GB · China · 1 designation

20CrMnSi

20CrMnSi is a grade designated under GB. Its recorded composition includes C 0.17–0.23%, Si 0.9–1.2%, Cr 0.8–1.1%, Mn 0.8–1.1% and Ni ≤ 0.3%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include Rm 450–700 N/mm², A ≥ 21% and HB 207–255; these figures vary with the delivery condition and dimension.

Designations 1

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Chemical composition

9 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 96.1 %Si — 1.1 %Mn — 1 %Cr — 1 %Traces & impurities · 1 %

Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade.

Element	% by weight
	0.17–0.23
	0.9–1.2
	0.8–1.1
	≤ 0.03
	≤ 0.03
	0.8–1.1
	≤ 0.1
	≤ 0.3
	≤ 0.3

0.01 %0.1 %1 %10 %100 %

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	0.17-0.23	0.170	0.230	Range
Si	0.9-1.2	0.900	1.200	Range
P	≤0.03	—	0.030	Max
S	≤0.03	—	0.030	Max
Cr	0.8-1.1	0.800	1.100	Range
Mn	0.8-1.1	0.800	1.100	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 · °C

Predicted Ae3844°C

Predicted Ae1756°C

Predicted Acm503°C

Predicted Bs539°C

These 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 values

6 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

GJB 1220

In this orderd=25

Quenching880 °C
Cooling Oil
Tempering480 °C
Cooling Water or Oil

Supply condition

Annealing
Quenching and Temperingd=25
Annealing and Tempering and NormalizingSupply condition
Annealing or TemperingSteel product

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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