Steel E730K2
EN 1.8893
Very high-strength quality structural steel with minimum yield strength of 730 MPa and impact toughness at -20°C, intended for heavily loaded machine and structural components requiring high strength-to-weight ratio.
Reference datasheet — E730K2 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the +QT condition
E730K2 tempers and conditions
E730K2 is supplied in 3 conditions, soft to hard. +QT is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose when heavy machining or cold forming precedes a final quench-and-temper by the part maker. | 400 | 620 | 22 | 11 HRC | 8 % IACS |
Normalized | Used only as an intermediate grain-refining state before final quench and temper; strength stays well below the grade minimum. | 470 | 700 | 19 | 16 HRC | 7.5 % IACS |
+QTDefault Quenched and tempered | Standard supply condition; the only state that meets the 730 MPa yield and -20 °C impact requirements. | 780 | 870 | 14 | 27 HRC | — |
What is E730K2?
Very high-strength quality structural steel with minimum yield strength of 730 MPa and impact toughness at -20°C, intended for heavily loaded machine and structural components requiring high strength-to-weight ratio. E730K2 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F). E730K2 has a yield strength of 780 MPa (113 ksi) and a tensile strength of 870 MPa (126 ksi) — stronger than 86% of steel grades. Elongation at break is 14% and the elastic modulus is 210 GPa (30.5 Msi).
What is E730K2 used for?
- heavy machinery components
- high-strength structural parts
- load-bearing shafts
- mobile equipment structures
Advantages
- High strength — 780 MPa (113 ksi), better than 86% of steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 78% of steel grades
- Limited ductility — 14%, worse than 75% of steel grades
E730K2 properties
Typical room-temperature values for E730K2-+QT; bars are the position among steel grades.
Physical3
E730K2 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
E730K2 has a yield strength of 780 MPa (113 ksi) and a tensile strength of 870 MPa (126 ksi) — stronger than 86% of steel grades. Elongation at break is 14% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
E730K2 is rated for continuous service to 300°C (572 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 64% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
E730K2 conducts electricity at 7.5 % IACS, worse than 67% of steel grades.
Chemical & Environmental2
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of E730K2 takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 30%.
Manufacturability7
E730K2's machinability is fair (45/100, worse than 65% of steel grades); weldability good (55/100); formability fair (35/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. E730K2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E730K2
Is E730K2 easy to machine?
Machine in +A condition where possible; in +QT use rigid setups, coated carbide, moderate speed and generous feed to stay below the work-hardened skin.
Can E730K2 be welded?
Weldable with low-hydrogen consumables and controlled heat input; preheat 100–150 °C (thicker/higher CEV sections more) and avoid slow cooling that softens the HAZ.
Can E730K2 be formed, bent or molded?
Cold bending needs generous inner radii (typically ≥3–4 t across the rolling direction) and deburred, crack-free edges; hot forming above the tempering temperature requires re-quenching and tempering.
E730K2 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 |
|---|---|---|
| Cindicative for EN quenched-and-tempered high-strength engineering steels; confirm on mill certificate | ≤ 0.22 | 0.18 |
| Si | ≤ 0.6 | 0.3 |
| Mn | 0.8 – 1.7 | 1.3 |
| P | ≤ 0.03 | |
| S | ≤ 0.02 | |
| Crhardenability addition, producer-dependent | ≤ 1.5 | 0.6 |
| Nifor low-temperature toughness | ≤ 2 | 0.6 |
| Mo | ≤ 0.7 | 0.3 |
| Vmicroalloying | ≤ 0.12 | 0.05 |
| Ti | ≤ 0.05 | |
| Nb | ≤ 0.06 | |
| Bboron-treated for hardenability in thin sections | ≤ 0.01 | 0 |
| Cu | ≤ 0.5 | |
| Altotal Al for fine grain / N binding | ≥ 0.02 | 0.03 |
| Fe | balance |
What surface finishes work on E730K2?
No anodizing; protect by shot-blast plus epoxy/zinc-rich paint, hot-dip galvanizing (watch for liquid-metal-assisted cracking in highly stressed parts) or zinc-nickel plating with post-bake to avoid hydrogen embrittlement.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel E730K2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.8893
How much does E730K2 cost?
E730K2 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
E730K2 — frequently asked
What is E730K2 used for?
E730K2 is typically used for heavy machinery components, high-strength structural parts, load-bearing shafts and mobile equipment structures. In short: highest-strength E-series grade; toughness at -20 °C; limited formability.
What is the yield strength of E730K2?
E730K2 has a typical yield strength of 780 MPa (113 ksi) and a tensile strength of 870 MPa (126 ksi) — stronger than 86% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is E730K2 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine in +A condition where possible; in +QT use rigid setups, coated carbide, moderate speed and generous feed to stay below the work-hardened skin.
Can E730K2 be welded?
Yes — weldability is rated good (55/100). Weldable with low-hydrogen consumables and controlled heat input; preheat 100–150 °C (thicker/higher CEV sections more) and avoid slow cooling that softens the HAZ.
What surface finishes work on E730K2?
No anodizing; protect by shot-blast plus epoxy/zinc-rich paint, hot-dip galvanizing (watch for liquid-metal-assisted cracking in highly stressed parts) or zinc-nickel plating with post-bake to avoid hydrogen embrittlement.
Can E730K2 be formed, bent or molded?
Cold bending needs generous inner radii (typically ≥3–4 t across the rolling direction) and deburred, crack-free edges; hot forming above the tempering temperature requires re-quenching and tempering.
What is the maximum service temperature of E730K2?
E730K2 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does E730K2 cost?
E730K2 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 10027-1 Designation systems for steels — Part 1: Steel names — CEN (2016)
- EN 10027-2 Designation systems for steels — Part 2: Numerical system — CEN (2015)
- EN 10083-3 Steels for quenching and tempering — Alloy steels — CEN (2006)
- EN 10025-6 Hot rolled products — Flat products of high yield strength structural steels in the quenched and tempered condition — CEN (2019)
- ASM Handbook Vol. 1: Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.