15Mn
15Mn is a grade designated under GB. Its recorded composition includes C 0.12–0.18%, Si 0.17–0.37%, Cr ≤ 0.25%, Mn 0.7–1% and Ni ≤ 0.3%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include Rm ≥ 410 N/mm², Re ≥ 245 N/mm², A ≥ 26% and HB 163–207; these figures vary with the delivery condition and dimension. Further recorded physical values: E 165–210 GPa, λ 39.78–53.59 W/(m·K), α 12.3–14.9 ·10⁻⁶/K and cp 469 J/(kg·K); several of these are temperature-dependent.
- Designations 1
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 |
|---|---|
0.12–0.18 | |
0.17–0.37 | |
0.7–1 | |
≤ 0.035 | |
≤ 0.035 | |
≤ 0.25 | |
≤ 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 | 0.12-0.18 | 0.120 | 0.180 | Range |
| Si | 0.17-0.37 | 0.170 | 0.370 | Range |
| P | ≤0.035 | — | 0.035 | Max |
| S | ≤0.035 | — | 0.035 | Max |
| Cr | ≤0.25 | — | 0.250 | 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.
Properties by condition
2 conditions · 15 valuescaishuku| Specimen sizemm | RmN/mm² | ReN/mm² | A% |
|---|---|---|---|
| 25 – 25 | ≥ 410 | ≥ 245 | ≥ 26 |
caishuku| Temperature°C | Elastic modulusGPa | Thermal expansion coefficient10^-6/K | Thermal conductivityW/(m·K) | Specific heat capacityJ/(kg·K) |
|---|---|---|---|---|
| 20 | 210 | — | 53.59 | 469 |
| 100 | 200 | 12.3 | 51.08 | — |
| 300 | 185 | 13.2 | 44.38 | — |
| 400 | — | — | 39.78 | — |
| 500 | 165 | — | — | — |
| 600 | — | 14.9 | — | — |
2 further values are held for this grade under a condition the source did not name — a bound with no quantity attached. They are withheld rather than shown against a guessed condition.
Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ.
Heat treatment
Supply condition
- Annealing and Tempering and NormalizingSupply condition
- AnnealingSupply condition
- NormalizingTest 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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