective pipe sizes represents their nominal or average wall dimensions. | ||||||||||
NPS | Outside Diameter | Nominal Wall Thickness | ||||||||
Designator | in. | mm | Schedule 5SA | Schedule 10SA | Schedule 40S | Schedule 80S | ||||
in. | mm | in. | mm | in. | mm | in. | mm | |||
1/8 | 0.405 | 10.29 | 0.049 | 1.24 | 0.068 | 1.73 | 0.095 | 2.41 | ||
1/4 | 0.540 | 13.72 | 0.065 | 1.65 | 0.088 | 2.24 | 0.119 | 3.02 | ||
3/8 | 0.675 | 17.15 | 0.065 | 1.65 | 0.091 | 2.31 | 0.126 | 3.20 | ||
1/2 | 0.840 | 21.34 | 0.065 | 1.65 | 0.083 | 2.11 | 0.109 | 2.77 | 0.147 | 3.73 |
3/4 | 1.050 | 26.67 | 0.065 | 1.65 | 0.083 | 2.11 | 0.113 | 2.87 | 0.154 | 3.91 |
1 | 1.315 | 33.40 | 0.065 | 1.65 | 0.109 | 2.77 | 0.133 | 3.38 | 0.179 | 4.55 |
1 1/4 | 1.660 | 42.16 | 0.065 | 1.65 | 0.109 | 2.77 | 0.140 | 3.56 | 0.191 | 4.85 |
1 1/2 | 1.900 | 48.26 | 0.065 | 1.65 | 0.109 | 2.77 | 0.145 | 3.68 | 0.200 | 5.08 |
2 | 2.375 | 60.33 | 0.065 | 1.65 | 0.100 | 2.77 | 0.154 | 3.91 | 0.218 | 5.54 |
2 1/2 | 2.875 | 73.03 | 0.083 | 2.11 | 0.120 | 3.05 | 0.203 | 5.16 | 0.276 | 7.01 |
3 | 3.500 | 88.90 | 0.083 | 2.11 | 0.120 | 3.05 | 0.216 | 5.49 | 0.300 | 7.62 |
4 | 4.000 | 101.60 | 0.083 | 2.11 | 0.120 | 3.05 | 0.226 | 5.74 | 0.318 | 8.08 |
4 | 4.500 | 114.30 | 0.083 | 2.11 | 0.120 | 3.05 | 0.237 | 6.02 | 0.337 | 8.56 |
5 | 5.563 | 141.30 | 0.109 | 2.77 | 0.134 | 3.40 | 0.258 | 6.55 | 0.375 | 9.52 |
6 | 6.625 | 168.28 | 0.109 | 2.77 | 0.134 | 3.40 | 0.280 | 7.11 | 0.432 | 10.97 |
8 | 8.625 | 219.08 | 0.109 | 2.77 | 0.148 | 3.76 | 0.322 | 8.18 | 0.500 | 12.70 |
10 | 10.750 | 273.05 | 0.134 | 3.40 | 0.165 | 4.19 | 0.365 | 9.27 | 0.500B | 12.70B |
12 | 12.750 | 323.85 | 0.156 | 3.96 | 0.180 | 4.57 | 0.375B | 9.52B | 0.500B | 12.70B |
A Schedules 5S and 10S wall thicknesses do not permit threading in accordance with ANSI B1.20.1.
B These do not conform to ANSI B36.10.
ASTM B729 UNS N08020 Permissible Variations
TABLE 2 Permissible Variations for Outside Diameter and Wall Thickness of Seamless Cold-Worked Pipe and TubeA,B | ||||||
Nominal Outside Diameter, | Permissible Variations | Thickness of Specified Minimum Wall, % | ||||
in. (mm) | Outside Diameter, | Thickness of Specified Nominal Wall, % | Plus | Minus | ||
Plus | Minus | Plus | Minus | |||
Over 0.400 (10) to 5⁄8 (16), excl | 0.005 (0.13) | 0.005 (0.13) | 15 | 15 | 30 | 0 |
5⁄8 (16) to 11⁄2 (38), incl | 0.0075 (0.19) | 0.0075 (0.19) | 10 | 10 | 22 | 0 |
Over 11⁄2 (38) to 3 (76), incl | 0.010 (0.25) | 0.010 (0.25) | 10 | 10 | 22 | 0 |
Over 3 (76) to 41⁄2 (114), incl | 0.015 (0.38) | 0.015 (0.38) | 10 | 10 | 22 | 0 |
Over 41⁄2 (114) to 6 (152), incl | 0.020 (0.51) | 0.020 (0.51) | 12.5 | 12.5 | 28 | 0 |
Over 6 (152) to 65⁄8 (168), incl | 0.025 (0.64) | 0.025 (0.64) | 12.5 | 12.5 | 28 | 0 |
Over 65⁄8 (168) to 85⁄8 (219), incl | 0.031 (0.79) | 0.031 (0.79) | 12.5 | 12.5 | 28 | 0 |
Over 8.625 (219) to 14 (356), incl | 0.062 (1.57) | 0.031 (0.79) | 15 | 12.5 | 30 | 0 |
Over 14 (356) to 24 (610), incl | 0.125 (3.18) | 0.031 (0.79) | 15 | 12.5 | 30 | 0 |
A Ovality—The permissible variations in this table apply to individual measurements, including out-of-roundness (ovality) except for the following:
For pipe and tube having a nominal wall thickness of 3 % or less of the nominal outside diameter, the mean outside diameter shall conform to the permissible variations of this table and individual measurements (including ovality) shall conform to the plus and minus values of the table, with the values increased by 0.5 % of the nominal outside diameter.
For pipe and tube over 41⁄2 in. (114 mm) in outside diameter with a nominal wall thickness greater than 3 % of the nominal outside diameter, the mean outside diameter shall conform to the permissible variations of this table and individual measurements shall not exceed twice the permissible variations of the table.
B Eccentricity—The permissible variations in this table apply to individual measurements including eccentricity
What is the difference between ERW and seamless steel pipe?
The key difference between ERW and seamless steel pipes is that ERW pipes have a welded seam along their length, created through electric resistance welding, while seamless pipes are manufactured from a solid billet of metal without any welded joints, making them generally stronger and more suitable for high-pressure applications; ERW pipes are usually more cost-effective for general use due to their manufacturing process.
ERW (Electric Resistance Welded):
Made by rolling a steel sheet into a cylinder and welding the seam together using electric resistance.
Has a visible weld joint along its length.
Generally less expensive than seamless pipes.
Suitable for lower pressure applications where the weld seam isn't a major concern.
Seamless:
Manufactured by extruding a solid steel billet, creating a hollow pipe without any welds.
Offers greater strength and durability due to the lack of a weld seam.
Commonly used in high-pressure applications like oil and gas pipelines.
Application
Alloy 20 has excellent mechanical properties that get combined with superior corrosion resistance and easy fabrication producing a product that gets utilized in multiple industries. Alloy 20 can be formed in both cold and hot working, and all TIG, MIG, and SAW welding can be performed over the same. The major application of Alloy 20 can be pointed under
- Manufacturing unit of Synthetic rubber
- Pharmaceuticals, plastics and organic and heavy chemicals unit
- Acid cleaning equipment
- Tanks heat exchangers, piping, valves, pumps and another processing unit
- Chemical process piping, reactor vessels
- Petrochemical processing
- Bubble caps
- Food and dye production unit
You can get an offer for products in below material forms:
-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)
-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )
-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)
-Round bar , Billet (ASTM A276, ASTM A479)
- Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)
-Bolting, Nuts（ASTM A193, A194, A320）
ASTM B729 UNS N08020 Seamless Pipe Exported Countries
We Export ASTM B729 UNS N08020 Seamless Pipe to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Europe, Africa, Asia, North America, South America, Middle East.etc
