The steel dispute between Japan and the United States will calm down shortly because Washington is expected to exempt more products from its import safeguard tariffs, including those from Japan, the head of the largest business lobby in the United States said Wednesday.

"Over a short period of time, you will see sufficient exemptions," said Thomas J. Donohue, president and chief executive officer of the U.S. Chamber of Commerce.

The U.S. imposed tariffs of up to 30 percent on an array of steel imports in March in response to complaints from U.S. manufacturers that they are being hurt by cheap steel imports. The tariffs will last for three years.