To provide a continuous casting method of spring steel, which method can reduce central segregation based on specific operational conditions.
The central segregation of the spring steel containing 0.55 to 0.65 wt.% of C. 1.30 to 2.10 wt.% of Si, 0.40 to 1.10 wt.% of Mn, and 0.10 to 0.70 wt.% of Cr is reduced as follows. The thickness D of a casting mold is set to 350 to 410 mm. The casting speed Vc is set to 0.50 to 0.65 m/min. The specific water content Wt is set to 0.25 to 1.00 L/kgSteel. The degree T of super heating is set to 10 to 45C. The gradient GRD of a roll in a meniscus length M of 10.0 to 22.3 m is set to 0.0 to 5.0 mm/m. The gradient GRD of the roll in a meniscus length M of 22.3 to 25.9 m is set to 0.5 to 3.0 mm/m. The gradient GRD of the roll in a meniscus length M of 25.9 to 27.5 m is set to 1.0 to 2.0 mm/m. The gradient GRD of the roll in a meniscus length M of 27.5 to 32.3 m is set to 0.5 to 1.5 mm/m.
KOBAYASHI TAKASHI
NAKADA HITOSHI
MORISHITA MASAFUMI
| JP2007275987A | 2007-10-25 | |||
| JP2008062250A | 2008-03-21 | |||
| JP2008062249A | 2008-03-21 | |||
| JP2006110618A | 2006-04-27 | |||
| JP2005211920A | 2005-08-11 | |||
| JPH04103741A | 1992-04-06 |
Makoto Suhara