Equivalent Grade : 100 Cr 6 ; ISO 683-17,
TYPE ;1999 STEEL TYPE B 1; EN 10027-2 1.3505, ASTM A 295-98
52100; JIS SUJ 2.
The process route is designed to focus
on the steel refining quality,fully killed with Oxygen content
less than 10 PPM generally.
Inclusion counts –(MAX)
A TYPE
2 THIN
1.5 HEAVY
B
1.5
0.5
C
0.0
0.0
D
1.0
0.5
Applications :
The steel is manufactured thro Route –EAF-LF-VD-Continuous Cast blooms –rolled in bars—spheroidised annealed—straightened—surface defect inspection & internal defect detection/rectification.
The bars used for forgings / machining Bearing races –under approval of SKF Bearings India Ltd.
Workability :
Forging-Hot working temp 1150 to 1180 deg C. ,subsequently spheroidised annealed
And machined in to races.
A good spheroidised microstructure controlled to CG 2.0 to 2.3,PA 3.1 max CZ 7.4 max as per Stahl –Eisen-Prufblatt 1520-98
Hardness 170 to 210 BHN.
Heat-treatment :
Races Through hardened at 850 deg C in protective atmosphere ,oil quenched-and tempered at 170 deg C to get Hardness HRC 62 to 64.
