Steel CRNGO · temper · default condition
Steel CRNGO Annealed
Properties of the Annealed condition, compared with the other CRNGO tempers.
Standard stocked condition: magnetic properties are final at the mill, laminations are punched and stacked with no further heat treatment.
What is CRNGO Annealed?
CRNGO Annealed is CRNGO in the Annealed temper — standard stocked condition: magnetic properties are final at the mill, laminations are punched and stacked with no further heat treatment. CRNGO Annealed 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). CRNGO Annealed 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).
Advantages
- Ductile — tolerates forming and impact — 25%, better than 76% 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 Annealed properties
Typical room-temperature values for CRNGO Annealed — 9 properties are specific to this condition; the rest are grade-level values shared by every CRNGO temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
CRNGO Annealed 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).
Mechanical12
CRNGO Annealed 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 Annealed 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 Annealed conducts electricity at 3.8 % IACS, worse than 84% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of CRNGO Annealed 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 Annealed'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.
Other CRNGO tempers and conditions
CRNGO is also supplied in 2 other conditions. The full side-by-side table is on the CRNGO overview.
- AnnealedDefaultStandard stocked condition: magnetic properties are final at the mill, laminations are punched and stacked with no further heat treatment.330 MPa yield · 78 HRB
- Cold RolledPick when the lamination maker performs its own decarburizing/grain-growth anneal after punching to get lower loss and burr-free edges.500 MPa yield · 95 HRB
Working with CRNGO Annealed
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 Annealed — frequently asked
What is CRNGO Annealed used for?
CRNGO Annealed 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 Annealed?
CRNGO Annealed 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 Annealed 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 Annealed 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 Annealed?
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 Annealed 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 Annealed?
CRNGO Annealed 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 Annealed?
Yes — CRNGO Annealed is available for sheet metal with instant online pricing. 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.