DIN EN 1.4401 Material X5CrNiMo17-12-2 Stainless Steel

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DIN EN 1.4401 Material X5CrNiMo17-12-2 Stainless Steel

DIN EN 1.4401 material (X5CrNiMo17-12-2) is a molybdenum-containing austenitic stainless steel. Due to the chemical composition of molybdenum, its corrosion resistance is higher than 1.4301 (X5CrNi18-10), especially in environments containing chloride and non-oxidizing acids. 1.4404 (X2CrNiMo17-12-2) is an ultra-low carbon version of 1.4401 stainless steel, which has better corrosion resistance in welded structures.

Datasheet & Specification

The following tables and lists give the stainless steel 1.4401 datasheet including chemical composition, physical properties and mechanical properties, heat treatment, welding, etc.

Chemical Composition

DIN EN 1.4401 material chemical composition is listed in the following table based on cast analysis.

Chemical Composition, %
Steel Grade (Steel Number) Standard C, ≤ Si, ≤ Mn, ≤ P, ≤ S, ≤ Cr Ni Mo N, ≤
X5CrNiMo17-12-2 (1.4401) 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

Physical Properties

DIN 1.4401 material physical properties are given in the following lists, including density, thermal expansion, elastic modulus, thermal conductivity, specific heat capacity and electrical resistance.

Notes:

  • 10-6·K-1 = 10-6/K
  • 1 Ω·mm²/m = 1 μΩ·m
  • 1 g/cm3 = 1 kg/dm3 = 1000 kg/m3
  • 1 GPa = 1 kN/mm2
  • 1 MPa = 1 N/mm2
Physical Properties
Density, g/cm3 8,0
Magnetic No
Electrical resistivity, μΩ·m 0,75 (20 ℃)
Specific heat capacity, J/(kg·K) 500 (20 ℃)
Thermal conductivity, (W/m·K) 15,0 (20 ℃)
Modulus of elasticity, Gpa 200 (20 ℃)
194 (100 ℃)
186 (200 ℃)
179 (300 ℃)
172 (400 ℃)
165 (500 ℃)
Mean coefficient of thermal expansion, (10-6/K) 16,0 (20-100 ℃)
16,5 (20-200 ℃)
17,0 (20-300 ℃)
17,5 (20-400 ℃)
18,0 (20-500 ℃)

Mechanical Properties

Material 1.4401 stainless steel mechanical properties at room temperature in the solution-annealed condition and resistance to intergranular corrosion.

Mechanical properties (Solution annealed)
Country (Region) Standard Steel Grade (Steel Number) Diameter (d) or Thickness (t) in mm Hardness (HB), ≤ 0.2% yield strength (MPa), ≥ 1% yield strength (MPa), ≥ Tensile strength (MPa) Elongation, % (long.) Elongation, % (tr.) Impact energy, KV2, J (long.), ≥ Impact energy, KV2, J (tr.), ≥ Resistance to intergranular corrosion (In the delivery condition) Resistance to intergranular corrosion (In the sensitized condition)
European Union EN 10088-3 X5CrNiMo17-12-2 (1.4401) ≤160 215 200 235 500-700 40 100 Yes No
160<t≤250 30 60
Mechanical properties (Solution annealed)
Steel Grade (Steel Number) Product Condition Thickness (mm), ≤ 0,2 % yield strength (Mpa), ≥ 1% proof strength (MPa), ≥ Tensile strength (MPa) Elongation (%), ≥, (tr.) Impact energy, KV2, J (long.), ≥ Impact energy, KV2, J (tr.), ≥ Resistance to intergranular corrosion (In the delivery condition) Resistance to intergranular corrosion (In the sensitized condition)
X5CrNiMo17-12-2 (1.4401) cold rolled strip 8 240 270 530-680 40 Yes No
hot rolled strip 13,5 220 260 530-680 100 60
hot rolled plate 75 220 260 520-670 45

Minimum values for yield strength of 1.4401 steel at elevated temperatures.

Steel designation (Number) 0,2% proof strength, MPa, ≥ 1% proof strength, MPa, ≥ Temperature (°C) Heat treatment condition
X5CrNiMo17-12-2 (1.4401) 175 210 100 +AT (solution annealed)
158 190 150
145 175 200
135 165 250
127 155 300
120 150 350
115 145 400
112 141 450
110 139 500
108 137 550

1.4401 Material Heat Treatment

The following is material 1.4401 stainless steel heat treatment, such as hot forming, solution annealing.

For solution annealing of 1.4401 material, if the heat treatment is performed in a continuous furnace, it’s usually preferable to specify an upper limit of the temperature range or even exceed it, and cooling should be sufficiently rapidly to avoid precipitation.

Hot forming Solution annealing
Standard Designation (Steel number) Temperature, ℃ Type of cooling Temperature, ℃ Type of cooling
DIN EN 10088-2 X5CrNiMo17-12-2 (1.4401) 1150 to 850 air 1030 to 1110 water, air
DIN EN 10088-3 1200 to 900 1020 to 1120

Forging

The workpiece of 1.4401 steel is usually preheated to a temperature between 1150 °C and 1180 °C. Forging is performed between 1180 °C and 950 °C. After forging, the workpiece must be quickly cooled in air or water to avoid the formation of undesirable phases that reduce mechanical properties. Discoloration or scale can reduce corrosion resistance and must be removed by pickling or other suitable processes.

Welding

DIN EN 1.4401 material has good weldability, with or without filler metal. If filler metal is needed, 1.4430 can be used, and the maximum interpass temperature is 150 °C. Due to the high carbon content, it is possible to form chromium carbide, thereby reducing resistance to intergranular corrosion, and post-weld heat treatment may be required. If larger areas must be welded, 1.4404 (X2CrNiMo17-12-2) is recommended.

Machinability

Since 1.4401 stainless steel has a higher carbon content than 1.4404, machinability is reduced.

Corrosion Resistance

PREN = 23.1 – 28.5, since the steel contains 2-2.5% molybdenum, the resistance to pitting and chloride corrosion is improved, and the corrosion resistance of 1.4401 is significantly better than that of stainless steel 1.4301 and 1.4307.

Use & Application

Chemical and pulp industry, paint, petroleum, soap and textile industry, dairy products, brewery parts and instruments.

1.4401 Stainless Steel Equivalent

Material X5CrNiMo17-12-2, DIN 1.4401 stainless steel equivalent to US ASTM AISI SAE, ISO, European (German DIN, British BSI, France NF), Japanese JIS and Chinese GB standard (for reference).

EN X5CrNiMo17-12-2 (1.4401) material equivalent
European Union US ISO China Japan
Standard Steel Name (Material Number) Standard Grade (UNS) Standard Grade (ISO number ) Standard Grade (UNS) Standard Grade
EN 10088-2;
EN 10088-3
X5CrNiMo17-12-2 (1.4401) AISI;
ASTM A240/A240M;
ASTM A276/A276M;
AISI 316 (UNS S31600) ISO 15510 X5CrNiMo17-12-2 (4401-316-00-I) GB/T 1220;
GB/T 3280
0Cr17Ni12Mo2;
06Cr17Ni12Mo2 (new designation) (S31608)
JIS G4303;
JIS G4304;
JIS G4305
SUS316

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