General description
Hard-Revishield®55-GP- is a self shielded, open arc, flux cored tubular electrode designed to provide a hardfacing overlay on new or old steel components. Although, Hard-Revishield®55-GP is primarily designed for the open arc operation, it may be used under a neutral flux for conditions requiring spatter elimination and removal of arc glare. A long stickout for maximum efficiency and minimum penetration.
Application
Hard-Revishield®55-GP produces a martensitic and some retained austenite deposit with a hardness range of 50-59HRc. This microstructure makes Lincore 55 particularly suitable for applications involving sliding, rolling and metal to metal wear, coupled with resistance to mild abrasion.
Typical applications
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Crane and mine car wheels |
|
Gear teeth |
|
Skip guides |
|
Dredger buckets |
|
Scrapper blades |
|
Transfer tables |
|
Cable sheaves |
Classification
|
DIN 8555-83 |
:MF2-GF-55-GP |
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.
A preheat of up to 250°C is necessary to prevent cracking in situations of high restraint and/or heavy thicknesses. Interpass temperatures between 150 - 300°C do not adversely effect deposit hardness. The deposit thickness is usually limited to 2 layers on high carbon or alloy steels and/or situations of high restraint and heavy sections due to the risk of cracking. Higher preheat and interpass temperatures coupled with slow cooling will minimise the risk of cracking.
The weld metal is not machinable by conventional methods although the deposit can be shaped by grinding.
The deposit can be softened by annealing at 875°C for one hour and slow cooling (air cool 22- 43HRc, furnace
cool 15-17HRc). The hardness can be restored by heating at 875°C followed by water quenching (50-59HRc). The
component should then be tempered at 150-200°C for one hour (54-59HRc) to retain some toughness.
Welding positions
Chemical composition (w%) typical, all weld metal
|
C |
Mn |
Si |
Cr |
Al |
Мо |
|
0.45 |
1.4 |
0.55 |
5.3 |
1.4 |
0.8 |
Mechanical properties, all weld metal
|
|
Typical hardness values |
|
Layer 1 |
50-59 HRc |
|
Layer 2 |
50-59 HRc |
Welded on Mild Steel Plate (12 mm)