ISO · International · 5 designations

42CrMo4E

42CrMo4E is a designation in ISO for the grade also listed as 42CrMo4. We list 5 designations recorded for this grade, in the standards DIN / EN, AISI / SAE, ISO, JIS and GB.

Designations 5

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If you came for one of these

The most-used names for this grade.

GBML42CrMoThis grade’s own name

Also known as

5 designations · 5 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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 · 1

42CrMo4Indicative

AISI / SAEUnited States · 1

4140Indicative

ISOInternational · 1

42CrMo4EIndicative

JISJapan · 1

SCM440Indicative

GBChina · 1

ML42CrMoThis grade’s own name

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

Chemical composition

9 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 96.8 %Cr — 1.1 %Mn — 0.8 %C — 0.4 %Traces & impurities · 1 %

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

Element	% by weight
	0.38–0.45
	≤ 0.3
	0.6–0.9
	≤ 0.035
	≤ 0.035
	0.9–1.2
	0.15–0.25
	≤ 0.2
	≤ 0.2

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	0.38-0.45	0.380	0.450	Range
Si	≤0.3	—	0.300	Max
P	≤0.035	—	0.035	Max
S	≤0.035	—	0.035	Max
Cr	0.9-1.2	0.900	1.200	Range
Mn	0.6-0.9	0.600	0.900	Range
Ni	≤0.2	—	0.200	Max
Cu	≤0.2	—	0.200	Max
Mo	0.15-0.25	0.150	0.250	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

computed from composition · °C

Predicted Ae3769°C

Predicted Ae1742°C

Predicted Acm645°C

Predicted Bs525°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

3 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

GB T 6478-2001

In this order

Quenching830–870 °C
Cooling Oil
Tempering500–600 °C

Source: www.caishuku.com

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