Charng was born in Nakhon Si Thammarat province, when he grew up, he went to secondary school at Suankularb Wittayalai School in Bangkok.
Later, he received a scholarship to study for a doctorate in science at the University of Jena.
[citation needed] He was the first to develop iron smelting techniques in Thailand, for the Siam Cement Company, where he served on the board of directors.
He made multiple business ventures, the most significant of which is the Siam Chemicals Company, which grew from a capital of 12 million baht in 1959 to be worth over one billion by the 1990s.
This Thai biographical article is a stub.