Steel ZG35CrMnSi-SR (Stress relieved)
Heat-treated state
Used after weld repair or heavy rough machining to remove residual stress without changing strength much.
Values for the SR condition
Other ZG35CrMnSi tempers and conditions
ZG35CrMnSi is listed in 8 conditions; see the grade overview at ZG35CrMnSi.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Softest condition — pick it for rough machining of large castings before final quench and temper. | 340 | 610 | 19 | 180 HB | — |
As fabricated | Cheapest condition for non-critical or later-heat-treated castings; coarse dendritic structure and high residual stress. | 390 | 660 | 8 | 19 HRC | 7.5 % IACS |
SRThis page Stress relieved | Used after weld repair or heavy rough machining to remove residual stress without changing strength much. | 400 | 680 | 12 | 15 HRC | 7.5 % IACS |
N+TDefault Normalized and tempered | Standard supply condition to GB/T 14408 — balanced strength, ductility and toughness for general structural castings. | 460 | 760 | 15 | 20 HRC | — |
Normalized | Grain refinement and homogenization of the as-cast structure; usually followed by tempering. | 500 | 800 | 13 | 22 HRC | 7.4 % IACS |
Q&T 240–280 HB | General quenched-and-tempered condition when higher yield strength with retained toughness is needed in medium sections. | 700 | 900 | 12 | 26 HRC | — |
Q&T 300–340 HB | Higher-strength wear condition for crusher, excavator and mining castings where impact loads are moderate. | 850 | 1,050 | 9 | 34 HRC | — |
Q&T 42–48 HRC | Maximum-hardness wear condition for liners, jaws and shovel teeth; low toughness, avoid high-impact or notched service. | 1,250 | 1,500 | 5 | 45 HRC | — |
What is ZG35CrMnSi-SR?
ZG35CrMnSi-SR is ZG35CrMnSi heat treated to SR — used after weld repair or heavy rough machining to remove residual stress without changing strength much. ZG35CrMnSi-SR has a yield strength of 400 MPa (58 ksi) and a tensile strength of 680 MPa (98.6 ksi) — weaker than 60% of steel grades. Elongation at break is 12% and the elastic modulus is 205 GPa (29.7 Msi). ZG35CrMnSi-SR has a density of 7.82 g/cm³ (0.283 lb/in³), lighter than 82% of steel grades. It melts at 1,420°C (2,588 °F). N+T is the default condition FabDigit quotes; SR is available on request or by drawing note.
Limitations
- Limited formability — 14/100, worse than 90% of steel grades
- Low fracture toughness — 50 MPa·√m (45.5 ksi·√in), worse than 86% of steel grades
- Limited ductility — 12%, worse than 84% of steel grades
ZG35CrMnSi-SR properties
Typical room-temperature values for ZG35CrMnSi-SR; 23 are specific to this condition. Other listed values are ZG35CrMnSi reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
ZG35CrMnSi-SR has a density of 7.82 g/cm³ (0.283 lb/in³), lighter than 82% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical17
ZG35CrMnSi-SR has a yield strength of 400 MPa (58 ksi) and a tensile strength of 680 MPa (98.6 ksi) — weaker than 60% of steel grades. Elongation at break is 12% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
ZG35CrMnSi-SR is rated for continuous service to 400°C (752 °F). It conducts heat at 41 W/m·K (23.7 BTU/hr·ft·°F), worse than 62% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
ZG35CrMnSi-SR 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 ZG35CrMnSi-SR takes about 26 MJ of energy and emits 2.1 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 85%.
Manufacturability7
ZG35CrMnSi-SR's machinability is fair (46/100, worse than 59% of steel grades); weldability fair (36/100); formability not recommended (14/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ZG35CrMnSi-SR
Is ZG35CrMnSi easy to machine?
Machine in the annealed or N+T state with rigid setups and carbide tooling; expect abrasive scale and sand inclusions on unmachined cast surfaces, so take a heavy first cut.
Can ZG35CrMnSi be welded?
Weldable only with care — CE ≈ 0.7–0.8, so preheat 200–300 °C, use low-hydrogen electrodes and stress-relieve or re-temper at 600–650 °C after welding.
Can ZG35CrMnSi be formed, bent or molded?
Sand or shell cast with generous risering and controlled cooling; the Si–Mn content raises hot-tearing risk at section changes, so fillet all junctions and use chills on heavy bosses.
What surface finishes work on ZG35CrMnSi?
Shot blast then prime — the steel rusts quickly; zinc-rich primer, painting, hard chrome or thermal-spray overlays are used, and flame or induction hardening can be applied to wear faces.
ZG35CrMnSi 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 |
|---|---|---|
| C | 0.3 – 0.4 | 0.35 |
| Si | 0.5 – 0.75 | 0.62 |
| Mn | 0.9 – 1.2 | 1.05 |
| Cr | 0.5 – 0.8 | 0.65 |
| Niresidual | ≤ 0.3 | — |
| Curesidual | ≤ 0.3 | — |
| Moresidual | ≤ 0.15 | — |
| Pimpurity max | ≤ 0.04 | — |
| Simpurity max | ≤ 0.04 | — |
| Fe | balance | — |
ZG35CrMnSi-SR — frequently asked
What is ZG35CrMnSi-SR used for?
ZG35CrMnSi-SR is typically used for mining equipment castings, excavator parts and wear-resistant heavy machinery components. In short: high-strength wear casting; hardenable to 45 HRC; weld with strict preheat.
What is the yield strength of ZG35CrMnSi-SR?
ZG35CrMnSi-SR has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 680 MPa (98.6 ksi) — weaker than 60% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is ZG35CrMnSi-SR easy to machine?
Reasonably — machinability is rated fair (46/100, worse than 59% of steel grades). Machine in the annealed or N+T state with rigid setups and carbide tooling; expect abrasive scale and sand inclusions on unmachined cast surfaces, so take a heavy first cut.
Can ZG35CrMnSi-SR be welded?
With care — weldability is rated fair (36/100). Weldable only with care — CE ≈ 0.7–0.8, so preheat 200–300 °C, use low-hydrogen electrodes and stress-relieve or re-temper at 600–650 °C after welding.
What surface finishes work on ZG35CrMnSi-SR?
Shot blast then prime — the steel rusts quickly; zinc-rich primer, painting, hard chrome or thermal-spray overlays are used, and flame or induction hardening can be applied to wear faces.
Can ZG35CrMnSi-SR be formed, bent or molded?
Sand or shell cast with generous risering and controlled cooling; the Si–Mn content raises hot-tearing risk at section changes, so fillet all junctions and use chills on heavy bosses.
What is the maximum service temperature of ZG35CrMnSi-SR?
ZG35CrMnSi-SR 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.
What is the difference between ZG35CrMnSi N+T and ZG35CrMnSi-A?
N+T is the default condition — standard supply condition to GB/T 14408 — balanced strength, ductility and toughness for general structural castings. A: softest condition — pick it for rough machining of large castings before final quench and temper. Yield strength is 460 MPa in N+T versus 340 MPa in A.
Sources
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (cast low-alloy steels) — ASM International (1990)
- ASTM A148/A148M — Steel Castings, High Strength, for Structural Purposes — ASTM (2020)
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.