Austenite Grain Growth Kinetics in API X65 and X70 Line-Pipe Steels during Isothermal Heating

Table 1

Chemical composition of API steel grades X65 and X70.

Steel	C	Si	Mn	P	S	Al	Ti	Cu	Cr	Mo	Nb + V	Ni	N
X65	0.08	0.25	1.5	0.01	0.002	0.05	0.02	0.003	0.016	—	<0.12	—	0.005
X70	0.05	0.25	1.5	0.01	0.002	0.04	0.018	0.05	0.014	0.2	<0.09	0.02	0.0064