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Grade Introduction:
En9 round bar is also known by its trade name  070M55. The carbon content in the alloy of an en9 bright bar ranges between 0.5 – 0.6%, thus making this grade a medium carbon steel alloy. The tensile strength of the en9 steel rod could be developed between 500 Mpa – 800 Mpa.
 
Grade Application:
Typical applications for the en9 flat bar include its use in the production of shafts, woodworking,  axes, knives, crankshafts, screws, bushes, sprockets, springs, cams, cylinders, sickles, drills as well as small gears, machine tools, keys and hammers.
 
Equivalent grades:
BS 970 1991
BS 970 1955 EN
AISI/SAE
Werksoff
070M55
EN9
1055
1.0535
 
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.
 
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Chemical composition:
The following table shows the chemical composition of EN9 steel:
Element
C
Si
Mn
P
S
Cr
Content(%)
0.50-0.60
0.4 Max
0.50-0.80
0.035 Max
0.015-0.035
0.30 Max

Mechanical Properties:
UTS in N/mm, hot rolled or normalized, min.:705 (72 kg/mm2)
Elongation %, hot rolled or normalized, min: 13
UTS in N/mm, hardened and tempered, min. *:775 (79 kg/mm2)
Elongation %, hardened and tempered, min: 13
*(Limiting ruling section = 30mm)
 
Hardness:
180 HB to 230 HB
 
Heat treatment: 
 
Hardening:
820-850ºC
 
Tempering:
550°C to 660°C
 
Physical Properties: 
 
Thermal Properties: 
 
Forging Properties:
Forging, rolling, etc. : 1150 oC, finishing > 850 oC
 
Stress Reliving: 
 
Normalizing:
810 – 840 oC, air cool
 
Annealing:
810 – 840 oC, furnace cool
 
Density: 
 
Machinability: 
 
Welding: 
 
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