Steel M103-27N
M103-27N is a high-permeability (Hi-B) grain-oriented electrical steel to EN 10107, 0.27 mm gauge, with a sharply aligned Goss texture and an inorganic phosphate (C-5) coating; double-coated and uncoated conditions are also available.
Reference datasheet — M103-27N is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
M103-27N tempers and conditions
M103-27N is supplied in one standard condition, SRA.
Supply forms, finishes and certifications
Ways M103-27N is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
DBL-COAT | Extra-thick / double insulating coating for high interlaminar resistance | Surface finish |
FP-C5Default | Fully processed, phosphate/inorganic insulating coating | Coating |
Uncoated | Mill-annealed strip without insulating coating | Coating |
What is M103-27N?
M103-27N is a high-permeability (Hi-B) grain-oriented electrical steel to EN 10107, 0.27 mm gauge, with a sharply aligned Goss texture and an inorganic phosphate (C-5) coating; double-coated and uncoated conditions are also available. It is selected where transformer core loss and exciting power must be minimised, and is supplied as fully processed slit strip for stacked or wound cores. Yield strength is 320 MPa, tensile 360 MPa and elongation about 10 %, so formability is limited and directional, with service capped near 200 °C. Cost per tonne is well above conventional grades such as M140-30P. M103-27N has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 97% of steel grades. It melts at 1,490°C (2,714 °F). M103-27N has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 81% of steel grades. Elongation at break is 10% and the elastic modulus is 120 GPa (17.4 Msi).
What is M103-27N used for?
- EHV power transformer cores
- High-efficiency distribution transformer cores
- Wound and toroidal transformer cores
- Shunt reactor cores
- Low-noise transformer cores
- Instrument transformer cores
- Magnetic shielding laminations
Limitations
- Low stiffness — 120 GPa (17.4 Msi), worse than 99% of steel grades
- Hard to polish — 40/100, worse than 96% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Poor heat conductor — 22 W/m·K (12.7 BTU/hr·ft·°F), worse than 93% of steel grades
- Limited ductility — 10%, worse than 91% of steel grades
M103-27N properties
Typical room-temperature values; bars are the position among steel grades.
Physical3
M103-27N has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 97% of steel grades. It melts at 1,490°C (2,714 °F).
Mechanical11
M103-27N has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 81% of steel grades. Elongation at break is 10% and the elastic modulus is 120 GPa (17.4 Msi).
Thermal6
M103-27N is rated for continuous service to 200°C (392 °F). It conducts heat at 22 W/m·K (12.7 BTU/hr·ft·°F), worse than 93% of steel grades. Thermal expansion is 11.6 µm/m·K (6.44 µin/in·°F).
Electrical3
M103-27N conducts electricity at 3.6 % IACS, worse than 85% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (20/100), better than 87% of steel grades.
Sustainability4
Producing a kilogram of M103-27N takes about 33 MJ of energy and emits 2.6 kg of CO₂ — more than 76% of steel grades. Typical recycled content is 15%.
Manufacturability7
M103-27N's machinability is fair (35/100, worse than 84% of steel grades); weldability poor (30/100); formability poor (30/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. M103-27N is highlighted; hover a dot for its name, or open the interactive family chart.
Working with M103-27N
Is M103-27N easy to machine?
Do not machine conventionally — slit, shear, punch or laser/EDM cut with sharp, carbide or coated tooling; keep burr <10 µm and expect abrasive wear from the ceramic/phosphate coating.
Can M103-27N be welded?
Resistance or laser welding of coil joints only; any weld or heat-affected zone locally destroys the Goss texture and raises core loss, so avoid welds in the flux path.
Can M103-27N be formed, bent or molded?
Formability is limited and highly directional — use for flat stacked or wound cores with generous bend radii; all cutting introduces stress that should be removed by an 800 °C stress-relief anneal.
M103-27N 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 |
|---|---|---|
| Siraises resistivity, lowers eddy-current loss | 2.9 – 3.3 | 3.1 |
| Cafter decarburisation annealing | ≤ 0.01 | 0 |
| Mn | 0.03 – 0.15 | 0.08 |
| Alacid-soluble Al; AlN inhibitor typical of Hi-B route | 0.02 – 0.04 | 0.03 |
| Ninhibitor former, removed in final anneal | ≤ 0.01 | 0.01 |
| S | ≤ 0.01 | 0 |
| P | ≤ 0.02 | 0.01 |
| Cuprocess-dependent inhibitor addition | ≤ 0.6 | 0.2 |
| Fe | balance |
What surface finishes work on M103-27N?
Supplied ready-coated with an inorganic phosphate (C-5 type) film; do not paint, plate or anodise — protect from moisture and handle by edges to avoid coating damage.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
How much does M103-27N cost?
M103-27N is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
M103-27N — frequently asked
What is M103-27N used for?
M103-27N is typically used for EHV power transformer cores, high-efficiency distribution transformer cores, wound and toroidal transformer cores, shunt reactor cores, low-noise transformer cores and instrument transformer cores. In short: highest-permeability Hi-B grade; lowest core loss available; higher cost per tonne.
What is the yield strength of M103-27N?
M103-27N has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 81% of steel grades.
Is M103-27N easy to machine?
Not especially — machinability is rated fair (35/100, worse than 84% of steel grades). Do not machine conventionally — slit, shear, punch or laser/EDM cut with sharp, carbide or coated tooling; keep burr <10 µm and expect abrasive wear from the ceramic/phosphate coating.
Can M103-27N be welded?
Not readily — weldability is rated poor (30/100). Resistance or laser welding of coil joints only; any weld or heat-affected zone locally destroys the Goss texture and raises core loss, so avoid welds in the flux path.
What surface finishes work on M103-27N?
Supplied ready-coated with an inorganic phosphate (C-5 type) film; do not paint, plate or anodise — protect from moisture and handle by edges to avoid coating damage.
Can M103-27N be formed, bent or molded?
Formability is limited and highly directional — use for flat stacked or wound cores with generous bend radii; all cutting introduces stress that should be removed by an 800 °C stress-relief anneal.
What is the maximum service temperature of M103-27N?
M103-27N is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does M103-27N cost?
M103-27N is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 10107 — Grain-oriented electrical steel strip and sheet delivered in the fully processed state — CEN (2014)
- ASTM A876 / A976 — Grain-oriented electrical steel and insulating coatings — ASTM International (2019)
- High-permeability grain-oriented electrical steel product data (0.23–0.30 mm grades) — European/Asian GO steel producers (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (magnetically soft materials) — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.