Steel 35W270
EN 35W270
35W270 is a Chinese-standard (GB/T 2521) fully-processed cold-rolled non-oriented electrical steel: 0.35 mm nominal thickness with a guaranteed specific core loss P1.5/50 ≤ 2.70 W/kg and magnetic polarisation J2500 ≥ 1.60 T.
Values for the Final Annealed condition
35W270 tempers and conditions
35W270 is supplied in 2 conditions, soft to hard. Final Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Stress-relief annealed after blanking | Pick when punching/laser-cut edge stress must be removed to recover the lowest core loss in finished laminations. | 300 | 440 | 22 | 152 HB | 3.4 % IACS |
Final AnnealedDefault fully processed, insulation-coated strip as delivered | Standard fully-processed delivery condition: magnetic properties are already guaranteed, punch and stack directly with no further anneal. | 340 | 470 | 17 | 170 HB | 3.4 % IACS |
Supply forms, finishes and certifications
Ways 35W270 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Coated C-5 | Inorganic/semi-organic anneal-resistant insulation coating | Supply form |
What is 35W270?
35W270 is a Chinese-standard (GB/T 2521) fully-processed cold-rolled non-oriented electrical steel: 0.35 mm nominal thickness with a guaranteed specific core loss P1.5/50 ≤ 2.70 W/kg and magnetic polarisation J2500 ≥ 1.60 T. The high silicon + aluminium content raises resistivity to suppress eddy-current loss, so it is chosen for high-efficiency motor and generator stator/rotor laminations, EV traction motors, and high-frequency reactors. Limits are low thermal/electrical conductivity, brittle-hard punching behaviour that wears dies, degraded magnetic performance after welding or mechanical stress unless stress-relief annealed, and essentially no corrosion resistance beyond the thin insulating coating. 35W270 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). 35W270 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 76% of steel grades. Elongation at break is 17% and the elastic modulus is 185 GPa (26.8 Msi).
What is 35W270 used for?
- Motor stator and rotor laminations
- EV traction motor cores
- Generator laminations
- Distribution transformer cores
- High-frequency reactor and inductor cores
- Compressor and pump motor stacks
- Servo motor lamination stacks
Limitations
- Limited service temperature — 180°C (356 °F), worse than 98% 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 — 3.4 % IACS, worse than 86% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
- Difficult to machine — 40/100, worse than 77% of steel grades
35W270 properties
Typical room-temperature values for 35W270-Final Annealed; bars are the position among steel grades.
Physical3
35W270 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).
Mechanical12
35W270 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 76% of steel grades. Elongation at break is 17% and the elastic modulus is 185 GPa (26.8 Msi).
Thermal6
35W270 is rated for continuous service to 180°C (356 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), worse than 88% of steel grades. Thermal expansion is 11.6 µm/m·K (6.44 µin/in·°F).
Electrical3
35W270 conducts electricity at 3.4 % IACS, worse than 86% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (18/100), better than 83% of steel grades.
Sustainability4
Producing a kilogram of 35W270 takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 20%.
Manufacturability6
35W270's machinability is fair (40/100, worse than 77% of steel grades); weldability fair (40/100); 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. 35W270 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 35W270
Is 35W270 easy to machine?
Punch or laser/wire-cut rather than machine; carbide or coated tooling and sharp die clearance (~5 % of thickness) are essential because the Si-Al content is abrasive and burrs raise core loss.
Can 35W270 be welded?
TIG/laser tack or edge welding of stacks is possible but the heat-affected zone loses permeability and shorts laminations locally — prefer interlock, bonding or riveting.
Can 35W270 be formed, bent or molded?
Cold blanking and light bending only; the strip is comparatively hard and low in ductility, so avoid deep drawing and keep bend radii ≥ 2× thickness.
Manufacturability
The process limits FabDigit applies to 35W270. Every 35W270 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
Sheet metal
| Formability | Better55 / 100 |
|---|---|
| Weldability | Poor40 / 100 |
| Bendable | Yes |
35W270 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 |
|---|---|---|
| CGB/T 2521 is property-based; composition is producer-controlled | ≤ 0.01 | 0 |
| Siraises resistivity, lowers eddy-current loss | 2.6 – 3.2 | 2.9 |
| Al | 0.3 – 0.8 | 0.5 |
| Mn | 0.1 – 0.5 | 0.25 |
| P | ≤ 0.03 | 0.02 |
| Skept low to avoid MnS inclusions | ≤ 0.01 | 0 |
| N | ≤ 0 | 0 |
| Fe | balance |
What surface finishes work on 35W270?
Delivered with a thin inorganic/semi-organic insulation coating; do not pickle or anodize — apply varnish impregnation or epoxy encapsulation after stacking for humidity protection.
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).
Plating
Black / Phosphate
Thermal Spray
How much does 35W270 cost?
35W270 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.
35W270 — frequently asked
What is 35W270 used for?
35W270 is typically used for motor stator and rotor laminations, EV traction motor cores, generator laminations, distribution transformer cores, high-frequency reactor and inductor cores and compressor and pump motor stacks. In short: non-oriented electrical coil.
What is the yield strength of 35W270?
35W270 has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 76% of steel grades. Strength varies by condition: see the 2 listed tempers.
Is 35W270 easy to machine?
Not especially — machinability is rated fair (40/100, worse than 77% of steel grades). Punch or laser/wire-cut rather than machine; carbide or coated tooling and sharp die clearance (~5 % of thickness) are essential because the Si-Al content is abrasive and burrs raise core loss.
Can 35W270 be welded?
With care — weldability is rated fair (40/100). TIG/laser tack or edge welding of stacks is possible but the heat-affected zone loses permeability and shorts laminations locally — prefer interlock, bonding or riveting.
What surface finishes work on 35W270?
Delivered with a thin inorganic/semi-organic insulation coating; do not pickle or anodize — apply varnish impregnation or epoxy encapsulation after stacking for humidity protection.
Can 35W270 be formed, bent or molded?
Cold blanking and light bending only; the strip is comparatively hard and low in ductility, so avoid deep drawing and keep bend radii ≥ 2× thickness.
What is the maximum service temperature of 35W270?
35W270 is rated for continuous use to about 180°C (356 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 35W270 Final Annealed and 35W270-SRA?
Final Annealed is the default condition — standard fully-processed delivery condition: magnetic properties are already guaranteed, punch and stack directly with no further anneal. SRA: pick when punching/laser-cut edge stress must be removed to recover the lowest core loss in finished laminations. Yield strength is 340 MPa in Final Annealed versus 300 MPa in SRA.
How much does 35W270 cost?
35W270 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.
Can FabDigit make parts in 35W270?
Yes — 35W270 is available for sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- GB/T 2521.1 Cold-rolled grain-oriented and non-oriented electrical steel strip — Part 1 (2016)
- IEC 60404-8-4 / EN 10106 Cold rolled non-oriented electrical steel sheet and strip (M250-35A class) — IEC / CEN (2013)
- Non-oriented electrical steel product handbook (B35A/35W series) — Baosteel (2022)
- 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.