Steel 50W800-SRA
Heat-treated state
EN 50W800
SRA = stress-relief annealed after stamping
Anneal stamped laminations at 750–800 °C to restore magnetic properties in work-hardened cut edges and lower core loss; the sheet softens to 280 MPa yield and must be re-insulated afterwards.
Values for the SRA condition
What is 50W800-SRA?
50W800-SRA is 50W800 heat treated to SRA — anneal stamped laminations at 750–800 °C to restore magnetic properties in work-hardened cut edges and lower core loss; the sheet softens to 280 MPa yield and must be re-insulated afterwards. 50W800-SRA has a yield strength of 280 MPa (40.6 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 90% of steel grades. Elongation at break is 32% and the elastic modulus is 205 GPa (29.7 Msi). 50W800-SRA has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,480°C (2,696 °F).
Advantages
- Ductile — tolerates forming and impact — 32%, better than 95% of steel grades
- Forms and bends easily — 78/100, better than 91% of steel grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Low strength — 280 MPa (40.6 ksi), worse than 90% of steel grades
- Poor heat conductor — 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 83% of steel grades
- Low electrical conductivity — 4.3 % IACS, worse than 82% of steel grades
50W800-SRA properties
Typical room-temperature values for 50W800-SRA; 5 are specific to this condition. Other listed values are 50W800 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
50W800-SRA has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,480°C (2,696 °F).
Mechanical12
50W800-SRA has a yield strength of 280 MPa (40.6 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 90% of steel grades. Elongation at break is 32% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
50W800-SRA is rated for continuous service to 200°C (392 °F). It conducts heat at 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 83% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
50W800-SRA conducts electricity at 4.3 % IACS, worse than 82% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (18/100), better than 83% of steel grades.
Sustainability4
Producing a kilogram of 50W800-SRA takes about 32 MJ of energy and emits 2.3 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 20%.
Manufacturability7
50W800-SRA's machinability is fair (45/100, worse than 65% of steel grades); weldability good (55/100); formability very good (78/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 50W800-SRA
Is 50W800 easy to machine?
Fabricated mainly by precision blanking; the material tends to smear on tooling and is burr-sensitive, so use carbide die edges, regrind frequently and hold burr height to 0.02–0.05 mm to prevent interlaminar shorts.
Can 50W800 be welded?
TIG or laser spot tacking can hold a stack together, but the weld bridges laminations and markedly raises local iron loss — use interlock cleats, riveting or a self-bonding coating instead.
Can 50W800 be formed, bent or molded?
Blanking and bending behaviour is good thanks to low Si content and high ductility; work hardening in the 2–5 mm zone along cut edges raises core loss, so stress-relief anneal at 750–800 °C where magnetics matter.
What surface finishes work on 50W800?
Standard delivery carries a C-5 inorganic or C-6 composite insulating coating and needs no further treatment; bare material requires varnish impregnation, phosphating or an oxide treatment for rust protection and interlaminar insulation.
50W800 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 |
|---|---|---|
| Ctypical value after decarburization of finished product | ≤ 0.01 | 0 |
| SiGB/T 2521 does not specify composition; typical industrial value | 0.8 – 1.6 | 1.2 |
| Al | 0.15 – 0.45 | 0.3 |
| Mn | 0.15 – 0.45 | 0.3 |
| P | ≤ 0.06 | 0.03 |
| S | ≤ 0.01 | 0 |
| N | ≤ 0.01 | 0 |
| Fe | balance |
50W800-SRA — frequently asked
What is 50W800-SRA used for?
50W800-SRA is typically used for fractional-hp motors, fans and pumps. In short: lowest-cost non-oriented grade; best punchability in family; higher core loss trade-off.
What is the yield strength of 50W800-SRA?
50W800-SRA has a typical yield strength of 280 MPa (40.6 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 90% of steel grades.
Is 50W800-SRA easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Fabricated mainly by precision blanking; the material tends to smear on tooling and is burr-sensitive, so use carbide die edges, regrind frequently and hold burr height to 0.02–0.05 mm to prevent interlaminar shorts.
Can 50W800-SRA be welded?
Yes — weldability is rated good (55/100). TIG or laser spot tacking can hold a stack together, but the weld bridges laminations and markedly raises local iron loss — use interlock cleats, riveting or a self-bonding coating instead.
What surface finishes work on 50W800-SRA?
Standard delivery carries a C-5 inorganic or C-6 composite insulating coating and needs no further treatment; bare material requires varnish impregnation, phosphating or an oxide treatment for rust protection and interlaminar insulation.
Can 50W800-SRA be formed, bent or molded?
Blanking and bending behaviour is good thanks to low Si content and high ductility; work hardening in the 2–5 mm zone along cut edges raises core loss, so stress-relief anneal at 750–800 °C where magnetics matter.
What is the maximum service temperature of 50W800-SRA?
50W800-SRA 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.
Sources
- IEC 60404-8-4 / ASTM A677 Non-oriented electrical steel — IEC / ASTM (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — 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.