1.2343, AISI H11, 1.2344, AISI H13 – INTRODUCTION AND APPLICATION

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Alloy tool steels are used for the hot working, for moulds, and die casting of aluminum alloys. Moreover, this can also be used for magnet, zinc, copper alloy bars, pressing pipes, and light metals under pressure. This tool is characterized by the resistance to tempering, the possibility of working at high temperatures, very high hardenability, and low susceptibility to forming a surface crack net.

There are also disadvantages as, during operation, the grades are low sensitivity to rapid temperature fluctuations. They are also of low impact and shock resistance. That’s why everyone must be warmed to a minimum temperature of 200 C before the use of the tools. This limit must be not be exceeded and should be under control of the tempering temperatures. For the production of hot working knives, screws die, die inserts for presses, moulds for plastics, forging machines, mandrels, punches, stamps, and copper rolling mills this 1.2343, AISI H11, 1.2344, AISI H13 tool steel is widely used. For ESR electroslag melting, tool steel 1.2343/1.2344 is available as it guarantees high purity. For casting non-ferrous metal alloys under pressure, this tool steel is totally recommended. ESF guarantees the fine-grainability of the tool steel.

In this article, I will tell you about the H11 Chromium hot-work steels. These steels have low carbon content and good toughness. They can be deep hardened by heat treatment and air-quenching.

Introduction to Tool Steel 1.2343/1.2344

The group H steels are specially designed for the Chromium hot-work tool steels. According to the AISI classification system, all H group steels work for Chromium hot-work tool steels purpose. H group steel series start from AISI H1 to AISI H19, and the most commonly used Chromium hot-work steels are AISI H11, AISI H12, and AISI H13. These steels can be air-hardened in 150 mm thick sections. During hardening, the steels are subjected to minimal distortion due to their balanced alloy content. With the use of water, you can easily cool down the tools produced by Chromium hot-work steels without causing any further damage. All these steels contain low carbon and alloy contents.

Fabrication and Heat Treatment

Machinability

H11 tool steels have a machinability rate of 75%. This is nearly the same as of W group tool steels.

Forming

All the tool steels of H11 are formed by using conventional methods. Machining and forging are also some other methods.

Welding

One can easily weld the H11 tool steels by conventional methods.

Heat Treatment

The tool steels of the H series can be preheated to 816°C (1500°F). By increasing the temperature to 1010°C (1850°F) followed by holding for 15 to 40 mins, these steels are directly heated. Therefore, these steels are then air-quenched.

Forging

For the forging of the H11 tool steels, the required temperature is 1121°C (2050°F). Forging below 899°C (1650°F) is not preferable for these types of steels.

Cold Working

You can perform the cold working on the H11 tool steels by using conventional methods.

Annealing

The annealing temperature of the H11 tool steels is 871°C (1600°F), and you can slowly cool them at 4°C (40°F) in the furnace.

Tempering

At temperature ranging from 538 to 649°C (1000 to 1200°F), the tempering is carried out on the H11 tool steels. This is the one that is used to obtain Rockwell C hardness of 54 to 38. In these steels, double tempering can also be performed every hour. This can only be done at the preferred tempering temperature.

Applications

For designing highly stressed structural parts such as aircraft landing gear, these H11 tool steels are very suitable.

Other designations of the grade:

Tool steel for hot work 1.2343, 1.2344, X37CRMOV5-1, X40CRMOV5-1, AISI H11, AISI H13 following ISO 4957 is essential. Some other designations of the grade are AISI H13, AISI H11, 1.2343, X 37 CrMoV 5-1, 1.2344, X 40 CrMoV 5-1. Other than this 4Cr5MoSiV, 4Х5МФ1С, 4Х5МФС, 4Ch5MF1S, 4Ch5MFS, Z38CDV5, SKD6, F-520.G and WCL, WCLV, UNS T20813, UNS T20811, X35CrMo05KU, BH11, BH13, X41CrMoV5-1, 1.7783.