Designation by Standards
| Brand Name |
Ravne No. |
Mat. No. |
DIN |
EN |
AISI |
| PK4EX |
902 |
1.4034 |
X46Cr13 |
X45Cr13 |
420 |
Chemical Composition (in weight %)
| C |
Si |
Mn |
Cr |
Mo |
Ni |
V |
W |
Others |
| 0.47 |
max. 1.0 |
max. 1.0 |
13.50 |
- |
- |
- |
- |
- |
Description
Steel 420 displays the best corrosion resistance in hardened condition with a surface polished to give a mirror finisih.
Applications
All kinds of cutting tools - knives, shears, surgical instruments, moulds for plastics production, as well as for surgical instruments and measuring gauges.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [10
3 x N/mm
2]: 220
Density [g/cm
3]: 7.73
Thermal conductivity [W/m.K]: 30.0
Electric resistivity [Ohm mm
2/m]: 0.65
Specific heat capacity[J/g.K]: 0.46
Coefficient of Linear Thermal Expansion 10-6 oC-1
| 20-100oC |
20-200oC |
20-300oC |
20-400oC |
20-500oC |
| 10.5 |
11.0 |
11.0 |
11.5 |
12.0 |
Modulus of Elasticity [103 N/mm2]
| 20oC |
200oC |
400oC |
| 220 |
205 |
190 |
Continuous Cooling Transformation (CCT) Diagram
Click the image to enlarge the diagram.
Soft Annealing
Heat to 730-780
oC, cool slowly in furnace or air. Structure is ferrite with spherical carbides.
Hardening
Harden from a temperature of 980-1030
oC followed by oilor air quenching. Hardness after quenching is 56 HRC.
Tempering
Tempering temperature: 100-200
oC.
Tempering Temperature (oC) vs. Hardness (HRC)
| 20oC |
100oC |
200oC |
300oC |
400oC |
500oC |
600oC |
| 56 |
56 |
55 |
52 |
51 |
52 |
42 |
Tempering Diagram
Click the image to enlarge the diagram.
Forging
Hot forming temperature: 1100-800
oC.
Machinability
Similar to machining some of the high carbon tool steel, this alloy has tough, stringy chip build-up.
Corrosion Resistance
420 is resistant to the atmosphere, fresh water, dilute acids and alkalis and fruit and vegetable juices.
Welding
Not commonly welded due to its air hardening characteristics. Welding may be performed after preheating to 149-204
oC with post weld tempering at temperature for 2 hours . Filler metal should be AWS E/ER420.
Note: The hot forming temperature stated should not be exceeed, as harmful grain coarsening and simultaneous formation of a carbide network along the grain boundaries will otherwise occur. This results in poor developmnet of hardness and a decline in toughness and elasticity in hardened condition.
Forms manufactured: Please see the
Dimensional Sales Program.
Disclaimer
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.
Unless otherwise specified, registered trademarks are property of Metal Ravne company. Copyright 2011 by Metal Ravne. All rights reserved.
Contact our
Sales Office for more information.
