Steel GS240 +SR (Stress relieved)
Heat-treated state
EN 1.0455
Applied after weld repair or heavy rough machining to stabilize dimensions without changing the normalized properties much.
Values for the +SR condition
Other GS240 tempers and conditions
GS240 is listed in 6 conditions; see the grade overview at GS240.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose when maximum softness, dimensional stability and easiest machining of complex castings is wanted before final treatment. | 235 | 440 | 26 | 130 HB | — |
As fabricated | Cheapest condition for lightly loaded, non-critical parts where residual stress and coarse as-cast structure are acceptable. | 240 | 460 | 18 | 150 HB | — |
+SRThis page Stress relieved | Applied after weld repair or heavy rough machining to stabilize dimensions without changing the normalized properties much. | 255 | 470 | 24 | 145 HB | 10 % IACS |
Normalized and tempered | Pick when residual stresses must be removed and toughness maximized in heavier, welded or machined-all-over castings. | 260 | 470 | 25 | 145 HB | — |
+NDefault Normalized | Standard delivery condition: refines the as-cast grain, gives the specified 240 MPa proof strength with good toughness and weldability. | 265 | 480 | 23 | 150 HB | — |
Quenched and tempered | Use for the highest strength and low-temperature toughness attainable from this low-carbon composition, in thinner or hardenable sections. | 380 | 570 | 20 | 185 HB | — |
What is GS240 +SR?
GS240 +SR is GS240 heat treated to +SR — applied after weld repair or heavy rough machining to stabilize dimensions without changing the normalized properties much. GS240 +SR has a yield strength of 255 MPa (37 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 93% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi). GS240 +SR 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). +N is the default condition FabDigit quotes; +SR is available on request or by drawing note.
Advantages
- Easy to machine — 63/100, better than 92% of steel grades
- 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 — 85/100, better than 83% of steel grades
Limitations
- Low strength — 255 MPa (37 ksi), worse than 93% of steel grades
GS240 +SR properties
Typical room-temperature values for GS240 +SR; 22 are specific to this condition. Other listed values are GS240 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
GS240 +SR 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
GS240 +SR has a yield strength of 255 MPa (37 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 93% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
GS240 +SR is rated for continuous service to 400°C (752 °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
GS240 +SR 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 GS240 +SR takes about 24 MJ of energy and emits 1.9 kg of CO₂ — less than 97% of steel grades. Typical recycled content is 85%.
Manufacturability8
GS240 +SR's machinability is good (63/100, better than 92% of steel grades); weldability excellent (85/100); formability poor (26/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with GS240 +SR
Is GS240 easy to machine?
Machines like a normalized 1020–1025 steel at roughly 65 % of AISI 1212; use coated carbide, 120–200 m/min turning, and take a first cut deep enough to get under any casting skin, sand inclusions or chill.
Can GS240 be welded?
Very good weldability (C ≈ 0.20 %, CEV ≈ 0.40) with E7018/ER70S-6 consumables; preheat 100–150 °C for sections over ~30 mm and stress-relieve at 550–620 °C after major weld repair.
Can GS240 be formed, bent or molded?
Green-sand, furan no-bake or shell moulding with generous risering (steel shrinkage ≈ 2 %); pour ~1560–1600 °C, fully deoxidize with Al, and normalize after knock-out to break up the coarse as-cast structure.
What surface finishes work on GS240?
Shot-blast to SA 2.5, then phosphate + primer, epoxy or zinc-rich paint; hot-dip galvanizing and zinc/nickel plating are also routine — anodizing does not apply.
GS240 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 |
|---|---|---|
| Cunalloyed cast steel; CEV typically ≤ 0.45 | ≤ 0.23 | 0.2 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 0.5 – 1.2 | 0.9 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.02 |
| Crresidual | ≤ 0.3 | 0.1 |
| Niresidual | ≤ 0.4 | 0.15 |
| Moresidual | ≤ 0.12 | 0.03 |
| Curesidual | ≤ 0.3 | 0.15 |
| Vresidual | ≤ 0.03 | 0.01 |
| Febalance; total residuals typically ≤ 1.0 % | balance | — |
GS240 +SR — frequently asked
What is GS240 +SR used for?
GS240 +SR is typically used for valve bodies, pump housings and general machinery castings. In short: weldable workhorse casting; medium strength, good ductility; low CEV for repair welding.
What is the yield strength of GS240 +SR?
GS240 +SR has a typical yield strength of 255 MPa (37 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 93% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is GS240 +SR easy to machine?
Reasonably — machinability is rated good (63/100, better than 92% of steel grades). Machines like a normalized 1020–1025 steel at roughly 65 % of AISI 1212; use coated carbide, 120–200 m/min turning, and take a first cut deep enough to get under any casting skin, sand inclusions or chill.
Can GS240 +SR be welded?
Yes — weldability is rated excellent (85/100). Very good weldability (C ≈ 0.20 %, CEV ≈ 0.40) with E7018/ER70S-6 consumables; preheat 100–150 °C for sections over ~30 mm and stress-relieve at 550–620 °C after major weld repair.
What surface finishes work on GS240 +SR?
Shot-blast to SA 2.5, then phosphate + primer, epoxy or zinc-rich paint; hot-dip galvanizing and zinc/nickel plating are also routine — anodizing does not apply.
Can GS240 +SR be formed, bent or molded?
Green-sand, furan no-bake or shell moulding with generous risering (steel shrinkage ≈ 2 %); pour ~1560–1600 °C, fully deoxidize with Al, and normalize after knock-out to break up the coarse as-cast structure.
What is the maximum service temperature of GS240 +SR?
GS240 +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 GS240 +N and GS240-F?
+N is the default condition — standard delivery condition: refines the as-cast grain, gives the specified 240 MPa proof strength with good toughness and weldability. F: cheapest condition for lightly loaded, non-critical parts where residual stress and coarse as-cast structure are acceptable. Yield strength is 265 MPa in +N versus 240 MPa in F.
Sources
- EN 10293 — Steel castings for general engineering uses — CEN (2015)
- DIN 1681 / DIN 17182 — Cast carbon steels for general purposes — DIN (1985)
- ASTM A216/A216M — Carbon Steel Castings for High-Temperature Service (WCB) — ASTM (2021)
- GB/T 11352 — (ZG230-450, ZG270-500) — SAC (2009)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- Stahlschlüssel / Key to Steel — material no. 1.0455 — Verlag Stahlschlüssel Wegst (2019)
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.