Stainless Steel 1.4598
EN 1.4598
1.4598 (X2CrNiMoCuS17-10-2, S31651) is a low-carbon, molybdenum- and copper-bearing austenitic stainless with 0.15–0.35 % sulphur added for free machining.
Reference datasheet — 1.4598 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
1.4598 tempers and conditions
1.4598 is supplied in 6 conditions, soft to hard. AT is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ATDefault solution annealed (softened, water quenched) | Standard stock condition for hot-rolled/peeled bar and for parts needing maximum corrosion resistance and ductility. | 240 | 580 | 35 | 165 HB | — |
peeled / centreless ground and polished bar (annealed base) | Choose when h7/h8 diameter tolerance and a defect-free surface are needed on solution-annealed stock. | 240 | 580 | 35 | 165 HB | 2.3 % IACS |
lightly cold drawn / smooth-turned bar (annealed + skin pass) | Pick for h9/h11 tolerance bar where near-annealed properties and good corrosion resistance must be kept. | 350 | 620 | 28 | 185 HB | 2.3 % IACS |
cold drawn to Rm ≥ 700 MPa | Entry-level cold-drawn strength class for shafts and fasteners with good straightness and chip control. | 420 | 760 | 20 | 215 HB | — |
cold drawn to Rm ≥ 800 MPa | Mid strength class for small-diameter automatic-lathe bar needing higher yield without heat treatment. | 520 | 860 | 16 | 23 HRC | — |
cold drawn to Rm ≥ 900 MPa | Highest standard cold-drawn class, for small bar and pins where strength matters more than ductility. | 620 | 960 | 12 | 28 HRC | — |
What is 1.4598?
1.4598 (X2CrNiMoCuS17-10-2, S31651) is a low-carbon, molybdenum- and copper-bearing austenitic stainless with 0.15–0.35 % sulphur added for free machining. It is chosen for high-volume Swiss and CNC turned parts that still need close to 316L corrosion performance; bar and wire are the usual forms, with about 240 MPa yield, 580 MPa tensile, 35 % elongation, 165 HB and service to 400 °C. The sulphide stringers reduce weldability and cold formability, so use plain 316L bar where welding or deep drawing is required. 1.4598 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,380°C (2,516 °F). 1.4598 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 580 MPa (84.1 ksi) — weaker than 96% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 200 GPa (29 Msi).
What is 1.4598 used for?
- precision machined fittings
- valve parts
- pump components
Advantages
- Easy to machine — 68/100, better than 98% of stainless steel grades
Limitations
- Hard to polish — 35/100, worse than 100% of stainless steel grades
- Low strength — 240 MPa (34.8 ksi), worse than 96% of stainless steel grades
- Difficult to weld — 30/100, worse than 88% of stainless steel grades
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
1.4598 properties
Typical room-temperature values for 1.4598-AT; bars are the position among stainless steel grades.
Physical3
1.4598 has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,380°C (2,516 °F).
Mechanical16
1.4598 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 580 MPa (84.1 ksi) — weaker than 96% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4598 is rated for continuous service to 400°C (752 °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
1.4598 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 1.4598 takes about 55 MJ of energy and emits 4.8 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
1.4598's machinability is good (68/100, better than 98% of stainless steel grades); weldability poor (30/100); formability fair (50/100).
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. 1.4598 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4598
Is 1.4598 easy to machine?
Excellent for CNC/Swiss turning — run ~1.5–1.8× the speed of 316L with sharp positive geometry, high-pressure coolant and no dwelling to avoid work hardening.
Can 1.4598 be welded?
Not recommended for structural welds: the 0.15–0.35% S causes hot cracking; if unavoidable use low heat input, 316L/309L filler and accept reduced properties.
Can 1.4598 be formed, bent or molded?
Suitable for turning, knurling, rolling of threads and mild upsetting; avoid deep drawing or tight cold bends because sulphide stringers open as edge cracks.
1.4598 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 |
|---|---|---|
| Clow-carbon, limits sensitisation | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.5 |
| Mncombines with S as MnS chip breakers | ≤ 2 | 1.5 |
| P | ≤ 0.05 | 0.03 |
| Sdeliberate free-machining addition | 0.15 – 0.35 | 0.25 |
| Cr | 16 – 18.5 | 17 |
| Ni | 10 – 13 | 11 |
| Mo | 1.8 – 2.5 | 2.1 |
| Cuimproves chip formation and cold heading | 1 – 2 | 1.5 |
| N | ≤ 0.11 | 0.05 |
| Fe | balance |
What surface finishes work on 1.4598?
Passivate per ASTM A967 (citric preferred, as nitric can attack sulphides); electropolishing and mirror polishing give a slightly pitted look — not for cosmetic Class-A surfaces.
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 1.4598 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X2CrNiMoCuS17-10-2
- Similar grades
- S31651
How much does 1.4598 cost?
1.4598 is a premium-cost stainless steel ($$$), cheaper than about 51% 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.
1.4598 — frequently asked
What is 1.4598 used for?
1.4598 is typically used for precision machined fittings, valve parts and pump components. In short: free-machining 316L alternative; screw-machine stainless bar; mo-bearing, high-throughput turning.
What is the yield strength of 1.4598?
1.4598 has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 580 MPa (84.1 ksi) — weaker than 96% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is 1.4598 easy to machine?
Reasonably — machinability is rated good (68/100, better than 98% of stainless steel grades). Excellent for CNC/Swiss turning — run ~1.5–1.8× the speed of 316L with sharp positive geometry, high-pressure coolant and no dwelling to avoid work hardening.
Can 1.4598 be welded?
Not readily — weldability is rated poor (30/100). Not recommended for structural welds: the 0.15–0.35% S causes hot cracking; if unavoidable use low heat input, 316L/309L filler and accept reduced properties.
What surface finishes work on 1.4598?
Passivate per ASTM A967 (citric preferred, as nitric can attack sulphides); electropolishing and mirror polishing give a slightly pitted look — not for cosmetic Class-A surfaces.
Can 1.4598 be formed, bent or molded?
Suitable for turning, knurling, rolling of threads and mild upsetting; avoid deep drawing or tight cold bends because sulphide stringers open as edge cracks.
What is the maximum service temperature of 1.4598?
1.4598 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 1.4598-AT and 1.4598-C900?
AT is the default condition — standard stock condition for hot-rolled/peeled bar and for parts needing maximum corrosion resistance and ductility. C900: highest standard cold-drawn class, for small bar and pins where strength matters more than ductility. Yield strength is 240 MPa in AT versus 620 MPa in C900.
How much does 1.4598 cost?
1.4598 is a premium-cost stainless steel ($$$), cheaper than about 51% 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 10088-1 Stainless steels — List of stainless steels — CEN (2014)
- EN 10088-3 Stainless steels — Semi-finished products, bars, rods, wire, sections — CEN (2014)
- 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)
- Free-machining austenitic stainless bar datasheets (Ugitech/Sandvik/Outokumpu class data) — producers (2023)
- (Mysteel / SMM / 1688 ) — Mysteel, SMM (2025)
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.