Stainless Steel - Martensitic - 1.4021 (420) Bar

Stainless Steel - Martensitic - 1.4021 (420) Bar

Stainless Steel - Martensitic - 1.4021 (420) Bar A martensitic machining bar with machinability enhanced through the addition of Sulphur. As for most other free-machining stainless steels the improvement in machinability is achieved by addition of sulphur which forms manganese sulphide...
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Product Details

Stainless Steel - Martensitic - 1.4021 (420) Bar

A martensitic machining bar with machinability enhanced through the addition of Sulphur.

As for most other free-machining stainless steels the improvement in machinability is achieved by addition of sulphur which forms manganese sulphide inclusions; this sulphur addition also lowers the corrosion resistance, weldability and formability to below that of its non-free machining equivalent Grade 410.

Martensitic stainless steels are optimised for high hardness, and other properties are to some degree compromised. Fabrication must be by methods that allow for poor weldability and usually also allow for a final harden and temper heat treatment. Corrosion resistance is lower than the common austenitic grades, and their useful operating temperature range is limited by their loss of ductility at sub-zero temperatures and loss of strength by over-tempering at elevated temperatures.


Chemical Composition

Spec: EN 10088-3:2005  1.4021 Steel

Chemical Element% Present

Carbon (C)

0.16 - 0.25

Chromium (Cr)

12.00 - 14.00

Manganese (Mn)

1.50 max

Silicon (Si)

1.00 max

Phosphorous (P)

0.04 max

Sulphur (S)

0.03 max

Iron (Fe)

Balance


Physical PropertyValue

Density

7.75 g/cm³

Thermal Expansion

10.3 x10^-6 /K

Modulus of Elasticity

200 GPa

Thermal Conductivity

24.9 W/m.K

Electrical Resistivity

0.055 x10^-6 Ω .m


Spec: EN 10088-3:2005

Bar - Up to 160mm Dia / Thickness

Mechanical PropertyValue

Proof Stress

500 - 600 MPa

Tensile Strength

700 - 950 MPa

Elongation A

12 - 13 %


Alloy Designations

1.4021 is similar, but may not be a direct equivalent to:

420

UNS42000

1.4021, 1.4024, 1.4028, 1.4029, 1.4030, 1.4034


Supplied Forms

  • Bar


Applications

Typical applications include:

Valve Parts

Pump Shafts

Automatic Screw Machined Parts

Motor Shafts

Washing Machine Components

Bolts and Nuts

Studs

Gears

Shear Blades

Cutlery (Blades)

Surgical Instruments


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