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Steel FeMn HC-FeMn78C8.0

Grade · default condition

ASTM A99 · GB FeMn78

Bulk workhorse for deoxidation/Mn alloying of carbon and low-alloy steels and cast iron where carbon pickup is acceptable.

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Quote a part in FeMn HC-FeMn78C8.0FeMn overview

Values for the HC-FeMn78C8.0 condition

Other FeMn tempers and conditions

FeMn is listed in 11 conditions; see the grade overview at FeMn.

Compare all 11 conditionsHide
Condition · open for datasheetBest forYield MPaTensile MPaElong. %HardnessConductivity
N-FeMn
Nitrided ferromanganese
Use when nitrogen and manganese must be added together, e.g. N-alloyed stainless, duplex and high-strength steels.—80049 HRC0.9 % IACS
HC-FeMn78C8.0DefaultThis page
FeMn78C8.0
Bulk workhorse for deoxidation/Mn alloying of carbon and low-alloy steels and cast iron where carbon pickup is acceptable.—120058 HRC1.4 % IACS
HC-FeMn74C7.5
FeMn74C7.5
Slightly lower Mn/C high-carbon grade, common where feedstock ore grade or price favours it.—125057 HRC1.5 % IACS
HC-FeMn68C7.0
FeMn68C7.0
The most traded Chinese HC grade (Mn 65 %) for ordinary carbon steel and foundry use.—130056 HRC1.6 % IACS
HC-FeMn64C7.0
FeMn64C7.0
Lowest-Mn standard HC grade; cheapest Mn units for low-spec steel and grey iron.—135055 HRC1.6 % IACS
LC-FeMn82C0.7
FeMn82C0.7
Intermediate grade bridging medium- and low-carbon ferromanganese.—150041 HRC1.3 % IACS
MC-FeMn78C2.0
FeMn78C2.0
Economical medium-carbon grade for general alloy steel ladle additions.—1600.551 HRC1.4 % IACS
MC-FeMn82C1.5
FeMn82C1.5
Choose when Mn must be added late with limited carbon pickup, e.g. medium-carbon and alloy structural steels.—1700.549 HRC1.3 % IACS
ULC-FeMn88C0.1
FeMn88C0.1
Premium grade for ultra-low-carbon, stainless and high-purity steels; highest price per Mn unit.—1800.530 HRC1.2 % IACS
LC-FeMn84C0.4
FeMn84C0.4
Slightly cheaper low-carbon grade for low-C steels with a small carbon allowance.—2400.839 HRC1.3 % IACS
LC-FeMn88C0.2
FeMn88C0.2
For low-carbon, IF, stainless and electrical steels where carbon pickup must be minimal.—260136 HRC1.2 % IACS

What is FeMn HC-FeMn78C8.0?

FeMn HC-FeMn78C8.0 is FeMn in the HC-FeMn78C8.0 grade — bulk workhorse for deoxidation/Mn alloying of carbon and low-alloy steels and cast iron where carbon pickup is acceptable. FeMn HC-FeMn78C8.0 has a tensile strength of 120 MPa (17.4 ksi), weaker than 100% of steel grades. Elongation at break is 0% and the elastic modulus is 180 GPa (26.1 Msi). FeMn HC-FeMn78C8.0 has a density of 7.1 g/cm³ (0.257 lb/in³), lighter than 99% of steel grades. It melts at 1,240°C (2,264 °F).

Limitations

  • Limited ductility — 0%, worse than 100% of steel grades
  • Low fracture toughness — 3 MPa·√m (2.73 ksi·√in), worse than 100% of steel grades
  • Poor heat conductor — 9 W/m·K (5.2 BTU/hr·ft·°F), worse than 100% of steel grades
  • Low electrical conductivity — 1.4 % IACS, worse than 100% of steel grades
  • Difficult to machine — 5/100, worse than 100% of steel grades

FeMn HC-FeMn78C8.0 properties

Typical room-temperature values for FeMn HC-FeMn78C8.0; 22 are specific to this condition. Other listed values are FeMn reference data and may not represent this condition. Bars are the position among steel grades.

Physical3

FeMn HC-FeMn78C8.0 has a density of 7.1 g/cm³ (0.257 lb/in³), lighter than 99% of steel grades. It melts at 1,240°C (2,264 °F).

Density7.1 g/cm³0.26 lb/in³
Melting Point (Solidus)1,240°C2,264 °F
Liquidus Temperature1,280°C2,336 °F

Mechanical10

FeMn HC-FeMn78C8.0 has a tensile strength of 120 MPa (17.4 ksi), weaker than 100% of steel grades. Elongation at break is 0% and the elastic modulus is 180 GPa (26.1 Msi).

Elastic (Young's) Modulus180 GPa26.1 Msi
Tensile Strength (Ultimate)120 MPa17.4 ksi
Elongation at Break0%
Compressive Strength450 MPa65.3 ksi
Shear Strength90 MPa13.1 ksi
Fracture Toughness (K_IC)3 MPa·√m2.7 ksi·√in
Charpy V-Notch Impact (RT)2 J1.1 ft·lbf
Hardness, Brinell600 HB
Hardness, Rockwell C58 HRC
Hardness, Vickers650 HV

Thermal4

FeMn HC-FeMn78C8.0 is rated for continuous service to 400°C (752 °F). It conducts heat at 9 W/m·K (5.2 BTU/hr·ft·°F), worse than 100% of steel grades. Thermal expansion is 17 µm/m·K (9.44 µin/in·°F).

Thermal Conductivity9 W/m·K5.2 BTU/hr·ft·°F
Specific Heat Capacity520 J/kg·K0.12 BTU/lb·°F
Thermal Expansion (CTE, 20–100 °C)17 µm/m·K9.4 µin/in·°F
Max Service Temperature (continuous)400°C752 °F

Electrical3

FeMn HC-FeMn78C8.0 conducts electricity at 1.4 % IACS, worse than 100% of steel grades.

Electrical Conductivity1.4 % IACS
Electrical Resistivity1.2×10⁻⁶ Ω·m47.2 µΩ·in
Magnetic Responseweakly magnetic — high-Mn matrix is largely paramagnetic; response varies with C and Fe content

Chemical & Environmental3

Corrosion resistance is not recommended (6/100), worse than 100% of steel grades.

Galvanic Potential (seawater, vs SCE)-0.95 V
Corrosion ResistanceNot recommended6/100
Chemical Resistance SummaryVery reactive: rapidly attacked by dilute mineral acids with hydrogen evolution; oxidises and hydrolyses in humid air (fines can evolve H2/PH3 traces); must be stored dry and sealed.

Sustainability4

Producing a kilogram of FeMn HC-FeMn78C8.0 takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 5%.

Embodied Energy (primary production)30 MJ/kg12,898 BTU/lb
Embodied Carbon (primary production)2.2 kg CO₂/kg
Embodied Water40 L/kg4.8 gal/lb
Typical Recycled Content5%

Manufacturability4

FeMn HC-FeMn78C8.0's machinability is not recommended (5/100, worse than 100% of steel grades); weldability not recommended (5/100); formability not recommended (2/100).

MachinabilityNot recommended5/100
Machinability Rating (AISI 1212 = 100 %)5%
WeldabilityNot recommended5/100
Formability (cold)Not recommended2/100

Common Calculations4

Specific Strength (UTS / density)calculated17 kN·m/kg
Specific Stiffness (E / density)calculated25.4 MN·m/kg
Thermal Diffusivitycalculated2.4 mm²/s
Thermal Shock Resistance Indexcalculated0

Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.

Working with FeMn HC-FeMn78C8.0

Is FeMn easy to machine?

Not machined — hard and brittle; supplied crushed and screened (typically 10–50 mm lump, or 1–3 mm granules/powder for cored wire and briquettes).

Can FeMn be welded?

Not weldable; it is a melt addition, charged to the EAF/converter or added to the ladle stream, with Mn recovery typically 85–95 %.

Can FeMn be formed, bent or molded?

No cold or hot forming; product forms are cast/crushed lump, granules, briquettes and cored wire fill.

What surface finishes work on FeMn?

No surface finishing; keep dry and sealed to prevent oxidation and moisture-driven hydrogen/phosphine release from fines, and screen out dust before charging.

FeMn chemical composition (wt %)

Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.

ElementSpec limit (wt %)Nominal
MnFeMn78C8.0 per GB/T 3795 / ASTM A99 high-carbon class75 – 8278
Chigh-carbon class≤ 87
Sisub-grades at ≤1.0 / ≤1.5 / ≤2.0≤ 21
PP classes typically ≤0.20 / ≤0.25 / ≤0.33 / ≤0.38≤ 0.330.2
S≤ 0.030.02
Febalance—

FeMn HC-FeMn78C8.0 — frequently asked

What is FeMn HC-FeMn78C8.0 used for?

FeMn HC-FeMn78C8.0 is typically used for steelmaking deoxidizer/desulfurizer, alloy steel manganese addition, cast iron alloying and welding flux component. In short: primary manganese melt addition; carbon-graded master alloy; not a machinable product.

What is the tensile strength of FeMn HC-FeMn78C8.0?

FeMn HC-FeMn78C8.0 has a typical tensile strength of 120 MPa (17.4 ksi) — weaker than 100% of steel grades. Strength varies by condition: see the 11 listed tempers.

Is FeMn HC-FeMn78C8.0 easy to machine?

Not especially — machinability is rated not recommended (5/100, worse than 100% of steel grades). Not machined — hard and brittle; supplied crushed and screened (typically 10–50 mm lump, or 1–3 mm granules/powder for cored wire and briquettes).

Can FeMn HC-FeMn78C8.0 be welded?

Not readily — weldability is rated not recommended (5/100). Not weldable; it is a melt addition, charged to the EAF/converter or added to the ladle stream, with Mn recovery typically 85–95 %.

What surface finishes work on FeMn HC-FeMn78C8.0?

No surface finishing; keep dry and sealed to prevent oxidation and moisture-driven hydrogen/phosphine release from fines, and screen out dust before charging.

Can FeMn HC-FeMn78C8.0 be formed, bent or molded?

No cold or hot forming; product forms are cast/crushed lump, granules, briquettes and cored wire fill.

What is the maximum service temperature of FeMn HC-FeMn78C8.0?

FeMn HC-FeMn78C8.0 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.

Sources

  1. GB/T 3795 (Ferromanganese) — SAC / (2014)
  2. ASTM A99 Standard Specification for Ferromanganese — ASTM International (2018)
  3. ISO 5446 Ferromanganese — Specification and conditions of delivery — ISO (2017)
  4. ASM Handbook Vol. 1 — Steelmaking additions and ferroalloys — ASM International (1990)
  5. Manganese ferroalloy LCA data — International Manganese Institute (IMnI) (2022)

Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.