DH40
DH40 is a grade designated under GB. Its recorded composition includes C ≤ 0.18%, Si ≤ 0.5%, Mn 0.9–1.6%, Ni ≤ 0.4% and Cu ≤ 0.35%. No cross-standard equivalents are recorded for this grade yet.
- Designations 1
Chemical composition
13 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 |
|---|---|
≤ 0.18 | |
≤ 0.5 | |
0.9–1.6 | |
≤ 0.025 | |
≤ 0.025 | |
≤ 0.2 | |
≤ 0.08 | |
≤ 0.4 | |
0.05–0.1 | |
≤ 0.35 | |
≥ 0.015 | |
≤ 0.02 | |
0.02–0.05 |
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 | ≤0.18 | — | 0.180 | Max |
| Al | ≥0.015 | 0.015 | — | Min |
| Si | ≤0.5 | — | 0.500 | Max |
| P | ≤0.025 | — | 0.025 | Max |
| S | ≤0.025 | — | 0.025 | Max |
| Ti | ≤0.02 | — | 0.020 | Max |
| V | 0.05-0.1 | 0.050 | 0.100 | Range |
| Cr | ≤0.2 | — | 0.200 | Max |
| Mn | 0.9-1.6 | 0.900 | 1.600 | Range |
| Ni | ≤0.4 | — | 0.400 | Max |
| Cu | ≤0.35 | — | 0.350 | Max |
| Nb | 0.02-0.05 | 0.020 | 0.050 | Range |
| Mo | ≤0.08 | — | 0.080 | 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
computed from composition · °CThese four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either.
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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