Consegui resolver dessa forma
int j = 53;
for (int i = 1; i < 25; i++)
{
var fontArial = new Font(new FontFamily("Arial"), 9, FontStyle.Regular);
var posicaoX = (int) chart1.ChartAreas[0].AxisX.ValueToPixelPosition(chart1.Series[0].Points[j].XValue);
var posicaoY =(int) chart1.ChartAreas[0].AxisY.ValueToPixelPosition(chart1.Series[0].Points[j].YValues[3]);
graphics.DrawString(i+"", fontArial, new SolidBrush(Color.Black), new Point(posicaoX, posicaoY));
j = j + 60;
}