Alloy 31 Seamless Pipes Manufacturer and Supplier Thailand

Alloy 31 seamless pipe is corrosion-resistant pipe made from a high-alloy austenitic stainless steel containing nickel, chromium, and molybdenum. Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd., based in Chon Buri, is a trusted manufacturer and supplier of Nickel Alloy 31 seamless pipes. Our pipes are manufactured to international standards such as ALLOY 1.4562 / UNS N08031 / ASTM B622, and are designed for durability in extreme environments. We follow strict quality assurance practices to ensure reliability and consistency. These seamless pipes are available in a wide range of sizes, thicknesses, and outer diameters which makes us a reliable partner for all your Alloy 31 seamless pipe requirements.

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Alloy 31 Seamless Pipes

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Product Overview Of Alloy 31 Seamless Pipes

Alloy 31 seamless pipes offer exceptional resistance to intergranular corrosion, making them ideal for demanding environments. This nickel alloy pipe is made from an iron-nickel-chromium-molybdenum alloy, enriched with nitrogen and copper to enhance its properties. The alloy 31 pipe is available in sizes ranging from 0.1mm to 100mm wall thickness, with outer diameters from 6.00mm up to 914.4mm, and temperature resistance from -196°C to 550°C. Featuring high levels of chromium and molybdenum, these pipes deliver superior high-temperature strength. They are commonly used in industries like chemical plants, marine engineering, oil & gas, and pharmaceuticals, offering reliability in harsh conditions. Available in seamless, ERW, and EFW pipe forms, these pipes are designed for maximum durability and long service life.

Alloy 31 Seamless Pipes

Key Benefits Of Alloy 31 Seamless Pipes

Alloy 31 seamless pipe benefits such as mechanical strength, corrosion resistance, construction and more that make them perfect for high-temperature and high-pressure applications.

corrosion resistance

Excellent Corrosion Resistance

Alloy 31 provides outstanding protection against a wide range of corrosive environments, ensuring long-term durability even in harsh conditions.

Hygienic Properties

Superior Mechanical Strength

With high tensile strength and yield strength, Alloy 31 delivers enhanced structural integrity, capable of withstanding extreme pressure and temperature.

Durability and Strength

Seamless Construction

The seamless design ensures uniform thickness, higher strength, and a smooth finish, reducing the risk of weak points and improving overall performance.

Environmental Sustainability

Resistance to Sulfuric and Phosphoric Acids

Alloy 31 offers exceptional resistance to sulfuric and phosphoric acids, protecting against corrosion and degradation in highly acidic conditions.

Versatility

Extended Service Life

The material’s durability and resistance to corrosion extend its service life, reducing the need for frequent replacements and minimizing maintenance costs.

Versatility

Versatility

Alloy 31 is highly adaptable, providing reliable solutions across various high-stress, high-temperature environments with a wide range of requirements.

Why Choose Our Alloy 31 Seamless Pipes

Our Alloy 31 seamless pipes are used for their exceptional resistance to corrosion, high strength, and reliability in challenging environments. Manufactured to meet the highest industry standards, our pipes ensure superior performance in various industrial applications. Trust our quality for long-lasting, efficient solutions tailored to your needs.

Competitive Pricing

Competitive Pricing

Global Exports Expertise

Global Exports Expertise

Large Inventory & Fast Dispatch

Large Inventory & Fast Delivery

Custom Sizes & Finishes

Custom Sizes & Special Orders

Industry Certifications & Compliance

Industry Certifications & Compliance

Long service life in harsh conditions

Premium Materials & Strict Quality Control

After-Sales Support, Service- Technical Support

After-Sales Support & Service

In-House Testing & Full Traceability

In-House Testing & Full Traceability

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Specifications Of UNS N08031 Alloy 31 Seamless Pipes

The key specifications of UNS N08031 seamless pipes include dimensions, length,test certificates, shape and more are mentioned below.

Specifications ASTM A/ASME SA312
Standard Size 1/8"NB TO 30" NB IN
Alloy 31 Seamless Pipes 1/2" NB - 16" NB
Outer Diameter 6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB
Thickness 0.3 - 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS, LSAW, SSAW, HSAW
Manufacturing techniques Seamless
Shape Round, Half Round, Square, Rectangular or Custom
Length Single Random, Double Random & Custom Length
Pipe End Plain End, Beveled End, Treaded
Test Certificate EN 10204 3.1 B
Alloy 31 round pipes
Size range Wall thickness: 1mm- 150mm (SCH10-XXS)
Outer diameter: 6mm- 2500mm (3/8"-100")
Alloy N08031 square pipe
Size range Wall thickness: 1mm- 150mm (SCH10-XXS)
Outer diameter: 4mm*4mm- 800mm*800mm
Alloy 31 UNS N08031 rectangular pipes
Size range Wall thickness: 1mm-150mm (SCH10-XXS)
Outer diameter: 6mm-2500mm (3/8"-100")
Length: 4000mm, 5800mm, 6000mm, 12000mm, or as required.

Alloy 1.4562 Seamless Pipes Chemical Composition

The table provides the chemical composition of Alloy 1.4562 seamless pipes, highlighting essential elements like chromium, nickel, and molybdenum that define its corrosion resistance.

Ni Cr C Mn Si Cu Mo N P S Fe
30.00–32.00 26.00–28.00 ≤0.015 ≤2.00 ≤0.030 1.00–1.40 6.00–7.00 0.15–0.25 ≤0.020 ≤0.010 Bal

The chemical composition of Alloy 1.4562 seamless pipes highlights essential elements like chromium, nickel, and molybdenum levels.

Hardness HB 30
≤ HB		 0.2% Yield strength Rp
≥ N/mm²		 Tensile strength Rm
N/mm²		 Elongation As
≥ %		 Modulus of elasticity
kN/mm²
220 275 ≥ 650 40 198

The equivalent table for alloy 20 seamless pipes outlines global standards, grade names, and UNS designations.

Material No. EN Designation UNS Alloy
1.4562 X1NiCrMoCu32-28-7 N08031 31

This alloy 1.4562 seamless pipe size chart details OD, schedule, and length range to guide your project requirements.

Pipe Size O.D. Inches 5s SCH 5 10s SCH 10 20 30 40s & STD SCH 40
1/8 0.405 0.35 0.049 0.049 0.068 0.068
0.1383 0.1863 0.1863 0.2447 0.2447
1/4 0.54 0.049 0.065 0.065 0.088 0.088
0.257 0.3297 0.3297 0.4248 0.4248
3/8 0.675 0.049 0.065 0.065 0.091 0.091
0.3276 0.4235 0.4235 0.5676 0.5676
1/2 0.84 0.065 0.065 0.083 0.083 0.109 0.109
0.5383 0.5383 0.671 0.671 0.851 0.851
3/4 1.05 0.065 0.065 0.083 0.083 0.113 0.113
0.6838 0.6838 0.8572 0.8572 1.131 1.131
1 1.315 0.065 0.065 0.109 0.19 0.133 0.133
0.8678 0.8678 1.404 1.404 1.679 1.679
1 1/4 1.66 0.065 0.065 0.109 0.109 0.14 0.14
1.107 1.107 1.806 1.806 2.273 2.273
1 1/2 1.9 0.065 0.065 0.109 0.109 0.145 0.145
1.274 1.274 2.638 2.638 2.718 2.718
2 2.375 0.065 0.065 0.109 0.109 0.154 0.154
1.604 1.604 2.638 2.638 3.653 3.653
2 1/2 2.875 0.083 0.083 0.12 0.12 0.203 0.203
2.475 2.475 3.531 3.531 5.793 5.793
3 3.5 0.083 0.083 0.12 0.12 0.216 0.216
3.029 3.029 4.332 4.332 7.576 7.576
3 1/2 4 0.083 0.083 0.12 0.12 0.226 0.226
3.472 3.472 4.97 4.97 9.109 9.109
4 4.5 0.083 0.083 0.12 0.12 0.237 0.237 0.281
3.915 3.915 5.613 5.613 10.79 10.79 12.66
4 1/2 5 0.247
12.53
5 5.563 0.109 0.109 0.134 0.134 0.258 0.258
6.349 6.349 7.77 7.77 14.62 14.62
6 6.625 0.109 0.109 0.134 0.134 0.28 0.28
7.585 7.585 9.289 9.289 18.97 18.97
7 7.625 0.301
23.57
8 8.625 0.109 .109 0.148 0.148 0.25 0.277 0.322 0.322
9.914 9.914 13.4 13.4 22.36 24.7 28.55 28.55 35.64
9 9.625 0.342
33.9
10 10.75 0.134 0.134 0.165 0.165 0.25 0.307 0.365 0.365
15.19 15.19 18.65 18.65 28.04 34.24 40.48 40.48 54.74
11 11.75 0.375
45.55
12 12.75 0.156 0.165 0.18 0.18 0.25 0.33 0.375 0.406
21.07 22.18 24.2 24.2 33.38 43.77 49.56 53.53 73.16
14 14 0.156 0.188 0.25 0.312 0.375 0.375 0.437 0.593
23.06 27.73 36.71 45.68 54.57 54.57 63.67 84.91
16 16 0.165 0.188 0.25 0.312 0.437 0.375 0.562 0.75
27.9 31.75 42.05 52.36 62.58 62.58 82.77 107.5
18 18 0.165 0.188 0.25 0.312 0.437 0.375 0.562 0.75
31.43 35.76 47.39 59.03 82.06 70.59 104.8 138.2
20 20 0.188 0.218 0.25 0.375 0.5 0.375 0.593 0.812
39.78 46.05 52.73 78.6 104.1 78.6 122.9 166.4
24 24 0.218 0.25 0.25 0.375 0.562 0.375 0.687 0.968
55.37 63.41 63.41 94.62 140.8 94.62 171.2 238.1
26 26 0.312 0.5 0.375
85.6 136.2 102.6
28 28 0.312 0.5 0.625 0.375
92.26 146.8 182.7 110.6
30 30 0.25 0.312 0.312 0.5 0.625 0.375
79.43 98.93 98.93 157.5 196.1 118.6
32 32 0.312 .5 0.625 0.375 0.688
105.6 168.2 209.4 126.7 230.1
34 34 0.312 0.5 0.625 0.375 0.688
112.3 178.9 222.8 134.7 244.8
36 36 0.312 0.625 0.375 0.75
118.9 236.1 142.7 282.3
40 40 0.375
158.7
42 42 0.375
166.7
48 48 0.375
190.7

Manufacturing Process of Alloy 31 Seamless Pipes

There are 5 steps involved in the nickel alloy 31 seamless pipe manufacturing process which are given below. Every step of production is precisely controlled to comply with stringent industry standards.

Stainless Steel

1. Raw Material Selection
High-quality stainless steel billets and strips are carefully selected for superior strength and corrosion resistance.

2. Pipes Formation

The selected raw material is formed into pipes using seamless extrusion methods, depending on the application.

3. Heat Treatment

Pipes undergo required controlled heat treatment to enhance mechanical properties and relieve internal stresses.

4. Cold Working and Finishing

After heat treatment, pipes are cold-worked for better surface finish, dimensional accuracy and improved strength.

5. Quality Control and Testing

Every pipe is thoroughly inspected and tested to ensure it meets international quality standards for performance and reliability.

Application Of Alloy 31 Seamless Pipes

Nickel alloy 31 seamless pipes are widely used in the chemical processing industry, particularly for handling sulfuric, phosphoric, and nitric acids in production plants. They are also used in flue gas desulfurization units, marine exhaust systems, and pharmaceutical manufacturing.

Oil and Gas Industry

Chemical and Petrochemical Industry

Food and Beverage Industry

Pharmaceutical & Biotechnology

Aerospace & Defense

Automotive and Transportation

Construction and Architecture

Marine & Shipbuilding

Power Generation & Heat Exchange

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FAQ's

What is alloy 31?

Alloy 31 is a specialized nickel, chromium, and molybdenum stainless steel. It also contains additions of nitrogen and copper. This unique composition provides a powerful combination of moderate tensile strength, high ductility, and exceptional corrosion resistance in various aggressive environments, including sulfuric and phosphoric acids.

A31 alloy material is specifically engineered to bridge the performance gap between high-alloyed austenitic stainless steels and more expensive nickel-based alloys. Its chemical composition, rich in nickel and chromium, is designed to offer superior resistance to both general and localized corrosion, such as pitting and crevice corrosion, particularly in halide-containing media. The nitrogen content contributes to its structural stability and strength.

The primary distinction of Alloy 31 seamless pipes is their exceptional resistance to corrosion in both acidic and alkaline halide environments. While many nickel alloys offer good corrosion resistance, Alloy 31 excels in extremely harsh conditions, such as in highly concentrated sulfuric acid and phosphoric acid media. This makes it a more cost-effective choice than some higher-nickel alloys without compromising performance in these specific corrosive applications. Its seamless construction also provides enhanced strength and reliability under pressure.

An Alloy 31 pipe is a tubular product made from the UNS N08031 nickel-chromium-molybdenum alloy. These pipes are manufactured to be seamless, meaning they are created from a solid billet and have no welded seams. This manufacturing process results in a pipe with uniform strength and a high degree of structural integrity, making it ideal for applications involving high pressures and corrosive fluids.

Yes, Alloy 31 seamless pipes are well-suited for high-pressure operations. Their seamless construction removes the weak points that can be present in welded pipes. This inherent strength with the material’s excellent mechanical properties, allow these pipes to be used in pressure vessels and other applications with temperatures ranging from as low as −196 ∘ C to as high as 550 ∘ C (−321 ∘ F to 1022 ∘ F).

Alloy 31 seamless pipes are widely used in industries that deal with highly corrosive substances. Major applications include chemical and petrochemical processing, pulp and paper manufacturing (especially in bleaching plants), flue gas desulfurization (FGD) systems, and mining and ore processing. They are also utilized in seawater heat exchangers and in the oil and gas industry for applications involving sour gas.

Alloy 31 has very good weldability. It can be welded using common techniques such as Gas Tungsten Arc Welding (GTAW or TIG) and Gas Metal Arc Welding (GMAW or MIG). To maintain the corrosion resistance of the welded joint, it is crucial to use a matching or over-alloyed filler metal, such as an Alloy 59 filler. Proper cleaning of the joint area before and after welding is also essential to prevent contamination and ensure the integrity of the weld.

Yes, it is common for suppliers of specialty metals to offer customized Alloy 31 seamless pipes. These customizations can include specific outer diameters, wall thicknesses, and lengths to meet the precise requirements of a project. Additionally, services such as cutting to length, special testing, and various surface finishes can often be provided upon request to ensure the pipes are ready for their intended application.

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