9HS74 or K0006

[AlanScrooby]

Hi all

i am looking for 9HS74 steel or SKF388K or K0006 is there any othere steels i can use for impact. forgabile in cold form.

regards

 

[TVP]

Those are all proprietary designations, not standard grades available from consensus standards like SAE, ASTM, EN, etc, so it is difficult to make any recommendations without knowing a little more about what you intend to do. Can you provide some additional information such as size of the part in question, desired strength level, end-use environment, etc?

Cold forging of alloy steels with medium-to-high carbon content (0.45-0.50%) is quite dependent on size and the type and amount of deformation required (upsetting, backward extrusion, wire drawing, drawing and ironing). Some possible standard grades to investigate include SAE AMS6431 and 655M23 (EN36B) or 835M19 (EN39B) according to BS 970. Here is a previous Eng-Tips thread that has some information as well:

http://www.eng-tips.com/viewthread.cfm?qid=173812

 

[AlanScrooby]

We are using K0006 in bar form from 30Diameter up to 130 diameter.

I would like to cold forge K0006 35mm Diameter and 50mm long as well as 40mm diameter and 50mm long

we receive the steel form Macsteel full annealed and we then Spheroidize the steel.

at present we CNC turn the drill bits but there is better strength in forging as well as taper control.

i would like to cold forge the hole bit inside taper and out side design and then mill the relief on the out side afterwords

do you Know any company that can forge this properly and are there any new advancements in steel in this application for impact and wear as well as holding a 3 micro interference fit of carbide buttons on the head.

i am also looking for a reliable Heat treatment company that can HT and austemper the bits with in spec ( my biggest problem is body failure dew to HT not correct).

Regards Alan

 

[TVP]

Alan,

If I understand your application, it looks something like this:

http://www.macleanfoggcs.com/products/mining-and-road-construction-bit-blanks/

If so, then I would recommend talking to McLean-Fogg (Saegertown) or NSS Industries (part of SPS Technologies):

NSS Technologies, Inc.
9075 General Drive
Plymouth, Michigan 48170
Phone: 734-459-9500
Fax: 734-459-4830
Email: nsssales@spstech.com

I have seen both of these companies manufacture this type of part, and both have the size of equipment needed to make relatively large blanks. Obviously this would require a secondary operation(s) to bring it to final shape. They use horizontal forming machines (commonly called headers or parts formers) that use coiled wire instead of bar as the feedstock.

With regards to austempering, the following are all specialists in this method:

Austemper, Inc.

http://www.austemperinc.com/contact.asp?pid=40

Atmosphere Heat Treating

http://www.atmosphereheattreat.com/

Applied Process

http://www.appliedprocess.com/