Steel 8822
AISI/SAE 8822 · UNS G88220
8822 is a higher-alloy nickel-chromium-molybdenum carburizing steel (UNS G88220) for heavy-duty gearing that needs both high core strength and deep case hardenability.
Reference datasheet — 8822 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 A condition
8822 tempers and conditions
8822 is supplied in 7 conditions, soft to hard. A is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ADefault Solution annealed | Standard stock condition for gear blanks: softest, best machinability and most uniform response to subsequent carburizing. | 415 | 620 | 22 | 187 HB | — |
Hot rolled | Cheapest mill condition for parts that will be rough-machined then carburized; hardness and structure vary with section size. | 450 | 700 | 20 | 15 HRC | 7.8 % IACS |
Normalized | Grain refinement and structure homogenization before rough machining/carburizing; higher strength than annealed with fair machinability. | 480 | 750 | 20 | 17 HRC | 7.8 % IACS |
Cold drawn | Close-tolerance bright bar for small shafts and pins machined with light stock removal before case hardening. | 570 | 720 | 14 | 16 HRC | 7.8 % IACS |
Q&T 28–32 HRC | Direct-quenched-and-tempered bar or the target core condition of large carburized gears needing high core strength with good toughness. | 800 | 960 | 16 | 30 HRC | — |
Q&T 32–36 HRC | Chosen when heavy-duty gear or shaft cores must resist bending and case crushing; toughness margin is lower than 28–32 HRC. | 960 | 1,110 | 14 | 34 HRC | — |
Carburized, hardened & tempered | The service condition for gears and splines: hard wear/pitting-resistant case over a strong Ni-Cr-Mo core; requires finish grinding. | 1,000 | 1,250 | 10 | 60 HRC | — |
What is 8822?
8822 is a higher-alloy nickel-chromium-molybdenum carburizing steel (UNS G88220) for heavy-duty gearing that needs both high core strength and deep case hardenability. It is used for truck and power-transmission gears carburized to a 58-62 HRC case over a core quenched and tempered to 28-32 or 32-36 HRC, and is supplied as hot-rolled, annealed, normalized and cold-drawn bar. Default properties are 415 MPa yield, 620 MPa tensile, 22% elongation and 187 HB (90 HRB). Machinability is about 60% of AISI 1212 and the steel has no corrosion resistance; 8720 costs less where core strength demands are lower. 8822 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). 8822 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 56% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi).
What is 8822 used for?
- Heavy truck transmission gears
- Power transmission gears
- Final-drive ring and pinion gears
- Axle shafts
- Bearing races
- Large splined shafts
- Off-highway gearbox gears
Advantages
- Polishes to a fine finish — 65/100, better than 78% of steel grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
8822 properties
Typical room-temperature values for 8822-A; bars are the position among steel grades.
Physical3
8822 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).
Mechanical13
8822 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 56% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
8822 is rated for continuous service to 200°C (392 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
8822 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 8822 takes about 34 MJ of energy and emits 2.3 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
8822's machinability is good (55/100, better than 62% of steel grades); weldability fair (40/100); formability fair (45/100).
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. 8822 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 8822
Is 8822 easy to machine?
Machine in the annealed/normalized state with carbide tooling and rigid setups (≈60 % of 1212); finish-grind after carburizing since the 58–62 HRC case is not turnable.
Can 8822 be welded?
Weldable only before carburizing with low-hydrogen consumables, 200–300 °C preheat and post-weld stress relief; welding hardened case leads to cracking.
Can 8822 be formed, bent or molded?
Hot forge 1100–1200 °C and normalize afterwards; cold forming limited to mild upsetting on annealed bar.
8822 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 / ASTM A29 | 0.2 – 0.25 | 0.22 |
| 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 |
| Mohighest Mo of the 88xx series | 0.3 – 0.4 | 0.35 |
| P | ≤ 0.04 | |
| Smax; H-grades and 8822H per SAE J1268 | ≤ 0.04 | |
| Fe | balance |
What surface finishes work on 8822?
Protect with oil, black oxide, Mn-phosphate or Zn/Zn-Ni plating (bake for hydrogen relief); shot peening after grinding raises gear bending fatigue.
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 8822 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- G88220
How much does 8822 cost?
8822 is a budget-cost steel ($), cheaper than about 90% 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.
8822 — frequently asked
What is 8822 used for?
8822 is typically used for heavy truck transmission gears, power transmission gears, final-drive ring and pinion gears, axle shafts, bearing races and large splined shafts. In short: high core strength gear steel; deep case hardenability; higher alloy than 8720.
What is the yield strength of 8822?
8822 has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 56% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 8822 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machine in the annealed/normalized state with carbide tooling and rigid setups (≈60 % of 1212); finish-grind after carburizing since the 58–62 HRC case is not turnable.
Can 8822 be welded?
With care — weldability is rated fair (40/100). Weldable only before carburizing with low-hydrogen consumables, 200–300 °C preheat and post-weld stress relief; welding hardened case leads to cracking.
What surface finishes work on 8822?
Protect with oil, black oxide, Mn-phosphate or Zn/Zn-Ni plating (bake for hydrogen relief); shot peening after grinding raises gear bending fatigue.
Can 8822 be formed, bent or molded?
Hot forge 1100–1200 °C and normalize afterwards; cold forming limited to mild upsetting on annealed bar.
What is the maximum service temperature of 8822?
8822 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 8822-A and 8822 CARB?
A is the default condition — standard stock condition for gear blanks: softest, best machinability and most uniform response to subsequent carburizing. CARB: the service condition for gears and splines: hard wear/pitting-resistant case over a strong Ni-Cr-Mo core; requires finish grinding. Yield strength is 415 MPa in A versus 1,000 MPa in CARB.
How much does 8822 cost?
8822 is a budget-cost steel ($), cheaper than about 90% 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
- 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. 4A — Steel Heat Treating Fundamentals and Processes (carburizing) — ASM International (2013)
- Machining Data Handbook — Metcut Research Associates (1980)
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.