Increasingly cheap Chinese steel is concern for Europe-Eurofer

* Early evidence of China steel (Taiwan: 2002.TW - news) firms jumping on devaluation

* Some firms have cut export prices-sources

* Tough competition getting tougher for European groups-Eurofer

* Some companies see buffers for impact of cheap Chinese steel (Adds comment from German steel federation in paragraphs 6 and 7)

LONDON/FRANKFURT/VIENNA, Aug 13 (Reuters) - Increasingly unfair competition from cheap Chinese exports is a concern for European steel companies, Europe's steel industry body Eurofer said on Thursday, after Chinese steel producers cut export prices.

Chinese makers cut prices in response to Beijing's move to weaken the yuan, industry sources have said, providing an indication of how Beijing's devaluation will help companies in the world's second-biggest economy boost sales.

"There may be very real competitiveness impacts for European steel firms facing Chinese steel imports, which will now be even cheaper today," Eurofer said in an emailed statement.

It added that Europe was not shielded well enough against being swamped with Chinese overcapacity, exacerbated by the country's slowing economy.

"(China) now has an installed capacity of 1.1 billion tonnes, of which 340 million tonnes is excess capacity. This overcapacity alone is more than double the EU's steel demand."

Separately the German Steel Federation said the devaluation pointed to deeper structural problems in China.

"It supports our fear that Chinese steel exports will remain at excessively high levels and therefore continue to threaten the recovery on the European steel market and in other parts of the world," it said in a statement.

Eurofer, whose members include top global steelmaker ArcelorMittal (Other OTC: AMSYF - news) , as well as the likes of ThyssenKrupp (Amsterdam: TH6.AS - news) and Voestalpine (Xetra: 897200 - news) , estimates Chinese exports to the EU rose 49 percent year-on-year over the first five months of 2015.

UNFAIR COMPETITION

"China currently sells its excess steel to the EU market at prices that do not fully cover its costs for raw materials or for material transformation," Eurofer said. "The overnight devaluations of the Chinese currency merely add to the unfair competition faced by the European steel industry. "

Global steel prices (ST-CRU-IDX) are at their lowest level in about a decade, according to an index compiled by consultants CRU. China's sales to overseas markets reached 62.13 million tonnes in the year to July, already two-thirds of last year's record 94 million tonnes.

The EU has this year taken some measures to protect domestic steelmakers, including its imposition in March of anti-dumping duties on imports of cold-rolled flat stainless steel from China and Taiwan.

Some European companies, meanwhile, pointed to mitigating effects of the rising export pressure from China.

The chief financial officer of ThyssenKrupp (Xetra: 750000 - news) said Chinese producers' ability to drag world steel prices down further in light of the yuan devaluation would be limited by the necessity of buying raw materials in dollars, and high transport costs.

ThyssenKrupp makes 6 percent of its revenue in China and about a quarter of its sales from steel.

"I do note that China is acting to stimulate demand. I find this in itself positive and it underlines our view of China's promising prospects," Guido Kerkhoff told reporters on a conference call.

Voestalpine Chief Executive Wolfgang Eder, also chairman of the World Steel Association, said cheap steel from China was not a threat to his own company due to its focus on highly specialised industrial goods made of steel, rather than the underlying commodity. (Reporting by Maytaal Angel in London, Georgina Prodhan in Frankfurt and Shadia Nasralla in Vienna; Editing by William Hardy and David Holmes)