Stainless Steel 1.4318
EN 1.4318 · UNS S30153 · AISI/SAE 301LN · JIS SUS301LN · GB 022Cr17Ni7N
Low-carbon, nitrogen-alloyed metastable austenitic stainless combining good weldability with high work-hardening capability, used where 301-type strength is needed with better corrosion resistance than standard 301.
Reference datasheet — 1.4318 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.
1.4318 tempers and conditions
1.4318 is supplied in 9 conditions, soft to hard.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
cold rolled temper, Rm 700–850 MPa | Lightly temper-rolled strip when a modest strength gain must be kept with good bendability. | 470 | 780 | 45 | 21 HRC | 2.4 % IACS |
Quarter hard | US-spec quarter-hard strip/sheet when ordering to ASTM A666 rather than EN tempers. | 620 | 900 | 32 | 27 HRC | 2.4 % IACS |
cold rolled temper, Rm 850–1000 MPa | Mid-strength temper for roll-formed profiles and lightweight welded panels. | 640 | 910 | 35 | 28 HRC | 2.4 % IACS |
Half hard | US-spec half-hard sheet for structural panels and brackets with moderate bending. | 840 | 1,080 | 24 | 33 HRC | 2.4 % IACS |
cold rolled temper, Rm 1000–1150 MPa | Classic rail-car / bus body temper: high strength with still-weldable low-carbon chemistry. | 860 | 1,060 | 26 | 33 HRC | 2.4 % IACS |
Three-quarter hard | US-spec three-quarter-hard strip for high-load flat parts with limited forming. | 980 | 1,200 | 16 | 37 HRC | 2.4 % IACS |
cold rolled temper, Rm 1150–1300 MPa | High-strength strip for weight-critical profiles and lightly formed spring-type parts. | 1,010 | 1,210 | 18 | 37 HRC | 2.4 % IACS |
Full hard | US-spec full-hard sheet/strip for springs, shims and blanked flat parts. | 1,150 | 1,350 | 11 | 42 HRC | 2.4 % IACS |
cold rolled temper, Rm 1300–1500 MPa | Maximum-strength strip temper for flat springs, clamps and highly loaded thin sections. | 1,180 | 1,360 | 12 | 42 HRC | 2.5 % IACS |
Supply forms, finishes and certifications
Ways 1.4318 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, solution annealed and pickled plate/sheet | Surface finish |
2BDefault | 2B / +AT | Surface finish |
What is 1.4318?
Low-carbon, nitrogen-alloyed metastable austenitic stainless combining good weldability with high work-hardening capability, used where 301-type strength is needed with better corrosion resistance than standard 301. 1.4318 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). 1.4318 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 750 MPa (109 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 50% and the elastic modulus is 200 GPa (29 Msi).
What is 1.4318 used for?
- railway car bodies
- structural cold-formed components
- automotive structural parts
- springs requiring weldability
Advantages
- Forms and bends easily — 88/100, better than 97% of stainless steel grades
- Ductile — tolerates forming and impact — 50%, better than 90% of stainless steel grades
- Readily welded — 85/100, better than 87% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
Limitations
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
1.4318 properties
Typical room-temperature values; bars are the position among stainless steel grades.
Physical3
1.4318 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).
Mechanical15
1.4318 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 750 MPa (109 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 50% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4318 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 µm/m·K (8.89 µin/in·°F).
Electrical3
1.4318 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 1.4318 takes about 55 MJ of energy and emits 4.8 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
1.4318's machinability is fair (42/100, better than 79% of stainless steel grades); weldability excellent (85/100); formability excellent (88/100).
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. 1.4318 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4318
Is 1.4318 easy to machine?
Work-hardens rapidly like 301/304 — use rigid setups, sharp positive-rake carbide, heavy positive feeds and flood coolant, avoid dwelling; ~45 % of AISI 1212.
Can 1.4318 be welded?
Readily welded by GTAW/GMAW/laser/resistance methods without post-weld anneal thanks to <0.03 % C and N; use 308L/309L or matching filler, keep heat input low to limit distortion and strength loss in cold-worked tempers.
Can 1.4318 be formed, bent or molded?
Excellent deep-drawing and stretch forming in 2B (high n-value); expect strong strain hardening, springback and induced magnetism — allow extra press tonnage and consider inter-stage annealing for severe draws.
1.4318 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 for weld-zone corrosion resistance | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.5 |
| Mn | ≤ 2 | 1.3 |
| P | ≤ 0.05 | |
| S | ≤ 0.02 | |
| Cr | 16.5 – 18.5 | 17.5 |
| Nilow Ni gives metastable austenite | 6 – 8 | 6.8 |
| Nsolid-solution strengthening + austenite stabiliser | 0.1 – 0.2 | 0.15 |
| Fe | balance |
What surface finishes work on 1.4318?
Pickle and passivate after welding to restore the passive film; electropolishing and mechanical polishing to BA/No.4/No.8 finishes work well — do not anodise.
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 1.4318 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
How much does 1.4318 cost?
1.4318 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.
1.4318 — frequently asked
What is 1.4318 used for?
1.4318 is typically used for railway car bodies, structural cold-formed components, automotive structural parts and springs requiring weldability. In short: weldable high-strength 301; cold-rolls to C1300 temper; better corrosion than 301.
What is the yield strength of 1.4318?
1.4318 has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 750 MPa (109 ksi) — stronger than 52% of stainless steel grades. Strength varies by condition: see the 9 listed tempers.
Is 1.4318 easy to machine?
Not especially — machinability is rated fair (42/100, better than 79% of stainless steel grades). Work-hardens rapidly like 301/304 — use rigid setups, sharp positive-rake carbide, heavy positive feeds and flood coolant, avoid dwelling; ~45 % of AISI 1212.
Can 1.4318 be welded?
Yes — weldability is rated excellent (85/100). Readily welded by GTAW/GMAW/laser/resistance methods without post-weld anneal thanks to <0.03 % C and N; use 308L/309L or matching filler, keep heat input low to limit distortion and strength loss in cold-worked tempers.
What surface finishes work on 1.4318?
Pickle and passivate after welding to restore the passive film; electropolishing and mechanical polishing to BA/No.4/No.8 finishes work well — do not anodise.
Can 1.4318 be formed, bent or molded?
Excellent deep-drawing and stretch forming in 2B (high n-value); expect strong strain hardening, springback and induced magnetism — allow extra press tonnage and consider inter-stage annealing for severe draws.
What is the maximum service temperature of 1.4318?
1.4318 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.
How much does 1.4318 cost?
1.4318 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 10088-1/-2 Stainless steels — technical delivery conditions for sheet/plate and strip — CEN (2014)
- EN 10151 Stainless steel strip for springs — CEN (2002)
- ASTM A666 Standard Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate and Flat Bar — ASTM International (2015)
- GB/T 3280 (022Cr17Ni7N) — SAC (2015)
- Core 301LN/4318 cold rolled strip data — Outokumpu (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
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.