Steel 5147-N (Normalized)
Heat-treated state
AISI/SAE 5147 · UNS G51470
Uniform fine pearlitic structure for forged blanks before machining or hardening; higher strength than annealed.
Values for the N 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 |
|---|---|---|---|---|---|---|
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 |
NThis page 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-N?
5147-N is 5147 heat treated to N — uniform fine pearlitic structure for forged blanks before machining or hardening; higher strength than annealed. 5147-N has a yield strength of 680 MPa (98.6 ksi) and a tensile strength of 1,020 MPa (148 ksi) — stronger than 80% of steel grades. Elongation at break is 19% and the elastic modulus is 205 GPa (29.7 Msi). 5147-N 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; N is available on request or by drawing note.
Advantages
- High strength — 680 MPa (98.6 ksi), better than 80% of steel grades
Limitations
- Low fracture toughness — 62 MPa·√m (56.4 ksi·√in), worse than 76% of steel grades
5147-N properties
Typical room-temperature values for 5147-N; 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-N 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-N has a yield strength of 680 MPa (98.6 ksi) and a tensile strength of 1,020 MPa (148 ksi) — stronger than 80% of steel grades. Elongation at break is 19% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
5147-N is rated for continuous service to 400°C (752 °F). It conducts heat at 44 W/m·K (25.4 BTU/hr·ft·°F), better than 57% of steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
5147-N 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 5147-N 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-N's machinability is fair (46/100, worse than 59% of steel grades); weldability poor (30/100); formability poor (28/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 5147-N
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-N — frequently asked
What is 5147-N used for?
5147-N 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-N?
5147-N has a typical yield strength of 680 MPa (98.6 ksi) and a tensile strength of 1,020 MPa (148 ksi) — stronger than 80% of steel grades. Strength varies by condition: see the 10 listed tempers.
Is 5147-N easy to machine?
Reasonably — machinability is rated fair (46/100, worse than 59% 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-N be welded?
Not readily — weldability is rated poor (30/100). 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-N?
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-N 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-N?
5147-N 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.