Steel GP240GH +QT (Quenched and tempered)
Heat-treated state
ASTM A216 Grade WCB · EN 1.0619
Choose when higher yield strength and better low-temperature/section toughness are needed in thicker castings.
Values for the +QT condition
Other GP240GH tempers and conditions
GP240GH is listed in 4 conditions; see the grade overview at GP240GH.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Normalized | Basic pressure-casting condition when only RT impact and standard strength are required. | 260 | 485 | 24 | 145 HB | 10 % IACS |
Stress relieved | Applied after weld repair or heavy machining of +N/+NT castings to relieve residual stress with negligible strength change. | 260 | 480 | 26 | 140 HB | 10 % IACS |
+NTDefault Normalized and tempered | Standard stocked condition for valve bodies and pressure castings — best balance of strength, ductility and toughness with low residual stress. | 270 | 490 | 25 | 145 HB | — |
+QTThis page Quenched and tempered | Choose when higher yield strength and better low-temperature/section toughness are needed in thicker castings. | 320 | 540 | 23 | 170 HB | — |
What is GP240GH +QT?
GP240GH +QT is GP240GH heat treated to +QT — choose when higher yield strength and better low-temperature/section toughness are needed in thicker castings. GP240GH +QT has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 81% of steel grades. Elongation at break is 23% and the elastic modulus is 210 GPa (30.5 Msi). GP240GH +QT 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). +NT is the default condition FabDigit quotes; +QT is available on request or by drawing note.
Advantages
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- Conducts heat well — 50 W/m·K (28.9 BTU/hr·ft·°F), better than 87% of steel grades
- High electrical conductivity — 10 % IACS, better than 83% of steel grades
- Readily welded — 80/100, better than 79% of steel grades
Limitations
- Low strength — 320 MPa (46.4 ksi), worse than 81% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
GP240GH +QT properties
Typical room-temperature values for GP240GH +QT; 14 are specific to this condition. Other listed values are GP240GH reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
GP240GH +QT 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
GP240GH +QT has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 81% of steel grades. Elongation at break is 23% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
GP240GH +QT is rated for continuous service to 425°C (797 °F). It conducts heat at 50 W/m·K (28.9 BTU/hr·ft·°F), better than 87% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
GP240GH +QT conducts electricity at 10 % IACS, better than 83% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of GP240GH +QT takes about 24 MJ of energy and emits 1.9 kg of CO₂ — less than 97% of steel grades. Typical recycled content is 75%.
Manufacturability8
GP240GH +QT's machinability is good (60/100, better than 83% of steel grades); weldability very good (80/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with GP240GH +QT
Is GP240GH easy to machine?
Machines like ~0.2 %C steel at 70 % of AISI 1212; watch for hard skin, sand inclusions and shrinkage porosity — use rigid setups and carbide tooling with generous DOC.
Can GP240GH be welded?
Readily weldable by SMAW/GMAW/SAW with E7018-class or ER70S consumables; preheat 100–150 °C for heavy sections and stress-relieve at 600–650 °C after major repair welds.
Can GP240GH be formed, bent or molded?
Produced as sand or investment castings; good fluidity for a steel but requires generous risers, chills and a full normalize to break up as-cast dendritic structure.
What surface finishes work on GP240GH?
No inherent corrosion resistance — shot-blast then paint, zinc-rich primer, phosphate or electroless nickel; anodizing is not applicable.
GP240GH 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 10213 max | ≤ 0.25 | 0.2 |
| Si | ≤ 0.6 | 0.4 |
| Mn | ≤ 1.2 | 0.9 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Crresidual element | ≤ 0.3 | 0.1 |
| Niresidual element | ≤ 0.4 | 0.15 |
| Moresidual element | ≤ 0.12 | 0.04 |
| Curesidual element | ≤ 0.3 | 0.1 |
| Vresidual element | ≤ 0.03 | 0.01 |
| Cr+Ni+Mo+Cu+V totalsum of residuals per EN 10213 | ≤ 1 | — |
| Fe | balance | — |
GP240GH +QT — frequently asked
What is GP240GH +QT used for?
GP240GH +QT is typically used for valve bodies, pressure vessel castings and pump casings for elevated temperature service. In short: EN equivalent of A216 WCB; most weldable cast carbon steel; standard pressure-casting workhorse.
What is the yield strength of GP240GH +QT?
GP240GH +QT has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 81% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is GP240GH +QT easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like ~0.2 %C steel at 70 % of AISI 1212; watch for hard skin, sand inclusions and shrinkage porosity — use rigid setups and carbide tooling with generous DOC.
Can GP240GH +QT be welded?
Yes — weldability is rated very good (80/100). Readily weldable by SMAW/GMAW/SAW with E7018-class or ER70S consumables; preheat 100–150 °C for heavy sections and stress-relieve at 600–650 °C after major repair welds.
What surface finishes work on GP240GH +QT?
No inherent corrosion resistance — shot-blast then paint, zinc-rich primer, phosphate or electroless nickel; anodizing is not applicable.
Can GP240GH +QT be formed, bent or molded?
Produced as sand or investment castings; good fluidity for a steel but requires generous risers, chills and a full normalize to break up as-cast dendritic structure.
What is the maximum service temperature of GP240GH +QT?
GP240GH +QT is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- ASTM A216/A216M — Carbon steel castings for high-temperature service (Grade WCB) — ASTM (2018)
- EN 10027 / Stahl-Eisen-Werkstoffblatt 310 — physical properties of steels — VDEh (1992)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.15 — Casting — ASM International (2008)
- Cast steel GP240GH (1.0619) valve-body datasheets — European/Chinese steel foundries (2023)
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.