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Grade Introduction:

EN9 carbon steel is a medium carbon steel grade commonly supplied in the as-rolled condition. It can be flame or induction hardened to produce a high surface hardness with excellent wear resistance for a carbon steel grade. EN9 bar is available in full lengths or can be cut to your requirements. EN9 carbon round steel bar flame cut steel plates can be supplied cut to your required sizes and normalized. Flame cut plates can be supplied Lumsden ground or precision ground.

Grade Application:

EN9 is used commonly for many general engineering applications. Typical applications include shafts, axes, knives, bushes, crankshafts, screws, sickles, woodworking drills, 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, OHNS, HCHCR, D2, D3, H-11, H-13, CW-1, 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:

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

Hardness:

Heat Treatment:

Heat treatment temperatures, including the rate of heating, cooling, and soaking times will vary due to factors such as the shape and size of each EN9 steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium, and workpiece transfer facilities.

Hardening:

Heat slowly to 820-840°C and allow it to be heated through. Quench in oil, brine, or water.

Tempering:

Temper the EN9 steel component immediately after quenching whilst still hand warm. Re-heat to the tempering temperature then soak for one hour per 25 millimeters of total thickness (2 hours minimum) Cool in air. For most applications tempering of EN9 will be between 550-660°C.

Physical Properties

Thermal Properties

Forging Properties:

Preheat the component carefully, then raise the temperature to 1100°C for forging. Do not forge below 850°C. After forging cool slowly, preferably in a furnace.

Stress Relieving:

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.

Density:

Machinability

Welding:

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