BS · United Kingdom · 101 designations

En9

En9 is a designation in BS for the material held under material number 1.0535, also listed as C55. It is a material in the category Quenched and tempered steels. We list 101 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, SS, ČSN, STN, PN, SRPS, MSZ, AS / NZS, STAS, BDS, NBN and KS.

Material no. 1.0535
Category Quenched and tempered steels · 133 grades
Designations 101

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If you came for one of these

The most-used names for this grade.

About Quenched and tempered steels

Quenched and tempered steels are heat-treated steels designed to combine high strength with useful toughness and ductility. They are used for heavily loaded components such as shafts, gears, fasteners and structural machine parts where resistance to mechanical stress is required.

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

Also known as

101 designations · 22 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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 · 3

UNSUnited States · 2

AISI / SAEUnited States · 7

BSUnited Kingdom · 9

AFNORFrance · 18

UNESpain · 5

ISOInternational · 3

JISJapan · 5

GBChina · 5

GOSTRussia / CIS · 6

UNIItaly · 8

SSSweden · 2

ČSNCzechia · 2

STNSlovakia · 1

12 060Indicative

PNPoland · 5

SRPSSerbia · 1

Č.1630Indicative

MSZHungary · 2

AS / NZSAustralia / New Zealand · 2

STASRomania · 5

BDSBulgaria · 5

NBNBelgium · 3

KSSouth Korea · 2

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 — 97.3 %Mn — 0.8 %C — 0.6 %Si — 0.4 %Traces & impurities · 1 %

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

Element	% by weight
	0.52–0.6
	≤ 0.4
	0.6–0.9
	0.045
	0.045
	≤ 0.4
	≤ 0.1
	≤ 0.4

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	0,52-0,60	0.520	0.600	Range
Si	≤0,40	—	0.400	Max
P	0,045	0.045	0.045	Exact
S	0,045	0.045	0.045	Exact
Cr	≤0,40	—	0.400	Max
Mn	0,60-0,90	0.600	0.900	Range
Ni	≤0,40	—	0.400	Max
Mo	≤0,10	—	0.100	Max

(Cr + Mo + Ni) ≤ 0,63
(Cr + Mo + Ni) ≤ 0,63
(Cr + Mo + Ni) ≤ 0,63

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 Ae3744°C

Predicted Ae1723°C

Predicted Acm687°C

Predicted Bs547°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

Density7,85g/cm³Exact

Transformation point Ac1725°CExact

Transformation point Ac3760°CExact · Ac3(Acm)

Transformation point Ar3750°CExact · Ar3(Arcm)

Transformation point Ar1690°CExact

Weldabilitydifficult to weldAs published: hard weldability.

Flake sensitivityslightly susceptibleAs published: weakly predisposed

Temper brittlenessnot susceptibleAs published: not 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

9 conditions · 67 values

By thicknessNormalizedsource steelnumber

Thicknessmm	RmN/mm²	A%
≤ 16	680	11
16 – 100	640	12
100 – 250	620	12
250 – 500	600	—
500 – 1000	590	—

By thicknessCold drawn / hardsource steelnumber

Thicknessmm	RmN/mm²	A%
5 – 10	770 – 1100	5
10 – 16	730 – 1080	6
16 – 40	690 – 1050	7
40 – 63	650 – 1030	8

By delivery stateno delivery state statedsource splav

Delivery state	RmN/mm²	A5%	Z%	HB
Rolled stock cold-worked , GOST 1050-88	660	6	30	—
Rolled stock annealed , GOST 1050-88	560	12	40	—
Bar GOST 10702-78	—	—	—	217
Rolled stock GOST 1050-88	—	—	—	241

By dimensionNormalizingsource splav

Dimensionmm	RmN/mm²	ReN/mm²	A5%	Z%
to 80	630	375	14	40

By delivery stateTreated to improve shearabilitysource steelnumber

Delivery state	HB
Treated to improve shearability	255

By dimensionAnnealingsource splav

Dimensionmm	RmN/mm²	A5%
6 - 60	580	17

By delivery stateSoft annealedsource steelnumber

Delivery state	HB
Soft annealed	229

By delivery stateAs rolled and turnedsource steelnumber

Delivery state	HB
As rolled and turned	181 – 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	7.81	216	—	48	—	272
100	—	213	11.2	48	487	—
200	—	207	12	47	500	—
300	—	200	12.8	44	517	—
400	—	180	13.4	41	533	—
500	—	171	13.9	38	559	—
600	—	154	14.2	35	584	—
700	—	136	14.5	31	—	—
800	—	123	13.4	27	—	—

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.

Heat treatment

Supply condition

Normalizing and TemperingSupply condition

Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied.

Source: www.caishuku.com

Similar grades — and why

Selection rule, stated so you can disagree with it: same number class 1.0, a shared category, and a published range for Mn / Si 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.

C501.0540

Mn 0,60-0,90 · Si ≤0,40