Stainless Steel 1.4335
EN 1.4335
1.4335 (X1CrNi25-21) is an ultra-low-carbon, high-chromium high-nickel austenitic stainless comparable to 310S / S31008, with the 25Cr-21Ni balance giving oxidation resistance to about 1050 °C.
Reference datasheet — 1.4335 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
1.4335 tempers and conditions
1.4335 is supplied in 8 conditions, soft to hard. AT is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot Rolled Plate, annealed and pickled | Thick-section plate (≥3 mm) for furnace retorts, muffles and radiant tubes; matt pickled surface. | 260 | 560 | 45 | 155 HB | 2 % IACS |
ATDefault Solution Annealed | Standard stocked condition for plate, sheet, bar and tube in high-temperature and welded service. | 270 | 580 | 48 | 150 HB | — |
Cold Rolled Sheet, annealed and pickled | Thin sheet for fabricated furnace liners, baskets and ducting where a smooth mill finish is wanted. | 280 | 600 | 45 | 160 HB | 2 % IACS |
As-welded deposit | Use to describe fabricated weldments — ultra-low carbon avoids sensitisation so no PWHT is needed. | 320 | 560 | 35 | 165 HB | 2 % IACS |
Cold drawn | Choose when tighter tolerance, better surface and higher yield strength than annealed bar are required. | 450 | 700 | 30 | 17 HRC | 2 % IACS |
Quarter hard | Light temper rolled strip where extra stiffness/spring-back is needed but forming is still required. | 500 | 750 | 22 | 20 HRC | 2 % IACS |
Half hard | Higher strength strip for clips, straps and lightly formed structural parts; limited bend radius. | 650 | 900 | 12 | 28 HRC | 2 % IACS |
Full hard | Maximum-strength flat-rolled or drawn product for springs and shims; essentially no further forming. | 900 | 1,100 | 6 | 35 HRC | 2 % IACS |
Supply forms, finishes and certifications
Ways 1.4335 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
HF-BAR | Hot Finished / Forged Bar, solution annealed | Supply form |
2R | Bright Annealed sheet/tube | Surface finish |
What is 1.4335?
1.4335 (X1CrNi25-21) is an ultra-low-carbon, high-chromium high-nickel austenitic stainless comparable to 310S / S31008, with the 25Cr-21Ni balance giving oxidation resistance to about 1050 °C. Engineers specify it for furnace and heat-recovery hardware because the very low carbon avoids carbide precipitation, so no post-weld solution anneal is needed (weldability score 82); it is stocked as AT plate, HR-1D, CR-2B, 2R, hot-finished bar, cold drawn and 1/4H to FH. Typical annealed values are 270 MPa yield, 580 MPa tensile, 48 % elongation and 150 HB (80 HRB), with a formability score of 72. Cost is high because of the nickel content, and sigma-phase embrittlement can occur on long holds in the intermediate temperature range; 309S-type grades are the cheaper option at lower temperature. 1.4335 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). 1.4335 has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 580 MPa (84.1 ksi) — weaker than 79% of stainless steel grades. Elongation at break is 48% and the elastic modulus is 196 GPa (28.4 Msi).
What is 1.4335 used for?
- furnace components
- heat exchangers
- high-temperature fasteners
- kiln linings
Advantages
- High service temperature — 1,050°C (1,922 °F), better than 91% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
- Ductile — tolerates forming and impact — 48%, better than 85% of stainless steel grades
- Readily welded — 82/100, better than 84% of stainless steel grades
- Forms and bends easily — 72/100, better than 84% of stainless steel grades
Limitations
- High embodied carbon — 5.8 kg CO₂/kg, worse than 86% of stainless steel grades
- Low strength — 270 MPa (39.2 ksi), worse than 79% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
1.4335 properties
Typical room-temperature values for 1.4335-AT; bars are the position among stainless steel grades.
Physical3
1.4335 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
1.4335 has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 580 MPa (84.1 ksi) — weaker than 79% of stainless steel grades. Elongation at break is 48% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
1.4335 is rated for continuous service to 1,050°C (1,922 °F). It conducts heat at 14.5 W/m·K (8.38 BTU/hr·ft·°F), worse than 72% of stainless steel grades. Thermal expansion is 15.5 µm/m·K (8.61 µin/in·°F).
Electrical3
1.4335 conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4335 takes about 70 MJ of energy and emits 5.8 kg of CO₂ — more than 81% of stainless steel grades. Typical recycled content is 65%.
Manufacturability8
1.4335's machinability is poor (33/100, worse than 57% of stainless steel grades); weldability very good (82/100); formability very good (72/100).
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. 1.4335 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4335
Is 1.4335 easy to machine?
Gummy and strongly work hardening — use rigid setups, positive-rake carbide, heavy positive feed, 15–25 m/min for HSS drilling and flood coolant to avoid glazing the cut.
Can 1.4335 be welded?
Excellent weldability by GTAW/GMAW/SMAW with matching 25/20 low-carbon filler (ER310L / E310-15); keep interpass ≤150 °C and heat input low to limit hot cracking and σ-phase, no post-weld solution anneal required.
Can 1.4335 be formed, bent or molded?
Cold forms well but needs ~50% more press force than 304 due to high work-hardening; hot work 1150–1200 °C and always finish above 950 °C, then solution anneal 1050–1120 °C with rapid cooling.
1.4335 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 |
|---|---|---|
| Cultra-low carbon, prevents sensitisation | ≤ 0.02 | 0.02 |
| Si | ≤ 0.25 | 0.2 |
| Mn | ≤ 2 | 1.5 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.01 | 0 |
| Cr | 24 – 26 | 25 |
| Ni | 20 – 22 | 21 |
| N | ≤ 0.11 | 0.06 |
| Fe | balance |
What surface finishes work on 1.4335?
Pickle/passivate per ASTM A967 after hot work or welding; electropolish or mechanical polish for clean surfaces — no anodising, and avoid carbon-steel tooling contamination.
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 1.4335 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X1CrNi25-21
- Similar grades
- 310SS31008
How much does 1.4335 cost?
1.4335 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.
1.4335 — frequently asked
What is 1.4335 used for?
1.4335 is typically used for furnace components, heat exchangers, high-temperature fasteners and kiln linings. In short: highest-temperature austenitic here; no post-weld anneal needed; high-nickel, high cost.
What is the yield strength of 1.4335?
1.4335 has a typical yield strength of 270 MPa (39.2 ksi) and a tensile strength of 580 MPa (84.1 ksi) — weaker than 79% of stainless steel grades. Strength varies by condition: see the 8 listed tempers.
Is 1.4335 easy to machine?
Not especially — machinability is rated poor (33/100, worse than 57% of stainless steel grades). Gummy and strongly work hardening — use rigid setups, positive-rake carbide, heavy positive feed, 15–25 m/min for HSS drilling and flood coolant to avoid glazing the cut.
Can 1.4335 be welded?
Yes — weldability is rated very good (82/100). Excellent weldability by GTAW/GMAW/SMAW with matching 25/20 low-carbon filler (ER310L / E310-15); keep interpass ≤150 °C and heat input low to limit hot cracking and σ-phase, no post-weld solution anneal required.
What surface finishes work on 1.4335?
Pickle/passivate per ASTM A967 after hot work or welding; electropolish or mechanical polish for clean surfaces — no anodising, and avoid carbon-steel tooling contamination.
Can 1.4335 be formed, bent or molded?
Cold forms well but needs ~50% more press force than 304 due to high work-hardening; hot work 1150–1200 °C and always finish above 950 °C, then solution anneal 1050–1120 °C with rapid cooling.
What is the maximum service temperature of 1.4335?
1.4335 is rated for continuous use to about 1,050°C (1,922 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4335-AT and 1.4335-FH?
AT is the default condition — standard stocked condition for plate, sheet, bar and tube in high-temperature and welded service. FH: maximum-strength flat-rolled or drawn product for springs and shims; essentially no further forming. Yield strength is 270 MPa in AT versus 900 MPa in FH.
How much does 1.4335 cost?
1.4335 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/-2/-3 Stainless steels — grades, sheet/plate and bar — CEN (2014)
- ASTM A240/A240M — Cr and Cr-Ni stainless plate, sheet and strip (S31008/S31003) — ASTM (2023)
- 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)
- 310S/310L high-temperature austenitic stainless datasheets — Outokumpu / Sandvik (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.