27SiMn
27SiMn is a grade designated under GB. Its recorded composition includes C 0.24–0.32%, Si 1.1–1.4%, Cr ≤ 0.3%, Mn 1.1–1.4% and Ni ≤ 0.3%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include Rm 550–800 N/mm², A ≥ 18% and HB 217–255; these figures vary with the delivery condition and dimension.
- Designations 1
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 |
|---|---|
0.24–0.32 | |
1.1–1.4 | |
1.1–1.4 | |
≤ 0.03 | |
≤ 0.03 | |
≤ 0.3 | |
≤ 0.1 | |
≤ 0.3 | |
≤ 0.3 |
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 | 0.24-0.32 | 0.240 | 0.320 | Range |
| Si | 1.1-1.4 | 1.100 | 1.400 | Range |
| P | ≤0.03 | — | 0.030 | Max |
| S | ≤0.03 | — | 0.030 | Max |
| Cr | ≤0.3 | — | 0.300 | Max |
| Mn | 1.1-1.4 | 1.100 | 1.400 | Range |
| Ni | ≤0.3 | — | 0.300 | Max |
| Cu | ≤0.3 | — | 0.300 | Max |
| Mo | ≤0.1 | — | 0.100 | 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.
Properties by condition
0 conditions · 0 values5 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.
Heat treatment
Supply condition
- Annealing
- Quenching and Temperingd=25
- Annealing and Tempering and NormalizingSupply condition
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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