Steel CRNGO
CRNGO is cold-rolled non-grain-oriented electrical steel: a low-carbon Fe-Si(-Al) soft magnetic sheet, typically 0.35–0.65 mm thick with 0.5–3.5 % Si, supplied in coil or blanked laminations with an insulating coating.
Values for the Annealed condition
CRNGO tempers and conditions
CRNGO is supplied in 3 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
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?
CRNGO is cold-rolled non-grain-oriented electrical steel: a low-carbon Fe-Si(-Al) soft magnetic sheet, typically 0.35–0.65 mm thick with 0.5–3.5 % Si, supplied in coil or blanked laminations with an insulating coating. It is chosen for rotating machines (motors, generators, small transformers, ballasts) because its magnetic properties are nearly isotropic in the sheet plane and its added Si/Al raises resistivity to suppress eddy-current loss. Limits are modest mechanical strength, brittleness and poor formability at high Si, reduced saturation induction versus pure iron, essentially no corrosion resistance without the coating, and magnetic degradation from punching stresses, welding or overheating (Curie point ≈ 740 °C). CRNGO 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). CRNGO has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 78% of steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi).
What is CRNGO used for?
- Motor stator and rotor laminations
- Generator cores
- Small transformer cores
- Reactor and ballast cores
- Traction motor lamination stacks
- Solenoid and relay cores
- Compressor motor cores
Advantages
- Ductile — tolerates forming and impact — 25%, better than 77% of steel grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Poor heat conductor — 25 W/m·K (14.4 BTU/hr·ft·°F), worse than 88% 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
- Low strength — 330 MPa (47.9 ksi), worse than 78% of steel grades
CRNGO properties
Typical room-temperature values for CRNGO-Annealed; bars are the position among steel grades.
Physical3
CRNGO 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 has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 78% of steel grades. Elongation at break is 25% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
CRNGO is rated for continuous service to 200°C (392 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), worse than 88% of steel grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).
Electrical3
CRNGO conducts electricity at 3.8 % IACS, worse than 84% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (20/100), better than 87% of steel grades.
Sustainability4
Producing a kilogram of CRNGO 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's machinability is fair (45/100, worse than 65% of steel grades); weldability fair (50/100); formability good (60/100).
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. CRNGO is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CRNGO
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.
Manufacturability
The process limits FabDigit applies to CRNGO. Every CRNGO part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
Sheet metal
| Formability | Better60 / 100 |
|---|---|
| Weldability | Poor50 / 100 |
| Bendable | Yes |
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 |
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.
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 CRNGO in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- Non Grain Oriented Silicon Steel
How much does CRNGO cost?
CRNGO 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.
CRNGO — frequently asked
What is CRNGO used for?
CRNGO 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?
CRNGO has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 78% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is CRNGO easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% 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 be welded?
With care — weldability is rated fair (50/100). 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?
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 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?
CRNGO 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.
How much does CRNGO cost?
CRNGO 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 CRNGO?
Yes — CRNGO 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; 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.