U71Mn
U71Mn is a grade designated under GB. Its recorded composition includes C 0.6–0.8%, Si 0.15–0.58%, Cr ≤ 0.15%, Mn 0.7–1.2% and Cu ≤ 0.15%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include Rm ≥ 880 N/mm², A ≥ 10% and HB 260–300.
- Designations 1
Chemical composition
15 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 |
|---|---|
0.6–0.8 | |
0.15–0.58 | |
0.7–1.2 | |
≤ 0.025 | |
≤ 0.025 | |
≤ 0.15 | |
≤ 0.02 | |
≤ 0.1 | |
≤ 0.03 | |
≤ 0.15 | |
≤ 0.004 | |
≤ 0.025 | |
≤ 0.01 | |
≤ 0.03 | |
≤ 0.02 |
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 | 0.6-0.8 | 0.600 | 0.800 | Range |
| Al | ≤0.004 | — | 0.004 | Max |
| Si | 0.15-0.58 | 0.150 | 0.580 | Range |
| P | ≤0.025 | — | 0.025 | Max |
| S | ≤0.025 | — | 0.025 | Max |
| Ti | ≤0.025 | — | 0.025 | Max |
| V | ≤0.03 | — | 0.030 | Max |
| Cr | ≤0.15 | — | 0.150 | Max |
| Mn | 0.7-1.2 | 0.700 | 1.200 | Range |
| Ni | ≤0.1 | — | 0.100 | Max |
| Cu | ≤0.15 | — | 0.150 | Max |
| Nb | ≤0.01 | — | 0.010 | Max |
| Mo | ≤0.02 | — | 0.020 | Max |
| Sn | ≤0.03 | — | 0.030 | Max |
| Sb | ≤0.02 | — | 0.020 | 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
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.
Properties by condition
0 conditions · 0 values3 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.
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