Stainless Steel 1.4361
EN 1.4361
A high-silicon, low-carbon austenitic stainless steel developed for excellent resistance to concentrated boiling nitric acid; engineers select it for chemical plant equipment handling strong oxidizing acids.
Reference datasheet — 1.4361 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 A condition
1.4361 tempers and conditions
1.4361 is supplied in 5 conditions, soft to hard. A is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ADefault Solution annealed | Standard supply condition for all product forms; maximum corrosion resistance in nitric acid service. | 275 | 620 | 45 | 165 HB | — |
As-welded deposit | Reference condition for weldments; use matching high-Si filler and low heat input, solution anneal where the service acid is most aggressive. | 300 | 600 | 30 | 180 HB | 1.9 % IACS |
Cold drawn | Choose for close-tolerance bar, pump shafts and small-bore tubing where higher strength is needed. | 470 | 720 | 28 | 17 HRC | 1.9 % IACS |
1/4 Hard | Light temper for springy clips and stiffer thin sections; corrosion performance unchanged but residual stress raises SCC caution. | 520 | 760 | 22 | 21 HRC | 1.9 % IACS |
1/2 Hard | Higher-strength strip temper for flat springs and shims; limited bending, stress relief recommended before acid service. | 650 | 900 | 14 | 28 HRC | 1.9 % IACS |
Supply forms, finishes and certifications
Ways 1.4361 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
1D | Hot rolled, annealed, pickled plate | Surface finish |
2B | Cold rolled, annealed, pickled, skin-passed sheet/strip | Surface finish |
What is 1.4361?
A high-silicon, low-carbon austenitic stainless steel developed for excellent resistance to concentrated boiling nitric acid; engineers select it for chemical plant equipment handling strong oxidizing acids. 1.4361 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,370°C (2,498 °F). 1.4361 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 77% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
What is 1.4361 used for?
- nitric acid production vessels
- chemical process piping
- heat exchangers in acid service
- fertilizer plant equipment
Advantages
- Good corrosion resistance — 80/100, better than 88% of stainless steel grades
- High service temperature — 850°C (1,562 °F), better than 80% of stainless steel grades
- Forms and bends easily — 70/100, better than 79% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
- Low strength — 275 MPa (39.9 ksi), worse than 77% of stainless steel grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 77% of stainless steel grades
1.4361 properties
Typical room-temperature values for 1.4361-A; bars are the position among stainless steel grades.
Physical3
1.4361 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical14
1.4361 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 77% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
1.4361 is rated for continuous service to 850°C (1,562 °F). It conducts heat at 13.5 W/m·K (7.8 BTU/hr·ft·°F), worse than 83% of stainless steel grades. Thermal expansion is 16 µm/m·K (8.89 µin/in·°F).
Electrical3
1.4361 conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 88% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4361 takes about 65 MJ of energy and emits 5.5 kg of CO₂ — more than 79% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
1.4361's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability good (65/100); formability very good (70/100).
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. 1.4361 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4361
Is 1.4361 easy to machine?
Machines like a tough austenitic but with added abrasion from ~4 % Si — use sharp positive-rake carbide, rigid setups, heavy flood coolant, low speeds and positive feed to avoid work-hardened glazing.
Can 1.4361 be welded?
GTAW/GMAW/SMAW with matching high-Si S30600-type or over-alloyed filler; keep heat input low, interpass below ~150 °C, no preheat, and back-purge — hot-cracking sensitivity is higher than 304L.
Can 1.4361 be formed, bent or molded?
Cold forms and deep draws reasonably well but work-hardens faster than 304L; hot work 1150–900 °C followed by solution anneal at 1050–1120 °C with rapid quench.
1.4361 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 to avoid sensitisation | ≤ 0.02 | 0.01 |
| Sikey alloying element for nitric-acid passivity | 3.7 – 4.3 | 4 |
| Mn | ≤ 2 | 0.7 |
| P | ≤ 0.03 | 0.02 |
| Slow S for hot workability and acid resistance | ≤ 0.01 | 0 |
| Cr | 17 – 18.5 | 17.8 |
| Nistabilises austenite against high Si | 14 – 15.5 | 14.8 |
| Moresidual only | ≤ 0.2 | 0.1 |
| Nrestricted | ≤ 0.05 | 0.02 |
| Fe | balance |
What surface finishes work on 1.4361?
Pickle and passivate (HNO3-based) or electropolish after fabrication to restore the Si-rich passive film; not anodisable, and mechanical grinding should be followed by pickling before acid service.
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 1.4361 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X1CrNiSi18-15-4
How much does 1.4361 cost?
1.4361 is a high-cost stainless steel ($$$$), pricier than about 78% 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.
1.4361 — frequently asked
What is 1.4361 used for?
1.4361 is typically used for nitric acid production vessels, chemical process piping, heat exchangers in acid service and fertilizer plant equipment. In short: nitric-acid specialist stainless; high-silicon austenitic grade; outperforms 304L in oxidizers.
What is the yield strength of 1.4361?
1.4361 has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 77% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4361 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% of stainless steel grades). Machines like a tough austenitic but with added abrasion from ~4 % Si — use sharp positive-rake carbide, rigid setups, heavy flood coolant, low speeds and positive feed to avoid work-hardened glazing.
Can 1.4361 be welded?
Yes — weldability is rated good (65/100). GTAW/GMAW/SMAW with matching high-Si S30600-type or over-alloyed filler; keep heat input low, interpass below ~150 °C, no preheat, and back-purge — hot-cracking sensitivity is higher than 304L.
What surface finishes work on 1.4361?
Pickle and passivate (HNO3-based) or electropolish after fabrication to restore the Si-rich passive film; not anodisable, and mechanical grinding should be followed by pickling before acid service.
Can 1.4361 be formed, bent or molded?
Cold forms and deep draws reasonably well but work-hardens faster than 304L; hot work 1150–900 °C followed by solution anneal at 1050–1120 °C with rapid quench.
What is the maximum service temperature of 1.4361?
1.4361 is rated for continuous use to about 850°C (1,562 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4361-A and 1.4361-C850?
A is the default condition — standard supply condition for all product forms; maximum corrosion resistance in nitric acid service. C850: higher-strength strip temper for flat springs and shims; limited bending, stress relief recommended before acid service. Yield strength is 275 MPa in A versus 650 MPa in C850.
How much does 1.4361 cost?
1.4361 is a high-cost stainless steel ($$$$), pricier than about 78% 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 — grade X1CrNiSi18-15-4 (1.4361) — CEN (2014)
- ASTM A240/A240M — UNS S30600 plate, sheet and strip — ASTM International (2023)
- ASTM A276 / A312 — bar and welded/seamless pipe, austenitic grades — ASTM International (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)
- High-silicon austenitic stainless steel for nitric acid service (S30600-type) datasheets — Various stainless producers (2022)
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.