Steel 17CrNi6-6
EN 17CrNi6-6
17CrNi6-6 (1.5918, comparable to AISI 9310) is a chromium-nickel case-hardening steel in the EN 10084 family, carburized to give a hard wear-resistant case over a tough, fatigue-resistant low-carbon core.
Reference datasheet — 17CrNi6-6 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 +FP condition
17CrNi6-6 tempers and conditions
17CrNi6-6 is supplied in 7 conditions, soft to hard. +FP is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Choose for cold forming, cold heading or deep drilling where the lowest hardness and best ductility are needed. | 330 | 560 | 22 | 165 HB | — |
Treated for shearability | Pick for coil/bar that must be cold-sheared or cropped into blanks before machining and carburizing. | 360 | 600 | 19 | 175 HB | 7 % IACS |
+FPDefault Annealed to a ferrite–pearlite structure and hardness range | Standard gear-blank delivery condition: uniform ferrite–pearlite gives predictable machining and low distortion in carburizing. | 375 | 620 | 18 | 180 HB | — |
Normalized | Use to refine grain and homogenize forgings before soft annealing or machining. | 420 | 680 | 17 | 14 HRC | 7 % IACS |
Spheroidize annealed and cold drawn | Precision bright bar for automatic-lathe parts and pins: tight tolerance, higher yield, straighter chips. | 560 | 700 | 10 | 210 HB | — |
Hardenability-guaranteed (Jominy) quality, supplied hardened/tempered… | Specify when Jominy end-quench hardenability must be guaranteed and the part is hardened and tempered to a defined core strength. | 850 | 1,100 | 11 | 34 HRC | — |
Carburized and hardened | Final in-service condition for gears and shafts: hard, wear- and pitting-resistant case over a tough Cr-Ni core. | 900 | 1,200 | 9 | 60 HRC | — |
What is 17CrNi6-6?
17CrNi6-6 (1.5918, comparable to AISI 9310) is a chromium-nickel case-hardening steel in the EN 10084 family, carburized to give a hard wear-resistant case over a tough, fatigue-resistant low-carbon core. It is chosen for heavily loaded automotive and aerospace gears and is supplied as bar, forging stock and tube in +S, +FP, +N, +AC, +AC+C, +H and CH conditions; core properties are about 375 MPa yield, 620 MPa tensile, 18 % elongation and 180 HB, with service to 350 °C. Weldability is restricted (score 42) and the nickel makes the soft state gummy (machinability 52), so machine before carburizing and grind afterwards. 17CrNi6-6 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). 17CrNi6-6 has a yield strength of 375 MPa (54.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 70% of steel grades. Elongation at break is 18% and the elastic modulus is 210 GPa (30.5 Msi).
What is 17CrNi6-6 used for?
- transmission gears
- gearbox shafts
- aerospace gears
Advantages
- Polishes to a fine finish — 65/100, better than 78% of steel grades
17CrNi6-6 properties
Typical room-temperature values for 17CrNi6-6-+FP; bars are the position among steel grades.
Physical3
17CrNi6-6 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
17CrNi6-6 has a yield strength of 375 MPa (54.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 70% of steel grades. Elongation at break is 18% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
17CrNi6-6 is rated for continuous service to 350°C (662 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 64% of steel grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).
Electrical3
17CrNi6-6 conducts electricity at 7 % IACS, worse than 74% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (16/100), better than 79% of steel grades.
Sustainability4
Producing a kilogram of 17CrNi6-6 takes about 31 MJ of energy and emits 2.2 kg of CO₂ — more than 64% of steel grades. Typical recycled content is 30%.
Manufacturability8
17CrNi6-6's machinability is fair (52/100, better than 52% of steel grades); weldability fair (42/100); formability fair (50/100).
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. 17CrNi6-6 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 17CrNi6-6
Is 17CrNi6-6 easy to machine?
Machine in +FP or +AC before carburizing; coated carbide, moderate speeds and rigid setups — nickel content makes it gummy in the fully soft state, so finish-grind after hardening.
Can 17CrNi6-6 be welded?
Weldable only with care: preheat 200–300 °C, low-hydrogen consumables and immediate stress relief; never weld carburized surfaces.
Can 17CrNi6-6 be formed, bent or molded?
Hot forge 1100–850 °C followed by normalizing; cold heading and drawing are practical only in the spheroidized (+AC) condition.
17CrNi6-6 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 | 0.14 – 0.2 | 0.17 |
| Simax per EN 10084 | ≤ 0.4 | 0.25 |
| Mn | 0.6 – 0.9 | 0.75 |
| P | ≤ 0.03 | 0.01 |
| Smax; +S variant 0.020–0.040 for machinability | ≤ 0.04 | 0.02 |
| Cr | 1.4 – 1.7 | 1.55 |
| Ni | 1.4 – 1.7 | 1.55 |
| Moresidual, not specified | ≤ 0.1 | 0.03 |
| Fe | balance |
What surface finishes work on 17CrNi6-6?
Case-hardened parts are hard-turned or ground and honed; protect with oil, manganese phosphate, black oxide or zinc plating (bake to avoid hydrogen embrittlement).
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 17CrNi6-6 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.5918
- Similar grades
- 9310
How much does 17CrNi6-6 cost?
17CrNi6-6 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.
17CrNi6-6 — frequently asked
What is 17CrNi6-6 used for?
17CrNi6-6 is typically used for transmission gears, gearbox shafts and aerospace gears. In short: aerospace gear steel; tough carburized core; AISI 9310 equivalent.
What is the yield strength of 17CrNi6-6?
17CrNi6-6 has a typical yield strength of 375 MPa (54.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 70% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 17CrNi6-6 easy to machine?
Reasonably — machinability is rated fair (52/100, better than 52% of steel grades). Machine in +FP or +AC before carburizing; coated carbide, moderate speeds and rigid setups — nickel content makes it gummy in the fully soft state, so finish-grind after hardening.
Can 17CrNi6-6 be welded?
With care — weldability is rated fair (42/100). Weldable only with care: preheat 200–300 °C, low-hydrogen consumables and immediate stress relief; never weld carburized surfaces.
What surface finishes work on 17CrNi6-6?
Case-hardened parts are hard-turned or ground and honed; protect with oil, manganese phosphate, black oxide or zinc plating (bake to avoid hydrogen embrittlement).
Can 17CrNi6-6 be formed, bent or molded?
Hot forge 1100–850 °C followed by normalizing; cold heading and drawing are practical only in the spheroidized (+AC) condition.
What is the maximum service temperature of 17CrNi6-6?
17CrNi6-6 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 17CrNi6-6 +FP and 17CrNi6-6-CH?
+FP is the default condition — standard gear-blank delivery condition: uniform ferrite–pearlite gives predictable machining and low distortion in carburizing. CH: final in-service condition for gears and shafts: hard, wear- and pitting-resistant case over a tough Cr-Ni core. Yield strength is 375 MPa in +FP versus 900 MPa in CH.
How much does 17CrNi6-6 cost?
17CrNi6-6 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
- EN 10084 — Case hardening steels: technical delivery conditions — CEN (2008)
- EN 10277 — Bright steel products, technical delivery conditions — CEN (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4A — Steel Heat Treating Fundamentals and Processes — ASM International (2013)
- Case hardening steel 1.5918 / 17CrNi6-6 data sheet — Ovako / Deutsche Edelstahlwerke (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.