Stainless Steel 1.4318 1/4H
Supply condition
EN 1.4318 · UNS S30153 · AISI/SAE 301LN · JIS SUS301LN · GB 022Cr17Ni7N
1/4H = quarter hard
US-spec quarter-hard strip/sheet when ordering to ASTM A666 rather than EN tempers.
Values for the 1/4H condition
Other 1.4318 tempers and conditions
1.4318 is listed in 9 conditions; see the grade overview at 1.4318.
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 |
1/4HThis page 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 |
What is 1.4318 1/4H?
1.4318 1/4H is 1.4318 supplied in the 1/4H condition — uS-spec quarter-hard strip/sheet when ordering to ASTM A666 rather than EN tempers. 1.4318 1/4H has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 195 GPa (28.3 Msi). 1.4318 1/4H 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).
Advantages
- High strength — 620 MPa (89.9 ksi), better than 88% of stainless steel grades
- Easy to machine — 45/100, better than 84% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
1.4318 1/4H properties
Typical room-temperature values for 1.4318 1/4H; 24 are specific to this condition. Other listed values are 1.4318 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
1.4318 1/4H 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 1/4H has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
1.4318 1/4H is rated for continuous service to 300°C (572 °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 1/4H conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (53/100), worse than 75% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4318 1/4H 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 1/4H's machinability is fair (45/100, better than 84% of stainless steel grades); weldability very good (78/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 1.4318 1/4H
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.
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.
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 | — |
1.4318 1/4H — frequently asked
What is 1.4318 1/4H used for?
1.4318 1/4H 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 1/4H?
1.4318 1/4H has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 88% of stainless steel grades. Strength varies by condition: see the 9 listed tempers.
Is 1.4318 1/4H easy to machine?
Reasonably — machinability is rated fair (45/100, better than 84% 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 1/4H be welded?
Yes — weldability is rated very good (78/100). 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 1/4H?
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 1/4H 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 1/4H?
1.4318 1/4H is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.