Steel 5160 Spheroidize Annealed
Heat-treated state
AISI/SAE 5160 · UNS G51600 · EN 55Cr3, 1.7176
Choose for maximum cold formability/upsetting and best tool life when machining before hardening.
Values for the Spheroidize Annealed condition
Other 5160 tempers and conditions
5160 is listed in 11 conditions; see the grade overview at 5160.
- Annealed
- Spheroidize Annealed
- Normalized
- Hot Rolled
- Cold Drawn
- Q&T 650C
- Q&T
- Q&T 425C
- Oil Quenched
- Q&T 315C
- Q&T 205C
Compare all 11 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault full anneal ~815 °C, slow cool | Softest condition for machining, bending and forming before hardening; most commonly stocked bar/flat condition. | 275 | 725 | 17 | 197 HB | — |
Spheroidize AnnealedThis page subcritical, spheroidal carbides | Choose for maximum cold formability/upsetting and best tool life when machining before hardening. | 340 | 660 | 22 | 183 HB | 7.8 % IACS |
855 °C, air cool | Uniform fine pearlitic structure; used to refine grain and homogenize forgings before final hardening. | 530 | 957 | 17.5 | 27 HRC | 7.8 % IACS |
as-rolled bar / flat / coil | Lowest-cost mill condition for parts that will be heat treated after machining or forming. | 550 | 900 | 14 | 25 HRC | 7.8 % IACS |
cold-finished annealed bar | Pick for close size tolerance and straight, bright bar for machined parts prior to hardening. | 700 | 860 | 10 | 24 HRC | 7.8 % IACS |
high temper (≈30 HRC) | Softest tempered condition — maximum ductility/toughness where moderate strength is sufficient. | 895 | 1,005 | 20 | 31 HRC | 7.6 % IACS |
Quenched and tempered | General-purpose high-toughness structural condition for shafts, links and heavy-duty machined parts. | 1,160 | 1,310 | 12 | 42 HRC | — |
medium temper (≈50 HRC) | Balanced strength/toughness level often used for heavy springs, torsion bars and impact tools. | 1,640 | 1,790 | 9 | 50 HRC | 7 % IACS |
Oil Quenched (as-quenched, untempered martensite) | Intermediate process condition only — must be tempered promptly; brittle and crack-prone as quenched. | 1,750 | 2,200 | 1 | 63 HRC | 6.6 % IACS |
medium-low temper (≈53–55 HRC) | High strength with slightly improved toughness over a 205 °C temper; typical for knives and cutting edges. | 1,770 | 2,000 | 6 | 54 HRC | 6.8 % IACS |
oil quenched, low temper (≈58–60 HRC) | Maximum hardness/wear resistance for blades and wear parts; low toughness, use only in thin sections. | 1,790 | 2,220 | 4 | 58 HRC | — |
What is 5160 Spheroidize Annealed?
5160 Spheroidize Annealed is 5160 heat treated to Spheroidize Annealed — choose for maximum cold formability/upsetting and best tool life when machining before hardening. 5160 Spheroidize Annealed has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 660 MPa (95.7 ksi) — weaker than 76% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi). 5160 Spheroidize Annealed 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). Annealed is the default condition FabDigit quotes; Spheroidize Annealed is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 70/100, better than 87% of steel grades
Limitations
- Low strength — 340 MPa (49.3 ksi), worse than 76% of steel grades
5160 Spheroidize Annealed properties
Typical room-temperature values for 5160 Spheroidize Annealed; 22 are specific to this condition. Other listed values are 5160 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
5160 Spheroidize Annealed 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
5160 Spheroidize Annealed has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 660 MPa (95.7 ksi) — weaker than 76% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
5160 Spheroidize Annealed is rated for continuous service to 400°C (752 °F). It conducts heat at 46.6 W/m·K (26.9 BTU/hr·ft·°F), better than 74% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
5160 Spheroidize Annealed conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of 5160 Spheroidize Annealed takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 35%.
Manufacturability8
5160 Spheroidize Annealed's machinability is good (60/100, better than 83% of steel grades); weldability poor (30/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 5160 Spheroidize Annealed
Is 5160 easy to machine?
Machine in the annealed/spheroidized state (~200 HB) with rigid setups and carbide tooling; above ~40 HRC expect grinding or hard-turning with CBN.
Can 5160 be welded?
Poor weldability due to high carbon equivalent — preheat 250–350 °C, use low-hydrogen consumables and temper immediately after welding; avoid welding on finished springs.
Can 5160 be formed, bent or molded?
Hot forge 1150–1200 °C and cool slowly; cold bend only when annealed, then oil quench 830–860 °C and temper 400–540 °C for spring properties (shot peen for fatigue).
What surface finishes work on 5160?
Not anodizable; protect with phosphate + oil, black oxide, paint or zinc/nickel plating (bake to avoid hydrogen embrittlement at high hardness); polishes well when hardened.
5160 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 | 0.56 – 0.64 | 0.6 |
| Mn | 0.75 – 1 | 0.88 |
| Si | 0.15 – 0.35 | 0.25 |
| Cr | 0.7 – 0.9 | 0.8 |
| Pmax, SAE bar practice | ≤ 0.04 | — |
| Smax, SAE bar practice | ≤ 0.04 | — |
| Fe | balance | — |
5160 Spheroidize Annealed — frequently asked
What is 5160 Spheroidize Annealed used for?
5160 Spheroidize Annealed is typically used for leaf springs, suspension components and blades. In short: spring-tempered toughness.
What is the yield strength of 5160 Spheroidize Annealed?
5160 Spheroidize Annealed has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 660 MPa (95.7 ksi) — weaker than 76% of steel grades. Strength varies by condition: see the 11 listed tempers.
Is 5160 Spheroidize Annealed easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machine in the annealed/spheroidized state (~200 HB) with rigid setups and carbide tooling; above ~40 HRC expect grinding or hard-turning with CBN.
Can 5160 Spheroidize Annealed be welded?
Not readily — weldability is rated poor (30/100). Poor weldability due to high carbon equivalent — preheat 250–350 °C, use low-hydrogen consumables and temper immediately after welding; avoid welding on finished springs.
What surface finishes work on 5160 Spheroidize Annealed?
Not anodizable; protect with phosphate + oil, black oxide, paint or zinc/nickel plating (bake to avoid hydrogen embrittlement at high hardness); polishes well when hardened.
Can 5160 Spheroidize Annealed be formed, bent or molded?
Hot forge 1150–1200 °C and cool slowly; cold bend only when annealed, then oil quench 830–860 °C and temper 400–540 °C for spring properties (shot peen for fatigue).
What is the maximum service temperature of 5160 Spheroidize Annealed?
5160 Spheroidize Annealed 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.
Can FabDigit make parts in 5160 Spheroidize Annealed?
Yes — 5160 Spheroidize Annealed is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- SAE J404 / J1249 — Chemical Compositions of SAE Alloy Steels — SAE International (2021)
- ASTM A689 — Carbon and Alloy Steel Bars for Springs — ASTM (2021)
- 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)
- GB/T 1222 — (55CrMnA equivalent) — SAC (2016)
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.