SION – Standards of Input Output Norms – Valve Seat Insert made of Alloy Steel of following Composition:-(i) Chromium 2, 4-4.8%, (ii) Molybdenum 0.36-0.72%, (iii) Tungston 0.5%, (iv) Nickel: 1.5-4.5%, (v) Cobalt: 1.6%, (vi) Boron: 0.3%, (vii) Iron and Carbon: Balance – SION – C1658 Valve Seat Insert made of Alloy Steel of following Composition:- (i) Chromium 2, 4-4.8%, (ii) Molybdenum 0.36-0.72%, (iii) Tungston 0.5%, (iv) Nickel: 1.5-4.5%, (v) Cobalt: 1.6%, (vi) Boron: 0.3%, (vii) Iron and Carbo
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