EN 1.4021 (X20Cr13) Stainless Steel | AISI 420| Chemical Composition, Equivalent Grade, Datasheets| Alokindia.com

1.4021 Stainless Steel

All You Need to Know About Martensitic Corrosion Resistant Stainless Steel X20CR13, 1.4021, S42000 According to EN 10088-1


What is 1.4021 (ASTM 420-SS2303) Stainless Steel Grade

The 1.4021-grade  (ASTM 420-SS2303)  stainless steel is martensitic, hardenable steel with high tensile strength and good corrosion resistance. It has been improved with the use of Sulphur. The martensitic stainless steel is created for thermal improvement and shows high mechanical properties such as strength, ductility, and machinability.


The 1.4021-grade (ASTM 420-SS2303) stainless steel has the following properties:

  1. High tensile strength
  2. Martensitic 

iii. Good corrosion resistance and other resistances


Why use EN 1.4021 (ASTM 420-SS2303) Stainless Steel

By using 1.4021 stainless steel, you get steel with good machinability. The stainless steel also shows good resistance to air, water steam, freshwater, certain alkaline solutions, and other mildly aggressive chemicals. 

But it is not suitable for chloride exposure or marine conditions.

The 1.4021 stainless steel is also weldable. It is easier to machine 1.4021 martensitic steel than conventional austenitic steel. The heat treatment condition of 1.4021 is QT 700 and it should be hot-formed in the temperature range 1100-800°C. The process is slow cooling after hot forming.


What is the chemical composition of 1.4021 stainless steel?

The chemical composition of 1.4021 stainless steel is:

1.4021 steel chemical element % present
Carbon (C) 0.16 to 0.25%
Manganese (Mn) ≤1.50%
Silicon (Si) ≤1.00%
Chromium (Cr) 12.00 to 14.00%
Nickel (Ni)
Molybdenum (Mo)
Phosphorus (P) <0.040%
Sulphur (S) ≤0.030%


How to work with 1.4021 steel

1.4021 steel hot work and heat treatment temperature
Forging °C Annealing °C Hardening °C Tempering °C
1100 to 800 750 to 820 950 to 1050 QT 700
Slow cooling Air Oil/Air 650-750 Air
QT 800
600-700 Air


1.4021 stainless steel applications

The main areas of applications of 1.4021 stainless steel include:

  1. Automatic screw machine parts
  2. Valve parts
  3. Piston rods
  4. Pump shafts
  5. Gears
  6. Studs
  7. Fittings
  8. Motor shafts
  9. Bolts 
  10. Nuts
  11. Stirrers
  12. Cutlery blades
  13. Washing machine parts
  14. Surgical instruments


Looking for steel grade 1.4021?

We offer 1.4021 steel grade as a machined round bar in the dimensions 16 – 160 mm.

Reach out to us if you want to know more about this specific steel grade or our other products.