Steel 8622H
Grade
AISI/SAE 8622 · UNS G86220
8622H = hardenability-guaranteed (H-band) bar
Order H-grade when Jominy end-quench hardenability must be inside the SAE J1268 band for consistent gear distortion and core hardness.
Values for the 8622H condition
Other 8622 tempers and conditions
8622 is listed in 8 conditions; see the grade overview at 8622.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ADefault Solution annealed | Standard stocked condition for machining gear blanks before carburizing; softest and most stable. | 390 | 550 | 30 | 163 HB | — |
8622HThis page Hardenability-guaranteed (H-band) bar | Order H-grade when Jominy end-quench hardenability must be inside the SAE J1268 band for consistent gear distortion and core hardness. | 395 | 560 | 29 | 170 HB | 7.8 % IACS |
Hot rolled | Cheapest mill condition for parts that will be fully re-heat-treated (carburized) after rough machining. | 400 | 630 | 23 | 183 HB | — |
Normalized | Use to refine grain and homogenize forgings before carburizing; better toughness uniformity than as-rolled. | 400 | 660 | 26 | 11 HRC | 7.8 % IACS |
Cold drawn | Pick for close-tolerance, bright-finish bar going straight to light machining or as-carburized small shafts. | 600 | 700 | 15 | 207 HB | — |
oil quenched and tempered (through-hardened core) | Direct-hardened condition for shafts and fasteners needing uniform mid-strength without a case. | 800 | 950 | 17 | 30 HRC | — |
oil quenched, lower tempering temperature | Higher-strength through-hardened option for small sections where toughness can be traded for load capacity. | 930 | 1,080 | 15 | 34 HRC | — |
Carburized, quenched & tempered | The intended service condition: hard wear/pitting-resistant case over a tough 30–40 HRC core for gears and pinions. | 950 | 1,250 | 11 | 60 HRC | — |
What is 8622H?
8622H is 8622 in the 8622H grade — order H-grade when Jominy end-quench hardenability must be inside the SAE J1268 band for consistent gear distortion and core hardness. 8622H has a yield strength of 395 MPa (57.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 63% of steel grades. Elongation at break is 29% and the elastic modulus is 205 GPa (29.7 Msi). 8622H 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). A is the default condition FabDigit quotes; 8622H is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 29%, better than 91% of steel grades
8622H properties
Typical room-temperature values for 8622H; 22 are specific to this condition. Other listed values are 8622 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
8622H 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
8622H has a yield strength of 395 MPa (57.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 63% of steel grades. Elongation at break is 29% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
8622H is rated for continuous service to 400°C (752 °F). It conducts heat at 46 W/m·K (26.6 BTU/hr·ft·°F), better than 71% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
8622H conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 8622H takes about 31 MJ of energy and emits 2.2 kg of CO₂ — more than 64% of steel grades. Typical recycled content is 30%.
Manufacturability7
8622H's machinability is good (60/100, better than 83% of steel grades); weldability fair (50/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 8622H
Is 8622 easy to machine?
Machine in the annealed or normalized state (~65 % of 1212) with carbide at 120–180 m/min; leave 0.2–0.4 mm grind stock for post-carburize distortion.
Can 8622 be welded?
Weldable with low-hydrogen consumables and 150–250 °C preheat plus post-weld stress relief; never weld carburized surfaces.
Can 8622 be formed, bent or molded?
Good hot forgeability at 1150–1250 °C followed by normalizing; cold bending limited in the cold-drawn temper.
What surface finishes work on 8622?
No anodizing — protect with black oxide, manganese phosphate, zinc plating or oil; carburized cases grind and superfinish well for gear flanks.
8622 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 J404 | 0.2 – 0.25 | 0.22 |
| 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 |
| P | ≤ 0.04 | — |
| Smax; 8622 resulfurized versions run higher | ≤ 0.04 | — |
| Fe | balance | — |
8622H — frequently asked
What is 8622H used for?
8622H is typically used for gears, shafts and spline components. In short: stronger core than 8620; H-band grade available; gear and spline steel.
What is the yield strength of 8622H?
8622H has a typical yield strength of 395 MPa (57.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 63% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 8622H easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machine in the annealed or normalized state (~65 % of 1212) with carbide at 120–180 m/min; leave 0.2–0.4 mm grind stock for post-carburize distortion.
Can 8622H be welded?
With care — weldability is rated fair (50/100). Weldable with low-hydrogen consumables and 150–250 °C preheat plus post-weld stress relief; never weld carburized surfaces.
What surface finishes work on 8622H?
No anodizing — protect with black oxide, manganese phosphate, zinc plating or oil; carburized cases grind and superfinish well for gear flanks.
Can 8622H be formed, bent or molded?
Good hot forgeability at 1150–1250 °C followed by normalizing; cold bending limited in the cold-drawn temper.
What is the maximum service temperature of 8622H?
8622H 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 8622-A and 8622 CARB?
A is the default condition — standard stocked condition for machining gear blanks before carburizing; softest and most stable. CARB: the intended service condition: hard wear/pitting-resistant case over a tough 30–40 HRC core for gears and pinions. Yield strength is 390 MPa in A versus 950 MPa in CARB.
Sources
- SAE J404 — Chemical Compositions of SAE Alloy Steels — SAE International (2021)
- SAE J1268 — Hardenability Bands for Carbon and Alloy H Steels — SAE International (2019)
- ASTM A29/A29M — Steel Bars, Carbon and Alloy, Hot-Wrought — ASTM (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4 — Heat Treating (Carburizing) — ASM International (1991)
- ASM Handbook Vol.16 — Machining — ASM International (1989)
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.