Steel 17CrNiMo6 +S (Treated for shearability)
Heat-treated state
EN 17CrNiMo6
Pick for cold shear cut-off and cold forging or upsetting, where the softening treatment for shearability prepares bar stock at about 225 HB for gear blank forging.
Values for the +S condition
Other 17CrNiMo6 tempers and conditions
17CrNiMo6 is listed in 7 conditions; see the grade overview at 17CrNiMo6.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Treated to ferrite-pearlite structure | Choose when a controlled ferrite-pearlite structure at about 175 HB is needed for consistent cutting behaviour and good machined surface quality on precision gear blanks. | 390 | 620 | 22 | 175 HB | 8.5 % IACS |
AnnealedDefault soft annealed (≤229 HB), machining condition | Pick the usual supply state — soft annealed bar or forgings at ≤229 HB — for rough turning and gear hobbing before carburizing and quenching to the final case hardness. | 430 | 700 | 20 | 200 HB | — |
Treated to a specified hardness range | Use when bar is ordered to an agreed hardness band near 205 HB, so dimensions and tool life stay predictable on automated turning lines in volume production. | 450 | 720 | 18 | 205 HB | 8 % IACS |
+SThis page Treated for shearability | Pick for cold shear cut-off and cold forging or upsetting, where the softening treatment for shearability prepares bar stock at about 225 HB for gear blank forging. | 480 | 780 | 16 | 20 HRC | 8 % IACS |
normalized bar/forging | Choose after forging to refine and homogenize the structure at about 260 HB; use as an intermediate state before rough machining, quench and temper, or carburizing. | 560 | 880 | 15 | 26 HRC | 8 % IACS |
Hot Rolled / as-rolled (+U, untreated) | Pick the untreated as-rolled bar as the cheapest starting stock only when forging or a full heat-treatment cycle follows, since 270 HB makes machining more difficult. | 560 | 900 | 14 | 27 HRC | 8 % IACS |
Carburized, hardened & tempered | Choose as the final service condition: carburized, hardened and tempered to a 58–62 HRC case over a tough core for heavy gear flank contact and tooth-root bending fatigue. | 900 | 1,200 | 9 | 60 HRC | — |
What is 17CrNiMo6 +S?
17CrNiMo6 +S is 17CrNiMo6 heat treated to +S — pick for cold shear cut-off and cold forging or upsetting, where the softening treatment for shearability prepares bar stock at about 225 HB for gear blank forging. 17CrNiMo6 +S has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 59% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi). 17CrNiMo6 +S has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F). Annealed is the default condition FabDigit quotes; +S is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 65/100, better than 78% of steel grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
17CrNiMo6 +S properties
Typical room-temperature values for 17CrNiMo6 +S; 23 are specific to this condition. Other listed values are 17CrNiMo6 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
17CrNiMo6 +S has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical14
17CrNiMo6 +S has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 59% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
17CrNiMo6 +S is rated for continuous service to 200°C (392 °F). It conducts heat at 38 W/m·K (22 BTU/hr·ft·°F), worse than 69% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
17CrNiMo6 +S conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 17CrNiMo6 +S takes about 32 MJ of energy and emits 2.3 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 30%.
Manufacturability8
17CrNiMo6 +S's machinability is fair (48/100, worse than 57% of steel grades); weldability poor (30/100); formability fair (48/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 17CrNiMo6 +S
Is 17CrNiMo6 easy to machine?
In the annealed condition (≤229 HB) turn, mill and hob normally with coated carbide; after carburizing and quenching only grinding or CBN hard turning is practical.
Can 17CrNiMo6 be welded?
Poor weldability: high carbon equivalent and cold-cracking sensitivity require 250-350 °C preheat, low-hydrogen consumables and prompt post-heat for hydrogen removal; do not weld in carburized areas.
Can 17CrNiMo6 be formed, bent or molded?
Suited to hot forging and hot rolling at 1100-1250 °C, followed by normalizing or annealing; cold formability is limited to cold shearing and light upsetting/extrusion in the +S condition.
What surface finishes work on 17CrNiMo6?
Cannot be anodized. Usual route is gear grinding plus shot peening to raise root fatigue strength, then black oxide, phosphating or rust-preventive oil; non-tooth surfaces can be zinc-nickel plated or painted.
17CrNiMo6 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 |
|---|---|---|
| C0.15–0.20 per DIN 17210 (17CrNiMo6); 0.15–0.21 per EN 10084 (18CrNiMo7-6) | 0.15 – 0.21 | 0.18 |
| Si | ≤ 0.4 | 0.25 |
| Mn0.40–0.60 per old DIN 17210; 0.50–0.90 per EN 10084 | 0.4 – 0.9 | 0.65 |
| P≤0.035 per older DIN | ≤ 0.03 | — |
| Scontrolled-S variants 0.020–0.035 for machinability | ≤ 0.04 | — |
| Cr | 1.5 – 1.8 | 1.65 |
| Ni | 1.4 – 1.7 | 1.55 |
| Mo | 0.25 – 0.35 | 0.3 |
| Fe | balance | — |
17CrNiMo6 +S — frequently asked
What is 17CrNiMo6 +S used for?
17CrNiMo6 +S is typically used for gears, industrial drive shafts and pins. In short: premium carburizing gear steel.
What is the yield strength of 17CrNiMo6 +S?
17CrNiMo6 +S has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 59% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 17CrNiMo6 +S easy to machine?
Reasonably — machinability is rated fair (48/100, worse than 57% of steel grades). In the annealed condition (≤229 HB) turn, mill and hob normally with coated carbide; after carburizing and quenching only grinding or CBN hard turning is practical.
Can 17CrNiMo6 +S be welded?
Not readily — weldability is rated poor (30/100). Poor weldability: high carbon equivalent and cold-cracking sensitivity require 250-350 °C preheat, low-hydrogen consumables and prompt post-heat for hydrogen removal; do not weld in carburized areas.
What surface finishes work on 17CrNiMo6 +S?
Cannot be anodized. Usual route is gear grinding plus shot peening to raise root fatigue strength, then black oxide, phosphating or rust-preventive oil; non-tooth surfaces can be zinc-nickel plated or painted.
Can 17CrNiMo6 +S be formed, bent or molded?
Suited to hot forging and hot rolling at 1100-1250 °C, followed by normalizing or annealing; cold formability is limited to cold shearing and light upsetting/extrusion in the +S condition.
What is the maximum service temperature of 17CrNiMo6 +S?
17CrNiMo6 +S 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.
Can FabDigit make parts in 17CrNiMo6 +S?
Yes — 17CrNiMo6 +S 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
- EN 10084 — Case hardening steels: technical delivery conditions — CEN (2008)
- DIN 17210 (withdrawn) — Case hardening steels (17CrNiMo6) — DIN (1987)
- 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)
- 18CrNiMo7-6 / 1.6587 gear steel datasheet — Ovako / Böhler-Deutschland (2022)
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.