W.NR. 1.2344ESR

Main characteristics and applications

High wear resistance hot-working steel, also be used for wear resistance and polished plastic moulds.
Steel is easy to machine in the annealed condition and needs a hardening process before final machining.
This steel also shows excellent toughness and high level insensitivity to thermal shock and thermal fatigue. A nitriding surface treatment can be carried out to increase the life of the tooling.

Main applications:
• dies for the pressure casting of light alloys.
• wear resistance plastic moulds.
• tooling for the extrusion of light alloys and steels.
• hot work shear blades.
• rolls for profiling tools (welding area).
• Forging dies.

Hot working tools should be preheated to temperatures in the range 250 – 300°C before use.

Comparable standards

(X40CrMoV51.1KU)W.NR. 1.2344X40CrMoV5-1-(H13)(BH13)

Chemical composition (typical; in weight %)


Critical points

Ac1 860 °C

Ac3 940 °C

Ms 340 °C

Production technology

Electro-slag-remelting (ESR) - Forging – Heat treatment +EFS

US specification

In according to standard EN10228-3 Class 4 and standard SEP 1921 Class E/e

Delivery condition

WW.NR. 1.2344 is delivered in annealed condition (EFS), with hardness max 230 HB (21 HRC)

Physical properties (reference values)

Thermal expansion coefficient (10-6/K)11.311.61213
Thermal conductivity (W/mk)18.81922.925.1
Young modulus (Kn/mm2)212209197175

Heat treatment

AnnealingHeat to 850 °CMin. H.T. for 2 minute /mmFurnace up to 550°C than in air-
Stress relievingHeat to 650-700°CMin. H.T. for 2 minute /mmfurnace up to 300-350°CTo be carried out after machining, is recommended to eliminate the residual stresses induced by mechanical working
HardeningPreheating to 350-400°C Second preheating to 750-850°C Heat to hardening temperature to 1000-1020°CMin. H.T. for 1 minute /mmAir or pressure gas by vacuumQuenched hardness 52-56HRC
TemperingIn the range 550 – 600°C for at least 3 h according to hardness requirements and conditions of use. Tempering must be repeated a second time at a temperature equal to or 20°C lower than the previous. Before tempering, the parts must be preheated to 200 – 300°CAirUsual service hardness: 44-52 HRC

C.C.T. curve


Tempering curve



Tool and Die Steel Includes Cold Work Steel, Hot Work Steel, Plastic Mould Steel, High Speed Steel. These tool materials adhere to great quality demands of steel like temper, strength, toughness, resistance to tempering, hardening capacity, dimensional stability etc. The range of Tool Steel in our store includes products from renowned manufacturers.