This is a commercial "plain carbon" steel. In any annealed condition,
it is practically "pure" bcc alpha-iron (about 98.5 percent by weight),
whose thermal expansion characteristics are well known. The (isotropic, no
preferred orientation) value for alpha sub l (linear thermal expansion
coefficient) given in ASM Handbooks is for alpha iron and 1013 steel,
11.7x10-6 in/in/deg C (volume thermal expansion coefficient to very good
approximation, alpha sub v, is 3 times alpha sub l).  Hope this helps.

Best regards,

Jon Hiller
==================================================================
Jon M. Hiller
Argonne National Laboratory
Materials Science Division
Electron Microscopy Center
Tel: 630-252-9558
Fax: 630-252-4798
Email: hiller@anl.gov
==================================================================