Martensite 13% Cr, AISI 420A, DIN 1.4021 stainless steel strips in coils

W.-Nr. 1.4021 ( DIN X20Cr13 ) stainless steel is a martensitic stainless steel with 13% Chromium which is sufficient to give good corrosive resistance properties.

It’s best corrosive resistance is when hardened and surface is ground or polished.

It has good ductility in the annealed condition but can be hardened up to 500HB ( highest of the chromium grades ).

Designations

Chemical composition ( in weight % )

Applications

Dental and surgical instruments, cutlery, pump shafts, plastic molds and dies, steel balls, and various hand tools.

Machinability

Similar to machining some of the high carbon tool steel, this alloy has tough, stringy chip build-up.

Welding

Not commonly welded due to its air hardening characteristics.

Welding may be performed after preheating to 300-400°F (149-204°c) with post weld tempering at temperature for 2 hours. 

Filler metal should be AWS E/ER 420.

Hot working

Bring temperatures slowly up to 1400°F (760°c), then on to 2000-2200°F (1097-1204°c),

after working, furnace cool slowly to avoid cracking.

Reheat often to keep the working temperature above 1600°F.

Cold working 

420 will withstand only minor cold work. Radical forming operations will result in cracking.

Annealing 

1550-1650°F (843-900°c), slow furnace cooling.

Tempering 

300-400°F (149-204°c), air cool for maximum hardness and corrosion resistance.

Hardening 

Soak at 1850-1950°F (1010-1066°c) at quench in heated oil.

Physical data

Density (lb / cu. in.)   0.278

Specific Gravity  7.7

Specific Heat (Btu/lb/Deg °F - [32-212 Deg °F])  0.11

Electrical Resistivity (microhm-cm (at 68 Deg °F))  330

Melting Point (Deg °F)  2650

Modulus of Elasticity Tension  29 

We are looking forward to your enquiries.

Contact:LIU

Email: sales@ahoneststeel.com

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