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

3.Chemical Composition

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

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.