HONG KONG--The parent of China's largest oil refiner raised $6.4 billion in a bond sale that ranked as Asia's third-biggest on record, with some of the lowest borrowing costs ever for an Asian company thanks to Europe.

The offering by state-owned China Petrochemical Corp., also known as Sinopec Group, is exceeded only by Alibaba Group Holding Ltd.'s $8 billion debt sale in November and Bank of China Ltd.'s $6.5 billion offering that beefed up its capital in October, according to data provider Dealogic.

By tapping European investors, Sinopec was able to borrow at costs as low as 0.5% and 1% for its three- and seven-year bonds, totaling 1.5 billion euros ($1.6 billion). The timing was especially fortuitous for the company as the benchmark 10-year German bund sank to a low of 0.07% Monday under pressure from aggressive European Central Bank measures to stimulate the sluggish economy.

The rest of the debt, sold in dollars with coupons between 2.5% and 4.1% and lengths up to 30 years, attracted more than $15 billion in subscriptions.

The heavy subscription by investors underscores increased demand for the higher yields in emerging markets, especially if they are backed by governments. It also suggests investors are shrugging off concerns over energy companies as oil prices start to rebound, and they are still buying despite the likelihood of a U.S. Federal Reserve rate increase this year that would send yields higher.

Sinopec Group--the parent of Hong Kong-listed China Petroleum & Chemical Corp., or Sinopec Corp.--plans to use the proceeds to refinance existing debt and for "general corporate purposes" of overseas businesses, according to its prospectus.

The deal surpassed Sinopec Group's own $5 billion bond issue a year ago and Indonesia's sale of $4 billion in sovereign debt in January last year.

The lower oil price will result in "a big drop" in profit for Sinopec Group and its units and weaken their credit metrics, Moody's senior analyst Chenyi Lu said, but the group's "good business diversity, conservative capital spending and strong access to liquidity will help preserve their financial profile." The agency rates the company at Aa3, among top of investment-grade ratings.

Write to Fiona Law at fiona.law@wsj.com

Access Investor Kit for China Petroleum & Chemical Corp.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=CNE0000018G1

Access Investor Kit for Bank of China Ltd.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=CNE000001N05

Access Investor Kit for Bank of China Ltd.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=CNE1000001Z5

Access Investor Kit for China Petroleum & Chemical Corp.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=CNE1000002Q2

Access Investor Kit for Bank of China Ltd.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US06426M1045

Access Investor Kit for China Petroleum & Chemical Corp.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=US16941R1086

Subscribe to WSJ: http://online.wsj.com?mod=djnwires