GB · China · 2 designations

25Mn

25Mn is a designation in GB for the grade also listed as A266. We list 2 designations recorded for this grade, in the standards ASTM and GB.

Designations 2

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Also known as

2 designations · 2 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.

ASTMUnited States · 1

A266Indicative

GBChina · 1

25MnThis 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

8 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 97.8 %Mn — 0.9 %Ni — 0.3 %Si — 0.3 %Traces & impurities · 0.8 %

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

Element	% by weight
	0.22–0.29
	0.17–0.37
	0.7–1
	≤ 0.035
	≤ 0.03
	≤ 0.2
	≤ 0.3
	≤ 0.25

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	0.22-0.29	0.220	0.290	Range
Si	0.17-0.37	0.170	0.370	Range
P	≤0.035	—	0.035	Max
S	≤0.03	—	0.030	Max
Cr	≤0.2	—	0.200	Max
Mn	0.7-1	0.700	1.000	Range
Ni	≤0.3	—	0.300	Max
Cu	≤0.25	—	0.250	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

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

Physical & mechanical properties

Rm≥490N/mm²Min

A≥22%Min

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.

Heat treatment

Supply condition

Normalizing and Quenching and TemperingTest specimen diameterd=25
Normalizing and Quenching and TemperingTest specimen sized=25

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

Looking for this grade under another name?

Search the catalogue by designation, material number or composition — every name on this page is itself a way in.

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