Steel 86B30-HR (Hot rolled)
Supply condition
EN 86B30 · UNS G86301
Cheapest supply form for parts that will be forged and heat treated afterwards.
Values for the HR condition
Other 86B30 tempers and conditions
86B30 is listed in 10 conditions; see the grade overview at 86B30.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Pick for maximum machinability and cold-forming before final quench and temper. | 375 | 565 | 29 | 156 HB | — |
Normalized | Use to homogenize forgings and give uniform medium strength before machining or final Q&T. | 430 | 650 | 23 | 187 HB | — |
HRThis page Hot rolled | Cheapest supply form for parts that will be forged and heat treated afterwards. | 450 | 690 | 22 | 13 HRC | 8.1 % IACS |
Cold drawn | Choose for close-tolerance bright bar with raised yield strength and good surface finish. | 590 | 700 | 15 | 17 HRC | 8 % IACS |
Q&T 650 °C | Soft, tough condition for impact-loaded or low-temperature service parts and easier machining. | 690 | 775 | 23 | 22 HRC | — |
QT540Default Q&T 540 °C | Standard commercial quenched and tempered condition, tempered at 540 °C to ~30-32 HRC and 880 MPa yield, for the best strength/toughness compromise in structural and automotive parts. | 880 | 970 | 17 | 32 HRC | — |
Induction Hardened & Tempered | Select when a wear-resistant surface with a tough Q&T core is needed on shafts, pins and splines. | 880 | 970 | 12 | 53 HRC | 7.5 % IACS |
Q&T 425 °C | Balance of strength and moderate ductility for shafts and gear blanks. | 1,100 | 1,170 | 13 | 40 HRC | — |
Q&T 315 °C | High-strength condition for wear-loaded links, pins and forged fittings. | 1,240 | 1,380 | 10 | 44 HRC | — |
Q&T 205 °C | Highest strength/hardness condition; use only where toughness demand is low. | 1,360 | 1,550 | 9 | 48 HRC | — |
What is 86B30-HR?
86B30-HR is 86B30 supplied in the HR condition — cheapest supply form for parts that will be forged and heat treated afterwards. 86B30-HR has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 52% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi). 86B30-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). QT540 is the default condition FabDigit quotes; HR is available on request or by drawing note.
Advantages
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
86B30-HR properties
Typical room-temperature values for 86B30-HR; 23 are specific to this condition. Other listed values are 86B30 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
86B30-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
86B30-HR has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 52% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
86B30-HR is rated for continuous service to 400°C (752 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), better than 66% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
86B30-HR conducts electricity at 8.1 % IACS, better than 61% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (11/100), worse than 73% of steel grades.
Sustainability4
Producing a kilogram of 86B30-HR takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
86B30-HR's machinability is good (55/100, better than 62% of steel grades); weldability fair (50/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 86B30-HR
Is 86B30 easy to machine?
Machine in the annealed or normalized state (≈65–70 % of 1212); in Q&T at 30+ HRC use rigid setups, coated carbide, low feed rates and flood coolant.
Can 86B30 be welded?
Carbon equivalent ~0.6–0.7: preheat 200–300 °C, use low-hydrogen consumables and PWHT/temper after welding to avoid cold cracking; the weld HAZ loses boron's hardenability benefit unevenly.
Can 86B30 be formed, bent or molded?
Hot forge 1100–1200 °C with finish above 950 °C; cold forming only in the spheroidized-annealed condition, followed by quench and temper (oil quench from ~860 °C).
What surface finishes work on 86B30?
No inherent corrosion resistance — specify phosphate + oil, zinc plating (with bake-out for hydrogen embrittlement above ~1000 MPa), black oxide or painting; polishes well after hardening.
86B30 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 |
|---|---|---|
| C | 0.28 – 0.33 | 0.3 |
| Mn | 0.7 – 0.9 | 0.8 |
| 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; effective (soluble) boron requires N-fixing with Ti/Al | 5×10⁻⁴ – 0 | 0 |
| P | ≤ 0.04 | — |
| S | ≤ 0.04 | — |
| Fe | balance | — |
86B30-HR — frequently asked
What is 86B30-HR used for?
86B30-HR is typically used for structural components, automotive parts and fasteners. In short: boron version of 8630; same hardenability, less alloy; quench-and-temper structural grade.
What is the yield strength of 86B30-HR?
86B30-HR has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 52% of steel grades. Strength varies by condition: see the 10 listed tempers.
Is 86B30-HR easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machine in the annealed or normalized state (≈65–70 % of 1212); in Q&T at 30+ HRC use rigid setups, coated carbide, low feed rates and flood coolant.
Can 86B30-HR be welded?
With care — weldability is rated fair (50/100). Carbon equivalent ~0.6–0.7: preheat 200–300 °C, use low-hydrogen consumables and PWHT/temper after welding to avoid cold cracking; the weld HAZ loses boron's hardenability benefit unevenly.
What surface finishes work on 86B30-HR?
No inherent corrosion resistance — specify phosphate + oil, zinc plating (with bake-out for hydrogen embrittlement above ~1000 MPa), black oxide or painting; polishes well after hardening.
Can 86B30-HR be formed, bent or molded?
Hot forge 1100–1200 °C with finish above 950 °C; cold forming only in the spheroidized-annealed condition, followed by quench and temper (oil quench from ~860 °C).
What is the maximum service temperature of 86B30-HR?
86B30-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 86B30-QT540 and 86B30-A?
QT540 is the default condition — standard commercial quenched and tempered condition, tempered at 540 °C to ~30-32 HRC and 880 MPa yield, for the best strength/toughness compromise in structural and automotive parts. A: pick for maximum machinability and cold-forming before final quench and temper. Yield strength is 880 MPa in QT540 versus 375 MPa in A.
Sources
- SAE J404 — Chemical Compositions of SAE Alloy Steels — SAE International (2021)
- SAE J1268 — Hardenability Bands for Boron H-Steels — SAE International (2018)
- 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.4 — Heat Treating — ASM International (1991)
- 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.