Excavaror mounted hydraulic hammer gat material? 1

[seahawks]

I am looking for information on the grade of steel of the Hydraulic hammer "gat" or "bit" that is used to chrush rocks or break up concrete slabs. I am trying to turn a custom adaptor to weld to the end of the bit to hammer plate piles into medium hard sand stone.
Any information on the material, gtaw electrodes, welding procedure, pwht, etc, are used for a high impact bit such as this would help point me in the right direction on this project.

 

[arunmrao]

The chemistry of the bits or tooth points used for excavation is as follows.

C-0.25-0.3%, Mn-1.2-1.3%, Si-0.5-0.6%, Cr-1.2-1.5%, Mo-0.3%.

These are then oil quenched and tempered to 38-40RC hardness.

A cheaper alternate material is high manganese hadfield steel.

" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke

 

[seahawks]

Is this 4140, 30 or ? Is there a web address that you know of that I can look it up myself? Thank you for the information.

 

[arunmrao]

It is close to 4130 steel.For cost consideration this grade is selected. But if you have a choice you could consider using 4330 which will have a better performance.











































































" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke

 

[EdStainless]

Didn't a lot of these tools used to be made from High Mn steels (Hadfield types)? These alloys are more expensive, but they offer superb resistance to abrasion and shock.

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or edstainless@earthlink.net

 

[EdDanzer]

I know of one manufacture using 4340. None of these weld well.

Ed Danzer

http://www.danzcoinc.com

http://www.dehyds.com

 

[Zambo]

Can't you pre-drll the rock and then fit a hydraulic vibro to your excavator to drive the piles?