GOST · Russia / CIS · 3 designations

ЭП303Б

ЭП303Б is a designation in GOST for the grade also listed as 55Kh20G9AN4B. We list 3 designations recorded for this grade, in the standards GOST.

Designations 3

Search Inquiry Datasheet as PDFPrint-ready A4 documentGenerating …Download startedTry again

If you came for one of these

The most-used names for this grade.

GOST55Kh20G9AN4BThis grade’s own name

Also known as

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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.

GOSTRussia / CIS · 3

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

Chemical composition

10 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 63.5 %Cr — 21 %Mn — 9 %Ni — 4 %Traces & impurities · 2.5 %

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

Element	% by weight
	0.5–0.6
	≤ 0.45
	8–10 —
	≤ 0.04
	≤ 0.03
	20–22
	3.5–4.5
	≤ 0.3
	0.4–1
	0.3–0.6 —

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	0.5 - 0.6	0.500	0.600	Range
N	0.3 - 0.6	0.300	0.600	Range
Si	max 0.45	—	0.450	Max
P	max 0.04	—	0.040	Max
S	max 0.03	—	0.030	Max
Cr	20 - 22	20.000	22.000	Range
Mn	8 - 10	8.000	10.000	Range
Ni	3.5 - 4.5	3.500	4.500	Range
Cu	max 0.3	—	0.300	Max
Nb	0.4 - 1	0.400	1.000	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: Mo.

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.

Search Inquiry Datasheet as PDFPrint-ready A4 documentGenerating …Download startedTry again