Boeing Tianjin Composites Co Ltd, a subsidiary of Boeing Co in China, signed a contract Wednesday to buy metal parts for the Boeing 737, 747 and 787 aircraft from Shenyang Aircraft Corporation. The contract was signed at the 2015 China Aviation Expo in Beijing.

Shenyang Aircraft will provide 72 varieties of metal parts with a value of $9.9 million to Boeing for six years. .

Meanwhile, Boeing Co also signed a contract with Chengfei Commercial Aircraft Co (CCAC) to produce rudders for the Boeing 787-10 Dreamliner, the US aircraft builder announced on Wednesday.

CCAC, an Aviation Industry Corporation of China (AVIC) company based in Chengdu, Sichuan province, has supplied composite rudders for the 787 family since production of the airplane began in 2008. The new contract is an expansion of its current work.

The two sides did not release the amount and period of the new contract.

"This contract award reflects not only how much we value the quality of their work, but the strong relationship we've developed by working together to strengthen CCAC's composite manufacturing capabilities and the level at which they support our market affordability goals," said Kent Fisher, Boeing Commercial Airplanes' vice president and general manager of supplier management.