Tafarnaubach and Cross Keys in South Wales," it added.
In addition, shift levels at the company's Rotherham and Hartlepool operations will be reduced to match production to lower demand for bar products and pipelines.
Kohler said that apart from support to local steel communities through subsidiary UK Steel Enterprise, "we will strengthen this work with a further 650,000 pound to help them create new jobs in affected areas".
UK Steel Enterprise has teams in all the affected locations who, for almost four decades, have helped to regenerate local economies and create 70,000 new jobs in the UK, he said.
"We will do everything we can to reduce the impact of the proposals on employees and, where possible, we will look to achieve job losses through voluntary redundancies," he added.
Michael Leahy, General Secretary of the Community trade union and Chair of the trade unions Steel Committee, said: "We will be seeking an urgent meeting with the company to ensure our principle of no compulsory redundancies is upheld...".
Terming the proposed job losses as "symptomatic of the continuing failure of the Government's economic policy," he said the union has called on the British government to take urgent action to stimulate economic growth and help revive the manufacturing sector.
The announcement follows downturn in the UK and European steel industry, where the fall in UK steel demand has been steeper than in any other major European economy.