SS 316LN Seamless Pipes Manufacturer & Supplier in Thailand

Name: Stainless Steel 316LN Seamless Pipes
Brand: Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd.

Stainless steel 316LN seamless pipe is a high-performance, austenitic stainless steel pipe known for its excellent corrosion resistance, superior strength, and reliable performance in extreme environments. Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd., based in Chon Buri, is a trusted manufacturer offering premium-quality SS 316LN seamless pipes that meet international standards such as ASTM and ASME. These pipes are manufactured without any welding joints, ensuring uniform strength and enhanced durability. The added nitrogen in 316LN enhances its mechanical properties compared to 316L, making it ideal for use in chemical processing, marine applications, and pharmaceutical industries where both strength and corrosion resistance are essential. With factory prices and a commitment to quality, we ensure each UNS S31653 pipe undergoes rigorous testing for durability and performance.

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ASTM A312 316LN Stainless Steel Seamless Pipes

DIN 1.4429 / UNS S31653 pipes are designed for superior performance in harsh environments, offering enhanced strength and exceptional corrosion resistance in chloride-rich or high-temperature conditions. These pipes are known for their high structural integrity, pressure tolerance and clean internal finish. Manufactured in compliance with ASTM A312/ASME SA213 standards, these pipes are available in typical dimensions and wall thicknesses meet industrial needs. Common forms include annealed, pickled, cold finished and hot finished, which allows flexibility in various applications. ASTM A376 Grade 316LN Pipes offer excellent resistance to intergranular corrosion and stress corrosion cracking, making them suitable for systems requiring strength at elevated temperatures with minimal carbide precipitation.

Advantages of Stainless Steel 316LN Seamless Pipes

The key advantages of Stainless steel 316LN seamless pipes include enhanced strength, weldability, and corrosion resistance.

These pipes offer extended durability and require minimal maintenance, making them cost-effective in the long run.

Stainless steel 316L offers outstanding weldability, making it easier to fabricate and join components. It is essential for projects requiring customized fittings and seamless integration, especially in complex systems.

316LN pipes maintain strength and resilience in extremely low temperatures, making them ideal for cryogenic applications.

TP316LN S31653 1.4429 seamless stainless steel pipe is highly weldable, ensuring smooth fabrication and reliable connections in various systems.

The low carbon content in 316L stainless steel reduces the risk of carbide precipitation, making these pipes highly resistant to intergranular corrosion, particularly in welding zones.

Due to added nitrogen, they exhibit outstanding resistance to corrosion, including in chloride-rich and high-temperature environments.

Why Choose Thaida for Your Stainless Steel 316LN Seamless Pipes Needs?

Choose us for your stainless steel 316LN seamless pipes needs because we offer reliable supply, customization and high-quality materials. Our pipes are delivered with international certifications. With advanced production technology, consistent quality and competitive pricing, we ensure you receive the best products for your projects.

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Standard Specification For ASTM A312 / ASME SA312 SS 316LN Seamless Pipes

This table provides detailed specifications of Stainless Steel 316LN Seamless pipes, highlighting size, wall thickness, standard, outer diameter, and form.

Specification	ASTM A312 / ASME SA312
Standard	ASTM, ASME and API
Size	1 / 8" NB - 24" NB
Types	Seamless - Hot Rolled / Cold Drawn
Length	Single Random, Double Random & Required Length
Outer Diameter	6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB
Thickness	0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
Schedule	SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Types	Seamless / Cold Drawn / Hot Finish / Cold Finish
Form	Round Pipes, Square Pipes, Rectangular Pipes, Hot Finish Pipes, Cold Drawn pipe
End	Plain End, Beveled End, Treaded

Chemical Composition of ASTM A312 SS 316LN Seamless Pipes

The chemical composition table for Stainless Steel 316LN Seamless Pipes includes elemental percentages focusing on chromium, nickel, and carbon.

Grade	C	Mn	Si	P	S	Cr	Mo	Ni	Other
316LN	≤0.03	≤2.00	≤1.00	≤0.045	≤0.015	16.00–18.00	2.00–2.50	11.00–14.00	N 0.10–0.16

Mechanical Property of SA312 SS 316LN Seamless Pipes

The mechanical properties table for SA312 SS 316LN seamless pipe covers tensile strength, yield strength, elongation, and other metrics below.

Property	Tensile Strength	Yield Strength	Modulus of Elasticity	Poisson’s Ratio	Elongation at Break (in 50 mm)
Metric	515 MPa	205 MPa	190–210 GPa	0.27–0.30	60%
Imperial	74694 psi	29732 psi	27557–30457 ksi	0.27–0.30	60%

Physical Properties of Stainless Steel 316LN Seamless Pipes

The physical properties of Stainless Steel 316LN Seamless Pipes include density, thermal expansion, and melting point.

Property	Value	Unit
Specific Heat (0–100°C)	485	J·kg⁻¹·K⁻¹
Thermal Conductivity	16.3	W·m⁻¹·K⁻¹
Thermal Expansion	16.5	mm/m/°C
Modulus of Elasticity	200	GPa
Electrical Resistivity	7.4	μΩ·cm
Density	7.99	g/cm³

Schedules of 316LN Stainless Steel Seamless Pipes

The 316LN stainless steel seamless pipe schedules with details NB sizes from Sch 5 to Sch 160

NB Sizes	Sch 5	Sch 10	Sch 40	Sch 80	Sch 160
1/8″	✓	✓	✓	✓
1/4″	✓	✓	✓	✓
3/8″	✓	✓	✓	✓
1/2″	✓	✓	✓	✓	✓
3/4″	✓	✓	✓	✓	✓
1″	✓	✓	✓	✓	✓
1 1/4″	✓	✓	✓	✓	✓
1 1/2″	✓	✓	✓	✓	✓
2″	✓	✓	✓	✓	✓
2 1/2″	✓	✓	✓	✓	✓
3″	✓	✓	✓	✓	✓
4″	✓	✓	✓	✓	✓
5″	✓	✓	✓	✓
6″	✓	✓	✓	✓

Manufacturing Process of Stainless Steel 316LN Seamless Pipes

Five main steps are involved in the Stainless steel 316LN seamless pipe manufacturing process, each contributing to the product’s final quality.

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.

Applications of Stainless Steel 316LN Seamless Pipes

Stainless steel 316LN seamless pipes are extensively used in the nuclear power industry, particularly in reactor core piping, heat exchangers, and coolant systems, where materials must withstand high temperatures, radiation, and corrosive environments. These pipes are also used in chemical and petrochemical industries for handling aggressive chemicals, especially in chloride-bearing solutions.

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 316LN stainless steel?

316LN stainless steel is an austenitic stainless steel that belongs to the chromium-nickel-molybdenum family. It is a modification of the common 316L grade, where the ‘L’ denotes low carbon content for increased weldability and corrosion resistance. The ‘N’ refers to the intentional addition of Nitrogen. This serves two main purposes. It provides solid solution strengthening, which compensates for the strength lost due to the low carbon content, and it further enhances corrosion and pitting resistance (especially in chloride environments). This combination makes it a strong material for applications requiring excellent strength and superior resistance to corrosion and sensitization after welding.

What is the difference between AISI 316L and 316LN?

The primary difference lies in the nitrogen (N) content. AISI 316L is a low-carbon version of 316 stainless steel. It is used to prevent sensitization (weld decay) and intergranular corrosion after welding. However, the low carbon also slightly reduces the material’s strength compared to the standard 316 grade. 316LN is a nitrogen-enhanced version of 316L. The added nitrogen not only improves resistance to pitting and crevice corrosion but also acts as a strengthener, raising the minimum specified yield and tensile strength to be similar to or higher than standard 316, while retaining the excellent weldability and corrosion resistance of the low-carbon 316L.

What is the composition of SS316LN?

The composition of SS316LN stainless steel is similar to 316L, but with a controlled addition of nitrogen. The typical composition includes Carbon (C) ≤ 0.03%, Chromium (Cr)16.0 – 18.0%, Nickel (Ni) 10.0 – 14.0%, Molybdenum (Mo) 2.00 – 3.00%, Nitrogen (N) 0.10 – 0.16%, Manganese (Mn) ≤ 2.00%, Silicon (Si) ≤ 1.00%, Phosphorus (P) ≤ 0.045%, Sulfur (S) ≤ 0.030% and Iron (Fe) Balance.

What is the magnetic permeability of stainless steel 316LN?

Stainless steel 316LN is non-magnetic in its fully annealed condition. Its magnetic permeability is very low, typically having a value close to 1.0, similar to a vacuum.

However, a slight increase in magnetism (and thus magnetic permeability) can occur during cold working and welding. Despite these slight changes, the material is generally classified as non-magnetic and is preferred for applications, such as certain parts in electrical, instrumentation, or nuclear industries.