Steel FeMn HC-FeMn74C7.5
Grade
ASTM A99 · GB FeMn78
Slightly lower Mn/C high-carbon grade, common where feedstock ore grade or price favours it.
Values for the HC-FeMn74C7.5 condition
Other FeMn tempers and conditions
FeMn is listed in 11 conditions; see the grade overview at FeMn.
- N-FeMn
- HC-FeMn78C8.0
- HC-FeMn74C7.5
- HC-FeMn68C7.0
- HC-FeMn64C7.0
- LC-FeMn82C0.7
- MC-FeMn78C2.0
- MC-FeMn82C1.5
- ULC-FeMn88C0.1
- LC-FeMn84C0.4
- LC-FeMn88C0.2
Compare all 11 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Nitrided ferromanganese | Use when nitrogen and manganese must be added together, e.g. N-alloyed stainless, duplex and high-strength steels. | — | 80 | 0 | 49 HRC | 0.9 % IACS |
HC-FeMn78C8.0Default FeMn78C8.0 | Bulk workhorse for deoxidation/Mn alloying of carbon and low-alloy steels and cast iron where carbon pickup is acceptable. | — | 120 | 0 | 58 HRC | 1.4 % IACS |
HC-FeMn74C7.5This page FeMn74C7.5 | Slightly lower Mn/C high-carbon grade, common where feedstock ore grade or price favours it. | — | 125 | 0 | 57 HRC | 1.5 % IACS |
FeMn68C7.0 | The most traded Chinese HC grade (Mn 65 %) for ordinary carbon steel and foundry use. | — | 130 | 0 | 56 HRC | 1.6 % IACS |
FeMn64C7.0 | Lowest-Mn standard HC grade; cheapest Mn units for low-spec steel and grey iron. | — | 135 | 0 | 55 HRC | 1.6 % IACS |
FeMn82C0.7 | Intermediate grade bridging medium- and low-carbon ferromanganese. | — | 150 | 0 | 41 HRC | 1.3 % IACS |
FeMn78C2.0 | Economical medium-carbon grade for general alloy steel ladle additions. | — | 160 | 0.5 | 51 HRC | 1.4 % IACS |
FeMn82C1.5 | Choose when Mn must be added late with limited carbon pickup, e.g. medium-carbon and alloy structural steels. | — | 170 | 0.5 | 49 HRC | 1.3 % IACS |
FeMn88C0.1 | Premium grade for ultra-low-carbon, stainless and high-purity steels; highest price per Mn unit. | — | 180 | 0.5 | 30 HRC | 1.2 % IACS |
FeMn84C0.4 | Slightly cheaper low-carbon grade for low-C steels with a small carbon allowance. | — | 240 | 0.8 | 39 HRC | 1.3 % IACS |
FeMn88C0.2 | For low-carbon, IF, stainless and electrical steels where carbon pickup must be minimal. | — | 260 | 1 | 36 HRC | 1.2 % IACS |
What is FeMn HC-FeMn74C7.5?
FeMn HC-FeMn74C7.5 is FeMn in the HC-FeMn74C7.5 grade — slightly lower Mn/C high-carbon grade, common where feedstock ore grade or price favours it. FeMn HC-FeMn74C7.5 has a tensile strength of 125 MPa (18.1 ksi), weaker than 100% of steel grades. Elongation at break is 0% and the elastic modulus is 180 GPa (26.1 Msi). FeMn HC-FeMn74C7.5 has a density of 7.15 g/cm³ (0.258 lb/in³), lighter than 99% of steel grades. It melts at 1,240°C (2,264 °F). HC-FeMn78C8.0 is the default condition FabDigit quotes; HC-FeMn74C7.5 is available on request or by drawing note.
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 — 9.5 W/m·K (5.49 BTU/hr·ft·°F), worse than 100% of steel grades
- Low electrical conductivity — 1.5 % IACS, worse than 100% of steel grades
- Difficult to machine — 5/100, worse than 100% of steel grades
FeMn HC-FeMn74C7.5 properties
Typical room-temperature values for FeMn HC-FeMn74C7.5; 21 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-FeMn74C7.5 has a density of 7.15 g/cm³ (0.258 lb/in³), lighter than 99% of steel grades. It melts at 1,240°C (2,264 °F).
Mechanical10
FeMn HC-FeMn74C7.5 has a tensile strength of 125 MPa (18.1 ksi), weaker than 100% of steel grades. Elongation at break is 0% and the elastic modulus is 180 GPa (26.1 Msi).
Thermal4
FeMn HC-FeMn74C7.5 is rated for continuous service to 400°C (752 °F). It conducts heat at 9.5 W/m·K (5.49 BTU/hr·ft·°F), worse than 100% of steel grades. Thermal expansion is 17 µm/m·K (9.44 µin/in·°F).
Electrical3
FeMn HC-FeMn74C7.5 conducts electricity at 1.5 % IACS, worse than 100% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (6/100), worse than 100% of steel grades.
Sustainability4
Producing a kilogram of FeMn HC-FeMn74C7.5 takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 5%.
Manufacturability4
FeMn HC-FeMn74C7.5's machinability is not recommended (5/100, worse than 100% of steel grades); weldability not recommended (5/100); formability not recommended (2/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with FeMn HC-FeMn74C7.5
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.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| MnFeMn78C8.0 per GB/T 3795 / ASTM A99 high-carbon class | 75 – 82 | 78 |
| Chigh-carbon class | ≤ 8 | 7 |
| Sisub-grades at ≤1.0 / ≤1.5 / ≤2.0 | ≤ 2 | 1 |
| PP classes typically ≤0.20 / ≤0.25 / ≤0.33 / ≤0.38 | ≤ 0.33 | 0.2 |
| S | ≤ 0.03 | 0.02 |
| Fe | balance | — |
FeMn HC-FeMn74C7.5 — frequently asked
What is FeMn HC-FeMn74C7.5 used for?
FeMn HC-FeMn74C7.5 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-FeMn74C7.5?
FeMn HC-FeMn74C7.5 has a typical tensile strength of 125 MPa (18.1 ksi) — weaker than 100% of steel grades. Strength varies by condition: see the 11 listed tempers.
Is FeMn HC-FeMn74C7.5 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-FeMn74C7.5 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-FeMn74C7.5?
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-FeMn74C7.5 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-FeMn74C7.5?
FeMn HC-FeMn74C7.5 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
- GB/T 3795 (Ferromanganese) — SAC / (2014)
- ASTM A99 Standard Specification for Ferromanganese — ASTM International (2018)
- ISO 5446 Ferromanganese — Specification and conditions of delivery — ISO (2017)
- ASM Handbook Vol. 1 — Steelmaking additions and ferroalloys — ASM International (1990)
- 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.