PK4EX

   
Identification

 

Designation by Standards
Brand Name Ravne No. Mat. No. DIN EN AISI
PK4EX 902 1.4034 X46Cr13 X45Cr13 420

 

Chemical Composition

 

Chemical Composition in Weight %
C Si Mn Cr Mo Ni V W Others
0.47 max. 1.0 max. 1.0 13.50 - - - - -

 

General Information

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.

 

Properties

Physical properties (avarage values) at ambient temperature:
Modulus of elasticity [103 x N/mm2]: 220
Density [g/cm3]: 7.73
Thermal conductivity [W/m.K]: 30.0
Electric resistivity [Ohm mm2/m]: 0.65
Specific heat capacity[J/g.K]: 0.46

Coefficient of Linear Thermal Expansion 10-6 oC-1
20-100 'C 20-200 'C 20-300 'C 20-400 'C 20-500 'C
10.5 11.0 11.0 11.5 12.0

Modulus of Elasticity [103 N/mm2]
20 'C 200 'C 400 'C
220 205 190


 

Heat Treatment

Soft Annealing
Heat to 730-780 'C, cool slowly in furnace or air. Structure is ferrite with spherical carbides.

Hardening
Harden from a temperature of 980-1030 'C followed by oilor air quenching. Hardness after quenching is 56 HRC.

Tempering
Tempering temperature: 100-200 'C.

Tempering Temperature ( 'C) vs. Hardness (HRC)
20 'C 100 'C 200 'C 300 'C 400 'C 500 'C 600 'C
56 56 55 52 51 52 42

Effect of Tempering Temperature on Hardness

 

Workability


Forging
Hot forming temperature: 1100-800 'C.

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