UNI · Italy · 76 designations

X15CrNi18-09

X15CrNi18-09 is a designation in UNI for the material held under material number 1.4300, also listed as X 12 CrNi 18 8. It is a material in the category Stainless steels. We list 76 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, SAE AMS, JIS, GB, GOST, UNI, SS, ČSN, PN and ABNT NBR.

Material no. 1.4300
Category Stainless steels · 468 grades
Designations 76

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If you came for one of these

The most-used names for this grade.

About Stainless steels

Stainless steels are corrosion-resistant alloy steels whose chromium content promotes a protective passive surface film. They are used for equipment, structures and components exposed to moisture, chemicals or hygienic service, with different alloy compositions selected for corrosion resistance, strength, formability or weldability.

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

Also known as

76 designations · 16 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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 · 1

X 12 CrNi 18 8This grade’s own nameWithdrawn

UNSUnited States · 2

AISI / SAEUnited States · 6

BSUnited Kingdom · 3

AFNORFrance · 4

UNESpain · 4

SAE AMSUnited States / Aerospace · 16

JISJapan · 2

GBChina · 1

1Cr18Ni9Indicative

GOSTRussia / CIS · 9

UNIItaly · 3

SSSweden · 1

2331Indicative

ČSNCzechia · 2

PNPoland · 1

1H18N9Indicative

ABNT NBRBrazil · 1

302Indicative

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

Chemical composition

7 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 69.8 %Cr — 18 %Ni — 9 %Mn — 2 %Traces & impurities · 1.2 %

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

Element	% by weight
	≤ 0.12
	≤ 1
	≤ 2
	0.045
	0.03
	17–19
	8–10

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	≤0,12	—	0.120	Max
Si	≤1,00	—	1.000	Max
P	0,045	0.045	0.045	Exact
S	0,03	0.030	0.030	Exact
Cr	17,0-19,0	17.000	19.000	Range
Mn	≤2,00	—	2.000	Max
Ni	8,00-10,0	8.000	10.000	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

Not enough recorded composition to predict a transformation temperature for this grade — missing: Mo.

Physical & mechanical properties

Density7,85g/cm³Exact

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

6 conditions · 73 values

By delivery stateno delivery state statedsource splav

Delivery state	RmN/mm²	ReN/mm²	A5%	Z%	HB
Pipe cooling strain, GOST 9941-81	549	—	37	—	—
Pipe hot strain, GOST 9940-81	529	—	40	—	—
Bar cold-worked , GOST 18907-73	880 – 930	—	—	—	—
Bar, GOST 18907-73	640 – 880	—	20	—	—
Forging, GOST 25054-81	490	196	35 – 40	40 – 48	—
Sheet thin cold-worked , GOST 5582-75	930 – 1230	—	13	—	—
Sheet thin cold-worked , GOST 4986-79	980	—	3 – 5	—	—
12KH18N9 ( 12Х18Н9 ) , Forging GOST 25054-81	—	—	—	—	179

By delivery stateno delivery state statedsource steeljis

Delivery state	RmN/mm²	ReN/mm²	A%	Z%
Bars/Rods	520	205	40	60

By dimensionQuenching 1050 - 1100°C,Cooling airsource splav

Dimensionmm	RmN/mm²	ReN/mm²	A5%	Z%
Ø 60	490	196	45	55

By heat-treated conditionno delivery state statedsource splav

Heat-treated condition	RmN/mm²	ReN/mm²	A5%
Sheet trick, GOST 7350-77	530	215	38

By heat-treated conditionno delivery state statedsource splav

Heat-treated condition	RmN/mm²	ReN/mm²	A5%
Sheet thin, GOST 5582-75	540	195	38

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	7.9	205	—	15	—	725
100	7.86	202	16.6	16.3	504	792
200	7.82	197	17	17.5	—	860
300	7.78	190	17.2	18.8	—	920
400	7.74	181	17.5	21.3	—	976
500	7.69	173	17.9	23	—	1028
600	7.65	160	18.2	26.8	—	1070
700	7.6	150	18.6	25.9	—	1117
800	7.56	—	18.9	—	—	—
900	—	—	19.3	—	—	—

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 1.4, a shared category, and a published range for Cr / Ni 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.

1.43051.4305

Cr 17,0-19,0 · Ni 8,00-10,0