Bake Hardening Steel

Dear friends,I want to know what is the Bake Hardening Steel? what are the processes to make this kind of low steel carbon.
Please tell me some informations,and some links to follow. thanks a lot.
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I think it is covered by Llewellyn in "Steels"
http://books.google.com/books?id=4iceanvJcHcC&pg=PA123&ots hx4wU6-Z&dq=llewellyn+steel&sig=CqsZi7CWdcNdQv9_jbWzXMryryk#PPA115,M1
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