Steel 30KhGSL-AC (Spheroidize annealed)
Heat-treated state
GOST 30KhGSL
Rough/unstressed castings only; coarse dendritic structure with residual casting stresses and low toughness.
Values for the AC condition
Other 30KhGSL tempers and conditions
30KhGSL is listed in 7 conditions; see the grade overview at 30KhGSL.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Chosen for maximum machinability and stress relief before final quench-and-temper. | 320 | 560 | 18 | 11 HRC | 8 % IACS |
Stress relieved | Used after weld repair or rough machining of large castings to remove residual stress without changing strength much. | 370 | 610 | 12 | 15 HRC | 7.8 % IACS |
ACThis page Spheroidize annealed | Rough/unstressed castings only; coarse dendritic structure with residual casting stresses and low toughness. | 380 | 620 | 8 | 19 HRC | 7.8 % IACS |
N+TDefault Normalized and tempered | Standard supply condition for GOST 977 structural castings — balanced strength, ductility and impact toughness. | 430 | 650 | 15 | 207 HB | — |
Normalized | Grain refinement of the as-cast structure; intermediate step or economical condition for lightly loaded castings. | 450 | 700 | 12 | 20 HRC | 7.7 % IACS |
Q&T | Main high-duty condition: sorbitic structure giving ~800 MPa UTS with retained toughness for shafts, levers and mining parts. | 640 | 820 | 12 | 25 HRC | — |
Q&T | Selected when maximum strength/wear resistance is needed and section sizes are moderate; toughness drops noticeably. | 830 | 1,000 | 9 | 33 HRC | — |
What is 30KhGSL-AC?
30KhGSL-AC is 30KhGSL heat treated to AC — rough/unstressed castings only; coarse dendritic structure with residual casting stresses and low toughness. 30KhGSL-AC has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 68% of steel grades. Elongation at break is 8% and the elastic modulus is 205 GPa (29.7 Msi). 30KhGSL-AC has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F). N+T is the default condition FabDigit quotes; AC is available on request or by drawing note.
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
- Hard to polish — 45/100, worse than 84% of steel grades
- Difficult to machine — 40/100, worse than 77% of steel grades
30KhGSL-AC properties
Typical room-temperature values for 30KhGSL-AC; 23 are specific to this condition. Other listed values are 30KhGSL reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
30KhGSL-AC has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
30KhGSL-AC has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 68% of steel grades. Elongation at break is 8% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
30KhGSL-AC is rated for continuous service to 350°C (662 °F). It conducts heat at 38 W/m·K (22 BTU/hr·ft·°F), worse than 69% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
30KhGSL-AC conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 30KhGSL-AC takes about 27 MJ of energy and emits 2.1 kg of CO₂ — less than 59% of steel grades. Typical recycled content is 70%.
Manufacturability8
30KhGSL-AC's machinability is fair (40/100, worse than 77% of steel grades); weldability poor (30/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 30KhGSL-AC
Is 30KhGSL easy to machine?
Machine in the annealed or N+T condition with carbide tooling at moderate speeds; hard skin and sand inclusions on the as-cast surface dull tools quickly, so take a heavy first cut.
Can 30KhGSL be welded?
Limited weldability (CE ≈ 0.7–0.8): use low-hydrogen consumables, 250–350 °C preheat, controlled interpass and a 600–650 °C post-weld temper to avoid HAZ cracking.
Can 30KhGSL be formed, bent or molded?
Sand or shell casting with generous risering and chills; the Cr-Mn-Si chemistry is hot-tear and shrinkage sensitive, so keep uniform sections and avoid abrupt junctions.
What surface finishes work on 30KhGSL?
Not anodizable — protect by shot blasting followed by phosphating, zinc-rich primer/paint or hard chrome/nitriding on wear surfaces.
30KhGSL 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 | 0.25 – 0.35 | 0.3 |
| Si | 0.6 – 0.8 | 0.7 |
| Mn | 0.9 – 1.2 | 1.05 |
| Cr | 0.6 – 0.9 | 0.75 |
| Niresidual | ≤ 0.3 | — |
| Curesidual | ≤ 0.3 | — |
| S | ≤ 0.04 | — |
| P | ≤ 0.04 | — |
| Fe | balance | — |
30KhGSL-AC — frequently asked
What is 30KhGSL-AC used for?
30KhGSL-AC is typically used for heavy machinery structural castings, tank/vehicle components and gear blanks. In short: GOST high-strength cast steel; limited weldability, high CE; best machinability in family.
What is the yield strength of 30KhGSL-AC?
30KhGSL-AC has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 68% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 30KhGSL-AC easy to machine?
Not especially — machinability is rated fair (40/100, worse than 77% of steel grades). Machine in the annealed or N+T condition with carbide tooling at moderate speeds; hard skin and sand inclusions on the as-cast surface dull tools quickly, so take a heavy first cut.
Can 30KhGSL-AC be welded?
Not readily — weldability is rated poor (30/100). Limited weldability (CE ≈ 0.7–0.8): use low-hydrogen consumables, 250–350 °C preheat, controlled interpass and a 600–650 °C post-weld temper to avoid HAZ cracking.
What surface finishes work on 30KhGSL-AC?
Not anodizable — protect by shot blasting followed by phosphating, zinc-rich primer/paint or hard chrome/nitriding on wear surfaces.
Can 30KhGSL-AC be formed, bent or molded?
Sand or shell casting with generous risering and chills; the Cr-Mn-Si chemistry is hot-tear and shrinkage sensitive, so keep uniform sections and avoid abrupt junctions.
What is the maximum service temperature of 30KhGSL-AC?
30KhGSL-AC 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 30KhGSL N+T and 30KhGSL-QT500?
N+T is the default condition — standard supply condition for GOST 977 structural castings — balanced strength, ductility and impact toughness. QT500: selected when maximum strength/wear resistance is needed and section sizes are moderate; toughness drops noticeably. Yield strength is 430 MPa in N+T versus 830 MPa in QT500.
Sources
- GOST 977-88 — Steel castings. General specifications — Gosstandart (1988)
- Marochnik stalej i splavov — 30ХГСЛ cast steel data sheet — Marochnik (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (cast low-alloy steels) — ASM International (1990)
- GB/T 14408 / GB/T 5680 low-alloy steel castings (comparison grade ZG30CrMnSi) — SAC (2014)
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.