BEIJING, Aug 6 (Reuters) - China"s robust export growth likely moderated in July amid an acceleration in COVID-19 cases globally and continuing severe pressure on global supply chains, a Reuters poll showed on Friday. Although there are signs China"s strong industrial recovery in the first half of the year may be losing some momentum, overseas demand has remained strong in recent months even as factories in many countries return from lockdowns. Headline trade numbers are also being helped by the statistical base effects when compared with sharp declines a year ago. Exports are expected to have risen 20.8% in July from a year earlier, according to the median forecast in a Reuters poll of 21 economists, compared with a 32.2% gain in June. Imports likely rose 33.0% last month year-on-year, the poll showed, compared to 36.7% growth in May. Despite China"s attempts to cool surging raw materials prices, commodity prices remain elevated. Exports grew much faster than expected in June, as solid global demand led by easing lockdowns and vaccination drives eclipsed fresh virus outbreaks and port delays. But overall trade growth in the world"s second-biggest economy may slow in the second half of 2021, a customs official warned last month. "Export growth has likely slowed further in July both in year-over-year and month-over-month terms...Korea also reported weaker growth of imports from China. A typhoon around Yangtze River Delta might have also reduced total trade growth in the month due to port disruptions," said analysts from Goldman Sachs in a note. Exporters are grappling with higher freight costs and lingering logistics bottlenecks. The acceleration in Delta-variant coronavirus outbreaks in several countries, coupled with natural disasters, has put huge pressure on global supply chains and slowed global container turnaround times. Container shipping rates from China to the United States have scaled fresh highs above $20,000 per 40-foot box amid rising retailer orders ahead of the peak year-end U.S. shopping season. read more China reported on Friday its highest daily count for new coronavirus cases in its current outbreak at 124, fuelled by a surge in locally transmitted infections in a growing number of cities. read more "The next two weeks would be critical to see whether (China is) still effective in dealing with the Delta variant. In any case, consumption, especially summer tourism, is under heavy pressure," Larry Hu from Macquarie Capital Limited said in a note. China"s factory activity expanded in July at the slowest pace in 17 months as higher raw material costs, equipment maintenance and extreme weather weighed on business activity, adding to concerns about a slowdown in the world"s second-biggest economy. read more The trade surplus is expected to be $51.54 billion in July, from $51.53 billion in June, the poll showed. The data will be released on Saturday.