Steel 5147-SA (Spheroidize annealed)
Heat-treated state
AISI/SAE 5147 · UNS G51470
Choose for cold heading, upsetting or deep machining where maximum softness and globular carbides are needed.
Values for the SA condition
Other 5147 tempers and conditions
5147 is listed in 10 conditions; see the grade overview at 5147.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SAThis page Spheroidize annealed | Choose for cold heading, upsetting or deep machining where maximum softness and globular carbides are needed. | 340 | 620 | 26 | 180 HB | 8 % IACS |
ADefault Solution annealed | Softest supply condition for machining, cold forming and subsequent quench-and-temper of the finished part. | 365 | 675 | 22 | 197 HB | — |
Hot rolled | Cheapest mill condition for forging stock or parts that will be heat treated after rough machining. | 500 | 830 | 17 | 22 HRC | 7.8 % IACS |
Normalized | Uniform fine pearlitic structure for forged blanks before machining or hardening; higher strength than annealed. | 680 | 1,020 | 19 | 31 HRC | 7.8 % IACS |
Cold drawn | Pick for close size tolerance, straightness and higher as-supplied yield strength in shafting. | 700 | 830 | 12 | 24 HRC | 7.8 % IACS |
Q&T 26-32 HRC | Tough general-purpose through-hardened condition for shafts and structural links where impact matters more than strength. | 850 | 970 | 18 | 29 HRC | — |
Induction hardened | Use when a hard wear surface (55-60 HRC) with a tough 30-35 HRC core is required, e.g. journals and cam surfaces. | 1,000 | 1,150 | 12 | 57 HRC | 7.5 % IACS |
Q&T 32-38 HRC | Balanced strength/toughness for gear blanks, connecting rods and steering components. | 1,030 | 1,150 | 15 | 35 HRC | — |
Q&T 38-44 HRC | High-strength through-hardened condition for highly loaded pins, rollers and torsion parts. | 1,270 | 1,400 | 11 | 41 HRC | — |
Q&T 44-48 HRC | Maximum practical through-hardness for wear-loaded parts; low toughness, notch-sensitive, use only on modest sections. | 1,450 | 1,600 | 9 | 46 HRC | — |
What is 5147-SA?
5147-SA is 5147 heat treated to SA — choose for cold heading, upsetting or deep machining where maximum softness and globular carbides are needed. 5147-SA has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 76% of steel grades. Elongation at break is 26% and the elastic modulus is 205 GPa (29.7 Msi). 5147-SA 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). A is the default condition FabDigit quotes; SA is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 26%, better than 82% of steel grades
Limitations
- Low strength — 340 MPa (49.3 ksi), worse than 76% of steel grades
5147-SA properties
Typical room-temperature values for 5147-SA; 22 are specific to this condition. Other listed values are 5147 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
5147-SA 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).
Mechanical16
5147-SA has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 76% of steel grades. Elongation at break is 26% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
5147-SA is rated for continuous service to 400°C (752 °F). It conducts heat at 43 W/m·K (24.8 BTU/hr·ft·°F), better than 51% of steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
5147-SA conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 5147-SA 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
5147-SA's machinability is good (60/100, better than 83% of steel grades); weldability fair (38/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 5147-SA
Is 5147 easy to machine?
Machine in the annealed or spheroidized condition (≈60 % of 1212); above 35 HRC use carbide or CBN with rigid setups and finish-grind critical fits.
Can 5147 be welded?
Poor weldability — 0.48 % C with 1 % Cr gives high hardenability; preheat 250–350 °C, low-hydrogen consumables and immediate stress relief/temper, or avoid welding entirely.
Can 5147 be formed, bent or molded?
Hot forge 1050–1200 °C, finish above 900 °C and normalize; cold forming only in spheroidized condition with generous bend radii.
What surface finishes work on 5147?
No anodizing; use phosphate + oil, black oxide, zinc or hard chrome plating, and bake after plating to avoid hydrogen embrittlement above 1000 MPa.
5147 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 | 0.46 – 0.51 | 0.49 |
| Mn | 0.7 – 0.95 | 0.82 |
| Crtighter/higher Cr band than 5145 | 0.85 – 1.15 | 1 |
| Si | 0.15 – 0.35 | 0.25 |
| P | ≤ 0.04 | — |
| S | ≤ 0.04 | — |
| Fe | balance | — |
5147-SA — frequently asked
What is 5147-SA used for?
5147-SA is typically used for shafts, gears and fasteners. In short: tighter-chemistry 5145 variant; high hardenability, 48 HRC capable; needs protective coating.
What is the yield strength of 5147-SA?
5147-SA has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 76% of steel grades. Strength varies by condition: see the 10 listed tempers.
Is 5147-SA easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machine in the annealed or spheroidized condition (≈60 % of 1212); above 35 HRC use carbide or CBN with rigid setups and finish-grind critical fits.
Can 5147-SA be welded?
With care — weldability is rated fair (38/100). Poor weldability — 0.48 % C with 1 % Cr gives high hardenability; preheat 250–350 °C, low-hydrogen consumables and immediate stress relief/temper, or avoid welding entirely.
What surface finishes work on 5147-SA?
No anodizing; use phosphate + oil, black oxide, zinc or hard chrome plating, and bake after plating to avoid hydrogen embrittlement above 1000 MPa.
Can 5147-SA be formed, bent or molded?
Hot forge 1050–1200 °C, finish above 900 °C and normalize; cold forming only in spheroidized condition with generous bend radii.
What is the maximum service temperature of 5147-SA?
5147-SA 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 5147-A and 5147-IH?
A is the default condition — softest supply condition for machining, cold forming and subsequent quench-and-temper of the finished part. IH: use when a hard wear surface (55-60 HRC) with a tough 30-35 HRC core is required, e.g. journals and cam surfaces. Yield strength is 365 MPa in A versus 1,000 MPa in IH.
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, General Requirements — 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)
- Machinery's Handbook, 31st ed. — Industrial Press (2020)
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.