ISO 4955
Heat-resistant steels and alloys for flat products used in elevated-temperature environments.
Heat-resistant flat products
Heat-resistant steels and alloys for flat products used in elevated-temperature environments.
Data edition: ISO 4955:2016
Material requirements. Defined by product form.
Heat-resistant steels and alloys for flat products used in elevated-temperature environments.
Selected Table 2 compositions and Table 6 flat-product requirements. The exact ISO designations control these rows; the website material names are navigation references.
Find your material grade
3 material references with ISO 4955 data.
ISO 4955 properties
Select a table to compare requirements.
| Grade / designation | C | Si | Mn | P | S | Cr | Ni | Mo | N | Other elements |
|---|---|---|---|---|---|---|---|---|---|---|
| SS309 4833-309-08-I | ≤0.20 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 22.0–24.0 | 12.0–15.0 | — | ≤0.10 | — |
| SS310 4845-310-08-E | ≤0.10 | ≤1.50 | ≤2.00 | ≤0.045 | ≤0.015 | 24.0–26.0 | 19.0–22.0 | — | ≤0.10 | — |
| Incoloy 800 4876-088-00-I | 0.05–0.10 | ≤1.00 | ≤1.50 | ≤0.015 | ≤0.015 | 19.0–23.0 | 30.0–34.0 | — | — | Al: 0.15–0.60; Ti: 0.15–0.60; Cu ≤0.70 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| SS309 4833-309-08-I | Flat products | 0.5–75 | +AT | Transverse | 210 | 250 | 500–700 | 33 | 35 | HB ≤192 |
| SS310 4845-310-08-E | Flat products | 0.5–75 | +AT | Transverse | 210 | 250 | 500–700 | 33 | 35 | HB ≤192 |
| Incoloy 800 4876-088-00-I | Flat products | 0.5–75 | +AT | Transverse | 170 | 210 | 450–680 | 28 | 30 | HB ≤192 |
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.