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Member postings for David Haley

Here is a list of all the postings David Haley has made in our forums. Click on a thread name to jump to the thread.

Thread: Steel?
17/02/2016 17:22:56

This doesn't surprise me! Some of the tool steel that we have come across from India and Pakistan is by far the worst I've ever seen, Huge amounts of silicon, hard spots, soft spots, inclusions and laminations, the stuff of nightmares before you even try to heat treat and work the steel! What worries me most though is the amount of products that are being brought over, 'washed' through EU companies and then passed off as made in Europe from high quality sources!

Thread: Gauge plate as bought
24/11/2015 15:37:11

Posted by Tim Stevens on 23/11/2015 14:25:56:

As it comes, is Gauge Plate annealed, or normalised, or what exactly?

And while you are thinking, what do our American cousins call it (I can find no reference in Machinery's 1980)?

Thanks, Tim Stevens

Hi Tim,

I currently manufacture gauge plate and ground flat stock in the UK. Gauge plate is a broad term for the product itself as it is manufactured by us in three different grades of steel, companies in Germany manufacture it in up to 25 different grades of tool, high speed and powder metallurgy steels and the US in 10 grades. The most common in the UK is O1 tool steel. All gauge plate and ground flat stock as it is more commonly known across the world is always supplied in its annealed condition. O1 is supplied at a maximum of 229hb. If you need any other information or tech specs please let me know

David

Thread: Ground Flat Stock
05/09/2015 11:27:48
Posted by jaCK Hobson on 05/09/2015 10:53:49:

It depends on lots of things

For 01, which is your most common flat tool stock, oil quench is fast enough to get you past the pearlite nose in the TTT diagram. So oil is all you need.

Faster quench will just introduce risk of distortion or cracking. That risk is less for small parts.

Cold water quenches faster than hot.

Hot oil quenches faster than cold.

For O1 and smaller or thinner parts, cheap veg oil will do fine.

Low temp heat treat salts are often best of all (similar to hot blue salt and similar to chemicals you might need for explosives). These are at high temp when you quench - just above the temp at which martensite starts to form - but they quench really fast. So quench, hold a little while to even out the temp (and stresses) then cool further.

Molten lead baths were used no so long ago. Pure lead melts a little high so it was probably some alloy. Lead doesn't quench as fast as salt, and it is a bit more risky from health and safety point of view.

Heat treating develops a pragmatic view of heath and safety!

O1 is designed to be easy to heat treat. You can get something hard with a wide range of treatments. For best results, do exactly what it says on the tin/packaging paper (I've spent many hours of research to come to that conclusion).

Edited By jaCK Hobson on 05/09/2015 10:56:13

Edited By jaCK Hobson on 05/09/2015 11:01:38

Some very sound advice! The instructions on the packaging we try to keep as simple as possible to ensure you get good results with minimal distortion and ease of use at home. It starts to get a bit more complicated when you start heat treating some the D2 and Niolox at home as more sensitive equipment is needed to get accurate results.

03/08/2015 12:39:39
Posted by John W1 on 02/08/2015 20:22:12:

I just searched for guage plate and these people came up who have just opened a mail order shop

**LINK**

John

-

Hi Everyone,

Thanks for finding your way to our webshop! If there is anything you need but can't find on the web-shop feel free to get in touch as we do keep more dimensions in stock that are not sold through the web-shop. We are also in the next week adding a few more products in the stock range. One is D2 in 'oversize' ground flat stock and the second is a stainless grade called Niolox (Simular to 440C stainless). If you need any more info please feel free to ask a question or drop me an email at [email protected]

Thanks

David

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