* EU importers would need to fill any import gap
* Drought hurting some South American producers
* Chinese buying of Ukraine corn fuels competition
* EU duties on U.S. corn risks broader trade war
HAMBURG, March 19 (Reuters) - The European Union's proposal to impose duties on modest U.S. corn imports would not cause major pain for European importers or American exporters, experts said on Monday, as Brussels draws up its response to Washington's plans for tariffs on metals.
But it could leave EU importers facing stronger competition as they seek alternative supplies in coming months due to heavy buying by China and problems with crops in South America, a major producer of corn, which is also known as maize.
The European Commission called on Friday for industry views on a list of U.S. products it could subject to 25 percent import tariffs, including corn, as part of its measures to respond to planned U.S. import duties on European steel and aluminium.
"I regard the possible EU import duties on U.S. corn as symbolic," said Commerzbank commodities analyst Carsten Fritsch. "The small volumes of corn imported by the EU from the United States could probably be replaced without major problems, and an import duty would not really hurt the U.S. much either."
The EU has imported 368,000 tonnes of corn from the United States from July to mid-March, during the current 2017/18 grains season, EU data show. That makes up just 3.1 percent of total EU corn imports, far behind the 5.1 million tonnes imported in the period from Ukraine and 5.0 million tonnes from Brazil.
In the previous season, the EU imported just under 800,000 tonnes from the United States.
"Maize imports from the United States do not represent much in the overall volume imported each season by the European Union," said Andree Defois of French analyst Strategie Grains
The EU usually imports about 1 million tonnes a year from the United States, out of total imports of 15 million tonnes, she said, adding U.S. genetically modified (GM) maize varieties were "refused by many industrial users, with the exception of Spain."
Strategie Grains expects EU nations to produce 59.9 million tonnes of corn in the 2017/18 season, meeting the bulk of the EU's needs.
From the U.S. side, EU sales are set to make up a small portion of the almost 63 million tonnes of U.S. corn the U.S. Department of Agriculture (USDA) forecasts will be exported in 2017/18.
"U.S. corn exports have also been booming in recent weeks and the U.S. has no shortage of purchase interest," Commerzbank's Fritsch said.
Yet the EU would still need alternative supplies to fill any import gap, which would increase competition for corn produced outside the United States, even if the amounts it sought were modest.
"The EU's imports of corn from the U.S. are relatively small in the EU's overall import volumes. The relatively small import total could be replaced elsewhere fairly fast, said Claus Keller of commodity analysts FO Licht.
"But it may not be a good time to have to start to look for alternative supplies, with a drought in Argentina, Brazils new crop still unclear and China buying a lot of corn from Ukraine," he said.
In addition, imposing tariffs on U.S. corn risked opening up a broader trade conflict on agricultural products, Keller said.
"The plan for corn import duties looks symbolic in terms of overall trade but could turn out to be an expensive symbol," he said. "There is also a danger of a trade war expanding into other sectors which could hurt European agricultural exports."
(Reporting by Michael Hogan Additional reporting by Valerie Parent Editing by Edmund Blair)