Steel GE240 +QT (Quenched and tempered)
Heat-treated state
EN 1.0446
Choose when higher yield strength and uniform properties through thicker sections are needed while keeping weldability.
Values for the +QT condition
Other GE240 tempers and conditions
GE240 is listed in 4 conditions; see the grade overview at GE240.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition for heavy machining or subsequent forming/heat treatment; lowest strength. | 230 | 440 | 27 | 130 HB | 10.5 % IACS |
As fabricated | Economy option for low-stress, non-impact parts where only stress relief is applied; properties are less uniform than +N. | 245 | 460 | 18 | 145 HB | 10 % IACS |
+NDefault Normalized | Standard supply condition: normalizing refines the as-cast dendritic structure and gives the specified 240 MPa yield with good toughness. | 265 | 480 | 24 | 145 HB | — |
+QTThis page Quenched and tempered | Choose when higher yield strength and uniform properties through thicker sections are needed while keeping weldability. | 330 | 550 | 22 | 175 HB | — |
What is GE240 +QT?
GE240 +QT is GE240 heat treated to +QT — choose when higher yield strength and uniform properties through thicker sections are needed while keeping weldability. GE240 +QT has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 78% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi). GE240 +QT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,470°C (2,678 °F). +N is the default condition FabDigit quotes; +QT is available on request or by drawing note.
Advantages
- Easy to machine — 62/100, better than 89% of steel grades
- High electrical conductivity — 10 % IACS, better than 83% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
- Readily welded — 78/100, better than 78% of steel grades
Limitations
- Limited formability — 20/100, worse than 80% of steel grades
- Low strength — 330 MPa (47.9 ksi), worse than 78% of steel grades
GE240 +QT properties
Typical room-temperature values for GE240 +QT; 10 are specific to this condition. Other listed values are GE240 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
GE240 +QT has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,470°C (2,678 °F).
Mechanical16
GE240 +QT has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 78% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
GE240 +QT is rated for continuous service to 400°C (752 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
GE240 +QT conducts electricity at 10 % IACS, better than 83% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of GE240 +QT takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 85%.
Manufacturability7
GE240 +QT's machinability is good (62/100, better than 89% of steel grades); weldability very good (78/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with GE240 +QT
Is GE240 easy to machine?
Machines like normalized 1020–1025 steel (~65 % of AISI 1212); use rigid setups and carbide tooling, and expect abrasive cast skin — take a deep first cut through the scale.
Can GE240 be welded?
Readily weldable by SMAW/GMAW/SAW with low-hydrogen consumables (E7018 class); preheat 100–150 °C for sections over ~30 mm and stress-relieve at 580–620 °C after major repair welds.
Can GE240 be formed, bent or molded?
Sand or investment cast with generous feeders and chills — steel shrinks ~2 % and needs strong risering; normalize after casting for uniform properties.
What surface finishes work on GE240?
No inherent corrosion resistance: shot-blast then prime/paint, zinc-spray, hot-dip galvanize or phosphate; can be flame or induction surface hardened only marginally due to low carbon.
GE240 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 |
|---|---|---|
| CEN 10293 ladle analysis | ≤ 0.23 | 0.2 |
| Si | ≤ 0.6 | 0.4 |
| Mn | ≤ 1.2 | 0.9 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Crresidual | ≤ 0.35 | 0.1 |
| Niresidual | ≤ 0.4 | 0.15 |
| Curesidual | ≤ 0.35 | 0.15 |
| Moresidual | ≤ 0.15 | 0.04 |
| Vresidual; total residuals ≤ 1.00 % | ≤ 0.05 | 0.01 |
| Fe | balance | — |
GE240 +QT — frequently asked
What is GE240 +QT used for?
GE240 +QT is typically used for machine bases, gear housings, pump bodies and general engineering castings. In short: medium-strength cast steel; highly weldable casting grade; stronger than GE200.
What is the yield strength of GE240 +QT?
GE240 +QT has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 78% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is GE240 +QT easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Machines like normalized 1020–1025 steel (~65 % of AISI 1212); use rigid setups and carbide tooling, and expect abrasive cast skin — take a deep first cut through the scale.
Can GE240 +QT be welded?
Yes — weldability is rated very good (78/100). Readily weldable by SMAW/GMAW/SAW with low-hydrogen consumables (E7018 class); preheat 100–150 °C for sections over ~30 mm and stress-relieve at 580–620 °C after major repair welds.
What surface finishes work on GE240 +QT?
No inherent corrosion resistance: shot-blast then prime/paint, zinc-spray, hot-dip galvanize or phosphate; can be flame or induction surface hardened only marginally due to low carbon.
Can GE240 +QT be formed, bent or molded?
Sand or investment cast with generous feeders and chills — steel shrinks ~2 % and needs strong risering; normalize after casting for uniform properties.
What is the maximum service temperature of GE240 +QT?
GE240 +QT 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 GE240 +N and GE240-F?
+N is the default condition — standard supply condition: normalizing refines the as-cast dendritic structure and gives the specified 240 MPa yield with good toughness. F: economy option for low-stress, non-impact parts where only stress relief is applied; properties are less uniform than +N. Yield strength is 265 MPa in +N versus 245 MPa in F.
Sources
- EN 10293 — Steel castings for general engineering uses — CEN (2015)
- DIN 1681 — Cast steels for general engineering (GS-45, superseded) — DIN (1985)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels and High-Performance Alloys (Cast Carbon Steels) — ASM International (1990)
- GB/T 11352 — (ZG230-450 comparison) — SAC (2009)
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.