Steel 50W470 · heat-treated state · default condition
Steel 50W470 Final Annealed
Properties of the Final Annealed condition, compared with the other 50W470 tempers.
Standard fully-processed coil/sheet as shipped: magnetic properties guaranteed, ready to punch and stack without further annealing.
What is 50W470 Final Annealed?
50W470 Final Annealed is 50W470 heat treated to Final Annealed — standard fully-processed coil/sheet as shipped: magnetic properties guaranteed, ready to punch and stack without further annealing. 50W470 Final Annealed has a yield strength of 310 MPa (45 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 83% of steel grades. Elongation at break is 30% and the elastic modulus is 190 GPa (27.6 Msi). 50W470 Final Annealed has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 95% of steel grades. It melts at 1,480°C (2,696 °F).
Advantages
- Ductile — tolerates forming and impact — 30%, better than 92% of steel grades
- Forms and bends easily — 70/100, better than 85% of steel grades
Limitations
- Limited service temperature — 180°C (356 °F), worse than 98% of steel grades
- Poor heat conductor — 28 W/m·K (16.2 BTU/hr·ft·°F), worse than 85% of steel grades
- Low strength — 310 MPa (45 ksi), worse than 83% of steel grades
50W470 Final Annealed properties
Typical room-temperature values for 50W470 Final Annealed — 8 properties are specific to this condition; the rest are grade-level values shared by every 50W470 temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
50W470 Final Annealed has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 95% of steel grades. It melts at 1,480°C (2,696 °F).
Mechanical10
50W470 Final Annealed has a yield strength of 310 MPa (45 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 83% of steel grades. Elongation at break is 30% and the elastic modulus is 190 GPa (27.6 Msi).
Thermal5
50W470 Final Annealed is rated for continuous service to 180°C (356 °F). It conducts heat at 28 W/m·K (16.2 BTU/hr·ft·°F), worse than 85% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical2
50W470 Final Annealed has an electrical resistivity of 4.2×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of 50W470 Final Annealed takes about 32 MJ of energy and emits 2.3 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability6
50W470 Final Annealed's machinability is fair (45/100, worse than 65% of steel grades); weldability good (55/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other 50W470 tempers and conditions
50W470 is also supplied in 2 other conditions. The full side-by-side table is on the 50W470 overview.
- Final AnnealedDefaultStandard fully-processed coil/sheet as shipped: magnetic properties guaranteed, ready to punch and stack without further annealing.310 MPa yield · 160 HV
Working with 50W470 Final Annealed
Is 50W470 easy to machine?
Primarily blanked/punched or laser cut; the ~2 % Si makes it abrasive, so use carbide dies with tight clearance (≈5 % of thickness) and re-grind often to limit burr and edge stress.
Can 50W470 be welded?
Only tack/laser stitch welding of stacks is advisable — HAZ recrystallisation and burr shorting between laminations raise eddy-current loss.
Can 50W470 be formed, bent or molded?
Good flat-blanking and mild bending formability; avoid heavy drawing or cold work, and interleave die maintenance to keep burr height below ~20 µm.
What surface finishes work on 50W470?
Delivered with a thin inorganic/semi-organic insulating varnish (C-3/C-5 class); do not degrease aggressively, and if stress-relief annealing choose a coating rated for 750–800 °C.
50W470 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 specifies magnetic properties, not chemistry; values are typical mill analysis | ≤ 0.01 | 0 |
| Si | 1.8 – 2.5 | 2.2 |
| Al | 0.2 – 0.6 | 0.35 |
| Mn | 0.15 – 0.6 | 0.3 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.01 | 0 |
| N | ≤ 0.01 | 0 |
| Fe | balance | — |
50W470 Final Annealed — frequently asked
What is 50W470 Final Annealed used for?
50W470 Final Annealed is typically used for motor stator and rotor laminations, traction and EV drive motor cores, generator and alternator stacks, distribution transformer cores, servo and stepper motor laminations and reactor and choke cores. In short: standard electrical-steel coil.
What is the yield strength of 50W470 Final Annealed?
50W470 Final Annealed has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 83% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is 50W470 Final Annealed easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Primarily blanked/punched or laser cut; the ~2 % Si makes it abrasive, so use carbide dies with tight clearance (≈5 % of thickness) and re-grind often to limit burr and edge stress.
Can 50W470 Final Annealed be welded?
Yes — weldability is rated good (55/100). Only tack/laser stitch welding of stacks is advisable — HAZ recrystallisation and burr shorting between laminations raise eddy-current loss.
What surface finishes work on 50W470 Final Annealed?
Delivered with a thin inorganic/semi-organic insulating varnish (C-3/C-5 class); do not degrease aggressively, and if stress-relief annealing choose a coating rated for 750–800 °C.
Can 50W470 Final Annealed be formed, bent or molded?
Good flat-blanking and mild bending formability; avoid heavy drawing or cold work, and interleave die maintenance to keep burr height below ~20 µm.
What is the maximum service temperature of 50W470 Final Annealed?
50W470 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 50W470 Final Annealed and 50W470-SRA?
Final Annealed is the default condition — standard fully-processed coil/sheet as shipped: magnetic properties guaranteed, ready to punch and stack without further annealing. SRA: choose when punching/laser-cutting residual stress must be removed to recover core loss (typically 5–15 % lower loss) in high-efficiency motor cores. Yield strength is 310 MPa in Final Annealed versus 280 MPa in SRA.
Can FabDigit make parts in 50W470 Final Annealed?
Yes — 50W470 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 non-oriented electrical steel strip and sheet — SAC (China) (2016)
- JIS C 2552 Non-oriented electrical steel strip (50A470 equivalent) — JISC (2014)
- Baosteel non-oriented electrical steel B50A470 product data — Baoshan Iron & Steel (2022)
- ASM Handbook Vol.1 — Properties of Soft Magnetic Fe-Si Alloys — ASM International (1990)
- Mysteel / SMM 50W470 — Mysteel (2026)
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.