Steel G35CrNiMo6-6
EN 1.6579
G35CrNiMo6-6 (1.6579) is a chromium-nickel-molybdenum cast alloy steel in the same alloy family as wrought 4340, supplied in +N, +QT1 and +QT2.
Reference datasheet — G35CrNiMo6-6 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 +QT1 condition
G35CrNiMo6-6 tempers and conditions
G35CrNiMo6-6 is supplied in 3 conditions, soft to hard. +QT1 is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Normalized | Pick when moderate strength and uniform structure suffice, or as an intermediate state before machining and final Q&T. | 500 | 780 | 14 | 20 HRC | — |
Quenched and tempered, tough condition | Pick for heavy-section castings or where impact toughness and machinability matter more than peak strength. | 600 | 820 | 15 | 23 HRC | — |
+QT1Default Quenched and tempered, high-strength condition | Default supply condition: highest strength level for gear, crane and press castings up to moderate wall thickness. | 740 | 900 | 12 | 30 HRC | — |
What is G35CrNiMo6-6?
G35CrNiMo6-6 (1.6579) is a chromium-nickel-molybdenum cast alloy steel in the same alloy family as wrought 4340, supplied in +N, +QT1 and +QT2. It is selected when heavy-section castings need high strength with good toughness after heat treatment: the default condition gives 740 MPa yield, 900 MPa tensile, 12 % elongation and 285 HB (30 HRC), with service to 350 °C. Machinability (35) and weldability (28) are both low, cold cracking risk is high, and there is no corrosion resistance, so painting or plating is required. For welded fabrications, G20NiMoCr4 is a more forgiving cast grade. G35CrNiMo6-6 has a density of 7.83 g/cm³ (0.283 lb/in³), lighter than 80% of steel grades. It melts at 1,420°C (2,588 °F). G35CrNiMo6-6 has a yield strength of 740 MPa (107 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 83% of steel grades. Elongation at break is 12% and the elastic modulus is 207 GPa (30 Msi).
What is G35CrNiMo6-6 used for?
- heavy machinery castings
- press frames
- high-strength structural parts
Advantages
- High strength — 740 MPa (107 ksi), better than 83% of steel grades
Limitations
- Limited formability — 8/100, worse than 97% of steel grades
- Limited ductility — 12%, worse than 84% of steel grades
- Difficult to machine — 35/100, worse than 84% of steel grades
G35CrNiMo6-6 properties
Typical room-temperature values for G35CrNiMo6-6-+QT1; bars are the position among steel grades.
Physical3
G35CrNiMo6-6 has a density of 7.83 g/cm³ (0.283 lb/in³), lighter than 80% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
G35CrNiMo6-6 has a yield strength of 740 MPa (107 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 83% of steel grades. Elongation at break is 12% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
G35CrNiMo6-6 is rated for continuous service to 350°C (662 °F). It conducts heat at 37 W/m·K (21.4 BTU/hr·ft·°F), worse than 71% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
G35CrNiMo6-6 conducts electricity at 7.5 % IACS, worse than 67% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of G35CrNiMo6-6 takes about 28 MJ of energy and emits 2.2 kg of CO₂ — less than 56% of steel grades. Typical recycled content is 75%.
Manufacturability8
G35CrNiMo6-6's machinability is fair (35/100, worse than 84% of steel grades); weldability poor (28/100); formability not recommended (8/100).
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. G35CrNiMo6-6 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G35CrNiMo6-6
Is G35CrNiMo6-6 easy to machine?
Machine in +N or after tempering with coated carbide, rigid setups and modest speeds; expect abrasive scale and variable skin on castings — rough before final Q&T where possible.
Can G35CrNiMo6-6 be welded?
Weldable only with qualified procedure: low-hydrogen consumables, 200–300 °C preheat and interpass, and post-weld temper below the original tempering temperature; cold cracking risk is high.
Can G35CrNiMo6-6 be formed, bent or molded?
Supplied as sand or investment castings — design generous fillets, uniform walls and risering to avoid hot tears; no cold forming.
G35CrNiMo6-6 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 |
|---|---|---|
| Cper EN 10293 cast alloy steel | 0.32 – 0.38 | 0.35 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 0.6 – 1 | 0.8 |
| P | ≤ 0.02 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Cr | 1.3 – 1.7 | 1.5 |
| Ni | 1.4 – 1.7 | 1.55 |
| Mo | 0.15 – 0.35 | 0.25 |
| Fe | balance |
What surface finishes work on G35CrNiMo6-6?
Shot-blast, then paint, zinc-rich primer, phosphate or hard chrome/nitride for wear; anodizing is not applicable.
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 G35CrNiMo6-6 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.6579
- Similar grades
- 4340
How much does G35CrNiMo6-6 cost?
G35CrNiMo6-6 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
G35CrNiMo6-6 — frequently asked
What is G35CrNiMo6-6 used for?
G35CrNiMo6-6 is typically used for heavy machinery castings, press frames and high-strength structural parts. In short: cast equivalent of 4340; high strength, poor weldability; deep-hardening heavy sections.
What is the yield strength of G35CrNiMo6-6?
G35CrNiMo6-6 has a typical yield strength of 740 MPa (107 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 83% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is G35CrNiMo6-6 easy to machine?
Not especially — machinability is rated fair (35/100, worse than 84% of steel grades). Machine in +N or after tempering with coated carbide, rigid setups and modest speeds; expect abrasive scale and variable skin on castings — rough before final Q&T where possible.
Can G35CrNiMo6-6 be welded?
Not readily — weldability is rated poor (28/100). Weldable only with qualified procedure: low-hydrogen consumables, 200–300 °C preheat and interpass, and post-weld temper below the original tempering temperature; cold cracking risk is high.
What surface finishes work on G35CrNiMo6-6?
Shot-blast, then paint, zinc-rich primer, phosphate or hard chrome/nitride for wear; anodizing is not applicable.
Can G35CrNiMo6-6 be formed, bent or molded?
Supplied as sand or investment castings — design generous fillets, uniform walls and risering to avoid hot tears; no cold forming.
What is the maximum service temperature of G35CrNiMo6-6?
G35CrNiMo6-6 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does G35CrNiMo6-6 cost?
G35CrNiMo6-6 is a standard-cost steel ($$), 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 10293 — Steel castings for general engineering uses — CEN (2015)
- EN 10027-1/-2 designation systems for steels — CEN (2016)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
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.