Steel 35W270 · heat-treated state · default condition
Steel 35W270 Final Annealed
Properties of the Final Annealed condition, compared with the other 35W270 tempers.
Standard fully-processed delivery condition: magnetic properties are already guaranteed, punch and stack directly with no further anneal.
What is 35W270 Final Annealed?
35W270 Final Annealed is 35W270 heat treated to Final Annealed — standard fully-processed delivery condition: magnetic properties are already guaranteed, punch and stack directly with no further anneal. 35W270 Final Annealed 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). 35W270 Final Annealed 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).
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
- Low strength — 340 MPa (49.3 ksi), worse than 76% of steel grades
35W270 Final Annealed properties
Typical room-temperature values for 35W270 Final Annealed — 9 properties are specific to this condition; the rest are grade-level values shared by every 35W270 temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
35W270 Final Annealed 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
35W270 Final Annealed 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 Final Annealed 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 Final Annealed 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 Final Annealed 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 Final Annealed's machinability is fair (40/100, worse than 76% 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.
Other 35W270 tempers and conditions
35W270 is also supplied in 2 other conditions. The full side-by-side table is on the 35W270 overview.
- Final AnnealedDefaultStandard fully-processed delivery condition: magnetic properties are already guaranteed, punch and stack directly with no further anneal.340 MPa yield · 180 HV
Working with 35W270 Final Annealed
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.
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.
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 | — |
35W270 Final Annealed — frequently asked
What is 35W270 Final Annealed used for?
35W270 Final Annealed 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 Final Annealed?
35W270 Final Annealed 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 3 listed tempers.
Is 35W270 Final Annealed easy to machine?
Not especially — machinability is rated fair (40/100, worse than 76% 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 Final Annealed 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 Final Annealed?
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 Final Annealed 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 Final Annealed?
35W270 Final Annealed 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.
Can FabDigit make parts in 35W270 Final Annealed?
Yes — 35W270 Final Annealed is available for sheet metal with instant online pricing. 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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.