Steel 50W470
EN 50W470 · ASTM A677 · JIS 50A470
50W470 is a non-oriented silicon electrical steel (Fe with roughly 1–3.5 % Si) supplied to the ASTM A677 / M470-50A family as coated coil and sheet with isotropic in-plane magnetic properties.
Values for the Final Annealed condition
50W470 tempers and conditions
50W470 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 | Choose when punching/laser-cutting residual stress must be removed to recover core loss (typically 5–15 % lower loss) in high-efficiency motor cores. | 280 | 410 | 33 | 143 HB | 4.1 % IACS |
Final AnnealedDefault fully processed, insulation coated (as delivered) | Standard fully-processed coil/sheet as shipped: magnetic properties guaranteed, ready to punch and stack without further annealing. | 310 | 440 | 30 | 152 HB | 4.1 % IACS |
Supply forms, finishes and certifications
Ways 50W470 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
As-Punched | As-Punched / as-sheared laminations | Surface finish |
What is 50W470?
50W470 is a non-oriented silicon electrical steel (Fe with roughly 1–3.5 % Si) supplied to the ASTM A677 / M470-50A family as coated coil and sheet with isotropic in-plane magnetic properties. It is the default lamination stock for rotating machines, punched or laser cut and stacked into motor, generator and small transformer cores; typical values are 310 MPa yield, 440 MPa tensile and 30 % elongation, with service to 180 °C set by the insulating coating. The silicon content is abrasive to dies, welding a stack degrades core loss, and grain-oriented steel remains the better choice where flux follows a single direction. 50W470 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). 50W470 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).
What is 50W470 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
- Reactor and choke cores
- Small pump and fan motor stacks
Advantages
- Ductile — tolerates forming and impact — 30%, better than 93% of steel grades
- Forms and bends easily — 70/100, better than 86% 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
- Low electrical conductivity — 4.1 % IACS, worse than 83% of steel grades
50W470 properties
Typical room-temperature values for 50W470-Final Annealed; bars are the position among steel grades.
Physical3
50W470 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).
Mechanical12
50W470 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 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).
Electrical3
50W470 conducts electricity at 4.1 % IACS, worse than 83% of steel grades.
Chemical & Environmental2
Corrosion resistance is poor (20/100), better than 87% of steel grades.
Sustainability4
Producing a kilogram of 50W470 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'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.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. 50W470 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 50W470
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.
Manufacturability
The process limits FabDigit applies to 50W470. Every 50W470 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
Sheet metal
| Formability | Better70 / 100 |
|---|---|
| Weldability | Poor55 / 100 |
| Bendable | Yes |
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 |
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.
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
Equivalent designations
Standards and trade names that resolve to Steel 50W470 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A677
- EN / DIN / Werkstoff-Nr.
- M470-50A
- JIS
- 50A470
How much does 50W470 cost?
50W470 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.
50W470 — frequently asked
What is 50W470 used for?
50W470 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?
50W470 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 2 listed tempers.
Is 50W470 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 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?
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 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?
50W470 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.
How much does 50W470 cost?
50W470 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 50W470?
Yes — 50W470 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 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; 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.