EN9 – BRIGHT BAR 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.

EN9 – BRIGHT BAR 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.

EN9 – BRIGHT BAR Equivalent grades:

BS 970 1991	BS 970 1955 EN	AISI/SAE	Werksoff
070M55	EN9	1055	1.0535

EN9 – BRIGHT BAR 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

 

EN9 – BRIGHT BAR Mechanical Properties:

UTS in N/mm² , hot rolled or normalized, min.:705 (72 kg/mm²)

Elongation %, hot rolled or normalized, min: 13

UTS in N/mm² , hardened and tempered, min. *:775 (79 kg/mm²)

Elongation %, hardened and tempered, min: 13

*(Limiting ruling section = 30mm)

EN9 – BRIGHT BAR Hardness:

180 HB to 230 HB

EN9 – BRIGHT BAR Hardening:

820-850ºC

EN9 – BRIGHT BAR Tempering:

550°C to 660°C

EN9 – BRIGHT BAR Forging Properties:

Forging, rolling, etc. : 1150 ^oC, finishing > 850 ^oC

EN9 – BRIGHT BAR Normalizing:

810 – 840 ^oC, air cool

EN9 – BRIGHT BAR Annealing:

810 – 840 ^oC, furnace cool