Steel G35CrNiMo6-6 +QT2
Heat-treated state
EN 1.6579
+QT2 = quenched and tempered, tough condition
Pick for heavy-section castings or where impact toughness and machinability matter more than peak strength.
Values for the +QT2 condition
Other G35CrNiMo6-6 tempers and conditions
G35CrNiMo6-6 is listed in 3 conditions; see the grade overview at G35CrNiMo6-6.
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 | — |
+QT2This page 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 +QT2?
G35CrNiMo6-6 +QT2 is G35CrNiMo6-6 heat treated to +QT2 — pick for heavy-section castings or where impact toughness and machinability matter more than peak strength. G35CrNiMo6-6 +QT2 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 77% of steel grades. Elongation at break is 15% and the elastic modulus is 207 GPa (30 Msi). G35CrNiMo6-6 +QT2 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). +QT1 is the default condition FabDigit quotes; +QT2 is available on request or by drawing note.
Advantages
- High strength — 600 MPa (87 ksi), better than 77% of steel grades
Limitations
- Limited formability — 8/100, worse than 97% of steel grades
G35CrNiMo6-6 +QT2 properties
Typical room-temperature values for G35CrNiMo6-6 +QT2; 17 are specific to this condition. Other listed values are G35CrNiMo6-6 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
G35CrNiMo6-6 +QT2 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 +QT2 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 77% of steel grades. Elongation at break is 15% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
G35CrNiMo6-6 +QT2 is rated for continuous service to 400°C (752 °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 +QT2 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 +QT2 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 +QT2's machinability is fair (42/100, worse than 73% of steel grades); weldability poor (32/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with G35CrNiMo6-6 +QT2
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.
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.
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 | — |
G35CrNiMo6-6 +QT2 — frequently asked
What is G35CrNiMo6-6 +QT2 used for?
G35CrNiMo6-6 +QT2 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 +QT2?
G35CrNiMo6-6 +QT2 has a typical yield strength of 600 MPa (87 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 77% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is G35CrNiMo6-6 +QT2 easy to machine?
Not especially — machinability is rated fair (42/100, worse than 73% 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 +QT2 be welded?
Not readily — weldability is rated poor (32/100). 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 +QT2?
Shot-blast, then paint, zinc-rich primer, phosphate or hard chrome/nitride for wear; anodizing is not applicable.
Can G35CrNiMo6-6 +QT2 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 +QT2?
G35CrNiMo6-6 +QT2 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.