Steel FeSi75 LUMP-10-100-A
Grade
ASTM A100
LUMP-10-100-A = lump 10–100 mm, A-class
Coarser sizing for large ladles and electric-furnace charging where slower dissolution is acceptable.
Values for the LUMP-10-100-A condition
Other FeSi75 tempers and conditions
FeSi75 is listed in 8 conditions; see the grade overview at FeSi75.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Al ≤2.0 %, B-class | Lowest-cost chemistry for cast iron and non-critical deoxidation where Al and P limits are relaxed. | — | 110 | 0 | 66 HRC | 0.31 % IACS |
Al ≤1.5 %, A-class impurities | Workhorse export/mill grade for carbon and low-alloy steel deoxidation. | — | 115 | 0 | 66 HRC | 0.3 % IACS |
LUMP-10-50-ADefault Lump 10–50 mm, A-class | Standard stocked size and chemistry for ladle deoxidation and silicon alloying in steelmaking. | — | 120 | 0 | 67 HRC | 0.29 % IACS |
LUMP-10-100-AThis page Lump 10–100 mm, A-class | Coarser sizing for large ladles and electric-furnace charging where slower dissolution is acceptable. | — | 120 | 0 | 67 HRC | 0.29 % IACS |
Al ≤1.0 %, A-class impurities | Common intermediate chemistry balancing price against Al limit for general steel deoxidation. | — | 120 | 0 | 67 HRC | 0.29 % IACS |
Low-aluminium, A-class impurities | Choose when aluminium pick-up must be minimised (clean steel, tyre cord, silicon steel). | — | 125 | 0 | 67 HRC | 0.29 % IACS |
Low-Al / low-Ca refining grade (Al ≤0.5 %, Ca ≤0.5 %, C ≤0.10 %) | For stainless, silicon-steel and cored-wire feedstock where Ca and C additions must be tightly controlled. | — | 130 | 0 | 68 HRC | 0.28 % IACS |
Cold worked | Wire-injected form for precise late silicon trimming and inoculation in continuous casting. | 200 | 310 | 25 | 110 HB | 9 % IACS |
What is FeSi75 LUMP-10-100-A?
FeSi75 LUMP-10-100-A is FeSi75 in the LUMP-10-100-A grade — coarser sizing for large ladles and electric-furnace charging where slower dissolution is acceptable. FeSi75 LUMP-10-100-A 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 160 GPa (23.2 Msi). FeSi75 LUMP-10-100-A has a density of 3 g/cm³ (0.108 lb/in³), lighter than 100% of steel grades. It melts at 1,210°C (2,210 °F). LUMP-10-50-A is the default condition FabDigit quotes; LUMP-10-100-A is available on request or by drawing note.
Advantages
- Lightweight — 3 g/cm³ (0.108 lb/in³), better than 100% of steel grades
- High service temperature — 800°C (1,472 °F), better than 100% of steel grades
- Good corrosion resistance — 55/100, better than 99% of steel grades
Limitations
- Limited ductility — 0%, worse than 100% of steel grades
- Low fracture toughness — 2 MPa·√m (1.82 ksi·√in), worse than 100% of steel grades
- Low electrical conductivity — 0.29 % IACS, worse than 100% of steel grades
- Difficult to machine — 3/100, worse than 100% of steel grades
- Difficult to weld — 3/100, worse than 100% of steel grades
FeSi75 LUMP-10-100-A properties
Typical room-temperature values for FeSi75 LUMP-10-100-A; 17 are specific to this condition. Other listed values are FeSi75 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
FeSi75 LUMP-10-100-A has a density of 3 g/cm³ (0.108 lb/in³), lighter than 100% of steel grades. It melts at 1,210°C (2,210 °F).
Mechanical10
FeSi75 LUMP-10-100-A 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 160 GPa (23.2 Msi).
Thermal5
FeSi75 LUMP-10-100-A is rated for continuous service to 800°C (1,472 °F). It conducts heat at 12 W/m·K (6.93 BTU/hr·ft·°F), worse than 99% of steel grades. Thermal expansion is 11 µm/m·K (6.11 µin/in·°F).
Electrical3
FeSi75 LUMP-10-100-A conducts electricity at 0.29 % IACS, worse than 100% of steel grades.
Chemical & Environmental2
Corrosion resistance is good (55/100), better than 99% of steel grades.
Sustainability3
Producing a kilogram of FeSi75 LUMP-10-100-A takes about 65 MJ of energy and emits 5.5 kg of CO₂ — more than 96% of steel grades. Typical recycled content is 2%.
Manufacturability4
FeSi75 LUMP-10-100-A's machinability is not recommended (3/100, worse than 100% of steel grades); weldability not recommended (3/100); formability not recommended (1/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with FeSi75 LUMP-10-100-A
Is FeSi75 easy to machine?
Not machinable — hard, brittle intermetallic; sized only by crushing, jaw/roll milling and screening.
Can FeSi75 be welded?
Not weldable as a product; consumed as a silicon source in steel deoxidation, welding-flux and electrode coatings.
Can FeSi75 be formed, bent or molded?
No plastic forming; fines are agglomerated by briquetting with binder or sheathed into cored wire.
What surface finishes work on FeSi75?
No surface finishing — supplied crushed and screened, kept dry and in ventilated packaging to avoid gas evolution.
FeSi75 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 |
|---|---|---|
| SiGB/T 2272 / ISO 5445 FeSi75 range | 72 – 80 | 75 |
| Al0.5 / 1.0 / 1.5 / 2.0 % sub-grades | ≤ 1.5 | 1 |
| Ca | ≤ 1 | 0.5 |
| C | ≤ 0.2 | 0.1 |
| PA-class | ≤ 0.04 | 0.03 |
| S | ≤ 0.02 | 0.01 |
| Mn | ≤ 0.5 | 0.3 |
| Cr | ≤ 0.5 | 0.2 |
| Ti | ≤ 0.1 | 0.05 |
| Fe | balance | — |
FeSi75 LUMP-10-100-A — frequently asked
What is FeSi75 LUMP-10-100-A used for?
FeSi75 LUMP-10-100-A is typically used for steel deoxidation, ductile/gray iron inoculation, alloy addition in foundries and silicon steel raw material. In short: standard silicon master alloy; melt addition, not stock; sized by crushing and screening.
What is the tensile strength of FeSi75 LUMP-10-100-A?
FeSi75 LUMP-10-100-A has a typical tensile strength of 120 MPa (17.4 ksi) — weaker than 100% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is FeSi75 LUMP-10-100-A easy to machine?
Not especially — machinability is rated not recommended (3/100, worse than 100% of steel grades). Not machinable — hard, brittle intermetallic; sized only by crushing, jaw/roll milling and screening.
Can FeSi75 LUMP-10-100-A be welded?
Not readily — weldability is rated not recommended (3/100). Not weldable as a product; consumed as a silicon source in steel deoxidation, welding-flux and electrode coatings.
What surface finishes work on FeSi75 LUMP-10-100-A?
No surface finishing — supplied crushed and screened, kept dry and in ventilated packaging to avoid gas evolution.
Can FeSi75 LUMP-10-100-A be formed, bent or molded?
No plastic forming; fines are agglomerated by briquetting with binder or sheathed into cored wire.
What is the maximum service temperature of FeSi75 LUMP-10-100-A?
FeSi75 LUMP-10-100-A is rated for continuous use to about 800°C (1,472 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between FeSi75 LUMP-10-50-A and FeSi75-CW?
LUMP-10-50-A is the default condition — standard stocked size and chemistry for ladle deoxidation and silicon alloying in steelmaking. CW: wire-injected form for precise late silicon trimming and inoculation in continuous casting.
Sources
- GB/T 2272 (Ferrosilicon) — SAC (2020)
- ISO 5445 Ferrosilicon — Specification and conditions of delivery — ISO (1980)
- ASTM A100 Standard Specification for Ferrosilicon — ASTM International (2018)
- ASM Handbook Vol.3: Alloy Phase Diagrams (Fe–Si) — ASM International (1992)
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.