Steel 86B45-HR (Hot rolled)
Supply condition
EN 86B45 · UNS G86451
Cheapest mill condition for stock bar that will be machined then heat treated by the user.
Values for the HR condition
Other 86B45 tempers and conditions
86B45 is listed in 10 conditions; see the grade overview at 86B45.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize Annealed | Use for cold-headed fasteners and cold-extruded blanks where maximum ductility of the carbide structure is needed. | 390 | 620 | 26 | 9 HRC | 8.3 % IACS |
Solution annealed | Pick for maximum machinability and softness before quench-and-temper or cold forming. | 415 | 655 | 22 | 190 HB | 44 W/m·K |
HRThis page Hot rolled | Cheapest mill condition for stock bar that will be machined then heat treated by the user. | 470 | 760 | 18 | 217 HB | — |
Normalized | Grain refinement and uniform structure ahead of machining or hardening; moderate strength forgings. | 550 | 830 | 17 | 23 HRC | — |
Cold drawn | Choose for tight-tolerance, good-surface bar used as-supplied for shafts and screw-machine parts. | 680 | 790 | 12 | 235 HB | — |
Q&T 28–32 HRC | Tough general-purpose condition for shafts, couplings and machined parts needing good impact resistance. | 840 | 965 | 18 | 30 HRC | — |
QT32-36Default Q&T 32–36 HRC | Standard stocked strength/toughness balance for gear blanks, drive shafts and high-strength fasteners. | 950 | 1,080 | 16 | 34 HRC | — |
Induction hardened | Choose for journal, spline and gear-tooth wear surfaces needing a hard case with a tough tempered core. | 950 | 1,080 | 14 | 57 HRC | 7.3 % IACS |
Q&T 38–42 HRC | Higher-strength condition for heavily loaded shafts, pins and links where some toughness can be traded for strength. | 1,180 | 1,310 | 13 | 40 HRC | — |
Q&T 44–48 HRC | Maximum through-hardened strength/wear condition; use only where notch sensitivity and hydrogen embrittlement are controlled. | 1,400 | 1,550 | 10 | 46 HRC | — |
What is 86B45-HR?
86B45-HR is 86B45 supplied in the HR condition — cheapest mill condition for stock bar that will be machined then heat treated by the user. 86B45-HR has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 57% of steel grades. Elongation at break is 18% and the elastic modulus is 205 GPa (29.7 Msi). 86B45-HR 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). QT32-36 is the default condition FabDigit quotes; HR is available on request or by drawing note.
86B45-HR properties
Typical room-temperature values for 86B45-HR; 11 are specific to this condition. Other listed values are 86B45 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
86B45-HR 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
86B45-HR has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 57% of steel grades. Elongation at break is 18% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
86B45-HR is rated for continuous service to 400°C (752 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
86B45-HR conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (11/100), worse than 73% of steel grades.
Sustainability4
Producing a kilogram of 86B45-HR takes about 28 MJ of energy and emits 2.2 kg of CO₂ — less than 56% of steel grades. Typical recycled content is 30%.
Manufacturability7
86B45-HR's machinability is fair (52/100, better than 52% of steel grades); weldability poor (28/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 86B45-HR
Is 86B45 easy to machine?
Machine in the annealed/normalized state (~190–240 HB) with coated carbide; above 34 HRC use rigid setups, negative-rake carbide or CBN and reduced feeds.
Can 86B45 be welded?
Poor weldability (CE ≈ 0.8–0.9): preheat 250–350 °C, low-hydrogen consumables, and temper immediately after welding to avoid HAZ cracking.
Can 86B45 be formed, bent or molded?
Cold head or form only in the spheroidize-annealed condition; hot forge at 1050–1200 °C and normalize afterwards to restore grain size.
What surface finishes work on 86B45?
No anodizing — protect with zinc/manganese phosphate, black oxide, zinc or Cr plating; bake 190–220 °C for 4 h after plating when above 40 HRC.
86B45 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 |
|---|---|---|
| CSAE 86B45 heat analysis | 0.43 – 0.48 | 0.46 |
| Mn | 0.75 – 1 | 0.88 |
| Si | 0.15 – 0.35 | 0.25 |
| Ni | 0.4 – 0.7 | 0.55 |
| Cr | 0.4 – 0.6 | 0.5 |
| Mo | 0.15 – 0.25 | 0.2 |
| Bboron addition for hardenability; requires Ti/Al nitrogen fixation | 5×10⁻⁴ – 0 | 0 |
| P | ≤ 0.04 | — |
| S | ≤ 0.04 | — |
| Fe | balance | — |
86B45-HR — frequently asked
What is 86B45-HR used for?
86B45-HR is typically used for gears, shafts and high-strength bolts. In short: alloy-grade hardenability, less nickel; high-strength shaft and gear steel; poor weldability, coat for corrosion.
What is the yield strength of 86B45-HR?
86B45-HR has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 57% of steel grades. Strength varies by condition: see the 10 listed tempers.
Is 86B45-HR easy to machine?
Reasonably — machinability is rated fair (52/100, better than 52% of steel grades). Machine in the annealed/normalized state (~190–240 HB) with coated carbide; above 34 HRC use rigid setups, negative-rake carbide or CBN and reduced feeds.
Can 86B45-HR be welded?
Not readily — weldability is rated poor (28/100). Poor weldability (CE ≈ 0.8–0.9): preheat 250–350 °C, low-hydrogen consumables, and temper immediately after welding to avoid HAZ cracking.
What surface finishes work on 86B45-HR?
No anodizing — protect with zinc/manganese phosphate, black oxide, zinc or Cr plating; bake 190–220 °C for 4 h after plating when above 40 HRC.
Can 86B45-HR be formed, bent or molded?
Cold head or form only in the spheroidize-annealed condition; hot forge at 1050–1200 °C and normalize afterwards to restore grain size.
What is the maximum service temperature of 86B45-HR?
86B45-HR 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 86B45 QT32-36 and 86B45-SA?
QT32-36 is the default condition — standard stocked strength/toughness balance for gear blanks, drive shafts and high-strength fasteners. SA: use for cold-headed fasteners and cold-extruded blanks where maximum ductility of the carbide structure is needed. Yield strength is 950 MPa in QT32-36 versus 390 MPa in SA.
Sources
- SAE J404 — Chemical Compositions of SAE Alloy Steels — SAE International (2021)
- SAE J1268 — Hardenability Bands for Carbon and Alloy H Steels (86B45H) — SAE International (2019)
- ASTM A29/A29M — Steel Bars, Carbon and Alloy, Hot-Wrought — ASTM International (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4A — Steel Heat Treating Fundamentals and Processes — ASM International (2013)
- 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.