Steel E275K2 +U (Hot rolled)
Finish state · default condition
EN 1.0456
Standard low-cost stock condition for hot-finished seamless tube and hollow bar where the mill guarantees the K2 impact value without a separate normalizing cycle.
Values for the +U condition
Other E275K2 tempers and conditions
E275K2 is listed in 5 conditions; see the grade overview at E275K2.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Lowest hardness condition for heavy cold forming, deep expanding or extensive machining before a later normalizing/hardening step. | 260 | 440 | 30 | 130 HB | — |
+UDefaultThis page Hot rolled | Standard low-cost stock condition for hot-finished seamless tube and hollow bar where the mill guarantees the K2 impact value without a separate normalizing cycle. | 305 | 500 | 24 | 150 HB | — |
Normalized | Choose when uniform fine-grain structure and reliable -20 °C notch toughness through the full wall are required, e.g. thick hollow bar, hydraulic cylinder tube or welded assemblies. | 310 | 490 | 26 | 145 HB | — |
Stress relieved | Cold-drawn accuracy with residual stresses removed — preferred when the tube or bar will be machined asymmetrically or bent after supply. | 420 | 560 | 15 | 170 HB | — |
Cold drawn | Pick for close tolerance, smooth-bore precision tube or bar where higher yield strength and dimensional accuracy matter more than ductility. | 500 | 620 | 10 | 185 HB | — |
What is E275K2 +U?
E275K2 +U is E275K2 supplied in the +U condition — standard low-cost stock condition for hot-finished seamless tube and hollow bar where the mill guarantees the K2 impact value without a separate normalizing cycle. E275K2 +U has a yield strength of 305 MPa (44.2 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 84% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi). E275K2 +U 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).
Advantages
- 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
- Forms and bends easily — 65/100, better than 81% of steel grades
Limitations
- Low strength — 305 MPa (44.2 ksi), worse than 84% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
E275K2 +U properties
Typical room-temperature values for E275K2 +U; 15 are specific to this condition. Other listed values are E275K2 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
E275K2 +U 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
E275K2 +U has a yield strength of 305 MPa (44.2 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 84% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
E275K2 +U 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
E275K2 +U 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 E275K2 +U takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
E275K2 +U's machinability is good (60/100, better than 83% of steel grades); weldability excellent (85/100); formability good (65/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E275K2 +U
Is E275K2 easy to machine?
Machines like a medium-carbon-manganese steel at ~65 % of 1212; use sharp positive-rake carbide, generous feed and coolant to avoid built-up edge in the +U/+A conditions.
Can E275K2 be welded?
Very good weldability (CEV ≈ 0.40 max) by MAG/SMAW/SAW with ER70S-6 class filler; preheat 100–150 °C only for wall >30 mm or restrained joints.
Can E275K2 be formed, bent or molded?
Cold bendable in +N/+A with radii ≥ 2–3 t; hot form 850–1050 °C followed by normalizing to restore the K2 toughness level.
What surface finishes work on E275K2?
No natural corrosion resistance — protect by phosphating plus paint, zinc plating, hot-dip galvanizing or hard chrome for cylinder bores; not anodizable.
E275K2 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 | ≤ 0.21 | 0.17 |
| Si | ≤ 0.4 | 0.25 |
| Mn | ≤ 1.5 | 1.1 |
| PK2 quality — reduced P | ≤ 0.03 | 0.02 |
| SK2 quality — reduced S | ≤ 0.03 | 0.01 |
| N | ≤ 0.01 | 0.01 |
| Altotal Al, fully killed / fine grain treatment | ≥ 0.02 | 0.03 |
| Fe | balance | — |
E275K2 +U — frequently asked
What is E275K2 +U used for?
E275K2 +U is typically used for machine parts, structural brackets, shafts and general engineering components. In short: toughness-rated engineering steel; weldable general-purpose bar; higher strength than plain mild steel.
What is the yield strength of E275K2 +U?
E275K2 +U has a typical yield strength of 305 MPa (44.2 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 84% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is E275K2 +U easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like a medium-carbon-manganese steel at ~65 % of 1212; use sharp positive-rake carbide, generous feed and coolant to avoid built-up edge in the +U/+A conditions.
Can E275K2 +U be welded?
Yes — weldability is rated excellent (85/100). Very good weldability (CEV ≈ 0.40 max) by MAG/SMAW/SAW with ER70S-6 class filler; preheat 100–150 °C only for wall >30 mm or restrained joints.
What surface finishes work on E275K2 +U?
No natural corrosion resistance — protect by phosphating plus paint, zinc plating, hot-dip galvanizing or hard chrome for cylinder bores; not anodizable.
Can E275K2 +U be formed, bent or molded?
Cold bendable in +N/+A with radii ≥ 2–3 t; hot form 850–1050 °C followed by normalizing to restore the K2 toughness level.
What is the maximum service temperature of E275K2 +U?
E275K2 +U 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 10297-1 Seamless circular steel tubes for mechanical and general engineering purposes — Non-alloy and alloy steel tubes — CEN (2003)
- EN 10294-1 Hollow bars for machining — Non-alloy and alloy steels — CEN (2005)
- EN 10027-2 Designation systems for steels — Steel numbers — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
- EN 1011-2 Welding — Recommendations for welding of metallic materials: Arc welding of ferritic steels — CEN (2001)
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.