What is the Equivalent of 1.4401 ?

What is DIN EN 1.4401 (X5CrNiMo17-12-2) Stainless Steel?

DIN EN 1.4401, also known as X5CrNiMo17-12-2, is a molybdenum-alloyed austenitic stainless steel. Due to the presence of molybdenum in its chemical composition, it offers significantly better corrosion resistance than 1.4301 (X5CrNi18-10), especially in chloride-containing and non-oxidizing acid environments.1.4404 (X2CrNiMo17-12-2) is the low-carbon variant of 1.4401, offering improved weld corrosion resistance in structural applications.

EN 1.4401 Equivalent Materials

Standard	Equivalent Grade
USA (ASTM/UNS)	AISI 316 / UNS S31600
ISO	X5CrNiMo17-12-2 (4401-316-00-I)
China	0Cr17Ni12Mo2, 06Cr17Ni12Mo2
Japan	SUS316

 

EN 1.4401 Chemical Composition

Material Number	Standard	C (max)	Si (max)	Mn (max)	P (max)	S (max)	Cr (%)	Ni (%)	Mo (%)	N (max)
1.4401 (X5CrNiMo17-12-2)	EN 10088-2; EN 10088-3	0.07	1.00	2.00	0.045	0.030	16.5–18.5	10.0–13.0	2.00–2.50	0.10

 

EN 1.4401 Physical Properties

Density: 8.0 g/cm³

Magnetism: Non-magnetic

Electrical Resistivity: 0.75 μΩ·m (at 20°C)

Specific Heat Capacity: 500 J/(kg·K) (at 20°C)

Thermal Conductivity: 15.0 W/m·K (at 20°C)

Modulus of Elasticity:

20°C: 200 GPa

100°C: 194 GPa

200°C: 186 GPa

300°C: 179 GPa

400°C: 172 GPa

500°C: 165 GPa

EN 1.4401 Thermal Expansion Coefficient:

20–100°C: 16.0 × 10⁻⁶/K

20–200°C: 16.5 × 10⁻⁶/K

20–300°C: 17.0 × 10⁻⁶/K

20–400°C: 17.5 × 10⁻⁶/K

20–500°C: 18.0 × 10⁻⁶/K

 

EN 1.4401 Mechanical Properties (Solution Annealed Condition)

Tensile Strength: 500–700 MPa

0.2% Proof Strength: ≥200 MPa

1% Proof Strength: ≥235 MPa

Elongation: ≥40%

Impact Toughness (Longitudinal): ≥100 J

 

EN 1.4401 High Temperature Mechanical Properties

Temperature (°C)	0.2% Proof Strength (MPa)	1% Proof Strength (MPa)
100	175	210
150	158	190
200	145	175
250	135	165
300	127	155
350	120	150
400	115	145
450	112	141
500	110	139
550	108	137

 

EN 1.4401 Heat Treatment

Solution Annealing: 1030–1110°C, followed by rapid air or water cooling

Hot Working: 1150–850°C, air cooling

 

EN 1.4401 Forging

Preheating Temperature: 1150–1180°C

Forging Range: 1180–950°C

Post-Forging Cooling: Rapid cooling in air or water is essential to avoid the formation of detrimental phases that reduce mechanical properties.

Descaling: Any surface scale or decarburization should be removed via pickling or suitable descaling techniques to maintain corrosion resistance.

 

EN 1.4401 Weldability

Excellent weldability with or without filler metal.

Recommended filler metal: 1.4430

Max interpass temperature: 150°C

Due to its higher carbon content, chromium carbide formation may occur during welding, which can reduce intergranular corrosion resistance.

Post-weld heat treatment may be needed depending on the application.

For extensive welded structures, 1.4404 is preferred due to its superior resistance to weld-related corrosion.

 

EN 1.4401 Machinability

Due to its higher carbon content compared to 1.4404, machinability is slightly reduced.

 

EN 1.4401 Corrosion Resistance

PREN (Pitting Resistance Equivalent Number): 23.1–28.5

The presence of 2.0–2.5% molybdenum significantly enhances resistance to pitting and chloride corrosion, making 1.4401 clearly superior to 1.4301 and 1.4307 in aggressive environments.

 

EN 1.4401  Applications

Used in industries and components requiring enhanced corrosion resistance:

Chemical and pulp industry

Paint and coatings production

Oil, soap, and textile sectors

Dairy equipment

Brewery components and instrumentation

 

If you have project needs for 1.4401 or 1.4404 stainless steel bars, please feel free to place an order. GNEE has a large inventory of popular products for your selection. They can be processed into various practical product forms, including plates, coils, pipes, bars, and wires. For detailed chemical composition and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: sales@gneestainless.com