surface hardining

Hello girishpurohit

The corollary of your Signature is: Earning never lends.

Please reply, with

Kind Regards....

Actually, the issue isn't the hardening process. Its WHAT MATERIAL will be capable of through hardening to a depth of 40 mm in a 150 mm section?

Usually one does not harden to 25% of section, so details about your application would help us help you avoid overspecifying the wrong material or process for your application.

As for grinding question, that is unrelated to hardening- grinding won't harden plate 40mm thick. best method- depends on your situation. as the ol' sparkstation indicated, more facts about what you are trying to accomplish will help us help you. But the economics will almosyt always have a way of trumping what us 'experts' say is best...

milo

you said it all-Milo!

Thank you, mr rocket assisted tortoise

milo

girishpurohit,

Induction hardening is most preferable when a specific degree of hardness to a specific depth is required.

Grinding operation criteria, in effect the dimensional characteristic and is necessary to advise you.

What size, shape and the quantity?

150mm is a SLAB-not a rolled plate

What is your Q

Send a Picture-- Cross section

40 mm out of 150 mm will be Through Qenching-not Surface Hardening!

Who will ever need a 150 mm thick slab with 40mm hard(HB/HR_C) on one face?

Tell us your application -- if you really have one--

Pose serious ,meaningful technical issues only.

CR4 is not any old blogsite

Okay I'll bite, why quenching vs. surface hardening? Yes 40mm is about 1-1/2" and 5",

8" or even 10" plate is hot/cold rolled while slabs are cast.

Quenching brings thoughts of distortion and other untenable reactions.

I believe the point is that 40mm depth requested is not "surface" hardening. it is through hardening. and that will require alloy, not plain carbon grade.

ANd regardless, an austenitization followed by a quench will be the means to achieve hardening through microstructural transformation to martensite.

If somebody has a way to coldwork 40mm deep to create a 40mm deep surface hard layer, well, I'll write up their application forthe nobel...

milo

I truly believe this thread is moot but for sake of discussion.

'ANd regardless, an austenitization followed by a quench will be the means to achieve hardening through microstructural transformation to martensite.'

Quite agree. As I originally stated induction hardening is accomplished finished via quenching.

'40mm depth requested is not "surface" hardening. it is through hardening. and that will require alloy, not plain carbon grade.'

The described is about 5" thick 40mm is less than 1/2 thickness, through hardening?? Unusual to surface harden to 40mm depth but surely medium carbon steel is up to the task. An alloy would be fructuous but may be not essential.

Why full hardening to 40mm depth would be required is a greater curiousity.

Hi all,

Please, don't be so crude...

Think if all question were single problems with n variables and n-1 known → Wouldn't be rather boring? This probably convert CR4 threads in a single dialogue with few room for discussion!!!

I like the Sparkstation Windows-like alert. May I suggest a small contribution? Could begin the alert with "Fatal error"?

Jokes apart, hardening a 40 mm layer of 150mm total thickness is a very strange requirement.

But I think there are some other methods if anybody wants to have such a thick slab with 40 mm of one side with different properties (in this case hardness, but can be any other). What about cladding of 110 mm thick with 40 mm hardest material (we don't even know both hardness values)?

We don't have either length and width or quantity of pieces to manufacture, but it's seems a case for weld overlay or explosion cladding, doesn't it?

Have a good day

Quite so!

I've been absent and inspecting a curiousity of mine. About ten miles west of Mandan, ND on interstate 94 USA frost heaves have distorted the concrete slab (8") and actually produced a radius. a rounded protrusion upon the roadway straightway across the hi-way about 4-6" in height.

Wow! It happens every year of course but still it is concrete after all.

Hello Kwetz

Just what you ordered.

Feel free to use this sign.

Kind Regards....