Steel CRNGO-SRA
Heat-treated state
SRA = stress-relief annealed after blanking
Use for punched/laser-cut cores where edge work-hardening has raised core loss; recovers most magnetic performance at slightly lower strength.
Values for the SRA condition
Other CRNGO tempers and conditions
CRNGO is listed in 3 conditions; see the grade overview at CRNGO.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SRAThis page Stress-relief annealed after blanking | Use for punched/laser-cut cores where edge work-hardening has raised core loss; recovers most magnetic performance at slightly lower strength. | 300 | 440 | 28 | 155 HB | 3.8 % IACS |
AnnealedDefault fully processed (final annealed, decarburized, insulation coated) | Standard stocked condition: magnetic properties are final at the mill, laminations are punched and stacked with no further heat treatment. | 330 | 470 | 25 | 170 HB | 3.8 % IACS |
semi-processed / as-cold-rolled (customer anneals after blanking) | Pick when the lamination maker performs its own decarburizing/grain-growth anneal after punching to get lower loss and burr-free edges. | 500 | 600 | 10 | 18 HRC | 3.7 % IACS |
What is CRNGO-SRA?
CRNGO-SRA is CRNGO heat treated to SRA — use for punched/laser-cut cores where edge work-hardening has raised core loss; recovers most magnetic performance at slightly lower strength. CRNGO-SRA has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 86% of steel grades. Elongation at break is 28% and the elastic modulus is 200 GPa (29 Msi). CRNGO-SRA has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 97% of steel grades. It melts at 1,500°C (2,732 °F). Annealed is the default condition FabDigit quotes; SRA is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 28%, better than 89% of steel grades
- Forms and bends easily — 62/100, better than 78% of steel grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Poor heat conductor — 26 W/m·K (15 BTU/hr·ft·°F), worse than 87% of steel grades
- Low strength — 300 MPa (43.5 ksi), worse than 86% of steel grades
- Low electrical conductivity — 3.8 % IACS, worse than 84% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
CRNGO-SRA properties
Typical room-temperature values for CRNGO-SRA; 20 are specific to this condition. Other listed values are CRNGO reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
CRNGO-SRA has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 97% of steel grades. It melts at 1,500°C (2,732 °F).
Mechanical15
CRNGO-SRA has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 86% of steel grades. Elongation at break is 28% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
CRNGO-SRA is rated for continuous service to 200°C (392 °F). It conducts heat at 26 W/m·K (15 BTU/hr·ft·°F), worse than 87% of steel grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).
Electrical3
CRNGO-SRA conducts electricity at 3.8 % IACS, worse than 84% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (14/100), better than 70% of steel grades.
Sustainability4
Producing a kilogram of CRNGO-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
CRNGO-SRA's machinability is fair (48/100, worse than 57% of steel grades); weldability fair (52/100); formability good (62/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CRNGO-SRA
Is CRNGO easy to machine?
Rarely machined; thin high-Si sheet is abrasive and burr-prone — use carbide, sharp tooling, and prefer punching, laser or EDM over milling.
Can CRNGO be welded?
TIG/laser welding of lamination stacks is possible but shorts laminations and raises local core loss; keep welds short and outside the flux path.
Can CRNGO be formed, bent or molded?
Optimised for high-speed progressive-die blanking with tight punch-die clearance (~5 % of thickness) and sharp tools; bending/drawing is limited at ≥2.5 % Si.
What surface finishes work on CRNGO?
Supplied with C-3/C-5 insulating coating — do not anodize; avoid grinding or pickling the coating, and stress-relief anneal (750–820 °C, neutral/H₂-N₂) after cutting if loss matters.
CRNGO 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 |
|---|---|---|
| Cvery low to avoid magnetic ageing | ≤ 0.01 | 0 |
| Sigrade-dependent; higher Si = lower loss, lower induction | 0.5 – 3.5 | 2.5 |
| Alraises resistivity, deoxidiser | 0.1 – 0.7 | 0.4 |
| Mn | 0.1 – 0.5 | 0.25 |
| Psometimes added for punchability | ≤ 0.05 | 0.02 |
| S | ≤ 0.01 | 0.01 |
| N | ≤ 0.01 | 0 |
| Tikept low; nitrides pin grains | ≤ 0.01 | 0 |
| Fe | balance | — |
CRNGO-SRA — frequently asked
What is CRNGO-SRA used for?
CRNGO-SRA is typically used for motor stator and rotor laminations, generator cores, small transformer cores, reactor and ballast cores, traction motor lamination stacks and solenoid and relay cores. In short: cold-rolled non-oriented coil.
What is the yield strength of CRNGO-SRA?
CRNGO-SRA has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 440 MPa (63.8 ksi) — weaker than 86% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is CRNGO-SRA easy to machine?
Reasonably — machinability is rated fair (48/100, worse than 57% of steel grades). Rarely machined; thin high-Si sheet is abrasive and burr-prone — use carbide, sharp tooling, and prefer punching, laser or EDM over milling.
Can CRNGO-SRA be welded?
With care — weldability is rated fair (52/100). TIG/laser welding of lamination stacks is possible but shorts laminations and raises local core loss; keep welds short and outside the flux path.
What surface finishes work on CRNGO-SRA?
Supplied with C-3/C-5 insulating coating — do not anodize; avoid grinding or pickling the coating, and stress-relief anneal (750–820 °C, neutral/H₂-N₂) after cutting if loss matters.
Can CRNGO-SRA be formed, bent or molded?
Optimised for high-speed progressive-die blanking with tight punch-die clearance (~5 % of thickness) and sharp tools; bending/drawing is limited at ≥2.5 % Si.
What is the maximum service temperature of CRNGO-SRA?
CRNGO-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.
What is the difference between CRNGO Annealed and CRNGO-SRA?
Annealed is the default condition — standard stocked condition: magnetic properties are final at the mill, laminations are punched and stacked with no further heat treatment. SRA: use for punched/laser-cut cores where edge work-hardening has raised core loss; recovers most magnetic performance at slightly lower strength. Yield strength is 330 MPa in Annealed versus 300 MPa in SRA.
Can FabDigit make parts in CRNGO-SRA?
Yes — CRNGO-SRA 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
- EN 10106 — Cold rolled non-oriented electrical steel strip and sheet delivered in the fully processed state — CEN (2015)
- EN 10341 — Cold rolled electrical non-alloy and alloy steel strip in the semi-processed state — CEN (2006)
- ASTM A677 — Nonoriented Electrical Steel Fully Processed Types — ASTM (2020)
- ASTM A683 — Nonoriented Electrical Steel Semiprocessed Types — ASTM (2019)
- ASTM A976 — Classification of Insulating Coatings for Electrical Steels — ASTM (2019)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels (magnetically soft materials) — ASM International (1990)
- Non-oriented electrical steel product data (M-series / 50W-series grades) — Baosteel / AK Steel / thyssenkrupp (2023)
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.