Steel 8627
AISI/SAE 8627 · UNS G86270
8627 is a nickel-chromium-molybdenum carburizing steel (UNS G86270) with carbon between 8625 and 8630, giving good hardenability for medium-section case-hardened parts that also need higher core strength.
Reference datasheet — 8627 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
8627 tempers and conditions
8627 is supplied in 10 conditions, soft to hard. A is the default FabDigit quotes; the values on this page are for it.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ADefault Solution annealed | Softest and most machinable condition; standard supply state for bar that will be machined then carburized. | 380 | 560 | 30 | 156 HB | — |
Hot rolled | Cheapest mill condition for parts that will be fully heat treated after rough machining. | 400 | 640 | 24 | 185 HB | — |
Normalized | Uniform fine-grained structure with better core toughness and machined-surface finish before carburizing. | 430 | 690 | 25 | 195 HB | — |
Cold drawn | Tight-tolerance bright bar with raised yield strength for shafts and pins machined with light stock removal. | 620 | 720 | 15 | 217 HB | — |
Q&T 650 °C | Softest Q&T condition, maximum toughness and ductility for shock-loaded or later-machined parts. | 635 | 795 | 23 | 22 HRC | — |
Carburized & hardened | Primary intended use: hard wear-resistant case (58–62 HRC) over a tough, higher-strength core than 8620. | 790 | 1,030 | 13 | 60 HRC | — |
Q&T 540 °C | Pick the oil quenched, 540 °C tempered state (~28–32 HRC) for machined shafts and tough cores, giving 830 MPa yield and 18% elongation with moderate machinability. | 830 | 965 | 18 | 30 HRC | — |
Q&T 425 °C | Balanced strength/toughness around 36–38 HRC for shafts and highly loaded fasteners. | 1,000 | 1,170 | 14 | 38 HRC | — |
Q&T 315 °C | High strength with slightly improved ductility; avoid this range if temper embrittlement/impact toughness matters. | 1,170 | 1,380 | 11 | 43 HRC | — |
Q&T 205 °C | Maximum through-hardened strength for wear parts where impact loading is low. | 1,240 | 1,500 | 10 | 46 HRC | — |
What is 8627?
8627 is a nickel-chromium-molybdenum carburizing steel (UNS G86270) with carbon between 8625 and 8630, giving good hardenability for medium-section case-hardened parts that also need higher core strength. It is available hot-rolled, annealed, normalized, cold-drawn, carburized, and quenched and tempered over a 205–650 °C tempering range; the annealed condition is about 380 MPa yield, 560 MPa tensile, 30 % elongation and 156 HB (82 HRB). The ~0.27 % C level lowers weldability (score 52) and formability compared with 8617, and machinability sits near 60 % of 1212; 8620 is the alternative where easier welding or forming governs. 8627 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). 8627 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 68% of steel grades. Elongation at break is 30% and the elastic modulus is 205 GPa (29.7 Msi).
What is 8627 used for?
- gears
- shafts
- axle components
- heavy fasteners
Advantages
- Ductile — tolerates forming and impact — 30%, better than 93% of steel grades
8627 properties
Typical room-temperature values for 8627-A; bars are the position among steel grades.
Physical3
8627 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical13
8627 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 68% of steel grades. Elongation at break is 30% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
8627 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 11.9 µm/m·K (6.61 µin/in·°F).
Electrical3
8627 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 8627 takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 35%.
Manufacturability7
8627's machinability is good (58/100, better than 75% of steel grades); weldability fair (52/100); formability good (55/100).
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. 8627 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 8627
Is 8627 easy to machine?
Machines well annealed or normalized (~60–65 % of 1212) with carbide tooling; rough machine before carburizing and finish-grind the hardened case.
Can 8627 be welded?
Weldable with low-hydrogen consumables but the ~0.27 % C and Ni-Cr-Mo content require 200–300 °C preheat and post-weld stress relief/temper; do not weld after carburizing.
Can 8627 be formed, bent or molded?
Hot forge 1100–1200 °C with slow cooling or normalizing afterwards; cold forming limited to mild bending in the annealed condition.
8627 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 | 0.25 – 0.3 | 0.27 |
| 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; H-grade/resulfurized variants differ | ≤ 0.04 | |
| Fe | balance |
What surface finishes work on 8627?
No anodizing — protect bare surfaces with black oxide, manganese phosphate, zinc or nickel plating; bake after plating to avoid hydrogen embrittlement when hardened.
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 8627 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- G86270
How much does 8627 cost?
8627 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.
8627 — frequently asked
What is 8627 used for?
8627 is typically used for gears, shafts, axle components and heavy fasteners. In short: higher core strength carburizing; between 8625 and 8630; medium-section hardenability.
What is the yield strength of 8627?
8627 has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 68% of steel grades. Strength varies by condition: see the 10 listed tempers.
Is 8627 easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machines well annealed or normalized (~60–65 % of 1212) with carbide tooling; rough machine before carburizing and finish-grind the hardened case.
Can 8627 be welded?
With care — weldability is rated fair (52/100). Weldable with low-hydrogen consumables but the ~0.27 % C and Ni-Cr-Mo content require 200–300 °C preheat and post-weld stress relief/temper; do not weld after carburizing.
What surface finishes work on 8627?
No anodizing — protect bare surfaces with black oxide, manganese phosphate, zinc or nickel plating; bake after plating to avoid hydrogen embrittlement when hardened.
Can 8627 be formed, bent or molded?
Hot forge 1100–1200 °C with slow cooling or normalizing afterwards; cold forming limited to mild bending in the annealed condition.
What is the maximum service temperature of 8627?
8627 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 8627-A and 8627-QT205?
A is the default condition — softest and most machinable condition; standard supply state for bar that will be machined then carburized. QT205: maximum through-hardened strength for wear parts where impact loading is low. Yield strength is 380 MPa in A versus 1,240 MPa in QT205.
How much does 8627 cost?
8627 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)
- ASTM A29/A29M — Steel Bars, Carbon and Alloy, Hot-Wrought — ASTM (2020)
- ASTM A322 — Steel Bars, Alloy, Standard Grades — ASTM (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)
- ASM Handbook Vol.16 — Machining — ASM International (1989)
- SAE J1268 — Hardenability Bands for Carbon and Alloy H Steels — SAE International (2019)
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.