GOST · Russia / CIS · 6 designations

КО-3

КО-3 is a designation in GOST for the grade also listed as 08KH18G8N2T. We list 6 designations recorded for this grade, in the standards GOST.

Designations 6

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If you came for one of these

The most-used names for this grade.

GOST08KH18G8N2TThis grade’s own name

Also known as

6 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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 · 6

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

Chemical composition

9 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 70.1 %Cr — 18 %Mn — 8 %Ni — 2.3 %Traces & impurities · 1.6 %

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

Element	% by weight
	≤ 0.08
	≤ 0.8
	7–9 —
	≤ 0.035
	≤ 0.025
	17–19
	1.8–2.8
	≤ 0.3
	0.2–0.5

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	max 0.08	—	0.080	Max
Si	max 0.8	—	0.800	Max
P	max 0.035	—	0.035	Max
S	max 0.025	—	0.025	Max
Ti	0.2 - 0.5	0.200	0.500	Range
Cr	17 - 19	17.000	19.000	Range
Mn	7 - 9	7.000	9.000	Range
Ni	1.8 - 2.8	1.800	2.800	Range
Cu	max 0.3	—	0.300	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

Weldabilityreadily weldableAs published: without limitations.

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 · 20 values

By dimensionno delivery state statedsource splav

Dimensionmm	RmN/mm²	ReN/mm²
to 600	588	265

By heat-treated conditionno delivery state statedsource splav

Heat-treated condition	RmN/mm²	ReN/mm²	A5%	KCUkJ/m²
Sheet trick, GOST 7350-77	590	345	20	590

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	7.7	212	—	21	—	710
100	—	203	12.3	—	462	—
200	—	195	—	—	—	—
300	—	184	—	—	—	—
400	—	177	—	—	—	—
500	—	164	—	—	—	—
600	—	167	—	—	—	—
700	—	146	—	—	—	—
800	—	161	—	—	—	—

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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