ISO 9328-7
Stainless steel flat products for pressure service, with chemical and room-temperature mechanical requirements.
Stainless steel for pressure purposes
Stainless steel flat products for pressure service, with chemical and room-temperature mechanical requirements.
Data edition: ISO 9328-7:2018
Material requirements. Defined by product form.
Stainless steel flat products for pressure service, with chemical and room-temperature mechanical requirements.
Tables 3 and 4 define cast chemistry; Tables 9 and 10 define the displayed solution-annealed tensile properties. Duplex references share the ISO 4462 designation. Narrow-strip longitudinal proof strength is 15 MPa lower than the transverse values shown.
Find your material grade
12 material references with ISO 9328-7 data.
ISO 9328-7 properties
Select a table to compare requirements.
| Grade / designation | C | Si | Mn | P | S | Cr | Ni | Mo | N | Other elements |
|---|---|---|---|---|---|---|---|---|---|---|
| SS304 4301-304-00-I | ≤0.07 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.015 | 17.5–19.5 | 8.0–10.5 | — | ≤0.10 | — |
| SS304L 4307-304-03-I | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.015 | 17.5–19.5 | 8.0–10.5 | — | ≤0.10 | — |
| SS316 4401-316-00-I | ≤0.07 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.015 | 16.5–18.5 | 10.0–13.0 | 2.00–2.50 | ≤0.10 | — |
| SS316L 4404-316-03-I | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.015 | 16.5–18.5 | 10.0–13.0 | 2.00–2.50 | ≤0.10 | — |
| SS317L 4438-317-03-I | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.015 | 17.5–19.5 | 13.0–16.0 | 3.0–4.0 | ≤0.10 | — |
| SS321 4541-321-00-I | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.015 | 17.0–19.0 | 9.0–12.0 | — | — | Ti: 5 × C to 0.70 |
| SS347 4550-347-00-I | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.015 | 17.0–19.0 | 9.0–12.0 | — | — | Nb: 10 × C to 1.00 |
| SS904L 4539-089-04-I | ≤0.020 | ≤0.70 | ≤2.00 | ≤0.030 | ≤0.010 | 19.0–21.0 | 24.0–26.0 | 4.0–5.0 | ≤0.15 | Cu: 1.20–2.00 |
| 254 SMO 4547-312-54-I | ≤0.020 | ≤0.70 | ≤1.00 | ≤0.030 | ≤0.010 | 19.5–20.5 | 17.5–18.5 | 6.0–7.0 | 0.18–0.25 | Cu: 0.50–1.00 |
| Duplex 2205 4462-318-03-I | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.015 | 21.0–23.0 | 4.5–6.5 | 2.50–3.50 | 0.10–0.22 | — |
| Duplex S31803 4462-318-03-I | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.015 | 21.0–23.0 | 4.5–6.5 | 2.50–3.50 | 0.10–0.22 | — |
| Super Duplex 2507 4410-327-50-E | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.015 | 24.0–26.0 | 6.0–8.0 | 3.0–4.5 | 0.24–0.35 | — |
Composition in mass %. ≤ denotes a maximum; ≥ denotes a minimum; paired values are ranges. — means no numerical limit is provided in the cited data, not zero.
| Grade / designation | Form | Thickness (mm) | Condition | Test direction | Rp0.2 (MPa) | Rp1.0 min (MPa) | Rm (MPa) | A80 min (%) | A min (%) | Other requirements |
|---|---|---|---|---|---|---|---|---|---|---|
| SS304 4301-304-00-I | Cold-rolled strip | ≤8 | +AT | Transverse | 230 | 260 | 540–750 | 45 | 45 | — |
| SS304 4301-304-00-I | Hot-rolled strip | ≤13.5 | +AT | Transverse | 210 | 250 | 520–720 | 45 | 45 | — |
| SS304 4301-304-00-I | Hot-rolled plate | ≤75 | +AT | Transverse | 210 | 250 | 520–720 | 45 | 45 | — |
| SS304L 4307-304-03-I | Cold-rolled strip | ≤8 | +AT | Transverse | 220 | 250 | 520–700 | 45 | 45 | — |
| SS304L 4307-304-03-I | Hot-rolled strip | ≤13.5 | +AT | Transverse | 200 | 240 | 520–700 | 45 | 45 | — |
| SS304L 4307-304-03-I | Hot-rolled plate | ≤75 | +AT | Transverse | 200 | 240 | 500–700 | 45 | 45 | — |
| SS316 4401-316-00-I | Cold-rolled strip | ≤8 | +AT | Transverse | 240 | 270 | 530–680 | 40 | 40 | — |
| SS316 4401-316-00-I | Hot-rolled strip | ≤13.5 | +AT | Transverse | 220 | 260 | 530–680 | 40 | 40 | — |
| SS316 4401-316-00-I | Hot-rolled plate | ≤75 | +AT | Transverse | 220 | 260 | 520–670 | 45 | 45 | — |
| SS316L 4404-316-03-I | Cold-rolled strip | ≤8 | +AT | Transverse | 240 | 270 | 530–680 | 40 | 40 | — |
| SS316L 4404-316-03-I | Hot-rolled strip | ≤13.5 | +AT | Transverse | 220 | 260 | 530–680 | 40 | 40 | — |
| SS316L 4404-316-03-I | Hot-rolled plate | ≤75 | +AT | Transverse | 220 | 260 | 520–670 | 45 | 45 | — |
| SS317L 4438-317-03-I | Cold-rolled strip | ≤8 | +AT | Transverse | 240 | 270 | 550–700 | 35 | 35 | — |
| SS317L 4438-317-03-I | Hot-rolled strip | ≤13.5 | +AT | Transverse | 220 | 260 | 550–700 | 35 | 35 | — |
| SS317L 4438-317-03-I | Hot-rolled plate | ≤75 | +AT | Transverse | 220 | 260 | 520–720 | 40 | 40 | — |
| SS321 4541-321-00-I | Cold-rolled strip | ≤8 | +AT | Transverse | 220 | 250 | 520–720 | 40 | 40 | — |
| SS321 4541-321-00-I | Hot-rolled strip | ≤13.5 | +AT | Transverse | 200 | 240 | 520–720 | 40 | 40 | — |
| SS321 4541-321-00-I | Hot-rolled plate | ≤75 | +AT | Transverse | 200 | 240 | 500–700 | 40 | 40 | — |
| SS347 4550-347-00-I | Hot-rolled strip | ≤13.5 | +AT | Transverse | 200 | 240 | 520–720 | 40 | 40 | — |
| SS347 4550-347-00-I | Hot-rolled plate | ≤75 | +AT | Transverse | 200 | 240 | 500–700 | 40 | 40 | — |
| SS904L 4539-089-04-I | Cold-rolled strip | ≤8 | +AT | Transverse | 240 | 270 | 530–730 | 35 | 35 | — |
| SS904L 4539-089-04-I | Hot-rolled strip | ≤13.5 | +AT | Transverse | 220 | 260 | 530–730 | 35 | 35 | — |
| SS904L 4539-089-04-I | Hot-rolled plate | ≤75 | +AT | Transverse | 220 | 260 | 520–720 | 40 | 40 | — |
| 254 SMO 4547-312-54-I | Cold-rolled strip | ≤8 | +AT | Transverse | 320 | 350 | 650–850 | 35 | 35 | — |
| 254 SMO 4547-312-54-I | Hot-rolled strip | ≤13.5 | +AT | Transverse | 300 | 340 | 650–850 | 35 | 35 | — |
| 254 SMO 4547-312-54-I | Hot-rolled plate | ≤75 | +AT | Transverse | 300 | 340 | 650–850 | 40 | 40 | — |
| Duplex 2205 4462-318-03-I | Cold-rolled strip | ≤8 | +AT | Transverse; width ≥300 mm | 500 | — | 700–950 | 20 | 20 | — |
| Duplex 2205 4462-318-03-I | Hot-rolled strip | ≤13.5 | +AT | Transverse; width ≥300 mm | 460 | — | 700–950 | 25 | 25 | — |
| Duplex 2205 4462-318-03-I | Hot-rolled plate | ≤75 | +AT | Transverse; width ≥300 mm | 460 | — | 640–840 | 25 | 25 | — |
| Duplex S31803 4462-318-03-I | Cold-rolled strip | ≤8 | +AT | Transverse; width ≥300 mm | 500 | — | 700–950 | 20 | 20 | — |
| Duplex S31803 4462-318-03-I | Hot-rolled strip | ≤13.5 | +AT | Transverse; width ≥300 mm | 460 | — | 700–950 | 25 | 25 | — |
| Duplex S31803 4462-318-03-I | Hot-rolled plate | ≤75 | +AT | Transverse; width ≥300 mm | 460 | — | 640–840 | 25 | 25 | — |
| Super Duplex 2507 4410-327-50-E | Cold-rolled strip | ≤8 | +AT | Transverse; width ≥300 mm | 550 | — | 750–1000 | 20 | 20 | — |
| Super Duplex 2507 4410-327-50-E | Hot-rolled strip | ≤13.5 | +AT | Transverse; width ≥300 mm | 530 | — | 750–1000 | 20 | 20 | — |
| Super Duplex 2507 4410-327-50-E | Hot-rolled plate | ≤75 | +AT | Transverse; width ≥300 mm | 530 | — | 730–930 | 20 | 20 | — |
Room-temperature properties for the stated product form and condition. Proof strengths and elongation are minima unless a range is shown. A80 uses an 80 mm gauge length below 3 mm thickness; A uses 5.65√S₀ from 3 mm thickness. +AT means solution annealed. For austenitic strip below 300 mm width tested longitudinally, A80 is reduced by 5 percentage points and A by 2 points. For stretcher-levelled SS304, elongation minima are 5 points lower.