Steel E275 +SR (Stress relieved)
Heat-treated state
EN E275
Pick when cold-drawn strength and close tolerance must be kept but residual stress and distortion during machining must be reduced.
Values for the +SR condition
Other E275 tempers and conditions
E275 is listed in 6 conditions; see the grade overview at E275.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose when maximum ductility is needed for tube bending, flaring, expanding or subsequent deep cold forming. | 255 | 420 | 32 | 120 HB | — |
Hot rolled | Cheapest supply condition for hot-finished tube and bar where only nominal strength is required and no forming or precision tolerance is needed. | 300 | 490 | 23 | 145 HB | — |
+NDefault Normalized | Default stocked condition: uniform fine-grained structure with guaranteed ReH ≥ 275 MPa, good toughness and reliable weldability for pressure and mechanical tube. | 310 | 480 | 26 | 140 HB | — |
Lightly cold drawn | Use where precision-tube tolerances and a bright surface are needed but the part must still be bent or flared. | 400 | 520 | 16 | 160 HB | — |
+SRThis page Stress relieved | Pick when cold-drawn strength and close tolerance must be kept but residual stress and distortion during machining must be reduced. | 450 | 560 | 12 | 170 HB | — |
Cold drawn | Highest strength and hardness with the tightest tolerances and best surface — for hydraulic cylinder, shaft and roller tube that will not be bent. | 550 | 640 | 6 | 195 HB | — |
What is E275 +SR?
E275 +SR is E275 heat treated to +SR — pick when cold-drawn strength and close tolerance must be kept but residual stress and distortion during machining must be reduced. E275 +SR has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 52% of steel grades. Elongation at break is 12% and the elastic modulus is 210 GPa (30.5 Msi). E275 +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 — 68/100, better than 95% of steel grades
- High electrical conductivity — 10.8 % IACS, better than 94% of steel grades
- Conducts heat well — 50 W/m·K (28.9 BTU/hr·ft·°F), better than 87% of steel grades
- Readily welded — 88/100, better than 87% of steel grades
Limitations
- Limited ductility — 12%, worse than 84% of steel grades
E275 +SR properties
Typical room-temperature values for E275 +SR; 14 are specific to this condition. Other listed values are E275 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
E275 +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
E275 +SR has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 52% of steel grades. Elongation at break is 12% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
E275 +SR is rated for continuous service to 350°C (662 °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
E275 +SR conducts electricity at 10.8 % IACS, better than 94% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of E275 +SR takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
E275 +SR's machinability is good (68/100, better than 95% of steel grades); weldability excellent (88/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E275 +SR
Is E275 easy to machine?
Machines easily but chips are gummy in +A/+N — use sharp positive-rake carbide, generous feed and coolant; cold-drawn +C/+SR gives the cleanest chip breaking and best surface.
Can E275 be welded?
Excellent weldability by MAG, TIG, resistance and laser with ER70S-type filler; CEV ≤ ~0.40 so preheat only for heavy walls or low ambient temperature.
Can E275 be formed, bent or molded?
Bend, flare and expand in +A or +N; +C tube work-hardens and cracks in tight bends, so specify +SR/+LC when forming after drawing.
What surface finishes work on E275?
No anodizing — protect by zinc electroplating, hot-dip galvanizing, phosphate + oil, or e-coat/paint; hard chrome plating is standard for cylinder-tube bores.
E275 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 |
|---|---|---|
| Ccast analysis, EN 10305-2 / EN 10297-1 | ≤ 0.22 | 0.18 |
| Si | ≤ 0.35 | 0.2 |
| Mn | ≤ 1.5 | 1 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.02 |
| Febalance, residuals (Cr, Ni, Cu, Mo) not specified | balance | — |
E275 +SR — frequently asked
What is E275 +SR used for?
E275 +SR is typically used for precision steel tubing, hydraulic cylinder tubes, machine components and engineering tube stock. In short: cold-drawn cylinder tube grade; weldability score 90; service to 350 °C.
What is the yield strength of E275 +SR?
E275 +SR has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 52% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is E275 +SR easy to machine?
Reasonably — machinability is rated good (68/100, better than 95% of steel grades). Machines easily but chips are gummy in +A/+N — use sharp positive-rake carbide, generous feed and coolant; cold-drawn +C/+SR gives the cleanest chip breaking and best surface.
Can E275 +SR be welded?
Yes — weldability is rated excellent (88/100). Excellent weldability by MAG, TIG, resistance and laser with ER70S-type filler; CEV ≤ ~0.40 so preheat only for heavy walls or low ambient temperature.
What surface finishes work on E275 +SR?
No anodizing — protect by zinc electroplating, hot-dip galvanizing, phosphate + oil, or e-coat/paint; hard chrome plating is standard for cylinder-tube bores.
Can E275 +SR be formed, bent or molded?
Bend, flare and expand in +A or +N; +C tube work-hardens and cracks in tight bends, so specify +SR/+LC when forming after drawing.
What is the maximum service temperature of E275 +SR?
E275 +SR 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.
Sources
- EN 10305-1/-2 Steel tubes for precision applications — technical delivery conditions — CEN (2016)
- EN 10297-1 Seamless circular steel tubes for mechanical and general engineering purposes — CEN (2003)
- EN 10027-2 Designation systems for steels — numerical system (1.0225) — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Machinery's Handbook, 31st ed. — Industrial Press (2020)
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.