GOST · Russia / CIS · 5 designations

ЭИ579

ЭИ579 is a designation in GOST for the grade also listed as 20Kh3MVF. We list 5 designations recorded for this grade, in the standards GOST.

Designations 5

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If you came for one of these

The most-used names for this grade.

GOST20Kh3MVFThis grade’s own name

Also known as

5 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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 · 5

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

Chemical composition

11 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 94 %Cr — 3.1 %V — 0.7 %Mo — 0.5 %Traces & impurities · 1.8 %

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

Element	% by weight
	0.15–0.23
	0.17–0.37
	0.25–0.5
	≤ 0.03
	≤ 0.025
	2.8–3.3
	0.35–0.55
	≤ 0.3
	0.6–0.85
	0.3–0.5
	≤ 0.2

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	0.15 - 0.23	0.150	0.230	Range
Si	0.17 - 0.37	0.170	0.370	Range
P	max 0.03	—	0.030	Max
S	max 0.025	—	0.025	Max
V	0.6 - 0.85	0.600	0.850	Range
Cr	2.8 - 3.3	2.800	3.300	Range
Mn	0.25 - 0.5	0.250	0.500	Range
Ni	max 0.3	—	0.300	Max
Cu	max 0.2	—	0.200	Max
Mo	0.35 - 0.55	0.350	0.550	Range
W	0.3 - 0.5	0.300	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

computed from composition · °C

Predicted Ae3812°C

Predicted Ae1797°C

Predicted Acm529°C

Predicted Bs467°C

These four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either.

Physical & mechanical properties

Transformation point Ac1800°CExact

Transformation point Ac3900°CExact · Ac3(Acm)

Transformation point Ar3790°CExact · Ar3(Arcm)

Transformation point Ar1680°CExact

Weldabilityweldable with restrictionsAs published: limited weldability.

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

3 conditions · 55 values

By heat-treated conditionno delivery state statedsource splav

Heat-treated condition	RmN/mm²	ReN/mm²	A5%	Z%	KCUkJ/m²
Bar, band, GOST 20072-74	880	735	12	40	590
Arbor, rotor	750	650	13	40	500
Arbor, rotor	730	620	11	32	400

By delivery stateno delivery state statedsource splav

Delivery state	HB
20Kh3MVF ( 20Х3МВФ ) (hot-rolled, annealing) , GOST 20072-74	269

At temperatureno delivery state statedsource splav

Temperature°C	Densityg/cm³	Elastic modulusGPa	Thermal expansion coefficient10^-6/K	Thermal conductivityW/(m·K)	Specific heat capacityJ/(kg·K)	Electrical resistivitynΩ·m
20	7.8	207	—	38.5	—	—
100	—	204	10.6	35.6	502	398
200	—	200	11.5	33.1	560	465
300	—	193	11.8	31.4	610	544
400	7.69	186	12.1	30.6	650	640
500	7.66	182	12.6	29.7	710	743
600	7.62	177	13	29.3	750	859
700	—	171	—	28.9	—	982

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?

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