FabDigit

Steel G17NiCrMo13-6

EN 1.6781

G17NiCrMo13-6 (1.6781) is a low-carbon, high nickel-chromium-molybdenum cast alloy steel offered in a wide range of conditions (+QT, +QT-heavy, +QT-LT, +QT-high, +N, +NT, +A, +AC, +C).

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Reference datasheet — G17NiCrMo13-6 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 +QT condition

G17NiCrMo13-6 tempers and conditions

G17NiCrMo13-6 is supplied in 9 conditions, soft to hard. +QT is the default FabDigit quotes; the values on this page are for it.

Compare all 9 conditionsHide
Condition · open for datasheetBest forYield MPaTensile MPaElong. %HardnessConductivity
+A
Annealed
Softest supply state for extensive rough machining before final hardening or case hardening.4306602013 HRC6.5 % IACS
+AC
Spheroidize annealed
Rough/blank supply for foundry-to-customer heat treatment; properties are non-uniform and not warranted.4607001021 HRC6 % IACS
+NT
Normalized and tempered
Lower-distortion alternative to Q&T for large or complex castings where full quench strength is not required.5207401720 HRC6 % IACS
+N
Normalized
Grain-refined intermediate condition for castings that will be further machined and then hardened or carburised.5407801422 HRC6 % IACS
+QT-heavy
+QT
Same heat treatment on thick walls; property values fall with reduced quench rate — use for large housings and bases.5907801522 HRC6 % IACS
+QT-LT
+QT low-temperature toughness variant
Higher tempering temperature and tighter melt cleanliness for cryogenic/offshore duty where sub-zero Charpy values are specified.6207901823 HRC6 % IACS
+QTDefault
Quenched and tempered
Standard commercial delivery condition: best strength/toughness balance for gear, drum and heavy machinery castings.6608301625 HRC—
+C
Cold drawn
Choose for cast gear teeth, sprockets and track rollers needing a hard wear case over a tough Ni-Cr-Mo core.7009001260 HRC6 % IACS
+QT-high
+QT low-temper
Lower tempering temperature when maximum strength/hardness is needed and toughness demands are moderate.8201,0001233 HRC6 % IACS

What is G17NiCrMo13-6?

G17NiCrMo13-6 (1.6781) is a low-carbon, high nickel-chromium-molybdenum cast alloy steel offered in a wide range of conditions (+QT, +QT-heavy, +QT-LT, +QT-high, +N, +NT, +A, +AC, +C). The low carbon content gives a good case-hardening response with a tough core, and the default condition provides 660 MPa yield, 830 MPa tensile, 16 % elongation and 255 HB (25 HRC), with service to 400 °C. It is not corrosion resistant and needs preheat and post-weld tempering when welded; for higher as-tempered strength without carburising, G30NiCrMo14 is the nearer choice. G17NiCrMo13-6 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). G17NiCrMo13-6 has a yield strength of 660 MPa (95.7 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 80% of steel grades. Elongation at break is 16% and the elastic modulus is 205 GPa (29.7 Msi).

What is G17NiCrMo13-6 used for?

  • gear and shaft castings
  • heavy machinery components
  • case-hardened structural castings

Advantages

  • High strength — 660 MPa (95.7 ksi), better than 80% of steel grades

Limitations

  • Limited formability — 15/100, worse than 87% of steel grades
  • Low electrical conductivity — 6 % IACS, worse than 78% of steel grades
  • Poor heat conductor — 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 77% of steel grades
  • Difficult to machine — 40/100, worse than 77% of steel grades

G17NiCrMo13-6 properties

Typical room-temperature values for G17NiCrMo13-6-+QT; bars are the position among steel grades.

Physical3

G17NiCrMo13-6 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).

Density7.85 g/cm³0.28 lb/in³
Melting Point (Solidus)1,420°C2,588 °F
Liquidus Temperature1,500°C2,732 °F

Mechanical16

G17NiCrMo13-6 has a yield strength of 660 MPa (95.7 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 80% of steel grades. Elongation at break is 16% and the elastic modulus is 205 GPa (29.7 Msi).

Elastic (Young's) Modulus205 GPa29.7 Msi
Shear Modulus80 GPa11.6 Msi
Bulk Modulus163 GPa23.6 Msi
Poisson's Ratio0.29
Tensile Strength (Ultimate)830 MPa120 ksi
Yield Strength (0.2% offset)660 MPa95.7 ksi
Elongation at Break16%
Reduction in Area45%
Compressive Strength660 MPa95.7 ksi
Shear Strength500 MPa72.5 ksi
Fatigue Strength (Endurance Limit)380 MPa55.1 ksi
Fracture Toughness (K_IC)100 MPa·√m91 ksi·√in
Charpy V-Notch Impact (RT)60 J44.3 ft·lbf
Hardness, Brinell255 HB
Hardness, Rockwell C25 HRC
Hardness, Vickers268 HV

Thermal6

G17NiCrMo13-6 is rated for continuous service to 400°C (752 °F). It conducts heat at 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 77% of steel grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).

Thermal Conductivity34 W/m·K19.6 BTU/hr·ft·°F
Specific Heat Capacity470 J/kg·K0.11 BTU/lb·°F
Thermal Expansion (CTE, 20–100 °C)11.8 µm/m·K6.6 µin/in·°F
Latent Heat of Fusion270 J/g116 BTU/lb
Max Service Temperature (continuous)400°C752 °F
Min Service Temperature-60°C-76 °F

Electrical3

G17NiCrMo13-6 conducts electricity at 6 % IACS, worse than 78% of steel grades.

Electrical Conductivity6 % IACS
Electrical Resistivity3×10⁻⁷ Ω·m11.8 µΩ·in
Magnetic Responseferromagnetic

Chemical & Environmental3

Corrosion resistance is poor (18/100), better than 83% of steel grades.

Galvanic Potential (seawater, vs SCE)-0.6 V
Corrosion ResistancePoor18/100
Chemical Resistance SummaryRusts in humid air and water; no resistance to acids or chlorides. Mildly better atmospheric behaviour than plain carbon steel from Ni/Cr, but coating, galvanising or paint is mandatory; watch hydrogen embrittlement risk when acid pickling or electroplating high-strength conditions.

Sustainability4

Producing a kilogram of G17NiCrMo13-6 takes about 30 MJ of energy and emits 2.4 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 75%.

Embodied Energy (primary production)30 MJ/kg12,898 BTU/lb
Embodied Carbon (primary production)2.4 kg CO₂/kg
Embodied Water60 L/kg7.2 gal/lb
Typical Recycled Content75%

Manufacturability8

G17NiCrMo13-6's machinability is fair (40/100, worse than 77% of steel grades); weldability fair (40/100); formability poor (15/100).

MachinabilityFair40/100
Machinability Rating (AISI 1212 = 100 %)45%
WeldabilityFair40/100
Formability (cold)Poor15/100
CastabilityGood65/100
Brazeability / SolderabilityFair50/100
PolishabilityGood55/100
Anodizing Responsen/a — ferrous alloy; use phosphating, zinc/nickel plating, metallising or paint systems instead

Common Calculations5

Specific Strength (UTS / density)calculated106 kN·m/kg
Specific Stiffness (E / density)calculated26.1 MN·m/kg
Modulus of Resiliencecalculated1,062 kJ/m³
Thermal Diffusivitycalculated9.2 mm²/s
Thermal Shock Resistance Indexcalculated12

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. G17NiCrMo13-6 is highlighted; hover a dot for its name, or open the interactive family chart.

2005001,0002,0007.588.5Density (g/cm³)Yield strength (MPa) — log scaleG17NiCrMo13-6

Working with G17NiCrMo13-6

Is G17NiCrMo13-6 easy to machine?

Rough machine in the annealed or normalized state (carbide, 80–140 m/min); after Q&T at 250 HB use rigid setups, positive-rake coated carbide and generous coolant, and finish-grind carburised surfaces.

Can G17NiCrMo13-6 be welded?

Weldable with matched low-alloy Ni-Cr-Mo consumables under low-hydrogen conditions: preheat 200–250 °C, interpass control, and post-weld temper below the original tempering temperature; foundry weld repairs are best done before final heat treatment.

Can G17NiCrMo13-6 be formed, bent or molded?

Supplied as sand or investment castings — design for progressive solidification with generous fillets and risers; high Ni-Cr-Mo alloy needs low-S/P melt, degassing and full heat treatment to avoid coarse as-cast structure.

G17NiCrMo13-6 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.

ElementSpec limit (wt %)Nominal
Clow carbon for weld repair and carburising0.15 – 0.20.17
Si≤ 0.60.4
Mn0.55 – 0.90.7
P≤ 0.020.01
S≤ 0.020.01
Cr1.3 – 1.81.5
Nihardenability and low-temperature toughness3 – 3.83.3
Mo0.2 – 0.50.35
Vresidual≤ 0.05
Febalance

What surface finishes work on G17NiCrMo13-6?

Not anodizable; shot-blast then phosphate, zinc/nickel plating, thermal spray or paint. Bake after electroplating (190–220 °C) to avoid hydrogen embrittlement in high-strength conditions.

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).

Plating

Organic Coating

Black / Phosphate

Thermal Spray

Equivalent designations

Standards and trade names that resolve to Steel G17NiCrMo13-6 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.

EN / DIN / Werkstoff-Nr.
1.6781

How much does G17NiCrMo13-6 cost?

G17NiCrMo13-6 is a premium-cost steel ($$$), cheaper than about 51% 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.

G17NiCrMo13-6 — frequently asked

What is G17NiCrMo13-6 used for?

G17NiCrMo13-6 is typically used for gear and shaft castings, heavy machinery components and case-hardened structural castings. In short: case-hardenable cast steel; tough core after carburising; widest condition range.

What is the yield strength of G17NiCrMo13-6?

G17NiCrMo13-6 has a typical yield strength of 660 MPa (95.7 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 80% of steel grades. Strength varies by condition: see the 9 listed tempers.

Is G17NiCrMo13-6 easy to machine?

Not especially — machinability is rated fair (40/100, worse than 77% of steel grades). Rough machine in the annealed or normalized state (carbide, 80–140 m/min); after Q&T at 250 HB use rigid setups, positive-rake coated carbide and generous coolant, and finish-grind carburised surfaces.

Can G17NiCrMo13-6 be welded?

With care — weldability is rated fair (40/100). Weldable with matched low-alloy Ni-Cr-Mo consumables under low-hydrogen conditions: preheat 200–250 °C, interpass control, and post-weld temper below the original tempering temperature; foundry weld repairs are best done before final heat treatment.

What surface finishes work on G17NiCrMo13-6?

Not anodizable; shot-blast then phosphate, zinc/nickel plating, thermal spray or paint. Bake after electroplating (190–220 °C) to avoid hydrogen embrittlement in high-strength conditions.

Can G17NiCrMo13-6 be formed, bent or molded?

Supplied as sand or investment castings — design for progressive solidification with generous fillets and risers; high Ni-Cr-Mo alloy needs low-S/P melt, degassing and full heat treatment to avoid coarse as-cast structure.

What is the maximum service temperature of G17NiCrMo13-6?

G17NiCrMo13-6 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.

How much does G17NiCrMo13-6 cost?

G17NiCrMo13-6 is a premium-cost steel ($$$), cheaper than about 51% 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

  1. EN 10293 — Steel castings for general engineering uses — CEN (2015)
  2. EN 10340 — Steel castings for structural uses — CEN (2007)
  3. ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys (steel castings) — ASM International (1990)
  4. Steel Castings Handbook — Steel Founders' Society of America / ASM (1995)
  5. Stahlschlüssel / Key to Steel — material 1.6781 — Verlag Stahlschlüssel Wegst (2019)

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.