Material number · Europe · 2 designations

1.4745

1.4745 is the material number of the grade also listed as GX 40 CrSi 23. It is a material in the category Heat-resistant cast steels. We list 2 designations recorded for this grade, in the standards DIN / EN.

Material no. 1.4745
Category Heat-resistant cast steels · 82 grades
Designations 2

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If you came for one of these

The most-used names for this grade.

DIN / ENGX40CrSi24This grade’s own name

About Heat-resistant cast steels

Heat-resistant cast steels are cast ferrous alloys formulated for service at elevated temperatures, where resistance to softening and thermal degradation is important. They are used for furnace components, heat-treatment equipment and other high-temperature plant parts that require cast shapes and dependable mechanical performance during heating.

This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.

Also known as

2 designations · 1 standards · nothing hidden

This grade’s own namerecorded in our sources as this grade’s own designation under that standard.

Indicativetaken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering.

Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.

DIN / ENEurope · 2

Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.

Chemical composition

8 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 70.8 %Cr — 24.5 %Si — 1.8 %Mn — 1 %Traces & impurities · 2 %

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

Element	% by weight
	0.3–0.5
	1–2.5
	≤ 1
	0.04
	0.03
	23–26
	≤ 0.5
	1

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	0,30-0,50	0.300	0.500	Range
Si	1,00-2,50	1.000	2.500	Range
P	0,04	0.040	0.040	Exact
S	0,03	0.030	0.030	Exact
Cr	23,0-26,0	23.000	26.000	Range
Mn	≤1,00	—	1.000	Max
Ni	1	1.000	1.000	Exact
Mo	≤0,50	—	0.500	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

Density7,85g/cm³Exact

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.

Similar grades — and why

Selection rule, stated so you can disagree with it: same number class 1.4, a shared category, and a published range for Cr / Si that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade.

GX40CrNiSiNb24-241.4855

Cr 23,0-25,0 · Si 1,00-2,50