What Is Inox 316L material? Meaning, Properties, Composition and Applications

What Is Inox 316L Material? Meaning, Properties, Composition and Applications

When searching for stainless steel materials in European, South American, or international markets, you may frequently encounter the term Inox 316L. But what does Inox 316L mean? Is it different from AISI 316L stainless steel?

The term "Inox" is commonly used in many European and international markets as a general name for stainless steel. Therefore, Inox 316L and AISI 316L generally refer to the same stainless steel grade when the applicable product standard and material requirements are equivalent.

 

 

What Does Inox 316L Mean?

Inox 316L means 316L stainless steel, where "Inox" is a commonly used term for stainless steel and "316L" identifies a specific low-carbon austenitic stainless steel grade.

The material contains chromium (Cr), nickel (Ni), and molybdenum (Mo). Its molybdenum content improves resistance to pitting and crevice corrosion in chloride-containing environments, while its low carbon content helps reduce the risk of sensitization during welding.

The letter "L" stands for "Low Carbon." Compared with standard 316 stainless steel, 316L has a lower maximum carbon content of 0.030%, making it particularly suitable for welded components and fabricated equipment.

 

Is Inox 316L the same as 1.4404?

Yes. 1.4404 is the EN numeric designation for the low-carbon molybdenum austenitic stainless steel equivalent to AISI 316L. They are considered interchangeable in most international specifications.

 

Inox 316L Material Equivalents

Standard / Region	Grade / Designation
USA (AISI / ASTM)	AISI 316L / UNS S31603
Europe (EN / DIN)	1.4404 / X2CrNiMo17-12-2
Japan (JIS)	SUS316L
China (GB)	022Cr17Ni12Mo2 (formerly 00Cr17Ni14Mo2)
Common Names	Inox 316L / V4A / Marine Grade Stainless Steel*

Note: V4A and Marine Grade Stainless Steel are common commercial descriptions, not formal equivalent material designations. Actual material equivalence should be confirmed against the applicable standard.

 

Inox 316L Chemical Composition (ASTM A240 / EN 10088-3)

Chemical composition in weight percent (wt.%). Maximum values are indicated by ≤.

Element	ASTM A240 (wt.%)	EN 10088-3 (wt.%)
Carbon (C)	≤ 0.030	≤ 0.030
Chromium (Cr)	16.0–18.0	16.5–18.5
Nickel (Ni)	10.0–14.0	10.0–13.0
Molybdenum (Mo)	2.00–3.00	2.00–2.50
Manganese (Mn)	≤ 2.00	≤ 2.00
Silicon (Si)	≤ 0.75	≤ 1.00
Phosphorus (P)	≤ 0.045	≤ 0.045
Sulfur (S)	≤ 0.030	≤ 0.015 (Long Products)*
Nitrogen (N)	≤ 0.10	≤ 0.10
Iron (Fe)	Balance	Balance

 

Inox 316L Mechanical Properties (Room Temperature, Annealed Condition)

Mechanical Property	Metric Value	Imperial Value
Tensile Strength (Rm)	≥ 485 MPa	≥ 70 ksi
0.2% Proof Strength (Rp0.2)	≥ 170–220 MPa*	≥ 25–32 ksi*
Elongation at Break (A5)	≥ 40%	≥ 40%
Reduction of Area (Z)	≥ 50%	≥ 50%
Brinell Hardness (HBW)	≤ 217	≤ 217
Rockwell Hardness (HRB)	≤ 95	≤ 95
Vickers Hardness (HV)	≤ 220	≤ 220

Note: Yield strength requirements vary according to the applicable product standard, thickness, and product form. The 170–220 MPa range should not be interpreted as one universal minimum requirement.

 

Inox 316L Physical Properties

Physical Property	Condition / Temperature	Typical Value
Density	20°C	8.0 g/cm³ (8,000 kg/m³)
Melting Range	Solidus–Liquidus	1,375–1,400°C
Modulus of Elasticity (Young's Modulus)	20°C	193–200 GPa
Thermal Conductivity	100°C	16.3 W/(m·K)
Specific Heat Capacity	20°C	500 J/(kg·K)
Coefficient of Thermal Expansion	0–100°C	16.5 × 10⁻⁶ K⁻¹
Electrical Resistivity	20°C	0.74 × 10⁻⁶ Ω·m
Magnetic Permeability (μr)	Annealed Condition	Approximately 1.02

Note: Physical properties are typical reference values and may vary with temperature, processing, and material condition.

 

Inox 316L Heat Treatment and Processing Guidelines

Process	Temperature Range / Conditions	Cooling Method / Requirements
Solution Annealing	1,040–1,150°C (1,900–2,100°F)	Rapid cooling, typically water quenching or rapid air cooling as appropriate
Hot Working / Forging	Starting: 1,150–1,200°C; Finishing: approximately 900°C	Air cooling
Cold Working	Readily cold-workable; strength and hardness increase with deformation	No cooling requirement
Welding	TIG (GTAW), MIG (GMAW), and other suitable welding processes	Generally no preheating or post-weld heat treatment required

 

 

 What is the density of Inox 316L?

The typical density of 316L stainless steel is approximately 8.0 g/cm³, which is equivalent to approximately 8,000 kg/m³.

 

 Chloride Corrosion Resistance

The main difference between Inox 316L and Inox 304L is the addition of 2%–3% molybdenum (Mo) in 316L. This significantly improves its resistance to pitting and crevice corrosion in mildly brackish water, seawater under low-flow conditions, road de-icing salts, and chloride-containing process fluids. In many coastal and offshore applications, 316L is considered the minimum required material grade.

 

 Weld Integrity Without Post-Weld Heat Treatment

Due to its strictly controlled carbon content of ≤ 0.03%, Inox 316L has excellent resistance to sensitization (chromium carbide precipitation) in the heat-affected zone during welding. Under most service conditions, welded joints retain good resistance to intergranular corrosion, eliminating the additional costs and lead-time delays associated with solution annealing large fabricated components after welding.

 

 Excellent Formability and Ductility

As an austenitic stainless steel, Inox 316L offers excellent deep-drawing, bending, and cold-forming properties. It is widely used in the manufacture of stamped components, spun parts, tubing, and pressure vessel heads, with a low risk of cracking during forming operations. Its high elongation also enables it to absorb impact and vibration loads effectively.

 

 Broad Chemical Compatibility

Inox 316L can withstand exposure to a wide range of organic acids, dilute sulfuric acid, phosphoric acid, alkaline solutions, and food-grade cleaning agents. It is a preferred material for hygienic process piping systems in food, beverage, and pharmaceutical manufacturing facilities.

 

 Can inox 316L rust?

inox 316L is stain-resistant, not stain-proof. It can still suffer pitting or crevice corrosion under prolonged exposure to high chloride concentrations (e.g., stagnant seawater, concentrated brine) or in very acidic conditions. Proper surface finish, drainage, and passivation treatment extend service life.

 

 is inox 316L magnetic?

In the fully annealed condition, 316L is essentially non-magnetic. Cold working (bending, drawing, machining) can induce slight magnetism due to partial martensite formation, but this is normal and does not indicate a material defect.

 

 What is the maximum service temperature for inox 316L?

For continuous service in oxidizing atmospheres, approximately 870 °C (1600 °F). In corrosive or reducing atmospheres, the safe limit is lower. For structural load-bearing applications at high temperature, refer to ASME BPVC or applicable design codes for allowable stress values.

 

Main Applications of Inox 316L Stainless Steel

1. Chemical and Petrochemical Industry: 316L stainless steel pipes, plates, and fittings are frequently used in chemical processing equipment, storage tanks, transport pipelines, and industrial vessels.
2. Food and Beverage Processing: Commonly used for food processing tanks, sanitary-grade piping, mixing equipment, and beverage production systems.
3. Pharmaceuticals and Medical Equipment: Utilized in pharmaceutical storage tanks, process piping, cleanroom equipment, and certain medical devices.
4. Marine Engineering: Suitable for use in marine equipment, coastal infrastructure, and various marine components.
5. Water Treatment Systems: Frequently employed in water treatment equipment, filtration systems, pumps, and piping. The suitability of the material depends on factors such as chloride concentration in the water, operating temperatures, water chemistry, and cleaning conditions.

 

inox 316L stainless steel supplier

Material grades: AISI 316L / UNS S31603 / EN 1.4404.

Product forms: Plate, sheet, coil, pipe, tube, and bar.

Standards: ASTM A240, ASTM A312, ASTM A269, ASTM A276, and other applicable specifications.

Quality documentation: EN 10204 3.1 MTC, subject to order requirements.

Inspection options: Chemical composition verification, mechanical testing, PMI, dimensional inspection, and agreed third-party inspection.

Export packaging: Waterproof wrapping, protective film, steel strapping, and export-standard wooden packaging where required.

 

To obtain an accurate quotation, buyers should provide the material grade, product form, standard, dimensions, quantity, surface finish, application, and destination port.
Whether you need Inox 316L stainless steel sheet, plate, coil, seamless pipe, welded tube, or bar, GNEE can help confirm the applicable specification and prepare a quotation based on your project requirements.

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