WASHINGTON, May 22 (Reuters) - The U.S. Trade Representative's office on Wednesday said some of the steep tariff increases on an array of Chinese imports including electric vehicle batteries, computer chips and medical products will take effect on August 1 after a 30-day comment period ends.

President Joe Biden will keep tariffs put in place by his Republican predecessor Donald Trump while ratcheting up others, including a quadrupling of EV duties to over 100% and doubling the duties on semiconductor tariffs to 50%.

The new measures affect $18 billion in imported Chinese goods including steel and aluminum, semiconductors, electric vehicles, critical minerals, solar cells and cranes, the White House said. The EV figure, while headline-grabbing, may have more political than practical impact in the U.S., which imports very few Chinese EVs.

The United States imported $427 billion in goods from China in 2023 and exported $148 billion to the world's No. 2 economy, according to the U.S. Census Bureau, a trade gap that has persisted for decades and become an ever more sensitive subject in Washington.

U.S. Trade Representative Katherine Tai has said the revised tariffs were justified because China was stealing U.S. intellectual property. But Tai has also recommended tariff exclusions for hundreds of industrial machinery import categories from China, including solar product manufacturing equipment.

Ahead of Biden's expected action,

China denounced the plan

and vowed "resolute measures" to protect its interests. China has said the tariff measures are counter-productive and inflict harm on the U.S. and global economy. (Reporting by David Shepardson; Editing by Lisa Shumaker)