Steel ZG65Mn N+T
Heat-treated state · default condition
N+T = normalized and tempered
Standard stocked condition: good balance of strength, hardness and impact toughness for crusher and mining wear castings.
Values for the N+T condition
Other ZG65Mn tempers and conditions
ZG65Mn is listed in 8 conditions; see the grade overview at ZG65Mn.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Pick when the casting must be heavily machined or straightened before final hardening. | 350 | 660 | 14 | 195 HB | — |
As fabricated | Cheapest condition for non-critical wear castings where dimensional stability and toughness are secondary. | 400 | 700 | 6 | 225 HB | — |
Stress relieved | Used after welding repair or rough machining to prevent distortion and quench cracking of large castings. | 400 | 720 | 11 | 17 HRC | 8 % IACS |
N+TDefaultThis page Normalized and tempered | Standard stocked condition: good balance of strength, hardness and impact toughness for crusher and mining wear castings. | 560 | 880 | 8 | 25 HRC | — |
Normalized | Refines the coarse as-cast dendritic structure and homogenizes properties before tempering or quenching. | 580 | 930 | 7 | 28 HRC | 8 % IACS |
oil quenched and high tempered (820 °C oil + 500–540 °C) | Choose for impact-dominated parts (jaw plates, hammer bodies) needing toughness more than abrasion life. | 830 | 1,030 | 8 | 33 HRC | — |
oil quenched and medium tempered (820 °C oil + 400–450 °C) | Best all-round wear/impact compromise for liners, blow bars, ripper teeth and track shoes. | 1,050 | 1,250 | 5 | 40 HRC | — |
oil/water quenched and low tempered (810–830 °C + 180–250 °C) | Maximum abrasion resistance for thin-section wear plates and screen parts; brittle, avoid heavy impact and sharp notches. | 1,300 | 1,600 | 2 | 50 HRC | — |
What is ZG65Mn N+T?
ZG65Mn N+T is ZG65Mn heat treated to N+T — standard stocked condition: good balance of strength, hardness and impact toughness for crusher and mining wear castings. ZG65Mn N+T has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 73% of steel grades. Elongation at break is 8% and the elastic modulus is 205 GPa (29.7 Msi). ZG65Mn N+T has a density of 7.81 g/cm³ (0.282 lb/in³), lighter than 84% of steel grades. It melts at 1,420°C (2,588 °F).
Advantages
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
Limitations
- Limited ductility — 8%, worse than 95% of steel grades
- Limited formability — 10/100, worse than 95% of steel grades
- Low fracture toughness — 45 MPa·√m (41 ksi·√in), worse than 90% of steel grades
- Difficult to machine — 38/100, worse than 80% of steel grades
- Difficult to weld — 25/100, worse than 77% of steel grades
ZG65Mn N+T properties
Typical room-temperature values for ZG65Mn N+T; 11 are specific to this condition. Other listed values are ZG65Mn reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
ZG65Mn N+T has a density of 7.81 g/cm³ (0.282 lb/in³), lighter than 84% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
ZG65Mn N+T has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 73% of steel grades. Elongation at break is 8% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
ZG65Mn N+T is rated for continuous service to 350°C (662 °F). It conducts heat at 44 W/m·K (25.4 BTU/hr·ft·°F), better than 57% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
ZG65Mn N+T 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 ZG65Mn N+T takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 70%.
Manufacturability8
ZG65Mn N+T's machinability is fair (38/100, worse than 80% of steel grades); weldability poor (25/100); formability not recommended (10/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ZG65Mn N+T
Is ZG65Mn easy to machine?
Machine in the annealed or normalized+tempered condition with rigid setups and coated carbide (Vc ≈ 60–110 m/min); above 40 HRC switch to CBN/ceramic or finish by grinding.
Can ZG65Mn be welded?
Poor weldability — 0.65 %C gives CE > 0.9; preheat 300–400 °C, use low-hydrogen or austenitic/Mn-steel electrodes, keep interpass hot and stress-relieve at 600–650 °C immediately after.
Can ZG65Mn be formed, bent or molded?
Sand/resin-shell cast with generous risers and 1.9–2.2 % shrink allowance; slow cooling in mould plus immediate normalizing prevents hot tears and coarse dendrites.
What surface finishes work on ZG65Mn?
Shot-blast the casting, then phosphate + paint, zinc-rich primer or oil for storage; hard-facing overlay or induction hardening can be added on high-wear faces. Not anodizable.
ZG65Mn 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 |
|---|---|---|
| Cgrade-defining carbon level | 0.6 – 0.7 | 0.65 |
| Mn | 0.9 – 1.2 | 1.05 |
| Si | 0.2 – 0.5 | 0.35 |
| Pimpurity limit | ≤ 0.04 | — |
| Simpurity limit | ≤ 0.04 | — |
| Crresidual | ≤ 0.3 | — |
| Niresidual | ≤ 0.3 | — |
| Curesidual | ≤ 0.3 | — |
| Moresidual | ≤ 0.15 | — |
| Fe | balance | — |
ZG65Mn N+T — frequently asked
What is ZG65Mn N+T used for?
ZG65Mn N+T is typically used for crusher liners, hammer heads, wear plates and chute liners. In short: wear-resistant spring-steel casting; hardenable to 48–52 HRC; poor weldability.
What is the yield strength of ZG65Mn N+T?
ZG65Mn N+T has a typical yield strength of 560 MPa (81.2 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 73% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is ZG65Mn N+T easy to machine?
Not especially — machinability is rated fair (38/100, worse than 80% of steel grades). Machine in the annealed or normalized+tempered condition with rigid setups and coated carbide (Vc ≈ 60–110 m/min); above 40 HRC switch to CBN/ceramic or finish by grinding.
Can ZG65Mn N+T be welded?
Not readily — weldability is rated poor (25/100). Poor weldability — 0.65 %C gives CE > 0.9; preheat 300–400 °C, use low-hydrogen or austenitic/Mn-steel electrodes, keep interpass hot and stress-relieve at 600–650 °C immediately after.
What surface finishes work on ZG65Mn N+T?
Shot-blast the casting, then phosphate + paint, zinc-rich primer or oil for storage; hard-facing overlay or induction hardening can be added on high-wear faces. Not anodizable.
Can ZG65Mn N+T be formed, bent or molded?
Sand/resin-shell cast with generous risers and 1.9–2.2 % shrink allowance; slow cooling in mould plus immediate normalizing prevents hot tears and coarse dendrites.
What is the maximum service temperature of ZG65Mn N+T?
ZG65Mn N+T 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.
What is the difference between ZG65Mn N+T and ZG65Mn-A?
N+T is the default condition — standard stocked condition: good balance of strength, hardness and impact toughness for crusher and mining wear castings. A: pick when the casting must be heavily machined or straightened before final hardening. Yield strength is 560 MPa in N+T versus 350 MPa in A.
Sources
- GB/T 1222 (65Mn chemistry reference) — SAC (2016)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4 — Heat Treating — ASM International (1991)
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.