Hi,
After hardening,the steel will become brittleness and hardness will also increase. To reduce hardness and brittleness better go for Tempering the steel and cool in air.It will help to reduce the harness and brittleness.
Ask your heat treatment company to do tempering. Tempering temperature shall not be more than the Lower critical temperature of the steel.
You have not given the material thickness. As a thumb rule,tempering temperature for thickness up to 1 inch shall be 1 hour minimum. more than 1 inch you can add 1 hour per inch.
Thanks & Regards,
(Karthik)
Karthikeyan.S
QA/QC Manager
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282
From: Amos Majola <amos@turnmill.co.za>
To: materials-welding@googlegroups.com
Sent: Thursday, December 8, 2011 12:41 PM
Subject: [MW:13163] Induction hardening
Hi
I am working for a fabrication company in South Africa. We have BS970: 709M40 (EN19) material 140mm in diameter, 230mm wide. We have done induction hardening and the client specification requires 350HB, +/-20HB. After the hardening was done we have an average of 430HB, how can we reduce this back to the required value of 370HB, please advice.
Regards
Amos.Q Majola
Quality Control Manager
Cell: (+27)79-8897173
Tel: (+27)16-986 8205
e-mail: amos@turnmill.co.za
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