The announcement was made by Pirates Senior Vice President, General Manager Neal Huntington.
"Byung-Hyun Kim is a veteran right handed pitcher who has pitched, and wants to again pitch, late in games out of the bullpen," said Huntington. "He has been tough on right-handed hitters over the past three seasons and had success against both left-handed hitters and right-handed hitters when he pitched primarily as a reliever. Byung-Hyun will compete to earn a role on our club as a reliever and he adds an experienced option for us in our bullpen competition."
Shortly after Sunday's scheduled spring training drills had ended, Kim arrived at Pirate City and worked out for about a half hour.
He recently returned from an offseason stay in his native South Korea, and only resumed throwing about two weeks ago.
Kim posted a career high in victories in 2007 after going 10-8 in 28 games (22 starts) with Colorado, Florida and Arizona.
He went 8-7 in his 22 starts and 2-1 in his six relief appearances.
Since the beginning of the 2005 campaign, Kim has held right-handed batters to a .251 batting average against (207-for- 824), a .397 slugging percentage and .319 on-base percentage. During that same time period as a reliever, Kim has held hitters to a .273 batting average against (33-for-121) and just three home runs in 121 at bats in 24 games while working in relief.
The 29-year-old native of Gwangju, South Korea, broke into the big leagues with the Diamondbacks in 1999. During the 2002 campaign he posted a career-high 36 saves and a 2.04 ERA in 72 appearances with Arizona. In 394 career major league appearances (87 starts), he has gone 54-60 with 86 saves, 806 strikeouts and a 4.42 ERA (841.0ip/413er) with Arizona, Boston, Colorado and Florida.