A286(1.4980,1.2779)Electromagnetic Stirrer(EMS) Roller Rolls For continuous casting plants
These days we produce some A286(1.4980,1.2779)Electromagnetic Stirrer(EMS) Roller Rolls For continuous casting plants
Material grade of Electromagnetic Stirrer(EMS) Roller Rolls For continuous casting plants is A286 or 1.4980 or 1.2779 following is technical requirement of our clients
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Material Characteristics of Electromagnetic Stirrer(EMS) Roller Rolls For continuous casting plants
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Chemical Characteristics |
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%C |
0,08 |
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Heat Treatment |
Annealed, Volume Hardened & Tempered |
%Si |
0.40 -1.00 |
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Tensile strength |
600 N/mm2 |
%Mn |
1.00-2.00 |
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Yield Point (min) |
440 N/mm2 |
%P+S (max.) |
0.03 |
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Elongation at fracture |
16 % (longit.) 14 % (transv.) |
%Cr |
13.5-16.7 |
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Notch impact energy AV (DVM) in J at 20° |
35J (axial),32J (transv) ,percentage brittle fracture<70% ,Mean value out of three specimen,smallest individual value ≥ 70% |
%Ni |
24.0-27.0 |
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%Mo |
1.00-1.50 |
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%AL |
<0.35 |
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Hardness HV30 |
290 - 384 |
%V |
0.10-0.50 |
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Route of manufacturing of Steel |
EAF/IF>LRF>VD>Bottom Poured Ingot (Ingot should be slow cooled; either pit cooled or mould cooled) |
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Gas Content |
H2 : 3 ppm (max.) ; N2 : 70 ppm (max); O2 : 50 ppm (max.) |
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Reduction ratio |
4:1 (min) |
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Grain size index |
≥ 6 as per DIN 50601:1985-08 |
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Degree of purity |
DIN 50602 : 1985-09 .All non-metallic inclusions: size characteristic max. 4 |
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Heat Treatment of Electromagnetic Stirrer(EMS) Roller Rolls For continuous casting plants |
Upon premachining, the rollers are individually solution-annealed and cooled in liquid. Hardening can take place immediately afterwards or after finish-machining. The dividing up of the bars in individual rollers can take place after the heat treatment. To keep the degree of distortion low, the rollers must be preferably in vertical position during the heat treatment. |
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Notched bar impact bending test DIN10002,charpy impact test DIN10045 |
At least 1 tensile test and 1 set of charpy impact test for each rollers, heat treatment batch and diameter. |
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Hardness Test |
Hardness test to be carried out in 50% of all forgings |
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Markings of finished Electromagnetic Stirrer(EMS) Roller Rolls For continuous casting plants |
Appropriate identification shall be provided to ensure the traceability of the material. After forging each roller is to be provided with a series roller number in the place stated on the drawing. This roller number is to be transferred to the finished roller. The assignment to the heat and the heat treatment must always be possible. |
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Testing Instructions |
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Non-destructive testing : |
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Internal condition of the finished part : Ultrasonic testing acc. To DIN EN 10228-3:1998-07 |
Test group |
Quality class |
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On the entire workpiece |
Surface zone=1/3 D max. 100 m thick |
100% |
4 |
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Core zone = remaining section |
100% |
3 |
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Note for Machinist of finished Electromagnetic Stirrer(EMS) Roller Rolls For continuous casting plants
1. The critical dimensions are bores/grooves for bearing , labyrinth ring & circlipseating. Bores at both ends should be co axial and concentric with outer diameter within +/-0.02 mm.
2. All bore sizes should be maintained to +0.02 mm. So a roll having any bore to 0.00 mm will be rejected.
3. GO-NOGO gauges to check diameter of through bore (longest bore).
4. Co-axiality of bores
Quality documentation of finished Electromagnetic Stirrer(EMS) Roller Rolls For continuous casting plants
i. Chemical composition of each heat included in the supply (verification of original mill test certificate).
ii. Heat treatment data with indication of the series roller number per heat treatment unit ( during hardening & tempering).
Iii. Values of tensile and charpy impact tests. Iv. Results of hardness test
v. Results of non-destructive tests
vi. Results of grain size determinations and degree of purity vii. Results of the dimensional inspection
