Elehard® 55-RZ

General Description

Heavily coated electrode that produces a martensitic deposit similar to AISI 420 stainless steel.

Designed for operator appeal and weld quality having excellent arc characteristics.

Good restriking and low spatter levels.

The electrode coating permits the use of the drag or contact welding technique as well as positional welding if required.

Current type

AC/DC electr. +

Application

Elehard® 55-RZ electrodes are intended to provide abrasion resistance under conditions of high corrosion, abrasion and impact. The electrode can be used on carbon steels, low alloy steel and martensitic steel.

Typical applications include:

Sand pumps

Dredging equipment

Fans

Valve seats in steam and liquid pipes

Classification

DIN 8555-83

:E6-UM- 55-RZ

Welding positions

         

Additional information

All work-hardened base material and previously deposited hardfacing material should be removed prior to applying a new deposit, since such areas are prone to embrittlement and possible cracking. Areas that contain irregularaties such as cracks and deep gouges can be repaired locally using Elehard® 30-GР or Elehard® 250-КР prior to hardfacing with Elehard® 55-RZ.

Preheat would be needed if the welding is done over either highly restrained material or martensitic stainless base metal.

Preheat would be needed if the welding is done over either highly restrained material or A preheat and interpass temperature in the range of 200-300°C can be used depending on the nature of the material to be welded.

Under conditions of low dilution, the microstructure is similar to that of AISI 420 martensitic stainless steel. This structure provides good abrasion resistance under conditions of severe corrosion and high impact. At higher dilutions, when overlaid on mild steel or low alloy steel, the weld metal microstructure will retain it’s martensitic stainless structure. But the reduced chromium level might adversely affect the corrosion resistance of the deposit.

Chemical composition (w%), typical, all weld metal

C

Mn

Si

Cr

Mo

Ti

0.5

0.3

0.4

12.4

0.4

1.3

Mechanical properties, all weld metal

Typical hardness values: 55HRc (560 HB)