DIN / EN · Europe · 54 designations

C30

C30 is a material in the category Quenched and tempered steels, held under material number 1.0528. We list 53 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, ISO, JIS, GB, GOST, UNI, ČSN, PN, STN, STAS and BDS. Its recorded composition includes C 0.27–0.34%, Si ≤ 0.4%, Cr ≤ 0.4%, Mn 0.5–0.8% and Ni ≤ 0.4%. Recorded mechanical properties include Rm 390–930 N/mm², Re 295 N/mm², A 21%, HB 149–229 and Z 35–50%; these figures vary with the delivery condition and dimension. Its recorded density is 7.85 g/cm³. Further recorded physical values: E 164–200 GPa, λ 32–52 W/(m·K), α 12.1–15.2 ·10⁻⁶/K and cp 470–764 J/(kg·K); several of these are temperature-dependent. Recorded transformation points: Ac1 730 °C, Ac3 820 °C, Ar1 680 °C and Ar3 796 °C. Its weldability is recorded as limited.

Material no. 1.0528
Category Quenched and tempered steels · 133 grades
Designations 54

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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

54 designations · 15 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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

1.0528Indicative
C30This grade’s own name
Ck30Indicative

UNSUnited States · 1

G10300This grade’s own name

AISI / SAEUnited States · 4

BSUnited Kingdom · 5

AFNORFrance · 4

ISOInternational · 4

JISJapan · 5

GBChina · 3

GOSTRussia / CIS · 15

UNIItaly · 3

C30Indicative
C30EIndicative
C30RIndicative

ČSNCzechia · 1

12031Indicative

STNSlovakia · 1

12 031Indicative

PNPoland · 3

STASRomania · 1

OLC30Indicative

BDSBulgaria · 1

30Indicative

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 — 97.7 %Mn — 0.7 %Si — 0.4 %Cr — 0.4 %Traces & impurities · 0.9 %

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

Element	% by weight
	0.27–0.34
	≤ 0.4
	0.5–0.8
	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	0,27-0,34	0.270	0.340	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	0,50-0,80	0.500	0.800	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 Ae3792°C

Predicted Ae1724°C

Predicted Acm539°C

Predicted Bs566°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 Ac1730°CExact

Transformation point Ac3820°CExact · Ac3(Acm)

Transformation point Ar3796°CExact · Ar3(Arcm)

Transformation point Ar1680°CExact

Weldabilityweldable with restrictionsAs published: limited weldability.

Flake sensitivitynot susceptibleAs published: not 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

5 conditions · 47 values

By delivery stateno delivery state statedsource splav

Delivery state	RmN/mm²	A5%	Z%	HB
Rolled stock cold-worked , GOST 1050-88	560	7	35	—
Rolled stock annealed , GOST 1050-88	440	17	45	—
Band annealed , GOST 2284-79	390 – 640	16	—	—
Band cold-worked , GOST 2284-79	640 – 930	—	—	—
Sheet GOST 4041-71	—	—	—	149
Rolled stock GOST 1050-88	—	—	—	229

By thicknessNormalizedsource steelnumber

Thicknessmm	RmN/mm²	A%
≤ 100	480	21
100 – 250	460	21

By dimensionno delivery state statedsource splav

Dimensionmm	RmN/mm²	A5%
4 - 14	430 – 590	24

By dimensionNormalizingsource splav

Dimensionmm	RmN/mm²	ReN/mm²	A5%	Z%
to 80	490	295	21	50

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)
20	7.85	200	—	52	—
100	—	196	12.1	51	470
200	—	191	12.9	49	483
300	—	185	13.6	46	546
400	—	—	14.2	43	563
500	—	—	14.7	39	764
600	—	164	15	36	—
700	—	—	15.2	32	—

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

Annealing

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.

C26D1.0415

Mn 0,50-0,80 · Si 0,10-0,30