GOST · Russia / CIS · 3 designations

ЭП788

ЭП788 is a designation in GOST for the grade also listed as 6KH3MFS. We list 3 designations recorded for this grade, in the standards GOST.

Designations 3

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If you came for one of these

The most-used names for this grade.

GOST6KH3MFSThis 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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 — 94 %Cr — 3 %C — 0.6 %Si — 0.5 %Traces & impurities · 2 %

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

Element	% by weight
	0.55–0.62
	0.35–0.65
	0.2–0.6
	≤ 0.03
	≤ 0.03
	2.6–3.3
	0.2–0.5
	≤ 0.4
	0.3–0.6
	≤ 0.3

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	0.55 - 0.62	0.550	0.620	Range
Si	0.35 - 0.65	0.350	0.650	Range
P	max 0.03	—	0.030	Max
S	max 0.03	—	0.030	Max
V	0.3 - 0.6	0.300	0.600	Range
Cr	2.6 - 3.3	2.600	3.300	Range
Mn	0.2 - 0.6	0.200	0.600	Range
Ni	max 0.4	—	0.400	Max
Cu	max 0.3	—	0.300	Max
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

This grade's composition falls outside the published model's validated range (a low-alloy composition window), so no transformation temperature is predicted here.

Physical & mechanical properties

Transformation point Ac1760°CExact

Transformation point Ac3950°CExact · Ac3(Acm)

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

1 conditions · 1 values

By delivery stateno delivery state statedsource splav

Delivery state	HB
6KH3MFS ( 6Х3МФС ) (annealing) , GOST 5950-2000	241

Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ.

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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