1.4021
Data sheet material 1.4021 / AISI 420
X20Cr13
Martensitic corrosion-resistant stainless steel
Brief description
The material 1.4021 or AISI 420 has good corrosion resistance due to its high chromium content. Due to its high polishability, it is often used in the manufacture of cutting tools and other household and kitchen items as well as for decorative purposes.
Standards and nomenclature
| EN | |
|---|---|
| DIN | X20Cr13 |
| AISI | 420 |
| US | S42000 |
| EN | |
|---|---|
| DIN | X20Cr13 |
| AISI | 420 |
| US | S42000 |
Chemical composition
| C (carbon) | 0,16 | 0,25 |
| Mn (manganese) | - | 1,5 |
| Si (silicon) | - | 1,0 |
| P (phosphorus) | - | 0,040 |
| S (sulphur) | - | 0,030 |
| Cr (chromium) | 12,0 | 14,0 |
| Ni (nickel) | - | - |
| N (nitrogen) | - | - |
-
-
min.
max.
C
(carbon)
0,16
0,25
Mn
(Manganese)
-
1,5
Si
(Silicon)
-
1,0
P
(phosphorus)
-
0,040
S
(sulphur)
-
0,030
Cr
(chrome)
12,0
14,0
Ni
(nickel)
-
-
N
(Nitrogen)
-
-
General
Properties
| Corrosion resistance | |
|---|---|
| Mechanical properties | very good |
| Forgeability | good |
| Weldability | good |
| Machinability | good |
Special
Properties
High-gloss polishable
Can be used up to 400°C
Corrosion
Consistency
Adequate corrosion resistance is given in moderately aggressive, chloride-free media. The material 1.4021 is not resistant to intergranular corrosion. Furthermore, this material grade is scale resistant up to 600°C. (PREN = 12.0 - 14.0)
Mechanical properties
at 20°C
Hardness
HB
≤ 230
Yield point
Rp0,2
N / mm²
≥ 460
Tensile strength
Rm
N / mm²
750 - 850
Elongation
A5,65
≥ 12%
Modulus of elasticity
kN / mm²
215
Forgeability
The forging process initially involves slow heating to over 850°C. This is followed by faster heating to temperatures of 1150°C - 1180°C in order to forge in a temperature range of 1100°C - 950°C. This is followed by slow cooling in the furnace.
Weldability
This material can be welded using standard welding processes - with the exception of arc welding. The material must be heated to 100°C - 300°C before welding. Gases containing hydrogen or nitrogen should be avoided as they have a negative effect on the mechanical properties.
Machinability
The machinability depends on the hardness and strength and is similar to the known structural steels in terms of machining.
Markets & Applications
Automotive industry
Chemical and petrochemical industry
Decorative applications
Food industry
Mechanical engineering
Medical technology, pharmacy
Cutlery industry
Physical properties
at 20°C
Density
kg/dm³
7,7
Electrical
Resistance
(ohm) mm²/m
0,60
Magnetisability
available
Thermal conductivity
W/m K
30
Specific
Heat capacity
J/kg K
460
Processing
| Cold forming | |
|---|---|
| Cold heading | not usual |
| Polishability | Yes |
| Open-die and closed-die forging | Yes |
| Machining | Yes |
Thermal treatment
| Soft annealing (+A) | |
|---|---|
| Hardening (+QT) | 950 - 1050°C (cooling: oil, polymer, air) |
| Starting (+QT700) | 650 - 750°C (cooling: oil, polymer, air) |
| Starting (+QT800) | 600 - 700°C (cooling: oil, polymer, air) |
| Hot forming | 800 - 1100°C (cooling: oil, polymer, air) |
| Soft annealing (+A) | |
|---|---|
| Hardening (+QT) | 950 - 1050°C (cooling: oil, polymer, air) |
| Starting (+QT700) | 650 - 750°C (cooling: oil, polymer, air) |
| Starting (+QT800) | 600 - 700°C (cooling: oil, polymer, air) |
| Hot forming | 800 - 1100°C (cooling: oil, polymer, air) |
Frequently asked questions
Important note
TEAM EDELSTAHL operates purely as a trading company without technical staff. As a result, we cannot and must not provide materials consulting.
The above values and information on the properties and/or usability of the material are purely informative. This information is based on the experience of the manufacturer and TEAM EDELSTAHL. All information is without guarantee. Misprints, errors and changes excepted.
