THIS GRADE OF STEEL IS POPULARLY KNOWN AS ANNEALED SPRING STEEL STRIP, UNHARDENED SPRING STEEL STRIP, HIGH CARBON STEEL STRIP, COLD ROLLED STEEL STRIP.
C80 is a High Carbon cold rolled steel strip with a Spherodized grain structure. This grade of steel has a
very high yield strength. It allows objects made of this steel to return to their original shape despite
significant bending or twisting after hardening and tempering.
It is usually available in soft annealed condition however it can be supplied in temper rolled hardness in
the range of 200-350 Hv (band range of +/- 40 Hv). This grade of steel is used where fatigue value and
elastic limits are critical. It is also used where high strength, hardness and resistance is needed. This
steel has great forming and blanking properties however lacks drawing properties.
| Properties of C80 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% |
| Physical Properties of C80 grade cold rolled annealed steel strips | |
|---|---|
| HARDNESS IN ANNEALED CONDITION | 200Hv Max |
| YIELD STRENGTH | 290 N/MM2 |
| ELONGATION | 25% Min |
| TENSILE STRENGTH | 640N/mm2 |
| Bend test When bending maintain radius | ||
|---|---|---|
| THICKNESS | 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 |
| . |
|---|
| 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 |
| . | . | . |
|---|---|---|
| 4.50mm + 0.07mm | 3.50mm + 0.05mm | 3.20mm + 0.05mm |
| 2.80mm + 0.05mm | 2.60mm + 0.04mm | 2.50mm + 0.04mm |
| 2.30mm + 0.04mm | 2.00mm + 0.04mm | 1.80mm + 0.04mm |
| 1.75mm + 0.04mm | 1.50mm + 0.03mm | 1.48mm + 0.03mm |
| 1.20mm + 0.03mm | 1.0mm + 0.03mm | 0.98mm + 0.03mm |
| 0.90mm + 0.03mm | 0.80mm + 0.03mm | 0.70mm + 0.03mm |
| 0.60mm + 0.03mm | 0.50mm + 0.02mm | 0.45mm + 0.02mm |
| 0.55mm + 0.02mm | 0.40mm + 0.02mm | 0.30mm + 0.02mm |
| 0.25mm + 0.02mm | 0.20mm + 0.02mm | |
| . | . |
|---|---|
| FLAT SPRINGS | CIRCLIPS |
| DOWEL PINS | WAVE WASHERS |
| BELLEVILLE WASHERS | VARIOUS TYPES FASTENERS |
| CHAIN PARTS | CLIPS |
| AUTOMOTIVE CLUTCH PLATES | HORN DIAPHRAGM |
| CUTTING BLADES & GAUGES | AGRICULTURAL IMPLEMENTS |
| TEXTILE PARTS | HOSE CLIPS |
