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Stainless Steel 1.4318-FH (Full hard)

Supply condition

EN 1.4318 · UNS S30153 · AISI/SAE 301LN · JIS SUS301LN · GB 022Cr17Ni7N

US-spec full-hard sheet/strip for springs, shims and blanked flat parts.

Standard cost $$
Request a quote in 1.4318-FH1.4318 overview

Values for the FH 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 datasheetBest forYield MPaTensile MPaElong. %HardnessConductivity
C700
cold rolled temper, Rm 700–850 MPa
Lightly temper-rolled strip when a modest strength gain must be kept with good bendability.4707804521 HRC2.4 % IACS
1/4H
Quarter hard
US-spec quarter-hard strip/sheet when ordering to ASTM A666 rather than EN tempers.6209003227 HRC2.4 % IACS
C850
cold rolled temper, Rm 850–1000 MPa
Mid-strength temper for roll-formed profiles and lightweight welded panels.6409103528 HRC2.4 % IACS
1/2H
Half hard
US-spec half-hard sheet for structural panels and brackets with moderate bending.8401,0802433 HRC2.4 % IACS
C1000
cold rolled temper, Rm 1000–1150 MPa
Classic rail-car / bus body temper: high strength with still-weldable low-carbon chemistry.8601,0602633 HRC2.4 % IACS
3/4H
Three-quarter hard
US-spec three-quarter-hard strip for high-load flat parts with limited forming.9801,2001637 HRC2.4 % IACS
C1150
cold rolled temper, Rm 1150–1300 MPa
High-strength strip for weight-critical profiles and lightly formed spring-type parts.1,0101,2101837 HRC2.4 % IACS
FHThis page
Full hard
US-spec full-hard sheet/strip for springs, shims and blanked flat parts.1,1501,3501142 HRC2.4 % IACS
C1300
cold rolled temper, Rm 1300–1500 MPa
Maximum-strength strip temper for flat springs, clamps and highly loaded thin sections.1,1801,3601242 HRC2.5 % IACS

What is 1.4318-FH?

1.4318-FH is 1.4318 supplied in the FH condition — uS-spec full-hard sheet/strip for springs, shims and blanked flat parts. 1.4318-FH has a yield strength of 1,150 MPa (167 ksi) and a tensile strength of 1,350 MPa (196 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 11% and the elastic modulus is 190 GPa (27.6 Msi). 1.4318-FH 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 — 1,150 MPa (167 ksi), better than 98% of stainless steel grades

Limitations

  • Limited service temperature — 250°C (482 °F), worse than 99% of stainless steel grades
  • Limited ductility — 11%, worse than 96% of stainless steel grades
  • Limited formability — 22/100, worse than 82% of stainless steel grades
  • Low fracture toughness — 80 MPa·√m (72.8 ksi·√in), worse than 79% of stainless steel grades
  • Needs corrosion protection — 50/100, worse than 78% of stainless steel grades

1.4318-FH properties

Typical room-temperature values for 1.4318-FH; 23 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-FH 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).

Density7.9 g/cm³0.29 lb/in³
Melting Point (Solidus)1,400°C2,552 °F
Liquidus Temperature1,450°C2,642 °F

Mechanical15

1.4318-FH has a yield strength of 1,150 MPa (167 ksi) and a tensile strength of 1,350 MPa (196 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 11% and the elastic modulus is 190 GPa (27.6 Msi).

Elastic (Young's) Modulus190 GPa27.6 Msi
Shear Modulus78 GPa11.3 Msi
Bulk Modulus150 GPa21.8 Msi
Poisson's Ratio0.29
Tensile Strength (Ultimate)1,350 MPa196 ksi
Yield Strength (0.2% offset)1,150 MPa167 ksi
Elongation at Break11%
Reduction in Area38%
Shear Strength800 MPa116 ksi
Fatigue Strength (Endurance Limit)520 MPa75.4 ksi
Fracture Toughness (K_IC)80 MPa·√m72.8 ksi·√in
Charpy V-Notch Impact (RT)35 J25.8 ft·lbf
Hardness, Brinell390 HB
Hardness, Rockwell B88 HRB
Hardness, Vickers420 HV

Thermal6

1.4318-FH is rated for continuous service to 250°C (482 °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).

Thermal Conductivity15 W/m·K8.7 BTU/hr·ft·°F
Specific Heat Capacity500 J/kg·K0.12 BTU/lb·°F
Thermal Expansion (CTE, 20–100 °C)16 µm/m·K8.9 µin/in·°F
Latent Heat of Fusion270 J/g116 BTU/lb
Max Service Temperature (continuous)250°C482 °F
Min Service Temperature-196°C-321 °F

Electrical3

1.4318-FH conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.

Electrical Conductivity2.4 % IACS
Electrical Resistivity7.3×10⁻⁷ Ω·m28.7 µΩ·in
Magnetic Responseferromagnetic

Chemical & Environmental3

Corrosion resistance is fair (50/100), worse than 78% of stainless steel grades.

Galvanic Potential (seawater, vs SCE)-0.05 V
Corrosion ResistanceFair50/100
Chemical Resistance SummaryGood in atmospheric, mildly acidic and organic media; comparable to but slightly below 304 in oxidising acids; not suitable for chlorides, seawater or reducing acids (no Mo); low carbon + N gives good resistance to weld-zone sensitisation.

Sustainability4

Producing a kilogram of 1.4318-FH 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%.

Embodied Energy (primary production)55 MJ/kg23,646 BTU/lb
Embodied Carbon (primary production)4.8 kg CO₂/kg
Embodied Water130 L/kg15.6 gal/lb
Typical Recycled Content60%

Manufacturability7

1.4318-FH's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability very good (70/100); formability poor (22/100).

MachinabilityPoor32/100
Machinability Rating (AISI 1212 = 100 %)30%
WeldabilityVery good70/100
Formability (cold)Poor22/100
Brazeability / SolderabilityVery good70/100
PolishabilityVery good75/100
Anodizing Responsen/a — stainless steel is not anodised; use pickling/passivation or electropolishing instead

Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.

Working with 1.4318-FH

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.

ElementSpec limit (wt %)Nominal
Clow carbon for weld-zone corrosion resistance≤ 0.030.02
Si≤ 10.5
Mn≤ 21.3
P≤ 0.05—
S≤ 0.02—
Cr16.5 – 18.517.5
Nilow Ni gives metastable austenite6 – 86.8
Nsolid-solution strengthening + austenite stabiliser0.1 – 0.20.15
Febalance—

1.4318-FH — frequently asked

What is 1.4318-FH used for?

1.4318-FH 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-FH?

1.4318-FH has a typical yield strength of 1,150 MPa (167 ksi) and a tensile strength of 1,350 MPa (196 ksi) — stronger than 98% of stainless steel grades. Strength varies by condition: see the 9 listed tempers.

Is 1.4318-FH easy to machine?

Not especially — machinability is rated poor (32/100, worse than 62% 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-FH be welded?

Yes — weldability is rated very good (70/100). 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-FH?

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-FH 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-FH?

1.4318-FH is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.

Sources

  1. EN 10088-1/-2 Stainless steels — technical delivery conditions for sheet/plate and strip — CEN (2014)
  2. EN 10151 Stainless steel strip for springs — CEN (2002)
  3. ASTM A666 Standard Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate and Flat Bar — ASTM International (2015)
  4. GB/T 3280 (022Cr17Ni7N) — SAC (2015)
  5. Core 301LN/4318 cold rolled strip data — Outokumpu (2023)
  6. 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.