Description
C55 Round Bars / EN9 Round Bars
C55 Round Bars is an unalloyed Medium Carbon Steel which has 0.52 % – 0.60 % Carbon as per standard. It will obtain high hardness and high strength after hardening due to the relatively high carbon content, and also can be flame or induction hardened to surface hardness Min 58 HRC. C55 Round Bar steel is generally supplied in an untreated or normalised condition.
We Textron Steel & Alloys stock material from various mills.
We also have JSW Coils in small diameters and Round Bars in big diameters.
Currently we have C55 – JSW Steel Ltd. Make in 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 170mm, 180mm, 190mm, 200mm Diameter.
For more sizes and availability please contact us.
C55 / EN9 Round Bar Supply Form & Size :
- • Hot Rolled Round Bar : Φ 20 – Φ 200mm, Length:3000-6000 mm
- • Hot Forged Round Bar : Φ 80 – Φ 1000mm, Length:3000-10000 mm
Chemical Composition of C55 / EN9 Round Bars :
| Grade | C55 / 1.0535 |
| C | 0.52 – 0.60 |
| Mn | 0.60 – 0.90 |
| P | ≤ 0.045 |
| S | ≤ 0.045 |
| Si | ≤ 0.40 |
| Cr | ≤ 0.40 |
| Mo | ≤ 0.10 |
| Ni | ≤ 0.40 |
| Cr+Mo+Ni | ≤ 0.63 |
Equivalent Standards :
| USA | 1055 |
| UK | 070M55 / EN9 |
| China | 55# |
| Japan | S55C |
| Australia | 1055 |
C55 Round Bar Applications :
C55 / EN9 Round Bar is suitable for engineering applications which require higher strength and wear resistance. Typical applications include : shafts, axes, knives, bushes, crankshafts, screws, sprockets ,springs, cylinders, cams,sickles, wood working drills,small gears, machine tools, keys and hammers.
Heat Treatment For C55 Steel :
Normalizing – The normalizing temperature range for this grade is typically 820-880ºC,followed by cooling in still air.
Annealing – Heat slowly to 680-710°C, soak well. Cool slowly in the furnace.
Hardening – Hardening of this grade is carried out from an austenitizing temperature of 820-850ºC followed by oil or water quenching.
Tempering – Carbon steel C55 or EN9 or 070M55 can be tempered at a heat of between 550°C to 660°C,heating for about 1 hour for every inch of thickness, then cool in oil or water.
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