Acidur 4542 P800 Bar

Alternative and trade names
Acidur 4542, 1.4542, Type 630, SUS 630


Acidur 4542 (1.4542) is a hardenable stainless steel with high yield strength, high wear resistance and good corrosion resistance. As a remelted variant (ESU/VU) this steel is used in the aerospace industry. It is suitable for low temperatures and can be used up to approx. 315°C

Related Standards

Equivalent Materials



Density ρ

7.8 g/cm³ at 20 °C


Diameter d

100 mm



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

75 J at 20 °C

Elastic modulus E

200 GPa at 20 °C

Show chart

Elongation A5 A5

18 % at 20 °C

Hardness, Brinell HB

360 [-] at 20 °C


Tensile strength Rm

800 - 950 MPa at 20 °C

Yield strength Rp0.2 Rp0.2

520 MPa at 20 °C

Show chart


Coefficient of thermal expansion α

1.09E-5 1/K at 100 °C

for 20°C to the mentioned temperature

Show chart

Specific heat capacity cp

500 J/(kg·K) at 20 °C

Thermal conductivity λ

16 W/(m·K) at 20 °C


Electrical resistivity ρel

7.1E-7 Ω·m at 20 °C

Chemical properties


Weight %






15 - 17 %


3 - 5 %


3 - 5 %


1 %


Technological properties

Application areas

Aerospace, Plant engineering and construction, Chemical industry, Wood industry, Mechanical engineering, Oil industry, Paper industry, Sports and leisure industry, Ship building

Corrosion properties

The good combination of high corrosion resistance and good mechanical properties makes Acidur 4542 suitable for use in marine environments. In standing seawater, however, Acidur 4542 is susceptible to crevice corrosion. If application in standing seawater cannot be excluded, additional protection (e.g. painting) must be applied.

General machinability

Acidur 4542 can be machined in both the solution annealed and hardened condition. The machinability of Acidur 4542 depends on the hardness

Heat Treatment

Hardening:1030-1055°C in oil, air - Percipitation hardening: 2 hr 760°C in air / 4 hr 620°C in air

Hot forming

It is formable at 900-1150°C

Processing history

Percipitation hardened P800


To weld Acidur 4542, the condition of the base material must be taken into account. The copper is present in the material in a stable form and therefore does not promote hot cracking. In addition to setting optimum welding conditions, care must be taken to avoid undercuts or other welding defects that lead to the formation of a notch. After welding, the material must be solution annealed again within a very short time with subsequent ageing to prevent stress cracking.

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.