ASTM · United States · 2 designations

P21

1Ni3MnCuMoAl is a grade designated under GB. Its recorded composition includes C 0.1–0.2%, Al 0.7–1.2%, Mn 1.4–2%, Ni 2.9–3.4% and Cu 0.8–1.2%. We list one designation recorded for this grade, in the standard ASTM.

Designations 2

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If you came for one of these

The most-used names for this grade.

GB1Ni3MnCuMoAlThis grade’s own name

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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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

P21Indicative

GBChina · 1

1Ni3MnCuMoAlThis 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 — 92.2 %Ni — 3.2 %Mn — 1.7 %Cu — 1 %Traces & impurities · 1.9 %

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

Element	% by weight
	0.1–0.2
	≤ 0.45
	1.4–2
	≤ 0.03
	≤ 0.015
	0.2–0.5
	2.9–3.4
	0.8–1.2
	0.7–1.2

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	0.1-0.2	0.100	0.200	Range
Al	0.7-1.2	0.700	1.200	Range
Si	≤0.45	—	0.450	Max
P	≤0.03	—	0.030	Max
S	≤0.015	—	0.015	Max
Mn	1.4-2	1.400	2.000	Range
Ni	2.9-3.4	2.900	3.400	Range
Cu	0.8-1.2	0.800	1.200	Range
Mo	0.2-0.5	0.200	0.500	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: Cr.

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.

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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