En9 Carbon Steel Round Bar
EN9 Carbon steel round barEN9 Carbon steel is a medium carbon steel with 0.5-0.6% C as per BS 970 standard.It is also known as 070M55 with tensile strength between 500-800Mpa.EN9 steel is generally supplied in untreated condition or in the normalized condition.This material can be flame or inducti......
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Product Description
EN9 Carbon steel is a medium carbon steel with 0.5-0.6% C as per BS 970 standard.It is also known as 070M55 with tensile strength between 500-800Mpa.EN9 steel is generally supplied in untreated condition or in the normalized condition.This material can be flame or induction hardened to produce a high surface hardness with excellent wear resistance .When hardened and tempered, it develops a tensile strength in the range 700-1000 N/mm depending on ruling section.
1.EN9 steel Supply Form & Size
Hot rolled round bar:Φ20-Φ200mm,Length:3000-6000mm
Hot Forged round bar:Φ80-Φ1000mm,Length:3000-10000mm
Flat bar/Blcoks:Thickness :120-800mm xWidth:120-1500mm,Length:2000-6000mm
2.Surface Finish&Tolerance
| Surface Finish | Black-Forged | Black-Rolled | Turned | Grinding | Polished | Peeled | Cold Drawn |
| Tolerance | (0,+5mm) | (0,+1mm) | (0,+3mm) | Best h9 | Best h11 | Best H11 | Best H11 |
3.Chemical Composition
| Grade | C | Mn | P | S | Si |
| EN9/070M55 | 0.5-0.6 | 0.50-0.9 | ≤ 0.05 | ≤ 0.05 | 0.1-0.4 |
4.Related Specifications
- BS 970-1991:070M55
- AISI/ASTM A29:1045,1050,1055,1060
- DIN Werkstoff No.: 1.0535,1.1209
- BS & DIN European:C45, CK45,C50,C55,CK55
- JIS G4051: S45C, S50C,S55C
5.Mechanical Property
| Condition | N | R | S | T |
| Ruling Section,mm | 254 | 100 | 65 | 20 |
| Tensile Strength,Mpa | 600-700 | 690-850 | 770-930 | 850-1000 |
| Yield Strength,Mpa | ≥310 | ≥415 | ≥480 | ≥570 |
| Elongation | 13% | 14% | 14% | 12% |
| Hardness,HBW | 201-255 | 201-255 | 223-277 | 248-302 |
6.EN9 steel Forging
Forging temperature:850-1100ºC,EN9 steel should be cooled as slowly as possible in still air or in sand after forged.
6.Heat Treatment
- 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 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.
7.Application
EN9 steel 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.
