☎ +91 22 6545 3400 ✉ [email protected]
EN8Mby Ambhe Ferro Metal Processors
Free-Cutting Medium-Carbon Steel · 212M36

EN8M Steel: Free-Cutting Medium-Carbon Bar for High-Volume Machined Parts

EN8M (212M36) is EN8 with sulphur added for free machining: medium-carbon strength with the chip-breaking and tool life of a free-cutting steel. Ambhe Ferro rolls it as rounds, bright bars and hexagons, with a heat-wise mill test certificate on every dispatch.

Request a Quote Call +91 22 6545 3400

EN8M at a Glance

Grade / standard
EN8M (BS 970 212M36), a free-cutting medium-carbon steel
Nominal composition
0.35–0.45% C, 1.00–1.30% Mn, 0.12–0.20% S (free-cutting), 0.25% Si max
Equivalents
AISI 1140 / 1146 · DIN 36SMn14 · BS 970 212M36
Supply condition
Hot rolled, normalised, annealed, or bright (cold drawn / turned & polished)
Product forms
Rounds, bright bars, hexagons, RCS
Typical uses
High-volume CNC-turned studs, bolts, shafts, spindles and pins needing machinability plus moderate strength
Ordering
MOQ 5 MT per size; standard length 5–6 m; mill test certificate on every heat

What is EN8M steel?

EN8M is a free-cutting, medium-carbon steel to BS 970 designation 212M36. It is EN8 with sulphur added (0.12 to 0.20%) for machinability, used where a part needs both good machinability and moderate strength.

The added sulphur combines with manganese to form fine manganese-sulphide inclusions throughout the steel. These inclusions break the chip into short pieces and lubricate the cutting edge, so EN8M cuts faster, draws less power and leaves a cleaner surface finish than plain EN8. For a machine shop running high volumes on CNC lathes or automatics, that means higher throughput and longer tool life.

Because its carbon sits at 0.35 to 0.45%, EN8M can also be heat treated to moderate strength, which low-carbon free-cutting grades such as EN1A cannot. The trade-off for the free-machining sulphur is lower transverse ductility, impact toughness and weldability than plain EN8 or close-control EN8D. EN8M therefore suits parts produced in volume on automatics that must carry moderate load. It is not the right grade for welded structures or highly stressed safety-critical parts.

EN8M chemical composition

Typical chemical composition of EN8M (212M36), % by weight
ElementEN8M (% by weight)
Carbon (C)0.35 – 0.45
Manganese (Mn)1.00 – 1.30
Silicon (Si)0.25% max
Sulphur (S)0.12 – 0.20 (added for machinability)
Phosphorus (P)0.06 max

Sulphur is deliberately high in EN8M, unlike plain EN8 where it is kept to 0.05% max. Exact analysis is confirmed on the heat-wise mill test certificate for every dispatch.

EN8M mechanical and physical properties

Typical mechanical properties (condition- and section-dependent)
ConditionTensile (MPa)Yield (MPa)Elong. (%)Hardness (HB)
As-rolled / normalised550 – 700330 – 45014 – 18152 – 217
Hardened & tempered (small sections)700 – 850480 – 60011 – 14201 – 255

Free-cutting sulphur reduces transverse ductility and impact toughness compared with plain EN8 or EN8D. Values vary with section size and heat-treatment condition and are confirmed on the mill test certificate.

Typical physical properties

Typical physical properties for medium-carbon steel
PropertyTypical value
Density~7.85 g/cm³
Modulus of elasticity~200 GPa
Thermal conductivity~50 W/m·K
Specific heat capacity~470 J/kg·K
Coefficient of thermal expansion~11.5 ×10⁻⁶ /K
Melting range~1450 – 1520 °C

What is EN8M equivalent to?

Nearest international equivalents to EN8M
StandardDesignation
BS 970212M36 (formerly EN8M)
AISI / SAE1140 / 1146
DIN / EN36SMn14
JISNo exact free-cutting equivalent (nearest plain grade: S40C)

Nearest matches only. Sulphur and manganese ranges differ slightly between standards, so confirm the exact grade and analysis against the mill test certificate.

Can EN8M be heat treated?

Yes. With 0.35 to 0.45% carbon, EN8M responds to heat treatment, though the free-cutting sulphur limits its toughness, so it is chosen mainly for machinability plus moderate strength rather than highly stressed hardened duty.

Typical heat-treatment temperatures for EN8M (°C)
OperationTemperature / medium
Forging1100 – 1250
Normalising850 – 880 (air cool)
Annealing840 – 870 (furnace cool)
Hardening850 – 880 (oil quench for sections; water risks cracking)
Tempering550 – 660

Quench complex shapes in oil rather than water to avoid cracking, and temper immediately after hardening. EN8M also takes induction or flame hardening on wear surfaces.

What sizes and forms of EN8M are available?

Rounds (Hot Rolled)

23.5 mm – 80 mm diameter

Bright Bars

22 mm – 63.5 mm (cold drawn / turned & polished), the usual form for free-cutting turned parts

Hexagons

23.5 mm – 52.5 mm across flats, common for fasteners and fittings

RCS

55 mm, 63 mm, 75 mm

Non-standard sizes available make-to-order. Standard length 5–6 m, custom cut lengths on request or multiples thereof. MOQ 5 MT per size.

Applications of EN8M

EN8M suits high-volume machined parts that also need moderate strength, where pure free-cutting grades are too soft and plain EN8 machines too slowly:

  • CNC-turned and automatic-lathe components: studs, bolts, pins, spindles, shafts and bushes
  • Fasteners and fittings where machinability and moderate strength both matter
  • Automotive components and general engineering parts produced in volume
  • Machined components with tight surface-finish and dimensional requirements
  • Hydraulic and pneumatic parts, couplings, levers and links

Choose EN8M over EN1A when the part must carry moderate load, and over plain EN8 when machinability and finish are the priority.

Why source EN8M from Ambhe Ferro

  • We roll it, we don't just stock it. Heat-to-heat consistency from our own rolling mill and bright-bar lines.
  • ISO 9001 certified with an in-house QC laboratory testing every heat.
  • Heat-wise mill test certificate on every dispatch; third-party inspection (SGS, BV, TUV) on request.
  • Multiple supply conditions — hot rolled, annealed, normalised, and bright (cold drawn / turned & polished).
  • Over 39 years serving the Mumbai–Pune–Nashik corridor, with quick dispatch from locations near JNPT.

EN8M steel supplier in Mumbai and across India

Ambhe Ferro is an EN8M (212M36) manufacturer and supplier based in Mumbai. We roll and finish the grade at our units near JNPT and dispatch quickly across the Mumbai–Pune–Nashik corridor and pan-India.

We regularly supply EN8M to buyers in Mumbai, Navi Mumbai, Thane, Vasai–Virar, Pune, Pimpri-Chinchwad, Chakan, Nashik, Aurangabad, Ahmednagar, Rajkot, Ahmedabad, Nagpur, Kolhapur and Bengaluru, and export on request. Order EN8M as hot-rolled rounds, bright bars, hexagons or RCS against your size and tonnage, with a mill test certificate on every heat.

How to order EN8M

Ordering and supply terms
TermDetail
Minimum order5 MT per size
Length5–6 m standard; custom cut lengths on request or multiples thereof
Supply conditionsHot rolled, annealed, normalised, bright (cold drawn / turned & polished)
DocumentationHeat-wise mill test certificate; third-party inspection (SGS, BV, TUV) on request
DispatchFrom Mumbai, near JNPT, across the Mumbai–Pune–Nashik corridor and pan-India

Send your size, form, condition and tonnage through our quotation form for pricing, availability and lead time.

EN8M — frequently asked questions

What is EN8M steel?
EN8M is a free-cutting, medium-carbon steel to BS 970 designation 212M36. It is essentially EN8 with sulphur added (0.12 to 0.20%) to improve machinability. The sulphur forms manganese-sulphide inclusions that break chips and lubricate the cut, so EN8M machines faster and cleaner than plain EN8 while still offering medium-carbon strength after heat treatment.
What is EN8M equivalent to?
EN8M corresponds to BS 970 212M36, AISI/SAE 1140 or 1146, and DIN 36SMn14. There is no exact JIS free-cutting equivalent; the nearest plain medium-carbon Japanese grade is S40C. These are nearest matches, as sulphur and manganese ranges differ slightly between standards. Ambhe Ferro confirms the exact analysis on the heat-wise mill test certificate.
What is the difference between EN8 and EN8M?
EN8 and EN8M share the same medium-carbon base, around 0.40% carbon. The difference is sulphur: EN8M carries 0.12 to 0.20% sulphur, deliberately added for machinability, while plain EN8 keeps sulphur to 0.05% max. EN8M therefore machines faster with longer tool life and better chip control, but has lower transverse ductility, impact toughness and weldability than EN8 or EN8D.
Can EN8M be hardened?
Yes. With 0.35 to 0.45% carbon, EN8M responds to through-hardening in smaller sections and to surface methods such as induction or flame hardening. It is normally hardened from 850 to 880°C, quenched in oil for sections (water risks cracking), and tempered at 550 to 660°C. The free-cutting sulphur lowers toughness, so EN8M suits moderate-strength duty rather than highly stressed hardened parts.
Is EN8M weldable?
EN8M is not recommended for welded assemblies. Both its medium carbon content and its added sulphur reduce weldability and raise the risk of cracking and porosity. Where welding is unavoidable, preheat, use low-hydrogen consumables and stress-relieve afterwards. If a part must be welded, a low-carbon or low-sulphur grade such as EN8D is usually a better choice than EN8M.
Why is EN8M easier to machine than EN8?
The added sulphur in EN8M forms fine manganese-sulphide inclusions through the steel. These inclusions break the chip into short pieces and act as an internal lubricant at the cutting edge. The result is higher cutting speeds, longer tool life, lower power draw and a cleaner surface finish, which is why EN8M is preferred for high-volume turned parts on CNC machines and automatics.
What is the carbon content of EN8M?
EN8M contains 0.35 to 0.45% carbon, the same medium-carbon range as EN8. This is what allows it to be heat treated to moderate strength, unlike low-carbon free-cutting grades such as EN1A (around 0.07 to 0.15% carbon) which cannot be meaningfully hardened. Manganese runs 1.00 to 1.30% and sulphur 0.12 to 0.20%. Exact values are confirmed on the mill test certificate.
What forms and sizes does Ambhe Ferro supply EN8M in?
Ambhe Ferro supplies EN8M as hot-rolled rounds (23.5 to 80 mm diameter), bright bars (22 to 63.5 mm, cold drawn or turned and polished), hexagons (23.5 to 52.5 mm across flats) and RCS (55, 63 and 75 mm). Standard length is 5 to 6 metres, with custom cut lengths on request or multiples thereof. Non-standard sizes are available make-to-order, subject to a 5 MT minimum per size.
Should I choose EN8M or EN1A?
Choose EN8M when the part needs medium-carbon strength as well as machinability, since EN8M can be heat treated. Choose EN1A when machinability and cost are the priority and strength is secondary, for example light fittings, studs and pins, as EN1A is a low-carbon free-cutting grade that cannot be hardened. See our EN8M vs EN1A comparison for a full side-by-side.
What is the minimum order quantity for EN8M?
Ambhe Ferro's standard minimum order quantity for EN8M is 5 MT per size. Pricing depends on size, form, condition and tonnage, and every dispatch carries a heat-wise mill test certificate. Send your size, form and quantity through our quotation form for pricing, availability and lead time.
Where can I buy EN8M steel in Mumbai?
Ambhe Ferro manufactures and supplies EN8M (212M36) directly from its units near JNPT in Mumbai and dispatches across Maharashtra and pan-India. Send your size, form and tonnage through our quotation form for pricing, availability and lead time, or call +91 22 6545 3400.
Does Ambhe Ferro supply EN8M as bright bar, round and hexagon?
Yes. Ambhe Ferro supplies EN8M as hot-rolled rounds (23.5 to 80 mm), bright bars (22 to 63.5 mm, cold drawn or turned and polished), hexagons (23.5 to 52.5 mm across flats) and RCS, in hot rolled, annealed, normalised or bright condition, with a mill test certificate on every heat.
What is the price of EN8M steel?
EN8M pricing depends on size, product form, condition, tonnage and the prevailing steel market, so it is quoted per enquiry rather than listed. Send your requirement through our quotation form for a current EN8M price, availability and lead time.

Let's Talk EN8M

Tell us your grade, form, size, and tonnage. We'll respond with pricing, availability, and lead time, and a mill test certificate on every heat.

Request a Quotation Email [email protected]