UNE · Spain · 30 designations

F.2621

F.2621 is a designation in UNE for the material held under material number 1.7715, also listed as 14MoV6-3. It is a material in the category Heat-resistant structural steels. We list 30 designations recorded for this grade, in the standards DIN / EN, UNS, ASTM, BS, UNE, GOST, ČSN, PN and MSZ.

Material no. 1.7715
Category Heat-resistant structural steels · 62 grades
Designations 30

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If you came for one of these

The most-used names for this grade.

About Heat-resistant structural steels

Heat-resistant structural steels are structural steels designed to retain useful strength and dimensional stability at elevated temperatures. They are used for load-bearing components in hot-service equipment where mechanical performance must be maintained during heating.

This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.

Also known as

30 designations · 9 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.

DIN / ENEurope · 2

UNSUnited States · 2

ASTMUnited States · 2

BSUnited Kingdom · 4

UNESpain · 2

13MoCrV6Indicative
F.2621Indicative

GOSTRussia / CIS · 13

ČSNCzechia · 1

15128Indicative

PNPoland · 3

MSZHungary · 1

KL 10Indicative

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 — 97.5 %Mo — 0.6 %Mn — 0.6 %Cr — 0.4 %Traces & impurities · 0.9 %

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

Element	% by weight
	0.1–0.18
	≤ 0.4
	0.4–0.7
	0.025
	0.015
	0.3–0.6
	0.5–0.7
	0.22–0.28
	≤ 0.02
	≤ 0.025

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	0,10-0,18	0.100	0.180	Range
Al	≤0,020	—	0.020	Max
Si	≤0,40	—	0.400	Max
P	0,025	0.025	0.025	Exact
S	0,015	0.015	0.015	Exact
V	0,22-0,28	0.220	0.280	Range
Cr	0,30-0,60	0.300	0.600	Range
Mn	0,40-0,70	0.400	0.700	Range
Mo	0,50-0,70	0.500	0.700	Range
Sn	≤0,025	—	0.025	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: Ni.

Physical & mechanical properties

Density7,85g/cm³Exact

Transformation point Ac1760°CExact

Transformation point Ac3890°CExact · Ac3(Acm)

Transformation point Ar3825°CExact · Ar3(Arcm)

Transformation point Ar1730°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

4 conditions · 62 values

By delivery stateno delivery state statedsource splav

Delivery state	RmN/mm²	ReN/mm²	A5%	KCUkJ/m²	HB
Sheet, GOST 5520-79	440 – 640	295	21	790	—
12Kh1MF ( 12Х1МФ ) (normalize)	—	—	—	—	123 – 179
12Kh1MF ( 12Х1МФ ) (hot-rolled, annealing) , GOST 20072-74	—	—	—	—	217

By heat-treated conditionno delivery state statedsource splav

Heat-treated condition	RmN/mm²	ReN/mm²	A5%	Z%	KCUkJ/m²
Bar, GOST 20072-74	470	255	21	55	980

By heat-treated conditionno delivery state statedsource splav

Heat-treated condition	RmN/mm²	ReN/mm²	A5%	Z%	KCUkJ/m²
Forging	480	260	20	50	600

At temperatureno delivery state statedsource splav

Temperature°C	Densityg/cm³	Elastic modulusGPa	Thermal expansion coefficient10^-6/K	Thermal conductivityW/(m·K)	Electrical resistivitynΩ·m
20	7.8	198	—	—	230
100	7.78	193	12.4	44	278
200	7.75	188	13	44	343
300	7.72	183	13.6	42	430
400	7.68	175	14	40	532
500	7.64	167	14.4	37	647
600	7.6	157	14.7	35	775
700	7.57	151	14.9	32	962
800	7.54	—	14.8	28	1087
900	7.56	—	12	28	1130

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.

Similar grades — and why

Selection rule, stated so you can disagree with it: same number class 1.7, a shared category, and a published range for Mo / Mn that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade.

13CrMoSi5-51.7336

Mo 0,45-0,65 · Mn 0,40-0,65