Steel 4615-CR (Cold rolled)
Supply condition
AISI/SAE 4615 · UNS G46150
Thin strip/sheet form with better surface and tighter thickness for stamped parts that are later carburized.
Values for the CR condition
Other 4615 tempers and conditions
4615 is listed in 7 conditions; see the grade overview at 4615.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
full anneal, softest condition | Pick for maximum softness and machinability before deep cutting, cold forming or carburizing. | 340 | 520 | 30 | 149 HB | 7.5 % IACS |
HRDefault Hot rolled | Standard stock form for parts that will be machined and then carburized or heat treated. | 350 | 560 | 25 | 163 HB | 7.5 % IACS |
austenitized and air cooled | Use to homogenize forged or hot-worked stock and give a uniform fine-grain core before carburizing. | 380 | 600 | 27 | 174 HB | 7.5 % IACS |
CRThis page Cold rolled | Thin strip/sheet form with better surface and tighter thickness for stamped parts that are later carburized. | 500 | 620 | 14 | 187 HB | 7.5 % IACS |
Cold drawn | Choose for as-drawn dimensional accuracy, straightness and higher yield in screw-machine work. | 540 | 640 | 15 | 192 HB | 7.5 % IACS |
Quenched and tempered | Direct hardening of the low-carbon core for tough, moderately strong shafts and pins where no case is required. | 680 | 850 | 18 | 25 HRC | — |
carburized, quenched and low-temperature tempered (case 58–62 HRC) | The intended service condition: hard wear-resistant case over a tough Ni–Mo core for gears and cams. | 700 | 900 | 13 | 60 HRC | — |
What is 4615-CR?
4615-CR is 4615 supplied in the CR condition — thin strip/sheet form with better surface and tighter thickness for stamped parts that are later carburized. 4615-CR has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 63% of steel grades. Elongation at break is 14% and the elastic modulus is 205 GPa (29.7 Msi). 4615-CR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). HR is the default condition FabDigit quotes; CR is available on request or by drawing note.
Limitations
- Limited ductility — 14%, worse than 75% of steel grades
4615-CR properties
Typical room-temperature values for 4615-CR; 22 are specific to this condition. Other listed values are 4615 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
4615-CR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
4615-CR has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 63% of steel grades. Elongation at break is 14% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
4615-CR is rated for continuous service to 350°C (662 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
4615-CR conducts electricity at 7.5 % IACS, worse than 67% of steel grades.
Chemical & Environmental2
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 4615-CR takes about 29 MJ of energy and emits 2.1 kg of CO₂ — less than 53% of steel grades. Typical recycled content is 30%.
Manufacturability7
4615-CR's machinability is good (60/100, better than 83% of steel grades); weldability fair (52/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 4615-CR
Is 4615 easy to machine?
Machines like other 0.15 %C alloy carburizing steels (~65 % of 1212); normalized stock cuts cleaner than annealed, use sharp tools and positive rake to avoid gumming.
Can 4615 be welded?
Readily arc-welded in the soft condition with low-hydrogen consumables; preheat 100–200 °C on heavy sections and never weld after carburizing.
Can 4615 be formed, bent or molded?
Good cold formability when annealed (bending, upsetting, thread rolling); hot forge 1100–1200 °C and normalize before carburizing.
What surface finishes work on 4615?
No natural corrosion resistance — finish with black oxide, phosphate plus oil, zinc or nickel plating; grind case-hardened surfaces to size after quenching.
4615 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 |
|---|---|---|
| C | 0.13 – 0.18 | 0.16 |
| Mn | 0.45 – 0.65 | 0.55 |
| Si | 0.15 – 0.35 | 0.25 |
| Ni | 1.65 – 2 | 1.82 |
| Mo | 0.2 – 0.3 | 0.25 |
| P | ≤ 0.04 | — |
| S | ≤ 0.04 | — |
| Fe | balance | — |
4615-CR — frequently asked
What is 4615-CR used for?
4615-CR is typically used for gears, forged industrial shafts and pins. In short: carburizing nickel-moly bar.
What is the yield strength of 4615-CR?
4615-CR has a typical yield strength of 500 MPa (72.5 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 63% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 4615-CR easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like other 0.15 %C alloy carburizing steels (~65 % of 1212); normalized stock cuts cleaner than annealed, use sharp tools and positive rake to avoid gumming.
Can 4615-CR be welded?
With care — weldability is rated fair (52/100). Readily arc-welded in the soft condition with low-hydrogen consumables; preheat 100–200 °C on heavy sections and never weld after carburizing.
What surface finishes work on 4615-CR?
No natural corrosion resistance — finish with black oxide, phosphate plus oil, zinc or nickel plating; grind case-hardened surfaces to size after quenching.
Can 4615-CR be formed, bent or molded?
Good cold formability when annealed (bending, upsetting, thread rolling); hot forge 1100–1200 °C and normalize before carburizing.
What is the maximum service temperature of 4615-CR?
4615-CR is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 4615-HR and 4615-CD?
HR is the default condition — standard stock form for parts that will be machined and then carburized or heat treated. CD: choose for as-drawn dimensional accuracy, straightness and higher yield in screw-machine work. Yield strength is 350 MPa in HR versus 540 MPa in CD.
Can FabDigit make parts in 4615-CR?
Yes — 4615-CR is available for CNC machining and 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
- SAE J404 — Chemical Compositions of SAE Alloy Steels — SAE International (2021)
- ASTM A29/A29M — Steel Bars, Carbon and Alloy, Hot-Wrought — ASTM (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4 — Heat Treating (carburizing of Ni-Mo steels) — ASM International (1991)
- ASM Handbook Vol.16 — Machining — ASM International (1989)
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.