Stainless Steel 1.4580 1/4H
Supply condition
EN 1.4580 · UNS S31640 · AISI/SAE 316Cb
1/4H = quarter hard
Strip/sheet where roughly double the annealed yield strength is required and only mild forming follows.
Values for the 1/4H condition
Other 1.4580 tempers and conditions
1.4580 is listed in 5 conditions; see the grade overview at 1.4580.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault solution annealed (~1020–1120 °C, rapid quench) | Standard stocked condition for plate, bar, tube and fittings; maximum corrosion resistance and ductility for forming and welding. | 260 | 570 | 45 | 165 HB | — |
Cold drawn | Cold-drawn bar for machined fittings and shafts where higher yield strength and tight tolerance are needed. | 500 | 700 | 25 | 220 HB | — |
1/4HThis page Quarter hard | Strip/sheet where roughly double the annealed yield strength is required and only mild forming follows. | 620 | 900 | 15 | 25 HRC | 2.3 % IACS |
Half hard | High-strength strip for springs, clamps and structural sheet parts with minimal subsequent forming. | 820 | 1,070 | 12 | 32 HRC | 2.3 % IACS |
Full hard | Maximum strength thin strip; supplied on special order only, essentially non-formable and requires post-weld annealing. | 1,000 | 1,300 | 8 | 38 HRC | 2.3 % IACS |
What is 1.4580 1/4H?
1.4580 1/4H is 1.4580 supplied in the 1/4H condition — strip/sheet where roughly double the annealed yield strength is required and only mild forming follows. 1.4580 1/4H has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 195 GPa (28.3 Msi). 1.4580 1/4H has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,385°C (2,525 °F). Annealed is the default condition FabDigit quotes; 1/4H is available on request or by drawing note.
Advantages
- High strength — 620 MPa (89.9 ksi), better than 88% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Limited ductility — 15%, worse than 89% of stainless steel grades
1.4580 1/4H properties
Typical room-temperature values for 1.4580 1/4H; 24 are specific to this condition. Other listed values are 1.4580 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4580 1/4H has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,385°C (2,525 °F).
Mechanical16
1.4580 1/4H has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
1.4580 1/4H is rated for continuous service to 300°C (572 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 16 µm/m·K (8.89 µin/in·°F).
Electrical3
1.4580 1/4H conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 68% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4580 1/4H takes about 53 MJ of energy and emits 4.8 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
1.4580 1/4H's machinability is fair (44/100, better than 81% of stainless steel grades); weldability very good (75/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4580 1/4H
Is 1.4580 easy to machine?
Machines like 316 — gummy, work-hardening: use rigid setups, sharp positive-rake carbide, 60–120 m/min, heavy feed to stay under the hardened skin, and copious flood coolant.
Can 1.4580 be welded?
Excellent weldability by GTAW/GMAW/SMAW without post-weld annealing; use Nb- or Mo-bearing filler (ER318 / E318-16, or 316L), keep interpass below ~150 °C, no preheat needed.
Can 1.4580 be formed, bent or molded?
Good cold formability in the annealed condition but higher springback and forming loads than carbon steel; hot work 1150–900 °C followed by solution anneal at 1020–1120 °C and rapid cooling.
What surface finishes work on 1.4580?
Pickle and passivate (ASTM A967) after welding to restore the passive film; grinds, brushes and electropolishes well, though Nb carbides can leave faint streaks on mirror finishes.
1.4580 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 |
|---|---|---|
| CEN 10088-3 max 0.08 | ≤ 0.08 | 0.05 |
| Si | ≤ 1 | 0.5 |
| Mn | ≤ 2 | 1.5 |
| P | ≤ 0.05 | 0.03 |
| S | ≤ 0.02 | 0.01 |
| Cr | 16.5 – 18.5 | 17.5 |
| Ni | 10.5 – 13.5 | 12 |
| Mo | 2 – 2.5 | 2.2 |
| NbNb ≥ 10 × C (stabilization); UNS S31640 allows up to 1.10 | ≤ 1 | 0.7 |
| Nnot always specified for stabilized grades | ≤ 0.1 | 0.03 |
| Fe | balance | — |
1.4580 1/4H — frequently asked
What is 1.4580 1/4H used for?
1.4580 1/4H is typically used for welded chemical equipment, high-temperature piping and pressure vessels. In short: nb-stabilised 316 type; no post-weld anneal needed; 800 °C service capability.
What is the yield strength of 1.4580 1/4H?
1.4580 1/4H has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 88% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4580 1/4H easy to machine?
Not especially — machinability is rated fair (44/100, better than 81% of stainless steel grades). Machines like 316 — gummy, work-hardening: use rigid setups, sharp positive-rake carbide, 60–120 m/min, heavy feed to stay under the hardened skin, and copious flood coolant.
Can 1.4580 1/4H be welded?
Yes — weldability is rated very good (75/100). Excellent weldability by GTAW/GMAW/SMAW without post-weld annealing; use Nb- or Mo-bearing filler (ER318 / E318-16, or 316L), keep interpass below ~150 °C, no preheat needed.
What surface finishes work on 1.4580 1/4H?
Pickle and passivate (ASTM A967) after welding to restore the passive film; grinds, brushes and electropolishes well, though Nb carbides can leave faint streaks on mirror finishes.
Can 1.4580 1/4H be formed, bent or molded?
Good cold formability in the annealed condition but higher springback and forming loads than carbon steel; hot work 1150–900 °C followed by solution anneal at 1020–1120 °C and rapid cooling.
What is the maximum service temperature of 1.4580 1/4H?
1.4580 1/4H is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4580 Annealed and 1.4580-FH?
Annealed is the default condition — standard stocked condition for plate, bar, tube and fittings; maximum corrosion resistance and ductility for forming and welding. FH: maximum strength thin strip; supplied on special order only, essentially non-formable and requires post-weld annealing. Yield strength is 260 MPa in Annealed versus 1,000 MPa in FH.
Sources
- EN 10088-1/-2/-3 Stainless steels — grades, sheet/plate and bar — CEN (2014)
- EN 10028-7 Flat products for pressure purposes — stainless steels — CEN (2016)
- ASTM A240/A240M Chromium and chromium-nickel stainless steel plate, sheet and strip — ASTM (2023)
- ASTM A666 Annealed or cold-worked austenitic stainless steel sheet, strip, plate and flat bar — ASTM (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
- Stainless steel 1.4580 / 316Cb technical data — European stainless producers (e.g. Outokumpu, Deutsche Edelstahlwerke) (2022)
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.