ETG® 25 – a high-strength special steel for high-quality welded joints

Despite its high strength, ETG® 25 shows good weldability. However, it is important to note that depending on the welding conditions and the filler metals used, there may be a reduction in strength and a degree of hardening within the welded joint and in the heat-affected zone. Due to the chemical composition of ETG® 25, any hardening is relatively minor and can be eliminated by tempering at 400–450 °C.

Steeltec’s ETG® 88 / 100 steels are less well suited to welding, but can be welded using austenitic electrodes, though a significant reduction in strength is to be expected. The ultimate tensile strength of the welded joint will depend on the quality of the weld and the physical properties of the filler and parent metals To avoid failure, we recommend that test welds are carried out before the final weld operation is performed. The best results are achieved with tungsten inert gas (TIG) welding.

• Welding process: Tungsten inert gas
• Filler metal: X15CrNiMn 18-8 (1.4370)
• Preheating temperature: 300 °C
• Tensile strength of welded joint: 490–670 N/mm2

ETG® 88 / 100 steels are not suitable for laser welding.

Rolled steels with good welding properties

For the best welding results, the CO2 content in the steel should be kept as low as possible and Steeltec adjusts the chemical composition accordingly. Weldability is a crucial property for chain steels and engineering steels, but it is also important in other applications, such as manufacturing gabions and crates from steel wire. Rolled steels from Steeltec can be welded using a variety of welding methods.

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