Steel 35W300
EN 35W300
35W300 is a 0.35 mm thin-gauge non-oriented electrical steel, silicon-alloyed for high resistivity and supplied fully processed with a C-5 or inorganic insulating coating, as bare stock, or stress-relief annealed; it is broadly equivalent to M19.
Reference datasheet — 35W300 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.
35W300 tempers and conditions
35W300 is supplied in one standard condition, SRA.
Supply forms, finishes and certifications
Ways 35W300 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
BARE | BARE | Surface finish |
FP-INORG | FP-INORG | Surface finish |
FP-C5Default | FP-C5 | Coating |
What is 35W300?
35W300 is a 0.35 mm thin-gauge non-oriented electrical steel, silicon-alloyed for high resistivity and supplied fully processed with a C-5 or inorganic insulating coating, as bare stock, or stress-relief annealed; it is broadly equivalent to M19. The thin gauge cuts eddy-current loss, which makes it a common choice for medium industrial motor and generator lamination stacks. Mechanically it is a 320 MPa yield, 470 MPa tensile sheet with 24 % elongation, limited to about 200 °C in service, and the thin gauge means more punching strokes and higher stack cost than 0.50 mm grades. 35W300 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). 35W300 has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 81% of steel grades. Elongation at break is 24% and the elastic modulus is 200 GPa (29 Msi).
What is 35W300 used for?
- industrial motor laminations
- generators
- medium transformers
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Poor heat conductor — 25 W/m·K (14.4 BTU/hr·ft·°F), worse than 88% of steel grades
- Low electrical conductivity — 3.6 % IACS, worse than 85% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
- High embodied carbon — 2.5 kg CO₂/kg, worse than 82% of steel grades
35W300 properties
Typical room-temperature values; bars are the position among steel grades.
Physical3
35W300 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
35W300 has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 81% of steel grades. Elongation at break is 24% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
35W300 is rated for continuous service to 200°C (392 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), worse than 88% of steel grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).
Electrical3
35W300 conducts electricity at 3.6 % IACS, worse than 85% of steel grades.
Chemical & Environmental2
Corrosion resistance is poor (18/100), better than 83% of steel grades.
Sustainability4
Producing a kilogram of 35W300 takes about 32 MJ of energy and emits 2.5 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability6
35W300's machinability is fair (42/100, worse than 73% of steel grades); weldability fair (45/100); formability good (55/100).
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. 35W300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 35W300
Is 35W300 easy to machine?
Process mainly by precision blanking or laser cutting. The silicon content wears dies quickly, so use carbide or coated punches and hold burr height to 20 µm or less to prevent interlaminar shorting.
Can 35W300 be welded?
TIG or laser welding around the stack outside diameter is possible, but grain growth and residual stress in the heat-affected zone clearly raise local core loss; prefer interlock tabs, bonding or shrink rings instead.
Can 35W300 be formed, bent or molded?
Blanking behaviour is good; keep bend radii at 1.5t or greater. Not suitable for deep drawing. A 750–800 °C stress-relief anneal in a protective atmosphere can be applied after stamping, provided the coating is a heat-resistant type.
35W300 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 |
|---|---|---|
| SiSi+Al total approx. 3.2-3.6%; sets resistivity and core loss | 2.4 – 3.2 | 2.9 |
| Al | 0.2 – 0.8 | 0.5 |
| Mn | 0.1 – 0.5 | 0.3 |
| Clow C in finished product prevents magnetic aging | ≤ 0.01 | 0 |
| S | ≤ 0.01 | 0 |
| P | ≤ 0.05 | 0.02 |
| N | ≤ 0 | 0 |
| Fe | balance |
What surface finishes work on 35W300?
Coated material is used as supplied and needs no further treatment. Bare stock must be painted or oxide-treated against rust, and coating must be removed locally before welding or brazing.
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
Equivalent designations
Standards and trade names that resolve to Steel 35W300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Similar grades
- M19
How much does 35W300 cost?
35W300 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
35W300 — frequently asked
What is 35W300 used for?
35W300 is typically used for industrial motor laminations, generators and medium transformers. In short: thin-gauge non-oriented steel; M19-class core loss; good punchability.
What is the yield strength of 35W300?
35W300 has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 81% of steel grades.
Is 35W300 easy to machine?
Not especially — machinability is rated fair (42/100, worse than 73% of steel grades). Process mainly by precision blanking or laser cutting. The silicon content wears dies quickly, so use carbide or coated punches and hold burr height to 20 µm or less to prevent interlaminar shorting.
Can 35W300 be welded?
With care — weldability is rated fair (45/100). TIG or laser welding around the stack outside diameter is possible, but grain growth and residual stress in the heat-affected zone clearly raise local core loss; prefer interlock tabs, bonding or shrink rings instead.
What surface finishes work on 35W300?
Coated material is used as supplied and needs no further treatment. Bare stock must be painted or oxide-treated against rust, and coating must be removed locally before welding or brazing.
Can 35W300 be formed, bent or molded?
Blanking behaviour is good; keep bend radii at 1.5t or greater. Not suitable for deep drawing. A 750–800 °C stress-relief anneal in a protective atmosphere can be applied after stamping, provided the coating is a heat-resistant type.
What is the maximum service temperature of 35W300?
35W300 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 35W300 cost?
35W300 is a budget-cost steel ($), cheaper than about 90% 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
- ASTM A677 Nonoriented Electrical Steel Fully Processed Types — ASTM (2020)
- ASM Handbook Vol.1 — Properties of 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.