Properties of C55 grade cold rolled annealed steel
strips /
Chemical
composition by weight
Carbon |
0.75 - 0.85% |
Manganese |
0.60 - 0.90% |
Silicon |
0.0-0.35% |
Sulphur |
0.025% |
Phosphorous |
0.025% |
This grade is similar to 80c6 of IS2507
of 1975 & C1080
Physical properties
- Hardness is annealed condition 200Hv Max
- Yield strength 290 N/MM2
- Elongation 25% Minimum
- Tensile strength 640N/mm2
- Surface bright and free from any detrimental surface defect
- Edges Clean slit
Bend Test: Strips shall pass bend test as recommended below
• Bend test When bending maintain radius as follows :
|
Grain Wise |
Against Grains |
For thickness 4.00 mm to 2.50 mm |
r=2t |
not advised |
For thickness 2.30 mm to 1.20 mm |
r=1t |
not advised |
For thickness 1.0 mm to 0.50 mm |
r=0t |
r=1t |
For thickness 0.45 mm to 0.20 mm |
r=0t |
r=0r |
'r' stands for radius of bend and 't' for thickness
of strip. Other
Properties
Form of Supply
Usually in coils, thicker strips can also be supplied in cut to length and
levelled
strips
Edges are slitted
Coil ID 300-500mm as per mutual agreement with buyer
Coil weight as per mutual understanding with buyer
Surface finish is bright suitable for electroplating