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steelguang on 23 May 18ASME SA203 is a kind of Ni-alloy steel material used to fabric high-temperature pressure vessels. ASME SA203 this property is based on it's Ni composition.SA203 is used in fabricators serving industry, especially in the oil, gas and chemical supply markets. ASME SA203 has five grades or levels-- Grade A/B/D/E/F.