DIN / EN · Europe · 1 designation

23CrMoB3-3

23CrMoB3-3 is a material in the category Case hardening steels, held under material number 1.7271. Its recorded composition includes C 0.2–0.25%, Si 0.15–0.35%, Cr 0.7–0.9%, Mn 0.7–0.9% and Mo 0.3–0.4%. No cross-standard equivalents are recorded for this grade yet. Its recorded density is 7.85 g/cm³.

Material no. 1.7271
Category Case hardening steels · 60 grades
Designations 1

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About Case hardening steels

Case hardening steels are steels designed to develop a hard, wear-resistant surface while retaining a tough and ductile core. They are used for components such as gears, shafts and other machine parts exposed to contact wear and cyclic loading.

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

Chemical composition

8 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 97.5 %Mn — 0.8 %Cr — 0.8 %Mo — 0.4 %Traces & impurities · 0.5 %

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

Element	% by weight
	0.2–0.25
	0.15–0.35
	0.7–0.9
	0.035
	0.035
	0.7–0.9
	0.3–0.4
	0.0008–0.005

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
B	0,0008-0,0050	0.001	0.005	Range
C	0,20-0,25	0.200	0.250	Range
Si	0,15-0,35	0.150	0.350	Range
P	0,035	0.035	0.035	Exact
S	0,035	0.035	0.035	Exact
Cr	0,70-0,90	0.700	0.900	Range
Mn	0,70-0,90	0.700	0.900	Range
Mo	0,30-0,40	0.300	0.400	Range

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

Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni.

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 1.7, a shared category, and a published range for Cr / Mn 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.

22CrMoS3-51.7333

Cr 0,70-1,00 · Mn 0,70-1,00