UNE · Spain · 22 designations

F.1145-C45k

F.1145-C45k is a designation in UNE for the material held under material number 1.1201, also listed as C45R. It is a material in the category Quenched and tempered steels. We list 22 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, ISO, JIS, GB, UNI and SS.

Material no. 1.1201
Category Quenched and tempered steels · 133 grades
Designations 22

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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

22 designations · 12 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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

AISI / SAEUnited States · 2

ASTMUnited States · 1

A830Indicative

BSUnited Kingdom · 2

AFNORFrance · 3

UNESpain · 4

ISOInternational · 2

JISJapan · 1

S50CIndicative

GBChina · 1

50Indicative

UNIItaly · 1

C45Indicative

SSSweden · 1

1660Indicative

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 — 97.5 %Mn — 0.7 %C — 0.5 %Si — 0.4 %Traces & impurities · 1 %

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

Element	% by weight
	0.42–0.5
	≤ 0.4
	0.5–0.8
	0.03
	0.02–0.04
	≤ 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	0,42-0,50	0.420	0.500	Range
Si	≤0,40	—	0.400	Max
P	0,03	0.030	0.030	Exact
S	0,020-0,040	0.020	0.040	Range
Cr	≤0,40	—	0.400	Max
Mn	0,50-0,80	0.500	0.800	Range
Ni	≤0,40	—	0.400	Max
Mo	≤0,10	—	0.100	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

computed from composition · °C

Predicted Ae3764°C

Predicted Ae1724°C

Predicted Acm637°C

Predicted Bs556°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

Density7,7g/cm³Exact

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

5 conditions · 19 values

By thicknessCold drawn / hardsource steelnumber

Thicknessmm	RmN/mm²	A%
5 – 10	750 – 1050	5
10 – 16	710 – 1030	6
16 – 40	650 – 1000	7
40 – 63	630 – 900	8
63 – 100	580 – 850	8

By thicknessNormalizedsource steelnumber

Thicknessmm	RmN/mm²	A%
≤ 16	620	14
16 – 100	580	16
100 – 250	560	16

By delivery stateTreated to improve shearabilitysource steelnumber

Delivery state	HB
Treated to improve shearability	255

By delivery stateSoft annealedsource steelnumber

Delivery state	HB
Soft annealed	207

By delivery stateAs rolled and turnedsource steelnumber

Delivery state	HB
As rolled and turned	172 – 242

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 1.1, 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.

C30E1.1178

Mn 0,50-0,80 · Si ≤0,40