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jagadeesha
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Difference Between Cold Rolled and Hot Rolled Electrical Sheet? (Stamping)

07/28/2011 4:04 AM

What is the difference between Cold rolled and Hot Rolled Electrical Sheet (Stamping).

Why Cold rolled electrical sheet used in AC motor stampings?
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Fredski
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#1

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/28/2011 6:34 AM

You could have the answer already. Try using Google before you place such an elementary question to a forum.
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jagadeesha
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#2
In reply to #1

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/28/2011 6:50 AM

thank for feed back.. in google also i have not got..
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bravo88
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#3
In reply to #1

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/28/2011 6:50 AM

Hi Fredski,

You need not be so harsh on seemingly elementary questions. I think this forum is big enough to accommodate people from Guru to novice or just curiuos mind. It is free for all, free to give, free to take !

I, for one don't know the answer myself and don't mind learning about it. If some one did not post it, I will not have the opportunity to learn about it.

Just my two cents worth !

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Fredski
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#4
In reply to #3

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/28/2011 7:04 AM

I fail to see how hard it is to Google "hot rolled steel", and "cold rolled steel". Where's the difficulty?
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weldeng449
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#13
In reply to #4

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/29/2011 8:32 AM

Fredski,

The man was asking "WHY" one is used instead of the other for electrical components. You jumped so quickly to belittle him, you missed the point of the question. Had he google'd your suggestion, he would have learned about each type but not necessarily "why" one is used over the other for this specific application. If you were stumped by the question, simply don't waste your valuable and infinite wisdom in tapping out a reply. However, in the unlikely event that you actually know the answer, how about taking the opportunity to show that handsome Avatar by supplying a factual answer. I clicked on the link because I thought the question was interesting and want to hear what you "experts" replied with. If goes without saying that the "Fredski's" answer was not all that enlightening. Let's try this, the next time this forum is faced with having to endure your mug on here, how about providing something of value?
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Fredski
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#18
In reply to #13

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/29/2011 5:57 PM

I'm not an expert, I'm a blogger. I come here to share ideas and knowledge. You're quite wrong to assume I didn't understand the entire question or that I jumped to respond. I still feel his question was elementary. I felt then as I feel now that this person would gain for more knowledge on the topic if they actually took the time to research the topic. So besides being a self appointed whiner, what do you offer here?
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weldeng449
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#21
In reply to #18

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

08/01/2011 8:28 AM

Perhaps you're just blind to the condescending tone in your reply. I am certainly not the only one who picked up on it. As to what I have to offer?? How's this?

If, in the future, you can not contribute anything helpful towards the question asked, then simply go blog somewhere else. I'm positive that no one in here is interested in your directing any OP away from a forum that is designed to share information. However, should you still feel that overpowering need to thrust yourself into a conversation, you might try phrasing it this way:

"Hello, I Google's 'CR vs. HT' and found this link that might be helpful. (then attach a link)The only thing that I would add to this information is......[insert something useful here]."

Perhaps then, you would come off as helpful rather than a condescending AZZ!
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toolman911965
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#14
In reply to #1

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/29/2011 9:15 AM

Fredski, Though it may be perfectlya apparent to you and I as to how to use google, other people in other countries or cultures may not have things as easy. Please be respectfule enough, I for one am tired of seeing people bashed for their lack of understanding. I seem to recall there was a post about this very thing, why there are not as many questions and my feeling is because of rude and arrogant people making members feel unwelcome. If you dont like the question then dont answer it, very simple. Some people may have limited access and may not think of google. Also, sometimes looking on Google for something gives you too many choices and it is simpler to ask 'experts'. Either way someone wants to learn something and I think you should give the respect they deserve.

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kvsridhar
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#5

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/28/2011 7:10 AM

As Fredski says, Google gives plenty of stuff on this...just try one: http://www.spaco.org/hrvscr.htm

Anyway, your question should really have been "Why CRNGO is used for motor stampings and not CRGO?" If this is what you want to know, we can answer better....

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bravo88
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#6
In reply to #5

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/28/2011 7:23 AM

see, some seemingly elementary question leads to more substantial question and input. No one lose anything .

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jagadeesha
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#7
In reply to #5

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/28/2011 7:30 AM

thanks.. why in AC motor Cold rolled non-oriented electrical steel sheet is used why can't Hot rolled non-oriented electrical steel sheet
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kvsridhar
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#8
In reply to #7

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/28/2011 7:54 AM

Ah..so you know that only non-oriented steel should be used, so far so good. Sorry for presuming that you may not have known this.

As for hot vs cold rolling, please check out the link i gave, as well as many others that Google throws up.

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cuba_pete
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#10
In reply to #8

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/28/2011 3:30 PM

Yes...See Fredski? Google threw up all over this one!
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kvsridhar
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#11
In reply to #10

Re: Difference between Cold rolled and hot rolled electrical sheet(Stamping)

07/28/2011 9:32 PM

Yup...this kind of 'wot dat' is what makes google throw up

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rakesh_semwal
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#9

Re: Difference Between Cold Rolled and Hot Rolled Electrical Sheet? (Stamping)

07/28/2011 12:01 PM

Both are at par in magnetic properties if produced with same chemical compositions specially carbon content. But CRCA is widely used now a days as a electrical machines stamping because this is widely available and mostly thinner gauges (0.5mm) of sheets are made in CRCA. beside that, if offers burr free punching in compression of hot rolled. And its far better for tool life if you compare it with CRGO or CRNGO because it do not contain silicon which make CRGO and CRNGO very hard for peres work.

On other side CRCA can never be as as good as of CRGO and CRNGO in magnetic properties, But can be very useful and cost effective if you do the decarburization after the stamping and stacking process. depth of decarburization is important.Decarburization at sheet stage is not advisable because it make material too ductile for press work.
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sharath4
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#12
In reply to #9

Re: Difference Between Cold Rolled and Hot Rolled Electrical Sheet? (Stamping)

07/29/2011 1:54 AM

We can get CRNGO steel in the range of 0.2mm thickness also as i know.

Bur CRCA is more corrosive than these two and its magnetic properties are not good as compared to CRGO & CRNGO. Then why it is widely used? Will it not effect on motor efficiency?

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rakesh_semwal
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#15
In reply to #12

Re: Difference Between Cold Rolled and Hot Rolled Electrical Sheet? (Stamping)

07/29/2011 10:32 AM

Yes you are right for that matter any steel can be made in that thickness range.My statement was in compression of Cold rolled and hot rolled and it was just telling about the availability and not the manufacturability

Use of CRCA effect the efficiency significantly, But one can design and produce a good efficient product with decarburized CRCA, of course it can't be as good as of the product made from m36 or m45 CRNGO,But there are markets where economics take the front seat.
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sharath4
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#19
In reply to #15

Re: Difference Between Cold Rolled and Hot Rolled Electrical Sheet? (Stamping)

07/30/2011 12:14 AM

Thank You Sir

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jagadeesha
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#20
In reply to #15

Re: Difference Between Cold Rolled and Hot Rolled Electrical Sheet? (Stamping)

07/30/2011 9:44 AM

Thank you

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Deefburger
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#16
In reply to #9

Re: Difference Between Cold Rolled and Hot Rolled Electrical Sheet? (Stamping)

07/29/2011 11:07 AM

Rakesh to the rescue! THAT was the answer I was looking for! I knew it had to be related to the softness/hardness of the material AND the magnetic/electrical properties as well. Well done.

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rakesh_semwal
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#17
In reply to #16

Re: Difference Between Cold Rolled and Hot Rolled Electrical Sheet? (Stamping)

07/29/2011 11:41 AM

Deefburger Thank you for appreciations,
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Users who posted comments:

bravo88 (2); cuba_pete (1); Deefburger (1); Fredski (3); jagadeesha (3); kvsridhar (3); rakesh_semwal (3); sharath4 (2); toolman911965 (1); weldeng449 (2)

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