Steel 1118
AISI/SAE 1118 · UNS G11180
1118 (UNS G11180) is a resulfurized free-machining carburizing steel that balances sulfur content for chip control with enough carbon and manganese to respond well to case hardening.
Reference datasheet — 1118 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 CD condition
1118 tempers and conditions
1118 is supplied in 6 conditions, soft to hard. CD is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot rolled | Cheapest form for parts fully machined all over or for subsequent carburizing. | 250 | 450 | 32 | 131 HB | — |
Solution annealed | Softest condition for cold forming, deep drawing or severe upsetting before hardening. | 285 | 450 | 35 | 131 HB | 10.5 % IACS |
Normalized | Uniform fine grain before carburizing or heavy machining of forgings. | 320 | 480 | 33 | 143 HB | 10.5 % IACS |
Cold Drawn, Stress Relieved | Pick when unbalanced machining would otherwise bow the part; keeps most cold-drawn strength. | 415 | 505 | 18 | 143 HB | 10.5 % IACS |
CDDefault Cold drawn | Standard stocked condition: good size tolerance, straightness and the best chip control for screw-machine work. | 450 | 525 | 15 | 149 HB | — |
Carburized, Quenched & Tempered | Choose for wear surfaces: hard 58–62 HRC case over a tough ~30 HRC core; case depth typically 0.5–1.5 mm. | 550 | 760 | 14 | 60 HRC | — |
Supply forms, finishes and certifications
Ways 1118 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
TGP | Turned, Ground & Polished | Surface finish |
What is 1118?
1118 (UNS G11180) is a resulfurized free-machining carburizing steel that balances sulfur content for chip control with enough carbon and manganese to respond well to case hardening. It is widely stocked as hot-rolled, cold-drawn, cold-drawn stress-relieved, turned-ground-polished, annealed and normalized bar, with cold-drawn values of about 450 MPa yield, 525 MPa tensile, 15 % elongation and 149 HB (80 HRB). Machinability is rated 85 (about 90 % of 1212), but weldability is marginal and transverse ductility is limited by sulfide stringers. Use 1117 where a lower sulfur level is preferred, or 8620 for heavier-duty carburized gearing. 1118 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). 1118 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 525 MPa (76.1 ksi) — stronger than 52% of steel grades. Elongation at break is 15% and the elastic modulus is 200 GPa (29 Msi).
What is 1118 used for?
- Carburized pins
- shafts
- gears
- fasteners
Advantages
- Easy to machine — 85/100, better than 98% of steel grades
- Conducts heat well — 51.9 W/m·K (30 BTU/hr·ft·°F), better than 96% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- High electrical conductivity — 10.5 % IACS, better than 89% of steel grades
Limitations
- Hard to polish — 35/100, worse than 99% of steel grades
1118 properties
Typical room-temperature values for 1118-CD; bars are the position among steel grades.
Physical3
1118 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
1118 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 525 MPa (76.1 ksi) — stronger than 52% of steel grades. Elongation at break is 15% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1118 is rated for continuous service to 400°C (752 °F). It conducts heat at 51.9 W/m·K (30 BTU/hr·ft·°F), better than 96% of steel grades. Thermal expansion is 11.9 µm/m·K (6.61 µin/in·°F).
Electrical3
1118 conducts electricity at 10.5 % IACS, better than 89% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of 1118 takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 35%.
Manufacturability7
1118's machinability is excellent (85/100, better than 98% of steel grades); weldability fair (45/100); formability fair (50/100).
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. 1118 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1118
Is 1118 easy to machine?
Excellent — 90 % of 1212; run high speeds with sulfurized or soluble oil, expect short broken chips and long tool life.
Can 1118 be welded?
Marginal — high sulfur promotes hot cracking and porosity; if unavoidable use low-hydrogen filler, preheat 100–150 °C and low heat input.
Can 1118 be formed, bent or molded?
Moderate cold formability in the annealed state; sulfide stringers cause poor transverse ductility, so avoid tight transverse bends and severe cold heading.
1118 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 J403 / ASTM A29 heat analysis | 0.14 – 0.2 | 0.17 |
| Mncombines with S as MnS for chip breaking | 1.3 – 1.6 | 1.45 |
| P | ≤ 0.04 | 0.02 |
| Sresulfurized, intentional | 0.08 – 0.13 | 0.1 |
| Sinot normally specified for resulfurized grades | ≤ 0.1 | 0.05 |
| Fe | balance |
What surface finishes work on 1118?
Not anodizable; protect with zinc or nickel plating, black oxide, phosphate + oil, or paint. MnS inclusions limit mirror polishing and can pit in plating baths.
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 1118 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- G11180
How much does 1118 cost?
1118 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.
1118 — frequently asked
What is 1118 used for?
1118 is typically used for carburized pins, shafts, gears and fasteners. In short: free-machining carburizing steel; about 90 % of 1212; case-hardens with good core.
What is the yield strength of 1118?
1118 has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 525 MPa (76.1 ksi) — stronger than 52% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 1118 easy to machine?
Yes — machinability is rated excellent (85/100, better than 98% of steel grades). Excellent — 90 % of 1212; run high speeds with sulfurized or soluble oil, expect short broken chips and long tool life.
Can 1118 be welded?
With care — weldability is rated fair (45/100). Marginal — high sulfur promotes hot cracking and porosity; if unavoidable use low-hydrogen filler, preheat 100–150 °C and low heat input.
What surface finishes work on 1118?
Not anodizable; protect with zinc or nickel plating, black oxide, phosphate + oil, or paint. MnS inclusions limit mirror polishing and can pit in plating baths.
Can 1118 be formed, bent or molded?
Moderate cold formability in the annealed state; sulfide stringers cause poor transverse ductility, so avoid tight transverse bends and severe cold heading.
What is the maximum service temperature of 1118?
1118 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 1118-CD and 1118-HR?
CD is the default condition — standard stocked condition: good size tolerance, straightness and the best chip control for screw-machine work. HR: cheapest form for parts fully machined all over or for subsequent carburizing. Yield strength is 450 MPa in CD versus 250 MPa in HR.
How much does 1118 cost?
1118 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 J403 — Chemical Compositions of SAE Carbon Steels — SAE International (2014)
- ASTM A29/A29M — Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements — ASTM (2020)
- ASTM A108 — Steel Bar, Carbon and Alloy, Cold-Finished — ASTM (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.16 — Machining (machinability ratings) — ASM International (1989)
- MatWeb / MMPDS typical carbon-steel property tables — MatWeb LLC (2023)
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.