STR38
STR38 is a material in the category Heat resistant steels. Its recorded composition includes C 0.25–0.35%, Cr 19–21%, Mn ≤ 1.2%, Ni 10–12% and Mo 1.8–2.5%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include Rm 880 N/mm², Re 490 N/mm², A 20%, HB 269 and Z 25%.
- Category Heat resistant steels · 64 grades
- Designations 1
About Heat resistant steels
Heat resistant steels are alloyed materials designed to retain useful mechanical properties and resist oxidation or scaling during service at elevated temperatures. They are used for components in furnaces, boilers, heat exchangers and power-generation equipment exposed to hot gases or sustained heat.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Chemical composition
9 elements on file · weight %What this alloy is
Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade.
| Element | % by weight |
|---|---|
0.25–0.35 | |
≤ 1 | |
≤ 1.2 | |
0.18–0.25 — | |
≤ 0.03 | |
19–21 | |
1.8–2.5 | |
10–12 | |
0.001–0.01 |
The scale is logarithmic, not the element’s raw share of the alloy — the only honest way to fit 0.01 % and 100 % in one picture, and it means every value here can be compared with every other.
| Element | As publishedsource text, verbatim | Min% by weight | Max% by weight | Bound |
|---|---|---|---|---|
| B | 0.001 - 0.01 | 0.001 | 0.010 | Range |
| C | 0.25 - 0.35 | 0.250 | 0.350 | Range |
| Si | max 1 | — | 1.000 | Max |
| P | 0.18 - 0.25 | 0.180 | 0.250 | Range |
| S | max 0.03 | — | 0.030 | Max |
| Cr | 19 - 21 | 19.000 | 21.000 | Range |
| Mn | max 1.2 | — | 1.200 | Max |
| Ni | 10 - 12 | 10.000 | 12.000 | Range |
| Mo | 1.8 - 2.5 | 1.800 | 2.500 | Range |
The published column is the source string byte-for-byte, decimal comma and all; Min and Max are the parsed bounds. Elements not listed have no value on file — they are omitted, never inferred.
Predicted transformation temperatures
This grade's composition falls outside the published model's validated range (a low-alloy composition window), so no transformation temperature is predicted here.
Physical & mechanical properties
An absent property means we hold no value for it — it is left out rather than estimated, interpolated from a neighbouring grade, or filled from a handbook. It does not mean the property is undefined for the material.
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