Stainless Steel 1.4570
EN 1.4570
1.4570 (X6CrNiCuS18-9-2, S30300, 303Cu) is a resulfurised, copper-bearing free-machining austenitic stainless based on 18/9 chemistry.
Reference datasheet — 1.4570 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 +AT condition
1.4570 tempers and conditions
1.4570 is supplied in 7 conditions, soft to hard. +AT is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+ATDefault Solution annealed | Softest and most corrosion-resistant condition; pick for large-diameter bar, subsequent cold forming, or when maximum ductility is needed. | 260 | 600 | 45 | 175 HB | — |
Annealed then bright cold drawn | Default stock condition for automatic-lathe bar: good size tolerance, straightness and chip control with a modest strength increase. | 500 | 700 | 18 | 220 HB | — |
Cold worked to tensile class Rm ≥ 700 MPa | Lightest EN 10088-3 cold-worked strength class; use for larger diameters where only a small strength uplift is required. | 520 | 760 | 20 | 20 HRC | 2.4 % IACS |
+CG / h6 | Choose when close diameter tolerance (h6/h7) and a smooth turned-free surface are needed for shafts running in bushings. | 520 | 720 | 16 | 19 HRC | 2.4 % IACS |
Cold worked to tensile class Rm ≥ 800 MPa | Most common cold-worked strength class for small/medium free-machining bar in screw-machine work. | 620 | 860 | 13 | 25 HRC | 2.4 % IACS |
Cold worked to tensile class Rm ≥ 900 MPa | Higher-strength drawn bar for small-diameter shafts and pins that must resist bending without heat treatment. | 720 | 960 | 9 | 30 HRC | 2.4 % IACS |
Cold worked to tensile class Rm ≥ 1000 MPa | Maximum standard cold-drawn strength, limited to small diameters; ductility and impact toughness are low. | 820 | 1,060 | 7 | 33 HRC | 2.4 % IACS |
What is 1.4570?
1.4570 (X6CrNiCuS18-9-2, S30300, 303Cu) is a resulfurised, copper-bearing free-machining austenitic stainless based on 18/9 chemistry. Manganese sulfide inclusions give a machinability score of 72 — the highest in the austenitic family — with 260 MPa yield, 600 MPa tensile, 45 % elongation and 175 HB in the annealed condition; stock forms are annealed, cold-drawn (+C700 to +C1000) and centreless-ground bar. The trade-offs are hot-cracking during welding, corrosion resistance of only 55 versus 304, and poor transverse ductility from the sulfide stringers. Choose 1.4404/316L when parts must be welded or see chlorides. 1.4570 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F). 1.4570 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 193 GPa (28 Msi).
What is 1.4570 used for?
- precision machined parts
- fittings
- fasteners
- valve components
Advantages
- Easy to machine — 72/100, better than 99% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- Hard to polish — 40/100, worse than 99% of stainless steel grades
- Difficult to weld — 20/100, worse than 95% of stainless steel grades
- Low strength — 260 MPa (37.7 ksi), worse than 84% of stainless steel grades
1.4570 properties
Typical room-temperature values for 1.4570-+AT; bars are the position among stainless steel grades.
Physical3
1.4570 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
1.4570 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
1.4570 is rated for continuous service to 760°C (1,400 °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 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
1.4570 conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4570 takes about 53 MJ of energy and emits 5 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
1.4570's machinability is very good (72/100, better than 99% of stainless steel grades); weldability poor (20/100); formability fair (35/100).
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 stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. 1.4570 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4570
Is 1.4570 easy to machine?
Best-machining austenitic stainless: run ~30–50 % higher speeds than 304, use sharp positive-rake carbide, high-pressure flood coolant and avoid dwelling to prevent work-hardened glazing.
Can 1.4570 be welded?
Not recommended — 0.15–0.35 % S causes hot (solidification) cracking; if unavoidable use 312 or 309 filler, minimal heat input and no restraint.
Can 1.4570 be formed, bent or molded?
Only light bending and mild cold heading; sulfide stringers make transverse ductility poor, so bend across the rolling direction with generous radii and hot form at 1150–1200 °C.
1.4570 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 |
|---|---|---|
| CX6 designation | ≤ 0.06 | 0.05 |
| Si | ≤ 1 | 0.5 |
| Mncombines with S as MnS chip breakers | ≤ 2 | 1.5 |
| P | ≤ 0.05 | 0.03 |
| Sfree-machining addition | 0.15 – 0.35 | 0.27 |
| Cr | 17 – 19 | 18 |
| Ni | 8 – 10 | 9 |
| Culowers work hardening, improves cold heading and chip control | 1.3 – 2.5 | 1.9 |
| Moresidual, optional | ≤ 0.8 | 0.3 |
| N | ≤ 0.11 | 0.05 |
| Fe | balance |
What surface finishes work on 1.4570?
Passivate per ASTM A967 (nitric-based, note sulfide attack risk) after machining; electropolishing and mirror polishing are difficult because inclusions pull out — plating or black oxide are common alternatives.
Surface treatments FabDigit runs on stainless 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).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel 1.4570 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X6CrNiCuS18-9-2
- Similar grades
- S30300303Cu
How much does 1.4570 cost?
1.4570 is a standard-cost stainless steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
1.4570 — frequently asked
What is 1.4570 used for?
1.4570 is typically used for precision machined parts, fittings, fasteners and valve components. In short: best-machining austenitic stainless; free-machining 303 variant; not recommended for welding.
What is the yield strength of 1.4570?
1.4570 has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 84% of stainless steel grades. Strength varies by condition: see the 7 listed tempers.
Is 1.4570 easy to machine?
Yes — machinability is rated very good (72/100, better than 99% of stainless steel grades). Best-machining austenitic stainless: run ~30–50 % higher speeds than 304, use sharp positive-rake carbide, high-pressure flood coolant and avoid dwelling to prevent work-hardened glazing.
Can 1.4570 be welded?
Not readily — weldability is rated poor (20/100). Not recommended — 0.15–0.35 % S causes hot (solidification) cracking; if unavoidable use 312 or 309 filler, minimal heat input and no restraint.
What surface finishes work on 1.4570?
Passivate per ASTM A967 (nitric-based, note sulfide attack risk) after machining; electropolishing and mirror polishing are difficult because inclusions pull out — plating or black oxide are common alternatives.
Can 1.4570 be formed, bent or molded?
Only light bending and mild cold heading; sulfide stringers make transverse ductility poor, so bend across the rolling direction with generous radii and hot form at 1150–1200 °C.
What is the maximum service temperature of 1.4570?
1.4570 is rated for continuous use to about 760°C (1,400 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 1.4570 cost?
1.4570 is a standard-cost stainless steel ($$), cheaper than about 71% 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
- EN 10088-3 Stainless steels — Semi-finished products, bars, rods, sections — CEN (2014)
- EN 10088-1 Stainless steels — List of stainless steels (physical properties) — CEN (2014)
- ASTM A582/A582M Free-Machining Stainless Steel Bars — ASTM (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- ASM Handbook Vol.16 — Machining (machinability ratings) — ASM International (1989)
- Free-machining austenitic bar datasheets (Outokumpu, Sandvik, Ugitech) — various producers (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.