Sebastian Vettel led the second practice session in which Red Bull consistently had the quickest car.
The reigning world champion edged team mate Mark Webber by three hundredths of a second around the Korea International Circuit.
Fernando Alonso was third-quickest for Ferrari, three tenths of a second off the RB8s, followed by the McLaren of Jenson Button.
Red Bull led the way at the beginning of the session while the drivers were running on softs. But Vettel was one of several drivers who found difficulty extracting a good time out of the super-soft tyres.
He ran wide at turn one on his first effort and made a similar, smaller mistake the next time around. Webber briefly took over at the top of the times but Vettel finally got a clear run in to set the quickest lap.
Other drivers were having trouble in traffic. Michael Schumacher slowed and gesticulated angrily at Pedro de la Rosa after the HRT driver held him up at turn three. Alonso also cut it fine, dodging around the other HRT of Narain Karthikeyan as he began a lap.
Sergio Perez’s problems were more serious. He lost DRS as he began his first flying lap, then the C31 let him down completely, coming to a stop on the track. The car was returned to the pits before the end of the session but the team were not able to get Perez back on the track.
Having been quickest in the first session there was little sign of the same pace from Lewis Hamilton in the second. He ended up eighth, half a second off his team mate’s time.
2012 Korean Grand Prix
- Alonso: ‘We’re fighting against Newey’
- Vettel earns Driver of the Weekend for Korea win
- Korean Grand Prix gets lowest rating of season so far
- F1 fans’ videos from the 2012 Korean Grand Prix
- Korea “most disappointing race” this year for Williams
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