Steel 1.2343 - USN

1.2343 - USN:
high temperature strength and toughness.

What?

1.2343 – USN steel is a Cr-Mo-V alloyed hot-work tool steel with good high temperature strength characteristics and high-temperature toughness. USN is thermal shock resistant, water coolable, and is characterised by high hardenability.

Material properties

Properties of steel type 1.2343 – USN

High temperature strength .
High-temperature toughness.
Thermal shock resistant .
Watercooling possible.
Characterised by high hardenability.

Application

The most common applications for steel type 1.2343 – USN are:

Extrusion press tools for light metal processing, such as dies, chamber tools, die holders, press mandrels, press stems, container mantles, inner liners.
Press mandrels and stems for steel and heavy metal processing in extrusion presses.
Die casting tools such as moulding plates, valves, cores, ejectors, sprue bushings and filling fittings in the processing of light metals and zinc alloys.
Tools in forging machines such as pressure dies, die inserts, stamps and mandrels for steel, heavy and light metals.

Physical properties of 1.2343 - USN steel

Temperature in °C	20-100	20-200	20-400
Thermal expansion in 10-6m/m x K	11.8	12.7	12.9
Temperature in °C	20	200	400
Thermal conductivity in W/m x K	26.8	27.8	27.3
Temperature in °C	20
Density in g/cm3	7.74
Temperature in °C	20
E module in GPa	215

Heat treatment

Soft annealing	Temperature: 820 – 840 °C
	Cooling: slow furnace cooling
	Hardness: max. 220 HB
Hardening	Temperature: 1000 – 1020 °C
	Cooling Cooling in air, warm bath of approx. 540 °C, Oil/polymer; Interrupt oil or polymer quenching at 230 – 280 °C or vacuum hardening
Tempering	Temperature: 520 – 700 °C
	Hardness: see tempering curve
Nitriding	Possible
Preheat before use	Temperature: 150 – 350 °C

Graphs and datasheet for steel 1.2343 - USN

Continue time-temperature-transformation

Tempering

High-temperature strength