62 Profs. J. Dewar and J. A. Fleming. Changes produced in 



600- 



2oo 



100 



FIG. 3. Knitting-needle steel (tempered soft). 



60- 



FIG. 4. Chromium steel. 



Cr 

 C 



Si 

 Mn 



= 0-29 



= 0-16 



= 0-07 



= 0-18 



Fe = 99-30 



o- 



FIG. 5. Chromium steel. 



Cr = 1-18 

 C =0-27 

 Si = 0-12 

 Mn = 0-21 

 Fe = 98 -22 



loo 



50- 



FIG. 6. Chromium steel. 



Cr = 5-44 

 C =0*27 

 Si = '50 

 Mn = 0-61 

 Fe = 92-68 



ICO 



So- 



o- 



FIG. 7. Chromium steel. 



Cr = 9'18 

 C =0-71 

 Si = 0-36 

 Mn = 0-25 

 Fe = 89 -50 



