A266
25Mn is a grade designated under GB. Its recorded composition includes C 0.22–0.29%, Si 0.17–0.37%, Mn 0.7–1%, Ni ≤ 0.3% and Cu ≤ 0.25%. We list one designation recorded for this grade, in the standard ASTM. Recorded mechanical properties include Rm ≥ 490 N/mm² and A ≥ 22%.
- Designations 2
If you came for one of these
The most-used names for this grade.Also known as
2 designations · 2 standards · nothing hidden- A266Indicative
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
8 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 |
|---|---|
0.22–0.29 | |
0.17–0.37 | |
0.7–1 | |
≤ 0.035 | |
≤ 0.03 | |
≤ 0.2 | |
≤ 0.3 | |
≤ 0.25 |
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 |
|---|---|---|---|---|
| C | 0.22-0.29 | 0.220 | 0.290 | Range |
| Si | 0.17-0.37 | 0.170 | 0.370 | Range |
| P | ≤0.035 | — | 0.035 | Max |
| S | ≤0.03 | — | 0.030 | Max |
| Cr | ≤0.2 | — | 0.200 | Max |
| Mn | 0.7-1 | 0.700 | 1.000 | Range |
| Ni | ≤0.3 | — | 0.300 | Max |
| Cu | ≤0.25 | — | 0.250 | Max |
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
Not enough recorded composition to predict a transformation temperature for this grade — missing: Mo.
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.
Heat treatment
Supply condition
- Normalizing and Quenching and TemperingTest specimen diameterd=25
- Normalizing and Quenching and TemperingTest specimen sized=25
Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied.
Source: www.caishuku.com
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