Steels_ Metallurgy and Applications, Third Edition

Engineering steels 215

15-

.9o "~ I = e.= _ 9 -

~ o

251-- ,*,

,g 20

ci ,o

9 N

5

500

, ae a

I I I_ I

0 1 2 3 4 5 6

Soluble boron (10-3%)

Figure 3.15 Effect of boron on hardenability (After Llewellyn and CooP)

800

700

600

400

300

200

0.81% C

0.70% C

0.60% C

0.21% C ~~,,,-~~~

0.490/o c / "-

0.40% C /

0.31% C

I., ] ,_ I .... I I I .... 1 I.,.I

10 15 20 25 30 35 40 45 50

Distance from quenched end (mm)

Figure 3.16 Effect of carbon on hardenability of SALE 86B00 steels (After Llewellyn and
CooP)