Steel G26CrMo4
EN 1.7221
G26CrMo4 (1.7221) is a low-carbon chromium-molybdenum cast alloy steel from the low-alloy cast steel family, composition-comparable to wrought 4130 and supplied in +A, +N, +QT1 and +QT2 conditions.
Reference datasheet — G26CrMo4 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 +QT1 condition
G26CrMo4 tempers and conditions
G26CrMo4 is supplied in 4 conditions, soft to hard. +QT1 is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for maximum machinability and stress-free rough machining before final quench and temper. | 300 | 520 | 22 | 155 HB | — |
Normalized | Pick for thick, geometrically awkward castings where quench distortion or cracking is a risk and mid-range strength suffices. | 320 | 550 | 20 | 170 HB | — |
+QT1Default Quenched and tempered, lower strength / higher toughness class | Default stock condition: balanced 500–650 MPa strength with high Charpy energy for pressure-retaining and general machinery castings. | 340 | 570 | 20 | 175 HB | — |
Quenched and tempered, higher strength class | Pick when higher yield strength (≈450 MPa class) is needed for gear housings, links and highly loaded machinery castings, accepting lower ductility and toughness. | 490 | 680 | 15 | 20 HRC | — |
What is G26CrMo4?
G26CrMo4 (1.7221) is a low-carbon chromium-molybdenum cast alloy steel from the low-alloy cast steel family, composition-comparable to wrought 4130 and supplied in +A, +N, +QT1 and +QT2 conditions. It is chosen for medium-strength machinery and pressure castings that must be machined and welded, with default values of 340 MPa yield, 570 MPa tensile, 20 % elongation and 175 HB (88 HRB) up to 480 °C service. It has essentially no corrosion resistance (score 12) and always needs coating; welding (score 55) requires preheat and PWHT. Where higher strength is needed, G34CrMo4 or G42CrMo4 are the direct step up. G26CrMo4 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). G26CrMo4 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 76% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
What is G26CrMo4 used for?
- machinery housings
- pressure part castings
- general engineering components
Advantages
- High service temperature — 480°C (896 °F), better than 88% of steel grades
Limitations
- Limited formability — 20/100, worse than 80% of steel grades
- Low strength — 340 MPa (49.3 ksi), worse than 76% of steel grades
G26CrMo4 properties
Typical room-temperature values for G26CrMo4-+QT1; bars are the position among steel grades.
Physical3
G26CrMo4 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
G26CrMo4 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 76% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G26CrMo4 is rated for continuous service to 480°C (896 °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).
Electrical3
G26CrMo4 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 G26CrMo4 takes about 27 MJ of energy and emits 2.1 kg of CO₂ — less than 59% of steel grades. Typical recycled content is 80%.
Manufacturability7
G26CrMo4's machinability is good (58/100, better than 75% of steel grades); weldability good (55/100); formability poor (20/100).
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. G26CrMo4 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G26CrMo4
Is G26CrMo4 easy to machine?
Machine in the annealed or +QT1 condition with carbide tooling at moderate speed and heavy feed; +QT2 at 215+ HB needs rigid setups and coolant to avoid work-hardened skins on cast surfaces.
Can G26CrMo4 be welded?
Weldable with low-hydrogen electrodes or GTAW/GMAW; preheat 200–250 °C, keep interpass temperature and apply 620–680 °C PWHT, then re-temper the casting after major repairs.
Can G26CrMo4 be formed, bent or molded?
Sand or investment cast; requires generous risers and chills because of the low-alloy shrinkage (~2 %), plus a full normalize or austenitize cycle to break up as-cast dendritic structure.
G26CrMo4 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 | 0.22 – 0.29 | 0.26 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 0.5 – 1 | 0.75 |
| P0.025 max in some product standards | ≤ 0.02 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Cr | 0.8 – 1.2 | 1 |
| Mo | 0.15 – 0.3 | 0.22 |
| Niresidual | ≤ 0.4 | |
| Curesidual | ≤ 0.3 | |
| Vresidual | ≤ 0.05 | |
| Fe | balance |
What surface finishes work on G26CrMo4?
No native corrosion barrier — shot blast then paint, zinc-rich primer, phosphate or hard chrome/nitride the wear faces; polishes reasonably but subsurface porosity can open up.
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 G26CrMo4 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.7221
- Similar grades
- 4130
How much does G26CrMo4 cost?
G26CrMo4 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
G26CrMo4 — frequently asked
What is G26CrMo4 used for?
G26CrMo4 is typically used for machinery housings, pressure part castings and general engineering components. In short: cast 4130-family steel; most weldable cast CrMo; medium-strength pressure castings.
What is the yield strength of G26CrMo4?
G26CrMo4 has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 76% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is G26CrMo4 easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machine in the annealed or +QT1 condition with carbide tooling at moderate speed and heavy feed; +QT2 at 215+ HB needs rigid setups and coolant to avoid work-hardened skins on cast surfaces.
Can G26CrMo4 be welded?
Yes — weldability is rated good (55/100). Weldable with low-hydrogen electrodes or GTAW/GMAW; preheat 200–250 °C, keep interpass temperature and apply 620–680 °C PWHT, then re-temper the casting after major repairs.
What surface finishes work on G26CrMo4?
No native corrosion barrier — shot blast then paint, zinc-rich primer, phosphate or hard chrome/nitride the wear faces; polishes reasonably but subsurface porosity can open up.
Can G26CrMo4 be formed, bent or molded?
Sand or investment cast; requires generous risers and chills because of the low-alloy shrinkage (~2 %), plus a full normalize or austenitize cycle to break up as-cast dendritic structure.
What is the maximum service temperature of G26CrMo4?
G26CrMo4 is rated for continuous use to about 480°C (896 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does G26CrMo4 cost?
G26CrMo4 is a standard-cost steel ($$), 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
- EN 10293 — Steel castings for general engineering uses — CEN (2015)
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook, 6th ed. — SFSA / ASM International (1995)
- Stahlschlüssel / Key to Steel — material 1.7221 — Verlag Stahlschlüssel Wegst (2023)
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.