Steel SNCM415
JIS SNCM415
SNCM415 is a nickel-chromium-molybdenum case-hardening steel (JIS G 4103, close to AISI 8617) with balanced alloying that keeps hardenability moderate and distortion predictable.
Reference datasheet — SNCM415 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the A condition
SNCM415 tempers and conditions
SNCM415 is supplied in 8 conditions, soft to hard. A is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Choose for cold extrusion / cold heading of gear and shaft preforms and for best tool life in hobbing. | 370 | 590 | 26 | 165 HB | 7.8 % IACS |
ADefault Solution annealed | Standard stock condition: softest, most machinable state for cutting gear teeth prior to carburizing. | 410 | 640 | 23 | 180 HB | — |
Hot rolled | Cheapest mill condition for rough turning of large gear blanks before carburizing. | 450 | 700 | 20 | 14 HRC | 7.5 % IACS |
Normalized | Uniform fine-grain structure for dimensional stability and reduced distortion during later carburizing. | 490 | 720 | 20 | 17 HRC | 7.5 % IACS |
Cold drawn | Bright, close-tolerance bar for small shafts machined with minimal stock removal. | 650 | 780 | 12 | 20 HRC | 7.5 % IACS |
Quenched and tempered | Use when a tough medium-strength part is needed without a hard case (e.g. bolts, non-contact shafts). | 780 | 950 | 17 | 30 HRC | — |
Carbonitrided | Pick for small thin-section gears/pins needing a shallow, very hard, temper-resistant case at lower cost. | 820 | 1,050 | 12 | 61 HRC | 7.2 % IACS |
Carburized & Q&T | Standard finished condition for gears and splines: hard wear/pitting-resistant case over a tough core. | 850 | 1,100 | 12 | 60 HRC | — |
What is SNCM415?
SNCM415 is a nickel-chromium-molybdenum case-hardening steel (JIS G 4103, close to AISI 8617) with balanced alloying that keeps hardenability moderate and distortion predictable. It suits medium-duty precision gears and shafts and is stocked as hot-rolled, annealed, spheroidize-annealed, normalized, cold-drawn, Q&T, carburized to 58–62 HRC and carbonitrided material. Default values are 410 MPa yield, 640 MPa tensile, 23 % elongation, 180 HB, machinability score 55 and formability score 55. It is weldable only before carburizing and has no corrosion resistance; SNCM420 is the step up for higher-load gearing. SNCM415 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). SNCM415 has a yield strength of 410 MPa (59.5 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 57% of steel grades. Elongation at break is 23% and the elastic modulus is 205 GPa (29.7 Msi).
What is SNCM415 used for?
- Precision transmission gears
- Pinion and layshafts
- Cold-headed splined shafts
- Planetary gear carriers
- Gear pump and motor shafts
- Universal joint crosses
- Chain sprockets and cams
Advantages
- Polishes to a fine finish — 65/100, better than 78% of steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 78% of steel grades
SNCM415 properties
Typical room-temperature values for SNCM415-A; bars are the position among steel grades.
Physical3
SNCM415 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
SNCM415 has a yield strength of 410 MPa (59.5 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 57% of steel grades. Elongation at break is 23% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
SNCM415 is rated for continuous service to 300°C (572 °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
SNCM415 conducts electricity at 7.5 % IACS, worse than 67% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of SNCM415 takes about 32 MJ of energy and emits 2.3 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability7
SNCM415's machinability is good (55/100, better than 62% of steel grades); weldability fair (45/100); formability good (55/100).
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. SNCM415 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with SNCM415
Is SNCM415 easy to machine?
Machine soft (160–200 HB annealed) with coated carbide at ~120–180 m/min; leave 0.2–0.4 mm grinding stock for post-carburizing distortion.
Can SNCM415 be welded?
Weldable in the low-carbon uncarburized state with low-hydrogen consumables, 150–250 °C preheat and PWHT; never weld across a carburized case.
Can SNCM415 be formed, bent or molded?
Cold heading/extrusion is practical in spheroidize-annealed condition; hot forge at 1150–950 °C then normalize to refine grain.
SNCM415 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 |
|---|---|---|
| CJIS G 4103 | 0.13 – 0.18 | 0.16 |
| Si | 0.15 – 0.35 | 0.25 |
| Mn | 0.4 – 0.7 | 0.55 |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Ni | 1.6 – 2 | 1.8 |
| Cr | 0.4 – 0.65 | 0.52 |
| Mo | 0.15 – 0.3 | 0.22 |
| Curesidual limit | ≤ 0.3 | |
| Fe | balance |
What surface finishes work on SNCM415?
Not anodizable — use phosphate + oil, black oxide, or Zn/Ni plating (bake to avoid hydrogen embrittlement); ground and honed case polishes well.
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).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel SNCM415 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Similar grades
- 8617
How much does SNCM415 cost?
SNCM415 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.
SNCM415 — frequently asked
What is SNCM415 used for?
SNCM415 is typically used for precision transmission gears, pinion and layshafts, cold-headed splined shafts, planetary gear carriers, gear pump and motor shafts and universal joint crosses. In short: balanced Ni-Cr-Mo carburizing steel; good cold-heading formability; low-distortion gear grade.
What is the yield strength of SNCM415?
SNCM415 has a typical yield strength of 410 MPa (59.5 ksi) and a tensile strength of 640 MPa (92.8 ksi) — weaker than 57% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is SNCM415 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machine soft (160–200 HB annealed) with coated carbide at ~120–180 m/min; leave 0.2–0.4 mm grinding stock for post-carburizing distortion.
Can SNCM415 be welded?
With care — weldability is rated fair (45/100). Weldable in the low-carbon uncarburized state with low-hydrogen consumables, 150–250 °C preheat and PWHT; never weld across a carburized case.
What surface finishes work on SNCM415?
Not anodizable — use phosphate + oil, black oxide, or Zn/Ni plating (bake to avoid hydrogen embrittlement); ground and honed case polishes well.
Can SNCM415 be formed, bent or molded?
Cold heading/extrusion is practical in spheroidize-annealed condition; hot forge at 1150–950 °C then normalize to refine grain.
What is the maximum service temperature of SNCM415?
SNCM415 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between SNCM415-A and SNCM415-CN?
A is the default condition — standard stock condition: softest, most machinable state for cutting gear teeth prior to carburizing. CN: pick for small thin-section gears/pins needing a shallow, very hard, temper-resistant case at lower cost. Yield strength is 410 MPa in A versus 820 MPa in CN.
How much does SNCM415 cost?
SNCM415 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.
Sources
- JIS G 4103 — Nickel-chromium-molybdenum steels — JSA (2018)
- SAE J404 — Chemical Compositions of SAE Alloy Steels (8617) — SAE International (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4A — Steel Heat Treating Fundamentals (carburizing) — ASM International (2013)
- Machinery's Handbook, 31st ed. (machinability ratings) — Industrial Press (2020)
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.