Steel FeSi75-CW (Cold worked)
Supply condition
ASTM A100
Wire-injected form for precise late silicon trimming and inoculation in continuous casting.
Values for the CW 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 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 |
CWThis page 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-CW?
FeSi75-CW is FeSi75 supplied in the CW condition — wire-injected form for precise late silicon trimming and inoculation in continuous casting. FeSi75-CW has a tensile strength of 310 MPa (45 ksi), weaker than 98% of steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi). FeSi75-CW 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; CW is available on request or by drawing note.
Advantages
- Lightweight — 3 g/cm³ (0.108 lb/in³), better than 100% of steel grades
- Ductile — tolerates forming and impact — 25%, better than 77% of steel grades
Limitations
- Low fracture toughness — 2 MPa·√m (1.82 ksi·√in), worse than 100% of steel grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 97% of steel grades
- Difficult to machine — 30/100, worse than 89% of steel grades
- Limited service temperature — 300°C (572 °F), worse than 78% of steel grades
- Difficult to weld — 25/100, worse than 77% of steel grades
FeSi75-CW properties
Typical room-temperature values for FeSi75-CW; 16 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-CW 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-CW has a tensile strength of 310 MPa (45 ksi), weaker than 98% of steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi).
Thermal5
FeSi75-CW is rated for continuous service to 300°C (572 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 64% of steel grades. Thermal expansion is 11 µm/m·K (6.11 µin/in·°F).
Electrical3
FeSi75-CW conducts electricity at 9 % IACS, better than 71% of steel grades.
Chemical & Environmental2
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability3
Producing a kilogram of FeSi75-CW 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-CW's machinability is poor (30/100, worse than 89% of steel grades); weldability poor (25/100); formability good (60/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with FeSi75-CW
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-CW — frequently asked
What is FeSi75-CW used for?
FeSi75-CW 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-CW?
FeSi75-CW has a typical tensile strength of 310 MPa (45 ksi) — weaker than 98% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is FeSi75-CW easy to machine?
Not especially — machinability is rated poor (30/100, worse than 89% of steel grades). Not machinable — hard, brittle intermetallic; sized only by crushing, jaw/roll milling and screening.
Can FeSi75-CW be welded?
Not readily — weldability is rated poor (25/100). Not weldable as a product; consumed as a silicon source in steel deoxidation, welding-flux and electrode coatings.
What surface finishes work on FeSi75-CW?
No surface finishing — supplied crushed and screened, kept dry and in ventilated packaging to avoid gas evolution.
Can FeSi75-CW 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-CW?
FeSi75-CW is rated for continuous use to about 300°C (572 °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.