Tenders Are Invited For Delivery Of 75 Tons Of Steel Balls, According To Specifications in Bulgaria

Work Detail

The Boilers In Toplofikatsia Ruse Are Equipped With Mill Systems With An Intermediate Dust Hopper. Grinding Of The Fuel - Coal Takes Place In Drum - Ball Mills Using Grinding Bodies - Balls. 1. General Requirements Material - Steel. Method Of Production - Rolled. Size – Ø 60 Mm, Limit Deviations “+3”, “-2” Mm. 2. Technical Requirements. Steel Balls Are Produced In Accordance With The Requirements Of Standard Bds 2798-84 Or Equivalent. The Steel Balls Shall Be Of Carbon Steel With The Following Chemical Composition: With 0.7÷0.85 Mn 0.7÷1.2 Si 0.3÷0.5 P To 0.035 S To 0.035 Cr 0.3÷0.45 Mo 0.1÷0.3 Hardness – The Hardness Of The Balls After Heat Treatment Must Be Hrc/Hb –56÷58/ 578÷624 Across The Entire Cross-Section Of The Bodies No Defects Are Allowed On The Surface Of The Balls, Which Take The Dimensions Outside The Limit Deviations Specified In The General Requirements Fragility - No Higher Than 1%.

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