Stainless Steel 302-1/8 Hard
Supply condition
AISI/SAE 302 · UNS S30200 · EN 1.4319 · JIS SUS302 · GB 12Cr18Ni9
1/8 Hard = lightly cold rolled strip
Use where annealed strip is too soft for handling but full bendability is still required.
Values for the 1/8 Hard condition
Other 302 tempers and conditions
302 is listed in 10 conditions; see the grade overview at 302.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault solution annealed (1010–1120 °C, rapid cool) | Default stocked condition for sheet, strip, bar and wire that will be deep drawn, bent or coiled. | 275 | 620 | 55 | 150 HB | — |
1/16 Hard | Lightly cold-rolled 302 strip/sheet temper per ASTM A666 (Rp0.2 ≥310 MPa) that keeps most of the annealed ductility for bending and forming. | 380 | 655 | 35 | 190 HB | 2.4 % IACS |
1/8 HardThis page Lightly cold rolled strip | Use where annealed strip is too soft for handling but full bendability is still required. | 380 | 720 | 30 | 11 HRC | 2.4 % IACS |
Quarter hard | Common temper for stamped brackets, clips and washers that still need moderate bending. | 550 | 900 | 12 | 27 HRC | 2.4 % IACS |
1/4 Hard | Cold-rolled 302 quarter-hard temper per ASTM A666 (Rp0.2 ≥515 MPa, Rm ≥860 MPa) for moderately formed springy parts, clips and brackets. | 585 | 900 | 15 | 25 HRC | 2.4 % IACS |
cold drawn bar / wire (as-drawn, ~10–20 % reduction) | Pick for shafts, pins and machined parts needing better straightness, surface finish and roughly double the annealed yield strength. | 690 | 860 | 14 | 24 HRC | — |
Half hard | Higher strength stamping temper for flat springs, shims and structural clips with gentle bend radii only. | 800 | 1,070 | 8 | 32 HRC | 2.4 % IACS |
1/2 Hard | Cold-rolled 302 half-hard temper per ASTM A666 (Rp0.2 ≥760 MPa, Rm ≥1035 MPa) — high-strength springy strip with limited bend ductility. | 830 | 1,080 | 10 | 32 HRC | 2.4 % IACS |
Three-quarter hard | Near-spring temper strip for flat springs and retaining parts formed with generous radii. | 965 | 1,240 | 5 | 37 HRC | 2.4 % IACS |
heavily cold rolled strip (ASTM A666) | Maximum cold-rolled strength for flat springs, blades and shims used essentially flat. | 1,030 | 1,320 | 4 | 41 HRC | 2.4 % IACS |
What is 302-1/8 Hard?
302-1/8 Hard is 302 supplied in the 1/8 Hard condition — use where annealed strip is too soft for handling but full bendability is still required. 302-1/8 Hard has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 193 GPa (28 Msi). 302-1/8 Hard 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). Annealed is the default condition FabDigit quotes; 1/8 Hard is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
- Forms and bends easily — 75/100, better than 87% of stainless steel grades
- Easy to machine — 45/100, better than 84% of stainless steel grades
Limitations
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
- Difficult to weld — 50/100, worse than 77% of stainless steel grades
302-1/8 Hard properties
Typical room-temperature values for 302-1/8 Hard; 24 are specific to this condition. Other listed values are 302 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
302-1/8 Hard 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
302-1/8 Hard has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
302-1/8 Hard is rated for continuous service to 400°C (752 °F). It conducts heat at 16.2 W/m·K (9.36 BTU/hr·ft·°F), better than 64% of stainless steel grades. Thermal expansion is 17.3 µm/m·K (9.61 µin/in·°F).
Electrical3
302-1/8 Hard conducts electricity at 2.4 % IACS, better than 67% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 56% of stainless steel grades.
Sustainability4
Producing a kilogram of 302-1/8 Hard takes about 53 MJ of energy and emits 5.2 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
302-1/8 Hard's machinability is fair (45/100, better than 84% of stainless steel grades); weldability fair (50/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 302-1/8 Hard
Is 302 easy to machine?
Gummy and work-hardening like 304 — use rigid setups, sharp positive-rake carbide, heavy constant feed, 20–35 % lower surface speed than mild steel and flood coolant to avoid glazing.
Can 302 be welded?
GTAW/GMAW/resistance welding are all practical with 308L/347 filler, but the ≤0.15 % C makes the HAZ sensitization-prone: keep heat input low and post-weld solution anneal for corrosive or high-temperature service.
Can 302 be formed, bent or molded?
Excellent deep-draw and spring-coiling behaviour with high work hardening; allow springback and interstage annealing on severe draws, and stress-relieve coiled springs at 260–400 °C.
What surface finishes work on 302?
Not anodizable — passivate per ASTM A967 or electropolish; takes a high mechanical polish (No.4 to mirror) and accepts electroplating with proper Woods-nickel strike.
302 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 |
|---|---|---|
| Chigher than 304 — gives the extra cold-work strength | ≤ 0.15 | 0.1 |
| Cr | 17 – 19 | 18 |
| Ni | 8 – 10 | 9 |
| Mn | ≤ 2 | 1 |
| Si1.00 max in some product specs | ≤ 0.75 | 0.5 |
| N | ≤ 0.1 | 0.05 |
| P | ≤ 0.05 | — |
| S | ≤ 0.03 | — |
| Fe | balance | — |
302-1/8 Hard — frequently asked
What is 302-1/8 Hard used for?
302-1/8 Hard is typically used for springs, kitchen sinks and cookware. In short: general-purpose austenitic bar.
What is the yield strength of 302-1/8 Hard?
302-1/8 Hard has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 52% of stainless steel grades. Strength varies by condition: see the 10 listed tempers.
Is 302-1/8 Hard easy to machine?
Reasonably — machinability is rated fair (45/100, better than 84% of stainless steel grades). Gummy and work-hardening like 304 — use rigid setups, sharp positive-rake carbide, heavy constant feed, 20–35 % lower surface speed than mild steel and flood coolant to avoid glazing.
Can 302-1/8 Hard be welded?
With care — weldability is rated fair (50/100). GTAW/GMAW/resistance welding are all practical with 308L/347 filler, but the ≤0.15 % C makes the HAZ sensitization-prone: keep heat input low and post-weld solution anneal for corrosive or high-temperature service.
What surface finishes work on 302-1/8 Hard?
Not anodizable — passivate per ASTM A967 or electropolish; takes a high mechanical polish (No.4 to mirror) and accepts electroplating with proper Woods-nickel strike.
Can 302-1/8 Hard be formed, bent or molded?
Excellent deep-draw and spring-coiling behaviour with high work hardening; allow springback and interstage annealing on severe draws, and stress-relieve coiled springs at 260–400 °C.
What is the maximum service temperature of 302-1/8 Hard?
302-1/8 Hard 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.
Can FabDigit make parts in 302-1/8 Hard?
Yes — 302-1/8 Hard is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A666 — Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate and Flat Bar — ASTM International (2015)
- ASTM A276/A276M — Stainless Steel Bars and Shapes — ASTM International (2023)
- ASTM A313/A313M — Stainless Steel Spring Wire — ASTM International (2018)
- EN 10088-3 (X10CrNi18-8, 1.4319) — CEN (2014)
- JIS G 4313 / G 4303 (SUS302) — JSA (2011)
- GB/T 1220 (12Cr18Ni9) — SAC (2007)
- 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)
- Machinery's Handbook, 31st ed. (machinability ratings) — Industrial Press (2020)
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.