GOST · Russia / CIS · 10 designations

PK70Kh3

PK70Kh3 is a designation in GOST for the grade also listed as 70S3А. We list 10 designations recorded for this grade, in the standards GOST.

Designations 10

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If you came for one of these

The most-used names for this grade.

GOST70S3АThis grade’s own name

Also known as

10 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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 · 10

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 — 95.2 %Si — 2.6 %Mn — 0.8 %C — 0.7 %Traces & impurities · 0.8 %

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

Element	% by weight
	0.66–0.74
	2.4–2.8 —
	0.6–0.9
	≤ 0.025
	≤ 0.025
	≤ 0.3
	≤ 0.25
	≤ 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	0.66 - 0.74	0.660	0.740	Range
Si	2.4 - 2.8	2.400	2.800	Range
P	max 0.025	—	0.025	Max
S	max 0.025	—	0.025	Max
Cr	max 0.3	—	0.300	Max
Mn	0.6 - 0.9	0.600	0.900	Range
Ni	max 0.25	—	0.250	Max
Cu	max 0.2	—	0.200	Max

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

Transformation point Ac1765°CExact

Transformation point Ac3780°CExact · Ac3(Acm)

Weldabilitynot suitable for weldingAs published: is not used.

Flake sensitivitynot susceptibleAs published: not predisposed

Temper brittlenessslightly susceptibleAs published: weakly predisposed

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 · 40 values

By delivery stateno delivery state statedsource splav

Delivery state	HB
(annealing) , GOST 14959-79	269
(without heat treatment) , GOST 14959	302

By heat-treated conditionno delivery state statedsource splav

Heat-treated condition	RmN/mm²	ReN/mm²	A5%	Z%
Rolled stock, GOST 14959-79	1670	1470	6	25

At temperatureno delivery state statedsource splav

Temperature°C	Elastic modulusGPa	Thermal expansion coefficient10^-6/K	Thermal conductivityW/(m·K)	Specific heat capacityJ/(kg·K)
20	214	—	25	—
100	208	11.4	26	480
200	198	12.3	27	510
300	192	12.8	28	520
400	185	13.3	29	535
500	180	13.7	29	565
600	152	14.1	29	585
700	139	14.3	28	620
800	132	12.8	27	700

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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