BS · United Kingdom · 15 designations

821 grade Nb

821 grade Nb is a designation in BS for the material held under material number 1.4552, also listed as G-X 5 CrNiNb 18 9. It is a material in the category Cast stainless steels. We list 15 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, SAE AMS and JIS.

Material no. 1.4552
Category Cast stainless steels · 87 grades
Designations 15

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If you came for one of these

The most-used names for this grade.

About Cast stainless steels

Cast stainless steels are stainless-steel materials produced by casting, combining corrosion resistance with the ability to form complex component shapes. Their composition and mechanical behaviour vary by grade, and they are used for corrosion-resistant cast components such as pumps, valves and process equipment.

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

Also known as

15 designations · 8 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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

UNSUnited States · 2

AISI / SAEUnited States · 3

BSUnited Kingdom · 2

347 C 17Indicative
821 grade NbIndicative

AFNORFrance · 1

Z4CNNb19.10MIndicative

UNESpain · 2

SAE AMSUnited States / Aerospace · 1

5362Indicative

JISJapan · 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 — 66.9 %Cr — 19 %Ni — 10.5 %Si — 1.5 %Traces & impurities · 2.1 %

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

Element	% by weight
	≤ 0.07
	≤ 1.5
	≤ 1.5
	0.04
	0.03
	18–20
	9–12
	≤ 0.5

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	≤0,07	—	0.070	Max
Si	≤1,50	—	1.500	Max
P	0,04	0.040	0.040	Exact
S	0,03	0.030	0.030	Exact
Cr	18,0-20,0	18.000	20.000	Range
Mn	≤1,50	—	1.500	Max
Ni	9,00-12,0	9.000	12.000	Range
Cu	≤0,50	—	0.500	Max

8xC≤1,00
8xC≤1,00
8xC≤1,00

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

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 / Ni 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.

GX2CrNi19-111.4309

Cr 18,0-20,0 · Ni 9,00-12,0