Is 316 the same as 1.4404?

Introduction To 1.4404 Stainless Steel

1.4404 stainless steel, commonly known as 316L or UNS S31603, is the low-carbon variant of the standard 316 molybdenum-alloyed austenitic stainless steel. Its reduced carbon content (≤0.03%) enhances resistance to intergranular corrosion in the as-welded condition, making it the preferred choice for heavy welded fabrications, chemical processing equipment, pharmaceutical devices, and marine applications where both corrosion resistance and weld integrity are critical. As one of the most versatile and widely used stainless steels, it offers an excellent balance of corrosion resistance, formability, and weldability.

 

Equivalent Grades Of 1.4404 Stainless Steel

Standard	Grade
EN European	1.4404 / X2CrNiMo17‑12‑2
ASTM / UNS	316L / S31603
JIS	SUS316L
Chinese GB	022Cr17Ni12Mo2
Common Name	316L

Available forms: seamless & welded tubes, plates, sheets, round bars, forgings, profiles.

 

Chemical Composition Of 1.4404 Stainless Steel

Element	C	Si	Mn	P	S	Cr	Ni	Mo	N
Content	≤0.030	≤1.00	≤2.00	≤0.045	≤0.030	16.5‑18.5	10.0‑13.0	2.00‑2.50	≤0.10

Ultra‑low carbon (≤0.03%) minimizes chromium carbide precipitation after welding, providing excellent intergranular corrosion resistance without post‑weld heat treatment. Molybdenum improves resistance to chloride pitting & crevice corrosion.

 

Mechanical Properties (Annealed Condition, Room Temperature) Of 1.4404 Stainless Steel

Property	Value
Tensile Strength Rm	500‑700 MPa
0.2% Offset Yield Strength Rp0.2	≥200 MPa
Elongation A	≥40 %
Brinell Hardness HBW	≤215

 

Physical Properties (20 ℃) Of 1.4404 Stainless Steel

Item	Parameter
Density	7.90 g/cm³
Modulus of Elasticity	200 GPa
Coefficient of Linear Expansion	15.9×10⁻⁶ /℃ (20‑100℃)
Thermal Conductivity	16.3 W/(m·K)
Specific Heat Capacity	500 J/(kg·℃)
Melting range	1370‑1400 ℃
Microstructure	Austenitic, non‑magnetic (weak magnetism after cold forming)
Max continuous service temperature	Up to 550 ℃

 

Key Characteristics Of 1.4404 / 316L Stainless Steel

What are the welding performance advantages of 1.4404 stainless steel?
It features superior weldability and avoids welding sensitization issues. Its ultra-low carbon content (≤0.03%) greatly inhibits chromium carbide precipitation during welding, effectively preventing intergranular corrosion in the heat-affected zone. No post-weld heat treatment is required, simplifying processing and ensuring stable corrosion resistance after welding.

 

How does 1.4404 corrosion resistance perform in chloride environments?

1.4404 has excellent resistance to local corrosion. The addition of 2-2.5% molybdenum element significantly enhances its resistance to pitting corrosion and crevice corrosion.1.4404 chloride corrosion resistance is far superior to conventional 304 and 304L stainless steel, adapting to salty and humid corrosive environments.

 

Is 1.4404 material suitable for chemical acid working conditions?

Yes,1.4404 possesses reliable acid resistance.1.4404 delivers excellent anti-corrosion performance in sulfuric acid, phosphoric acid, acetic acid and other acidic media, fully meeting the service requirements of various chemical processing equipment and piping systems.

 

What about the mechanical flexibility and low-temperature performance of 1.4404?

1.4404 has outstanding formability and toughness.1.4404 retains the excellent ductility and impact resistance of austenitic stainless steel grades. Even under ultra-low cryogenic temperature conditions,1.4404 can maintain stable mechanical properties without brittle failure.

 

Applications Of 1.4404 / 316L Stainless Steel

1.Chemical & Pharmaceutical:

Tanks, reactors, piping, and vessels for corrosive media requiring high purity.

2.Marine & Coastal:

Boat fittings, offshore platforms, and components exposed to seawater or salt spray.

3.Medical & Food Processing:

Surgical instruments, implants, and equipment requiring sterilization and high cleanliness.

4.Architectural:

High-end façades, railings, and structures in polluted or coastal atmospheres.

5.Pulp & Paper:

Process equipment in bleaching and chemical recovery areas.

6.Textile Industry:

Equipment for dyeing and bleaching operations.

Supplier Introduction Of 1.4404 / 316L Stainless Steel

GNEE supplies a full range of export‑oriented 1.4404 (X2CrNiMo17‑12‑2 / 316L) austenitic stainless‑steel products in compliance with EN, DIN and ASTM standards. Bulk orders, small‑batch trial orders and sample delivery are all available.

Main export product categories include:

1.Sheets, Plates & Coils: Hot‑rolled / cold‑rolled sheets, medium‑thick plates, steel coils and slit strips. Surface finishes: 2B, NO.1 pickled, polished. Cut‑to‑size service is available.

2.Bars & Profiles: Hot‑rolled round bars, cold‑drawn bright bars, square bars, flat bars and hex bars, available in black, rough‑turned or polished surfaces.

3.Pipes & Tubes: Seamless tubes, welded tubes, polished tubes and pickled tubes for process piping and heat‑exchange service.

4.Forgings & Fittings: Forge

 

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FAQ

When should I choose 316L (1.4404) over 316 (1.4401)?
Choose 316L when the component will be heavily welded and cannot be post-weld heat treated, or when it will be used in the sensitization temperature range (450–850°C). This includes thick-section welds, multi-pass welds, or applications where the welded structure will be exposed to corrosive environments. 316L is also preferred for aggressive corrosive environments where maximum corrosion resistance is required, and for applications requiring approval from pressure vessel codes. For applications with minimal welding or where higher ambient strength at elevated temperatures is needed, standard 316 may be suitable and slightly more economical.

 

Does 316L have lower mechanical strength than 316 due to its lower carbon content?
In practice, the difference in room-temperature mechanical properties between annealed 316 and 316L is minimal and often within specification overlap. Both grades meet similar minimum strength requirements (200 MPa yield for 316L, 205 MPa for 316). The primary advantage of 316L is its corrosion resistance after welding or high-temperature exposure, not a reduction in ambient strength. At elevated temperatures (>500°C), 316 may have slightly higher creep strength due to its higher carbon content, which is why 316H (high-carbon) is specified for high-temperature service.

 

What are the welding considerations for 316L?
316L has excellent weldability using all common methods including TIG, MIG, SMAW, and SAW. Matching filler metals (ER316L for TIG/MIG, E316L-16 for SMAW) are recommended to maintain corrosion resistance. The low carbon content eliminates the need for post-weld heat treatment, even for thick sections. Recommended heat input is typically 0.5-2.0 kJ/mm, with interpass temperature below 150°C. Shielding gas (argon or argon with 2-5% nitrogen) protects the weld pool. Post-weld cleaning and pickling/passivation are recommended to restore the passive layer and ensure optimum corrosion resistance.