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Associate

Join Date: Apr 2009
Posts: 32

Annealing of Low Carbon Steels

09/20/2012 8:56 AM

Hi everyone. I need your inputs regarding raw material procured from steel mills. We are doing carburizing, hardening and tempering of the material. Kindly throw light on the following.

  1. If BHN of raw material is ok, then whether annealing is required or not since some steel mills are doing annealing and some are not.
  2. If annealing is not being done by steel mills keeping BHN in range, what impact it would have later on since annealing is done to stress releasing also as I understand.
  3. Does annealing affect the process of machining after/before heat treatment.
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Guru

Join Date: Oct 2007
Location: India
Posts: 1246
Good Answers: 34
#1

Re: Annealing of Low Carbon Steels

09/20/2012 9:43 AM

1. Annealing is not required. Some steel mills may be doing annealing, due customer requirement.

2. Annealing is used to induce ductility, soften material, & relieve internal stresses. If these qualities are required by costumer, then it is done.

3. Yes, it does.

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Associate

Join Date: Apr 2009
Posts: 32
#2
In reply to #1

Re: Annealing of Low Carbon Steels

09/20/2012 10:43 AM

Thanks for the prompt inputs Joshi ji.However still Ineed to know 1) Why some customers insist on annealing and others not? 2) In what way annealing effects machining post heat treatment. 3) Do the stresses not released (during annealing) come out and cause micro cracks?

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Guru

Join Date: Oct 2007
Location: India
Posts: 1246
Good Answers: 34
#3
In reply to #2

Re: Annealing of Low Carbon Steels

09/20/2012 11:30 AM

1. It caters to the customer's requirement, & economy/pricing.

2. Machining finish is homogeneous, fine finishing.

3. Possibly, yes.

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Commentator

Join Date: Mar 2008
Location: Hosur, INDIA.
Posts: 81
Good Answers: 4
#4

Re: Annealing of Low Carbon Steels

09/22/2012 1:50 PM

Dear Mr Ankush Jain, Customers order Low Carbon Steel from the Steel mills, specifying the condition supply ie. Hot rolled Bar Or in coil form or Bright Bar as rolled or Annealed depending on the end use. Eg. If it is a machine shop they may order only in Hot rolled condition. If it is required for cold heading to make bolt, nut etc. then they prefer to order in annealed condition. Again as per customer's requirement they may also suppld in normalised condition. Further all the cold forging conpanies do specify annealed condition. very often these companies order hot rolled bars, then do slugging & spherodize anneal before cold forging. Hope this clears your doubts. Rangasamy.

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ANKUSH JAIN (1); Joshi (2); Rangasamy (1)

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