Steel 30P105
EN 30P105
30P105 is a grain-oriented Fe-3%Si electrical steel supplied to JIS C2553, with a Goss texture aligned to the rolling direction and a mill-applied C-5 insulating coating.
Reference datasheet — 30P105 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.
30P105 tempers and conditions
30P105 is supplied in one standard condition, SRA.
Supply forms, finishes and certifications
Ways 30P105 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
C5 | C-5 | Surface finish |
FPDefault | Fully processed, final annealed, insulation coated | Surface finish |
SLIT | Slit coil / mitre-cut laminations | Surface finish |
What is 30P105?
30P105 is a grain-oriented Fe-3%Si electrical steel supplied to JIS C2553, with a Goss texture aligned to the rolling direction and a mill-applied C-5 insulating coating. It is specified for transformer and reactor cores where low core loss along the flux path outweighs mechanical properties, and ships as fully processed coil, slit strip and stress-relief-annealed laminations. Properties are strongly directional: tensile strength is 350 MPa, elongation about 8 %, formability low, and service is limited to about 200 °C. EN 10107 grades such as M140-30P are the nearest equivalents. 30P105 has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 97% of steel grades. It melts at 1,480°C (2,696 °F). 30P105 has a yield strength of 315 MPa (45.7 ksi) and a tensile strength of 350 MPa (50.8 ksi) — weaker than 82% of steel grades. Elongation at break is 8% and the elastic modulus is 120 GPa (17.4 Msi).
What is 30P105 used for?
- Distribution transformer cores
- Power transformer cores
- Wound (unicore) transformer cores
- Reactor cores
- Instrument and current transformer cores
- Welding transformer cores
- Magnetic shielding laminations
Limitations
- Low stiffness — 120 GPa (17.4 Msi), worse than 99% of steel grades
- Limited ductility — 8%, worse than 95% of steel grades
- Poor heat conductor — 21 W/m·K (12.1 BTU/hr·ft·°F), worse than 95% of steel grades
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- High embodied carbon — 2.6 kg CO₂/kg, worse than 87% of steel grades
30P105 properties
Typical room-temperature values; bars are the position among steel grades.
Physical3
30P105 has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 97% of steel grades. It melts at 1,480°C (2,696 °F).
Mechanical11
30P105 has a yield strength of 315 MPa (45.7 ksi) and a tensile strength of 350 MPa (50.8 ksi) — weaker than 82% of steel grades. Elongation at break is 8% and the elastic modulus is 120 GPa (17.4 Msi).
Thermal6
30P105 is rated for continuous service to 200°C (392 °F). It conducts heat at 21 W/m·K (12.1 BTU/hr·ft·°F), worse than 95% of steel grades. Thermal expansion is 11.6 µm/m·K (6.44 µin/in·°F).
Electrical3
30P105 conducts electricity at 3.6 % IACS, worse than 85% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (18/100), better than 83% of steel grades.
Sustainability4
Producing a kilogram of 30P105 takes about 34 MJ of energy and emits 2.6 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 20%.
Manufacturability5
30P105's machinability is fair (40/100, worse than 77% of steel grades); weldability fair (40/100); formability fair (35/100).
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. 30P105 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 30P105
Is 30P105 easy to machine?
Normally slit, punched or mitre-sheared rather than machined; use sharp carbide tooling and tight clearance (≈5 % of thickness) to keep burrs under ~20 µm, as burrs short-circuit laminations and raise loss.
Can 30P105 be welded?
Fusion welding (TIG/laser) is possible for core clamping or strip joining but destroys the Goss texture and coating in the heat-affected zone, so keep welds off the flux path.
Can 30P105 be formed, bent or molded?
Cold formability is poor and strongly anisotropic — restrict to gentle bending along the rolling direction and core winding, then stress-relief anneal at ~800 °C in a protective atmosphere.
30P105 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 |
|---|---|---|
| SiGoss-textured 3% silicon iron | 2.9 – 3.4 | 3.15 |
| Cafter decarburization anneal | ≤ 0.01 | 0 |
| Mn | 0.03 – 0.15 | 0.08 |
| SMnS/AlN inhibitors largely removed in purification anneal | ≤ 0.01 | 0 |
| P | ≤ 0.03 | 0.01 |
| Alacid-soluble Al for AlN inhibitor (Hi-B route) | ≤ 0.04 | 0.02 |
| N | ≤ 0.01 | 0 |
| Cuoptional inhibitor addition | ≤ 0.15 | 0.05 |
| Fe | balance |
What surface finishes work on 30P105?
Supplied ready-coated (glass film + phosphate); avoid pickling, abrasive cleaning or heavy handling that damages the insulation, and re-varnish only where coating loss is unavoidable.
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 30P105 cost?
30P105 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.
30P105 — frequently asked
What is 30P105 used for?
30P105 is typically used for distribution transformer cores, power transformer cores, wound (unicore) transformer cores, reactor cores, instrument and current transformer cores and welding transformer cores. In short: low-loss transformer core steel; JIS grain-oriented grade; strongly directional properties.
What is the yield strength of 30P105?
30P105 has a typical yield strength of 315 MPa (45.7 ksi) and a tensile strength of 350 MPa (50.8 ksi) — weaker than 82% of steel grades.
Is 30P105 easy to machine?
Not especially — machinability is rated fair (40/100, worse than 77% of steel grades). Normally slit, punched or mitre-sheared rather than machined; use sharp carbide tooling and tight clearance (≈5 % of thickness) to keep burrs under ~20 µm, as burrs short-circuit laminations and raise loss.
Can 30P105 be welded?
With care — weldability is rated fair (40/100). Fusion welding (TIG/laser) is possible for core clamping or strip joining but destroys the Goss texture and coating in the heat-affected zone, so keep welds off the flux path.
What surface finishes work on 30P105?
Supplied ready-coated (glass film + phosphate); avoid pickling, abrasive cleaning or heavy handling that damages the insulation, and re-varnish only where coating loss is unavoidable.
Can 30P105 be formed, bent or molded?
Cold formability is poor and strongly anisotropic — restrict to gentle bending along the rolling direction and core winding, then stress-relief anneal at ~800 °C in a protective atmosphere.
What is the maximum service temperature of 30P105?
30P105 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 30P105 cost?
30P105 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
- JIS C 2553 Grain-oriented magnetic steel sheet and strip — JSA (2019)
- GB/T 2521.2 Cold-rolled grain-oriented electrical steel strip (30Q105 equivalent) — SAC (2016)
- Grain-oriented electrical steel (Hi-B) product data — Nippon Steel (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (magnetically soft materials) — ASM International (1990)
- ASM Handbook Vol.2 / Metals Handbook — Special-Purpose Materials, Si-Fe alloys — 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.