Steel B50A470 Skin Passed
Supply condition
JIS 50A470
Occasionally supplied for improved flatness and punch burr control on high-speed presses; slightly higher strength and marginally higher core loss than the plain annealed coil.
Values for the Skin Passed condition
Other B50A470 tempers and conditions
B50A470 is listed in 3 conditions; see the grade overview at B50A470.
- SRA
- Final Annealed
- Skin Passed
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Stress-relief annealed after blanking | Pick when punching/edge stresses must be recovered: core loss drops and permeability rises by roughly 5–15 %, at the cost of softer, more distortion-prone laminations. | 255 | 400 | 34 | 138 HB | 4.3 % IACS |
Final AnnealedDefault fully processed, insulation coated (as supplied) | Standard as-shipped fully-processed condition: stamp laminations and stack directly, guaranteed P1.5/50 ≤ 4.70 W/kg at 0.50 mm. | 305 | 450 | 30 | 157 HB | 4.3 % IACS |
Skin PassedThis page lightly cold-worked flatness pass | Occasionally supplied for improved flatness and punch burr control on high-speed presses; slightly higher strength and marginally higher core loss than the plain annealed coil. | 350 | 480 | 24 | 171 HB | 4.3 % IACS |
What is B50A470 Skin Passed?
B50A470 Skin Passed is B50A470 supplied in the Skin Passed condition — occasionally supplied for improved flatness and punch burr control on high-speed presses; slightly higher strength and marginally higher core loss than the plain annealed coil. B50A470 Skin Passed has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 74% of steel grades. Elongation at break is 24% and the elastic modulus is 200 GPa (29 Msi). B50A470 Skin Passed has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 95% of steel grades. It melts at 1,500°C (2,732 °F). Final Annealed is the default condition FabDigit quotes; Skin Passed is available on request or by drawing note.
Advantages
- Forms and bends easily — 65/100, better than 81% of steel grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Poor heat conductor — 28 W/m·K (16.2 BTU/hr·ft·°F), worse than 85% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
- Low electrical conductivity — 4.3 % IACS, worse than 82% of steel grades
B50A470 Skin Passed properties
Typical room-temperature values for B50A470 Skin Passed; 20 are specific to this condition. Other listed values are B50A470 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
B50A470 Skin Passed has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 95% of steel grades. It melts at 1,500°C (2,732 °F).
Mechanical14
B50A470 Skin Passed has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 74% of steel grades. Elongation at break is 24% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
B50A470 Skin Passed is rated for continuous service to 200°C (392 °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
B50A470 Skin Passed conducts electricity at 4.3 % IACS, worse than 82% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of B50A470 Skin Passed 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
B50A470 Skin Passed's machinability is good (58/100, better than 75% of steel grades); weldability fair (48/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with B50A470 Skin Passed
Is B50A470 easy to machine?
Primarily progressive-die punched or laser/wire cut; keep punch clearance ~5–8 % of thickness and tools sharp, since burrs and cut-edge damage directly raise core loss.
Can B50A470 be welded?
Laser or micro-TIG tack welding of stacks is feasible but each weld bridges laminations and increases eddy-current loss — prefer interlocking, bonding or cleats.
Can B50A470 be formed, bent or molded?
Excellent blanking and light bending at 0.50 mm; avoid heavy cold work near tooth roots, and stress-relief anneal at 750–800 °C in a neutral, decarburising-free atmosphere if magnetics are critical.
What surface finishes work on B50A470?
Supplied with a thin semi-organic/inorganic insulating coating (C5/C6 type) that also acts as a punching lubricant; do not shot blast or pickle, and mask coating loss areas from corrosion in humid storage.
B50A470 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 |
|---|---|---|
| Cultra-low to avoid magnetic ageing | ≤ 0.01 | 0 |
| Siraises resistivity, lowers eddy-current loss | 1.4 – 2.3 | 1.9 |
| Al | 0.2 – 0.6 | 0.4 |
| Mn | 0.15 – 0.5 | 0.3 |
| P | ≤ 0.06 | 0.02 |
| S | ≤ 0.01 | 0 |
| N | ≤ 0 | 0 |
| Fe | balance | — |
B50A470 Skin Passed — frequently asked
What is B50A470 Skin Passed used for?
B50A470 Skin Passed is typically used for motor stator and rotor laminations, distribution transformer cores, generator and alternator laminations, pump and fan motor cores, reactor and choke cores and solenoid and relay cores. In short: workhorse electrical coil.
What is the yield strength of B50A470 Skin Passed?
B50A470 Skin Passed has a typical yield strength of 350 MPa (50.8 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 74% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is B50A470 Skin Passed easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Primarily progressive-die punched or laser/wire cut; keep punch clearance ~5–8 % of thickness and tools sharp, since burrs and cut-edge damage directly raise core loss.
Can B50A470 Skin Passed be welded?
With care — weldability is rated fair (48/100). Laser or micro-TIG tack welding of stacks is feasible but each weld bridges laminations and increases eddy-current loss — prefer interlocking, bonding or cleats.
What surface finishes work on B50A470 Skin Passed?
Supplied with a thin semi-organic/inorganic insulating coating (C5/C6 type) that also acts as a punching lubricant; do not shot blast or pickle, and mask coating loss areas from corrosion in humid storage.
Can B50A470 Skin Passed be formed, bent or molded?
Excellent blanking and light bending at 0.50 mm; avoid heavy cold work near tooth roots, and stress-relief anneal at 750–800 °C in a neutral, decarburising-free atmosphere if magnetics are critical.
What is the maximum service temperature of B50A470 Skin Passed?
B50A470 Skin Passed 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.
What is the difference between B50A470 Final Annealed and B50A470-SRA?
Final Annealed is the default condition — standard as-shipped fully-processed condition: stamp laminations and stack directly, guaranteed P1.5/50 ≤ 4.70 W/kg at 0.50 mm. SRA: pick when punching/edge stresses must be recovered: core loss drops and permeability rises by roughly 5–15 %, at the cost of softer, more distortion-prone laminations. Yield strength is 305 MPa in Final Annealed versus 255 MPa in SRA.
Can FabDigit make parts in B50A470 Skin Passed?
Yes — B50A470 Skin Passed 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
- JIS C 2552 — Non-oriented electrical steel strip — JSA (2019)
- EN 10106 — Cold rolled non-oriented electrical steel strip and sheet delivered in the fully processed state — CEN (2015)
- Baosteel Electrical Steel Product Catalogue (B50A series) — Baoshan Iron & Steel (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.