Steel E315 +AR (Hot rolled)
Heat-treated state
EN E315
Lowest-cost option for non-critical structural tube where only nominal mechanical properties are needed.
Values for the +AR condition
Other E315 tempers and conditions
E315 is listed in 6 conditions; see the grade overview at E315.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose for maximum cold formability — deep bending, flaring, expanding or subsequent forming operations. | 290 | 460 | 28 | 135 HB | 10 % IACS |
+ARThis page Hot rolled | Lowest-cost option for non-critical structural tube where only nominal mechanical properties are needed. | 330 | 510 | 22 | 150 HB | 10 % IACS |
+NDefault Normalized | Default delivery condition when the specified ReH ≥ 315 MPa with good ductility and toughness is required. | 350 | 520 | 24 | 155 HB | — |
Lightly cold worked after final heat treatment | Use when tight dimensional tolerance is needed but the tube must still bend, flare or expand. | 400 | 550 | 14 | 170 HB | 10 % IACS |
Stress relieved | Compromise condition: keeps most of the cold-work strength while removing residual stress for dimensional stability after machining. | 440 | 550 | 13 | 175 HB | 10 % IACS |
Cold drawn | Pick for maximum strength, close tolerances and good surface on precision tube where low elongation and residual stress are acceptable. | 520 | 620 | 8 | 190 HB | — |
What is E315 +AR?
E315 +AR is E315 heat treated to +AR — lowest-cost option for non-critical structural tube where only nominal mechanical properties are needed. E315 +AR has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 78% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi). E315 +AR 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; +AR is available on request or by drawing note.
Advantages
- 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
- High electrical conductivity — 10 % IACS, better than 83% of steel grades
- Forms and bends easily — 66/100, better than 83% of steel grades
Limitations
- Low strength — 330 MPa (47.9 ksi), worse than 78% of steel grades
E315 +AR properties
Typical room-temperature values for E315 +AR; 22 are specific to this condition. Other listed values are E315 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
E315 +AR 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
E315 +AR has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 78% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
E315 +AR 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 12.2 µm/m·K (6.78 µin/in·°F).
Electrical3
E315 +AR 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 E315 +AR takes about 25 MJ of energy and emits 2.1 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability8
E315 +AR's machinability is good (60/100, better than 83% of steel grades); weldability excellent (88/100); formability good (66/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with E315 +AR
Is E315 easy to machine?
Machines like 1020/1025 — use sharp HSS or coated carbide, moderate speeds and good chip control; gummy in the +A condition, best surface finish in +C or +SR.
Can E315 be welded?
Excellent weldability by MAG, TIG, resistance and laser with low CEV; no preheat needed on thin walls, use low-hydrogen consumables and consider stress relief after heavy welding of +C tube.
Can E315 be formed, bent or molded?
Cold bend, flare, expand and roll-form readily in +A or +N; in +C reduce bend radius expectations and allow for high springback and residual stress.
What surface finishes work on E315?
Not anodizable — protect by zinc plating/galvanizing, phosphating plus oil, e-coat or paint; can be hard-chrome plated or honed for hydraulic cylinder tube.
E315 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 |
|---|---|---|
| Cladle analysis, non-alloy quality steel | ≤ 0.2 | 0.17 |
| Si | ≤ 0.35 | 0.25 |
| Mnmain strengthening addition for the 315 MPa yield class | ≤ 1.4 | 1.1 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.02 |
| Nunless Al-fixed nitrogen | ≤ 0.01 | 0.01 |
| Febalance, plus residual Cu/Cr/Ni | balance | — |
E315 +AR — frequently asked
What is E315 +AR used for?
E315 +AR is typically used for precision steel tubing, high-strength hydraulic tubes, chassis and frame tubing and machine parts. In short: strongest E-series tube grade; weldable at 350 MPa yield; suits hydraulic tube duty.
What is the yield strength of E315 +AR?
E315 +AR has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 78% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is E315 +AR easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like 1020/1025 — use sharp HSS or coated carbide, moderate speeds and good chip control; gummy in the +A condition, best surface finish in +C or +SR.
Can E315 +AR be welded?
Yes — weldability is rated excellent (88/100). Excellent weldability by MAG, TIG, resistance and laser with low CEV; no preheat needed on thin walls, use low-hydrogen consumables and consider stress relief after heavy welding of +C tube.
What surface finishes work on E315 +AR?
Not anodizable — protect by zinc plating/galvanizing, phosphating plus oil, e-coat or paint; can be hard-chrome plated or honed for hydraulic cylinder tube.
Can E315 +AR be formed, bent or molded?
Cold bend, flare, expand and roll-form readily in +A or +N; in +C reduce bend radius expectations and allow for high springback and residual stress.
What is the maximum service temperature of E315 +AR?
E315 +AR 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/-3 Steel tubes for precision applications — CEN (2016)
- EN 10297-1 Seamless circular steel tubes for mechanical and general engineering purposes — CEN (2003)
- EN 10296-1 Welded circular steel tubes for mechanical and general engineering purposes — CEN (2003)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- EN ISO 18265 Metallic materials — Conversion of hardness values — CEN/ISO (2013)
- worldsteel LCI data for steel products — World Steel Association (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.