1.4401 vs 1.4429 stainless steel pipe : Composition

Choosing the right stainless steel grade for your pipes is crucial for ensuring longevity and performance, especially in corrosive environments and high-temperature applications. Two commonly compared grades are 1.4401 (AISI 316) and 1.4429 (AISI 316LN). While both belong to the 316 family of stainless steels, they differ in chemical composition, which affects their mechanical properties and performance.

In this guide, we'll compare 1.4401 vs 1.4429 stainless steel pipes and answer 5 common industry questions that will help you make an informed decision.

 

1. What is 1.4401 Stainless Steel pipe ?

1.4401 (AISI 316) is an austenitic stainless steel known for its excellent corrosion resistance, particularly in chloride-rich environments like marine applications. It contains 16-18% chromium, 10-14% nickel, and 2-3% molybdenum, which provide high resistance to pitting and crevice corrosion. Common applications include chemical processing, marine equipment, and food processing systems.

 

2. What is 1.4429 Stainless Steel pipe?

1.4429 (AISI 316LN) is a low-carbon, nitrogen-enriched version of 316. The addition of nitrogen enhances strength and creep resistance, making it suitable for applications requiring high strength at elevated temperatures. This grade is commonly used in chemical processing and power generation, where resistance to stress corrosion cracking is essential.

 

Chemical Composition

Element	1.4401 (AISI 316)	1.4429 (AISI 316LN)
Chromium (Cr)	16.5 – 18.5%	17.0 – 19.0%
Nickel (Ni)	10.0 – 14.0%	10.0 – 14.0%
Molybdenum (Mo)	2.0 – 3.0%	2.5 – 3.0%
Carbon (C)	≤ 0.07%	≤ 0.03%
Manganese (Mn)	≤ 2.0%	≤ 2.0%
Silicon (Si)	≤ 1.0%	≤ 1.0%
Phosphorus (P)	≤ 0.045%	≤ 0.045%
Sulfur (S)	≤ 0.015%	≤ 0.015%
Nitrogen (N)	–	0.10 – 0.22%

Mechanical Properties (at room temperature)

Property	1.4401 (AISI 316)	1.4429 (AISI 316LN)
Tensile Strength (Rm)	500 – 700 MPa	520 – 700 MPa
Yield Strength (Rp0.2)	≥ 200 MPa	≥ 210 MPa
Elongation (A5)	≥ 40%	≥ 35%
Hardness (HB)	≤ 217 HB	≤ 217 HB
Modulus of Elasticity	~193 GPa	~195 GPa

 

Does the general corrosion resistance of 1.4401 stainless steel round tube surpass that of 1.4429?

The general corrosion resistance of 1.4401 (316) is inferior to that of 1.4429 (316Ti). 1.4429, with titanium addition (≥5×C%), more effectively inhibits the combination of carbon and chromium to form carbides, significantly enhancing resistance to intergranular corrosion. Its corrosion stability outperforms 1.4401, especially in high-temperature (400-800°C) environments and prolonged exposure to corrosive media.

 

Which offers better cost-effectiveness between 1.4401 and 1.4429 stainless steel tubes?

1.4401 provides better cost-effectiveness. Due to titanium addition and stricter composition control, 1.4429 incurs higher raw material and production costs, with prices typically 10%-20% higher than 1.4401.

 

Can 1.4401 stainless steel tubes substitute 1.4429?

1.4401 can replace 1.4429 in most conventional scenarios, but not in high-temperature or high-intergranular-corrosion-risk environments. In equipment such as boiler pipes and heat exchangers operating at elevated temperatures long-term, 1.4429's advantage in intergranular corrosion resistance is critical. Substituting with 1.4401 may lead to premature failure.

 

GNEE Stainless is an independent stockist and fabricator of 316/316L stainless steel. With our extensive inventory and exceptional fabrication capabilities, we are able to meet most project requirements, whether from stock or custom. We offer: stock-size tubing and pipe, as well as any necessary fabrication services. For any inquiries, please email sales@gneestainless.com

 

1.4401 Stainless Steel Pipe in stock

Product Type	Surface Finish	Outer Diameter Range	Wall Thickness	Length	Standard	Typical Applications
1.4401 Seamless Pipe	Pickled, Bright Annealed	6mm – 610mm	0.5mm – 40mm	6m or custom	ASTM A312 / EN 10216-5	Chemical, petrochemical, high-temp systems
1.4401 Welded Pipe	Polished, Brushed	10mm – 1219mm	0.4mm – 8mm	6m / 12m / custom	ASTM A249 / EN 10217-7	Water systems, structural parts, machinery
1.4401 Sanitary Pipe	180–600G Polished	12.7mm – 219mm	0.8mm – 3mm	6m or custom	ASTM A270 / DIN 11850	Food, beverage, and pharmaceutical industries
1.4401 Heat Exchanger Tube	Pickled	12mm – 38mm	0.5mm – 2mm	Straight/U-bent	ASTM A213 / EN 10216-5	Boilers, condensers, heat exchangers
1.4401 Square/Rectangular Pipe	Brushed, Sandblasted	10×10mm – 150×150mm	1mm – 6mm	6m or custom	ASTM A554 / EN 10219	Decorative frames, supports, structural works

In addition, we can also accept customization. If you have any questions on your project, you can contact our engineers in time to solve it!

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