The spring steel 65Mn was produced by 100 t top and bottom combined blown converter melting- ladle furnace refining- 6 strand 150 mm×150 mm billet concasting. The end point [C] was0.08%～0. 12%

[P]≤0.012% and [S]≤0.03%

and the yield of recarburizer was 85%～90%. During refining the basicity of slag was 2.5～3.0 with feeding Si-Ca wire and argon stirring. During concasting the temperature of liquid steel in tundish was 1495～1515 ℃

the casting speed 1.6～1.8 m/min using mold electromagnetic stirring. The quality experiment results of 20 heats 65Mn steel showed that the analyses of steel were C 0.63~0.68

Mn 0.95～1.07

P0.009～0.023

S0.006～0.017

and the deviation of carbon content at section of casting billet was ≤0.02%.The coil products of 65Mn steel met the requirements of standard GB/T4354- 1994.