The material: 'Acidur 4541' you were looking for has been superseded by the one below.

Acidur 4541 +AT Bar

Alternative and trade names
Acidur 4541, 1.4541, Type 321, Type 321H, SUS321, 08X18H10T, 12X18H10T, X6CrNiTi18-10


With Acidur 4541, the carbon is bound to the Carbide forming titanium. Therefore, this steel can be welded regardless of its thickness without the risk of intergranular corrosion. A post heat treatment is not necessary. Acidur 4541 shows high corrosion resistance and good cold formability. Due to this properties, this grade is widely used for welded parts in chemical apparatus engineering and used in the food industry. Beyond that, is Acidur 4541 according to the Pressure Equipment Directive 97/23 EG approved by up to 40°C.

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

40 % at 20 °C

Elongation A5, transverse A5,trans

30 % at 20 °C

Hardness, Brinell HB

215 [-] at 20 °C

Hardness, Rockwell C HRC

22 [-] 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 - 19 %


9 - 12 %


2 %


1 %


Technological properties

Application areas

Automotive industry, Building and construction industry, Chemical industry, Food and beverage industry, Aviation and aerospace, Mechanical engineering

Corrosion properties

Good - 1.4541 displays excellent resistance to corrosion in most natural waters (rural and industrial), provided the chloride, salt and concentrations of hydrochloric and organic acids are low. Since this grade of stainless steel is still resistant to intergranular corrosion after welding, i.e. in the sensitised condition, corrosion testing in accordance with the following corrosion testing specifications, are sufficient to establish resistance to corrosion: AFNOR NF 05-159, ASTM A262-75. Practice E, DIN EN ISO 3651-2. (PREN = 17.0 – 19.0)

General machinability

Poor - The formation of titanium carbo-nitrides in 1.4541 alters the machinability of this stainless steel compared with the low carbon, titanium free variants, like 1.4307.

Heat Treatment

Solution annealing: 1020-1120°C (water, air) fast cooling

Hot forming

It is formable at 900-1200°C

Processing history

Solution Annealed


Excellent - 1.4541 is weldable with all processes, except gas welding, either with or without the use of filler material. If the use of a filler metal is required, then the use of Novonit 4316 or 4551 would be recommended. Post weld heat treatment is not necessary. Maximum inter-pass temperature 200°C. Any heat tint that forms must be removed by pickling or suitable mechanical process followed by passivating to restore corrosion resistance.

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.