Acidur 4122 QT750

Alternative and trade names
Acidur 4122
Want to keep this datasheet? Save it now in your required format

Description

1.4122 (X39CrMo17-1) is characterised by its combination of outstanding mechanical properties, (after heat treatment) and a corrosion resistance which is comparable with that of 1.4016. This steel can also be polished to high gloss finishes.

Related Standards

Equivalent Materials

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.

Ashby charts

Properties

General

PropertyValue

Density

7.7 g/cm³

Show Supplier Material materials with Density of 7.7 g/cm³

Mechanical

PropertyValueComment

Charpy impact energy, V-notch

14.0 J

Show Supplier Material materials with Charpy impact energy, V-notch of 14.0 J

Hardness, Brinell

280.0

Show Supplier Material materials with Hardness, Brinell of 280.0

annealed

Tensile strength

750.0 - 950.0 MPa

Show Supplier Material materials with Tensile strength of 750.0 - 950.0 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100 °C

0.0000104 1/K

Show Supplier Material materials with Coefficient of thermal expansion of 0.0000104 1/K

for 20°C to the mentioned temperature

200 °C

0.0000108 1/K

Show Supplier Material materials with Coefficient of thermal expansion of 0.0000108 1/K

for 20°C to the mentioned temperature

300 °C

0.0000112 1/K

Show Supplier Material materials with Coefficient of thermal expansion of 0.0000112 1/K

for 20°C to the mentioned temperature

400 °C

0.0000116 1/K

Show Supplier Material materials with Coefficient of thermal expansion of 0.0000116 1/K

for 20°C to the mentioned temperature

Specific heat capacity

430.0 J/(kg·K)

Show Supplier Material materials with Specific heat capacity of 430.0 J/(kg·K)

Thermal conductivity

29 W/(m·K)

Show Supplier Material materials with Thermal conductivity of 29 W/(m·K)

Electrical

PropertyValue

Electrical resistivity

6.5e-07 Ω·m

Show Supplier Material materials with Electrical resistivity of 6.5e-07 Ω·m

Chemical properties

PropertyValue

Carbon

0.33 - 0.45 %

Show Supplier Material materials with Carbon of 0.33 - 0.45 %

Chromium

15.5 - 17.5 %

Show Supplier Material materials with Chromium of 15.5 - 17.5 %

Manganese

1.5

Show Supplier Material materials with Manganese of 1.5

Molybdenum

0.8 - 1.3 %

Show Supplier Material materials with Molybdenum of 0.8 - 1.3 %

Nickel

1.0

Show Supplier Material materials with Nickel of 1.0

Phosphorus

0.04

Show Supplier Material materials with Phosphorus of 0.04

Silicon

1.0

Show Supplier Material materials with Silicon of 1.0

Sulfur

0.03

Show Supplier Material materials with Sulfur of 0.03

Technological properties

Property
Application areas

Automotive industry, Pump shafts, Food and Beverage industry, Mechanical engineering, Cutting Tools, Building industry

Corrosion properties

Good - As a result of its higher chromium content, 17 %, 1.4122 is more corrosion resistant than 1.4006 and other 13 % chromium stainless steels. Good corrosion resistance is displayed in moderately corrosive media/environments with low chloride ion concentrations. Although the addition of molybdenum increases the resistance of this steel to chloride containing environments, it is not suited for use in sea water applications unless it is provided with cathodic protection. Optimal corrosion resistance is attained when the surface is finely ground or polished. PRE = 18.47 – 20.46

General machinability

With Care - The machinability of this grade of stainless steel is directly related to its hardness and as such the optimal machining parameters vary considerably. Once the hardness is known, the machining parameters can be estimated since 1.4122 machines similar to carbon steels of the same hardness. Although it must be realised that the machining parameters will vary depending on the structure/hardness of the steel.

Heat Treatment

1.4122 can be soft annealed by holding at a temperature in the range 750 °C to 850 °C followed by slow cooling in air or in a furnace. 1.4122 can be hardened by holding at a temperature between 980 °C – 1060°C followed by cooling in oil or polymer. The tempering temperature is dependent on the desired strength. The heat treated condition usually specified is the QT750 condition and is obtained by tempering in the temperature range 650 °C to 750 °C.

Processing history

Quenched and tempered QT 750

Welding

With Care - This grade of steel is not usually welded, but if absolutely no alternative exists, then the workpiece is to be pre-heated to a temperature within the range 300 °C – 400 °C prior to welding. Since a large amount of untempered martensite will form in the heat affected zone, a subsequent tempering treatment will be required. Since this tempering treatment will over temper the already tempered martensite in the rest of the work piece, it would be preferable if the entire component were hardened and tempered, as described above. Once again, the time lapse between welding and heat treatment must be as short as possible to reduce the possibility of cracking. When the application of a filler metal is required, then Novonit® 4576 can be used.