Steel ZG35CrMo
ZG35CrMo is a quenched-and-tempered chromium-molybdenum cast steel, the cast equivalent of wrought 35CrMo and cross-referenced to ASTM A217 WC6.
Reference datasheet — ZG35CrMo 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 Q&T condition
ZG35CrMo tempers and conditions
ZG35CrMo is supplied in 7 conditions, soft to hard. Q&T 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 |
|---|---|---|---|---|---|---|
Solution annealed | Choose for maximum machinability and dimensional stability before final hardening, or for weld-repair of heavy castings. | 350 | 600 | 17 | 185 HB | — |
As fabricated | Rough non-critical castings only; segregated as-cast structure with low toughness, essentially always heat treated instead. | 390 | 660 | 8 | 17 HRC | 7.8 % IACS |
Normalized and tempered | Standard economical condition for large or thick-section castings where through-quenching is impractical; meets the JB/T 6402 normalized+tempered property class. | 430 | 640 | 15 | 205 HB | — |
Stress relieved | Specify after weld repair or heavy rough machining of N+T / Q&T castings to relieve residual stress with minimal property change. | 540 | 730 | 15 | 20 HRC | 7.8 % IACS |
Q&TDefault Quenched and tempered | Default stocked/ordered condition: best strength-toughness balance for gear blanks, sprockets, rims and highly loaded machine castings. | 570 | 760 | 14 | 23 HRC | — |
Induction hardened | Use for gear teeth and journal surfaces needing a hard wear layer over a tough Q&T core. | 570 | 760 | 11 | 52 HRC | 7.6 % IACS |
Quenched and low-temperature tempered | Pick when higher wear resistance and yield strength are needed (gear rims, crusher parts) and reduced ductility is acceptable. | 760 | 930 | 11 | 31 HRC | — |
What is ZG35CrMo?
ZG35CrMo is a quenched-and-tempered chromium-molybdenum cast steel, the cast equivalent of wrought 35CrMo and cross-referenced to ASTM A217 WC6. In the default Q&T condition it offers 570 MPa yield, 760 MPa tensile, 14 % elongation and 240 HB (23 HRC) with service to 450 °C, which suits medium-to-heavy load-bearing castings such as housings and supports. Weldability is limited (40/100) and machinability moderate (45/100), so preheat and post-weld tempering are required and corrosion protection must be coated on. Where higher strength and hardenability are needed, step up to ZG42CrMo. ZG35CrMo 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). ZG35CrMo has a yield strength of 570 MPa (82.7 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 74% of steel grades. Elongation at break is 14% and the elastic modulus is 208 GPa (30.2 Msi).
What is ZG35CrMo used for?
- Gear housings
- Heavy machinery structural parts
- Shaft supports
Advantages
- High service temperature — 450°C (842 °F), better than 86% of steel grades
Limitations
- Limited formability — 10/100, worse than 95% of steel grades
- Limited ductility — 14%, worse than 75% of steel grades
ZG35CrMo properties
Typical room-temperature values for ZG35CrMo-Q&T; bars are the position among steel grades.
Physical3
ZG35CrMo 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
ZG35CrMo has a yield strength of 570 MPa (82.7 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 74% of steel grades. Elongation at break is 14% and the elastic modulus is 208 GPa (30.2 Msi).
Thermal6
ZG35CrMo is rated for continuous service to 450°C (842 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical2
ZG35CrMo has an electrical resistivity of 2.2×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of ZG35CrMo takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 75%.
Manufacturability7
ZG35CrMo's machinability is fair (45/100, worse than 65% of steel grades); weldability fair (40/100); formability not recommended (10/100).
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. ZG35CrMo is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ZG35CrMo
Is ZG35CrMo easy to machine?
Machine in the annealed or N+T condition where possible; at 217–269 HB use rigid setups, carbide tooling and moderate speeds, and allow for hard scale/skin on unblasted castings.
Can ZG35CrMo be welded?
Weld with low-hydrogen Cr-Mo consumables (e.g. E8018-B2), preheat 250–350 °C, maintain interpass temperature, and post-weld temper below the original tempering temperature.
Can ZG35CrMo be formed, bent or molded?
Sand-cast with generous risering and 2–2.5 % shrinkage allowance; avoid hot tears at section changes and always heat treat to break up the as-cast structure.
ZG35CrMo 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 |
|---|---|---|
| CJB/T 6402 ZG35CrMo | 0.3 – 0.37 | 0.34 |
| Si | 0.3 – 0.6 | 0.45 |
| Mn | 0.5 – 0.8 | 0.65 |
| Cr | 0.8 – 1.2 | 1 |
| Mo | 0.2 – 0.3 | 0.25 |
| Niresidual limit | ≤ 0.3 | |
| Curesidual limit | ≤ 0.3 | |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.04 | 0.02 |
| Fe | balance |
What surface finishes work on ZG35CrMo?
Shot-blast then paint, phosphate or zinc/hard-chrome plate for corrosion protection; nitriding or induction hardening can be applied to wear surfaces.
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 ZG35CrMo in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Similar grades
- A217 WC6
How much does ZG35CrMo cost?
ZG35CrMo 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.
ZG35CrMo — frequently asked
What is ZG35CrMo used for?
ZG35CrMo is typically used for gear housings, heavy machinery structural parts and shaft supports. In short: tough general-purpose Cr-Mo casting; cast equivalent of 35CrMo; more weldable than ZG42CrMo.
What is the yield strength of ZG35CrMo?
ZG35CrMo has a typical yield strength of 570 MPa (82.7 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 74% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is ZG35CrMo easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine in the annealed or N+T condition where possible; at 217–269 HB use rigid setups, carbide tooling and moderate speeds, and allow for hard scale/skin on unblasted castings.
Can ZG35CrMo be welded?
With care — weldability is rated fair (40/100). Weld with low-hydrogen Cr-Mo consumables (e.g. E8018-B2), preheat 250–350 °C, maintain interpass temperature, and post-weld temper below the original tempering temperature.
What surface finishes work on ZG35CrMo?
Shot-blast then paint, phosphate or zinc/hard-chrome plate for corrosion protection; nitriding or induction hardening can be applied to wear surfaces.
Can ZG35CrMo be formed, bent or molded?
Sand-cast with generous risering and 2–2.5 % shrinkage allowance; avoid hot tears at section changes and always heat treat to break up the as-cast structure.
What is the maximum service temperature of ZG35CrMo?
ZG35CrMo is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ZG35CrMo Q&T and ZG35CrMo-A?
Q&T is the default condition — default stocked/ordered condition: best strength-toughness balance for gear blanks, sprockets, rims and highly loaded machine castings. A: choose for maximum machinability and dimensional stability before final hardening, or for weld-repair of heavy castings. Yield strength is 570 MPa in Q&T versus 350 MPa in A.
How much does ZG35CrMo cost?
ZG35CrMo 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
- ASTM A217/A217M (Grade WC6) — ASTM International (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook — Steel Founders' Society of America / ASM (1995)
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.