NZ3, 1.2550, 60WCrV8, NZ2, 1.2542, 45WCrV7, AISI S1 - cold-working tool steel according to PN-H-85023, GOST 5950 and ISO 4957.

Standards Steel Grade
Chemical Composition %
C: Si: Mn: P: S: Cr: V: W: Mo: Cu: Ni:
ISO 1.2550 - 60WCrV8
0.55-0.65 0.7-1.0 0.15-0.45 <0.030 <0.030 0.9-1.2 0.1-0.2 1.7-2.2 - - -
ISO 1.2542 - 45WCrV7
0.4-0.5 0.8-1.1 0.2-0.4 <0.035 <0.035 0.9-1.2 0.15-0.20 1.8-2.1 - - -
PN NZ2
0.4-0.5 0.8-1.0 0.2-0.4 <0.030 <0.030 0.9-1.2 0.15-0.30 1.7-2.0 - - -
PN NZ3
0.5-0.6 0.8-1.1 0.15-0.45 <0.030 <0.030 0.9-1.2 0.15-0.30 1.7-2.1 - - -
GOST 6ChV2S - 6XB2C
0.55-0.65 0.5-0.8 0.15-0.45 <0.030 <0.030 1.0-1.3 - 2.2-2.7 <0.3 <0.3 <0.4
GOST 5ChV2S - 5XB2C
0.45-0.55 0.8-1.1 0.15-0.45 <0.030 <0.030 0.9-1.2 <0.3 1.8-2.3 <0.3 <0.3 <0.35
NF 55WC20
0.55-0.65 0.7-1.0 0.15-0.45 <0.030 <0.030 0.9-1.2 0.1-0.2 1.7-2.2 - - -
ČSN 19733
0.52-0.62 0.8-1.2 0.15-0.40 <0.030 <0.035 0.9-1.2 - 1.7-2.2 - - -
ČSN 19735
0.55-0.65 0.45-0.75 0.15-0.40 <0.030 <0.030 0.9-1.2 - 1.8-2.3 - - -
UNS T41901 - AISI S1
0.40-0.55 0.15-1.20 0.1-0.4 <0.030 <0.030 1.0-1.8 0.15-0.30 1.5-3.0 <0.5 - -
MSZ W6
0.5-0.6 0.8-1.1 0.15-0.40 <0.030 <0.030 0.9-1.2 0.15-0.30 1.8-2.2 <0.2 <0.3 <0.35
UNI 55WCrV8KU
0.5-0.6 0.8-1.1 0.15-0.45 - - 0.9-1.2 0.1-0.3 1.7-2.3 - - -

NZ3, NZ2, 1.2550, 1.2542 – description

High quality steel, used for the manufacture of both cold and hot work tools that are exposed to high pressures, impacts and shocks. Blades made of this steel are very durable. It has great hardening capacity and it is very suitable for heat treatment, for example it is resistant to tempering and does not deform nor crack during quenching. 45WCrV7, 1.2542 is a steel grade with the same content of alloy additives but reduced carbon content into 0,45% range.

It contains chromium, silicon, vanadium and tungsten, but contains less carbon than other tool steels. As a result, we achieve lower brittleness, higher ductility, impact resistance, not to mention the possibility of working at high temperatures. The steel is not corrosion resistant and should not be used in caustic environments.

Main features:

  • Large hardening capacity
  • Very ductile
  • Impact resistant
  • Machinable
  • Quite hard

Applications

This alloy is widely used for:

  • Pneumatic chisels
  • Punchers
  • Cutters
  • Gauges
  • Die nuts

Physical and mechanical properties

Hardness is one of the most important parameter of this steel.

Norm Grade Max HB hardness as soft annealed Max HB hardness as quenched
PN NZ2 229 54*
PN NZ3 255 57
GOST 6ChV2S 255 -
ISO 1.2542 230 56
ISO 1.2550 249 -

* 56 HRC when quenched in water.

Mechanical properties of equivalent 6ChV2S steel in given temperature:

Properties Temperature
20℃ 300℃ 400℃ 450℃
Yield Strength: 1680 MPa 1410MPa 1250 MPa 1080 MPa
Tensile Strength: 1770 MPa 1630 MPa 1390 MPa 1230 MPa
Elongation: 7% 8% 11% 13%
Reduction of area: 18% 10% 48% 53%
Impact Value KCU: 26 J/m2 27 J/m2 24 J/m2 23 J/m2

Heat treatment and plastic working

Following parameters are recommended for working and heat treatment

Heat treatment and forging
Process Temperature
  NZ2 NZ3 19733 6ChV2S
Forging 1050-850℃ 1050-850℃ 1050-850℃ -
Soft annealing 710-740℃ 710-740℃ 720-750℃ -
Water quenching 860-890℃ - - -
Oil quenching 880-910℃ 850-880℃ 870-920℃ 840-900℃
Tempering 200-320℃ 220-320℃ - -

The final tool hardness is strongly affected by the tempering temperature. Let's see how it goes for 1.2542, NZ2 and NZ3:

Grade: Tempering temperature:
100℃ 200℃ 300℃ 400℃
NZ2 (oil) 58 HRC 57 HRC 55 HRC 52 HRC
NZ3 (oil) 59 HRC 58 HRC 56 HRC 53 HRC
1.2542 (oil) 57 HRC 57 HRC 56 HRC 53 HRC
1.2542 (water) 62 HRC 61 HRC 58 HRC 52 HRC

Welding

Welding as well as surfacing weaken the tool. Only repair welding and surfacing should be considered.


We deliver this steel alloy as:


Replacements, equivalents and other designations:

NZ2, NZ3, K455, 5ChV2S, 6ChV2S, CSN19733, CSN19735, 6ХВ2С, 5ХВ2С, 55WCrV8, 1.2542, 45WCrV7, 60WCrV7, S1, W6, 60WCrV8, 55WCrV8KU, AISI S1, T41901, LSH, M.E.P 2, Marker 220M, NR40/H, PS 505, Prewesta 1, SCW20H, Sp DN/h, TENAX H, UHB REGIN 3, UY03, WKS, Wst. 2550, 55WC20


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