Steel 35A250-A (Solution annealed)
Temper
EN 35A250
Pick for cores that will be welded or stress-relief annealed after stacking; lowest coating build-up, highest stacking factor.
Values for the A condition
Other 35A250 tempers and conditions
35A250 is listed in 3 conditions; see the grade overview at 35A250.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Stress-relief annealed after blanking | Choose when punching/stacking stresses have raised core loss and the last few percent of efficiency matters; slightly softer, magnetically best. | 340 | 470 | 22 | 155 HB | 3.4 % IACS |
AThis page Solution annealed | Pick for cores that will be welded or stress-relief annealed after stacking; lowest coating build-up, highest stacking factor. | 370 | 500 | 16 | 170 HB | 3.3 % IACS |
Organic (resin) insulation coating, high interlaminar resistance | Use where maximum interlaminar resistance and punch lubricity are needed and no post-punch annealing is planned. | 370 | 500 | 16 | 170 HB | 3.3 % IACS |
What is 35A250-A?
35A250-A is 35A250 in the A temper — pick for cores that will be welded or stress-relief annealed after stacking; lowest coating build-up, highest stacking factor. 35A250-A has a yield strength of 370 MPa (53.7 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 70% of steel grades. Elongation at break is 16% and the elastic modulus is 190 GPa (27.6 Msi). 35A250-A has a density of 7.6 g/cm³ (0.275 lb/in³), lighter than 98% of steel grades. It melts at 1,480°C (2,696 °F).
Advantages
- Good corrosion resistance — 22/100, better than 90% of steel grades
Limitations
- Poor heat conductor — 23 W/m·K (13.3 BTU/hr·ft·°F), worse than 92% of steel grades
- Limited service temperature — 230°C (446 °F), worse than 88% of steel grades
- Low electrical conductivity — 3.3 % IACS, worse than 86% of steel grades
- Difficult to machine — 40/100, worse than 77% of steel grades
35A250-A properties
Typical room-temperature values for 35A250-A; 20 are specific to this condition. Other listed values are 35A250 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
35A250-A has a density of 7.6 g/cm³ (0.275 lb/in³), lighter than 98% of steel grades. It melts at 1,480°C (2,696 °F).
Mechanical12
35A250-A has a yield strength of 370 MPa (53.7 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 70% of steel grades. Elongation at break is 16% and the elastic modulus is 190 GPa (27.6 Msi).
Thermal6
35A250-A is rated for continuous service to 230°C (446 °F). It conducts heat at 23 W/m·K (13.3 BTU/hr·ft·°F), worse than 92% of steel grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).
Electrical3
35A250-A conducts electricity at 3.3 % IACS, worse than 86% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (22/100), better than 90% of steel grades.
Sustainability4
Producing a kilogram of 35A250-A takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 15%.
Manufacturability7
35A250-A's machinability is fair (40/100, worse than 77% of steel grades); weldability good (60/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 35A250-A
Is 35A250 easy to machine?
Fabricated almost entirely by precision blanking/progressive-die punching or laser/wire cutting; the high Si+Al content is abrasive, so use carbide dies, tight clearance (~5 % of thickness) and frequent regrind to limit burrs and cut-edge loss.
Can 35A250 be welded?
TIG/laser tack or edge welding of stacks is possible but the fused and heat-affected zone shorts laminations and raises core loss — prefer bonding, cleating or interlocking, and stress-relief anneal after any welding if magnetics are critical.
Can 35A250 be formed, bent or molded?
Good punchability but limited ductility: avoid tight bends, deep drawing or aggressive flattening; keep coil set and residual stress low because plastic strain directly degrades permeability and loss.
What surface finishes work on 35A250?
Supplied pre-coated (inorganic A / semi-organic E / organic C); no further plating or anodizing — protect cut edges with varnish or resin impregnation, and match the coating class to the planned 750 °C stress-relief anneal.
35A250 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 |
|---|---|---|
| Siraises resistivity, lowers eddy-current loss | 2.6 – 3.3 | 3 |
| Al | 0.2 – 0.9 | 0.6 |
| Mn | 0.1 – 0.5 | 0.25 |
| Ckept ultra-low to avoid magnetic ageing | ≤ 0.01 | 0 |
| S | ≤ 0.01 | 0 |
| P | ≤ 0.05 | 0.02 |
| N | ≤ 0 | 0 |
| Fe | balance | — |
35A250-A — frequently asked
What is 35A250-A used for?
35A250-A is typically used for high-efficiency motor stator laminations, servo motor rotor and stator cores, progressive-die blanked lamination packs, bonded lamination stacks and laser-cut prototype laminations. In short: JIS low-loss non-oriented grade; isotropic magnetic properties; three coating classes offered.
What is the yield strength of 35A250-A?
35A250-A has a typical yield strength of 370 MPa (53.7 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 70% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is 35A250-A easy to machine?
Not especially — machinability is rated fair (40/100, worse than 77% of steel grades). Fabricated almost entirely by precision blanking/progressive-die punching or laser/wire cutting; the high Si+Al content is abrasive, so use carbide dies, tight clearance (~5 % of thickness) and frequent regrind to limit burrs and cut-edge loss.
Can 35A250-A be welded?
Yes — weldability is rated good (60/100). TIG/laser tack or edge welding of stacks is possible but the fused and heat-affected zone shorts laminations and raises core loss — prefer bonding, cleating or interlocking, and stress-relief anneal after any welding if magnetics are critical.
What surface finishes work on 35A250-A?
Supplied pre-coated (inorganic A / semi-organic E / organic C); no further plating or anodizing — protect cut edges with varnish or resin impregnation, and match the coating class to the planned 750 °C stress-relief anneal.
Can 35A250-A be formed, bent or molded?
Good punchability but limited ductility: avoid tight bends, deep drawing or aggressive flattening; keep coil set and residual stress low because plastic strain directly degrades permeability and loss.
What is the maximum service temperature of 35A250-A?
35A250-A is rated for continuous use to about 230°C (446 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- JIS C 2552 — Non-oriented electrical steel strip — JSA (2019)
- Non-oriented electrical steel sheet product data (0.35 mm grades) — Nippon Steel / JFE Steel (2023)
- 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.