Acidur 4401 +AT Bar

Alternative and trade names
Acidur 4401, 1.4301, Type 304, F304, SUS304, X5CrNi18-10


1.4301 is the standard for the austenitic grades of stainless steel due to its good corrosion resistance, ease of formability and fabrication coupled with its aesthetic appearance in the polished, ground and brushed conditions. Since 1.4301 is not resistant to intergranular corrosion in the welded condition, 1.4307 should rather be specified if welding of larger sections is required and no solution annealing treatment after welding can be performed. Surface condition plays an important role in the corrosion resistance of this steel with polished surfaces exhibiting far superior corrosion resistance compared with rougher surfaces on the same material.

Related Standards

Equivalent Materials



Density ρ

7.9 g/cm³ at 20 °C


Diameter d

250 mm



Charpy impact energy, V-notch aK,charpy,V-notch

100 J at 20 °C

Elastic modulus E

200 GPa at 20 °C

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Elongation A5 A5

45 % at 20 °C

Elongation A5, transverse A5,trans

35 % at 20 °C

Hardness, Brinell HB

215 [-] at 20 °C

Tensile strength Rm

500 - 700 MPa at 20 °C

Yield strength Rp0.2 Rp0.2

190 MPa at 20 °C

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Yield strength Rp1.0 Rp1.0

225 MPa at 23 °C

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Coefficient of thermal expansion α

1.6E-5 1/K at 100 °C

for 20°C to the mentioned temperature

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Specific heat capacity cp

500 J/(kg·K) at 20 °C

Thermal conductivity λ

15 W/(m·K) at 20 °C


Electrical resistivity ρel

7.3E-7 Ω·m at 20 °C

Chemical properties


Weight %






17.5 - 19.5 %


8 - 10.5 %


2 %


1 %


Technological properties

Application areas

Automotive industry, Building and Construction industry, Chemical industry, Food and Beverage industry, Decorative items and Kitchen Utensils, Electronic Equipment, Petrochemical industry

Corrosion properties

Good - Due to the moderate carbon content of 1.4301, this grade of stainless steel is prone to sensitisation. The formation of chromium carbides and the associated chromium depleted regions that form around these precipitates make this grade of steel susceptible to intergranular corrosion. Although no danger of intergranular corrosion exists in the supplied (solution annealed) condition, intergranular corrosion may occur after welding or high temperature processing. 1.4301 is resistant to corrosion in most environments provided the chloride and salt concentrations are low. 1.4301 is not recommended for applications where it comes into contact with sea water, nor is it recommended for use in swimming pools. PRE = 17.5 – 21.36

General machinability

Average - For applications which require machining, the NIRO-CUT® 4301 grade is recommended since the composition and production route followed to produce this grade compensates for the work hardening tendency of the material.

Heat Treatment

Optimal material properties are realised after solution annealing in the temperature range 1000 °C – 1100 °C followed by rapid cooling in air or water. Since this grade of steel is susceptible to precipitation of chromium carbides, care must be taken to limit the time spent in the temperature range 450 °C to 850 °C, both during fabrication and service.

Hot forming

It is formable at 900-1200°C

Processing history

Solution Annealed


Excellent - 1.4301 is weldable with or without the use of filler material. If the use of a filler metal is required, then the use of Novonit® 4316 (AISI 308L) would be recommended. Maximum interpass temperature 200 °C. Post weld heat treatment is not necessary.

This material data has been provided by Deutsche Edelstahlwerke Specialty Steel (DEW).

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.