UNI · Italy · 71 designations

20Mn7

20Mn7 is a designation in UNI for the material held under material number 1.1133, also listed as 20Mn5. It is a material in the category Quenched and tempered steels. We list 71 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, SS, ČSN, STN, PN, MSZ, AS / NZS, BDS, SNV and KS.

Material no. 1.1133
Category Quenched and tempered steels · 133 grades
Designations 71

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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

71 designations · 21 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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

20Mn5This grade’s own name

UNSUnited States · 3

AISI / SAEUnited States · 12

ASTMUnited States · 4

BSUnited Kingdom · 5

AFNORFrance · 2

UNESpain · 4

ISOInternational · 2

JISJapan · 4

GBChina · 4

GOSTRussia / CIS · 15

UNIItaly · 2

20Mn7Indicative
G22Mn3Indicative

SSSweden · 1

2132Indicative

ČSNCzechia · 4

STNSlovakia · 1

13 030Indicative

PNPoland · 2

MSZHungary · 1

Ao20Mn5Indicative

AS / NZSAustralia / New Zealand · 1

1022Indicative

BDSBulgaria · 1

20GIndicative

SNVSwitzerland · 1

20Mn5Indicative

KSSouth Korea · 1

SMnC420Indicative

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

Chemical composition

9 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 97.2 %Mn — 1.3 %Si — 0.4 %Cr — 0.4 %Traces & impurities · 0.8 %

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

Element	% by weight
	0.17–0.23
	≤ 0.4
	1–1.5
	0.035
	0.035
	≤ 0.4
	≤ 0.1
	≤ 0.4
	≥ 0.02

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	0,17-0,23	0.170	0.230	Range
Al	≥0,020	0.020	—	Min
Si	≤0,40	—	0.400	Max
P	0,035	0.035	0.035	Exact
S	0,035	0.035	0.035	Exact
Cr	≤0,40	—	0.400	Max
Mn	1,00-1,50	1.000	1.500	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 Ae3802°C

Predicted Ae1714°C

Predicted Acm464°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 Ac1724°CExact

Transformation point Ac3845°CExact · Ac3(Acm)

Transformation point Ar3815°CExact · Ar3(Arcm)

Transformation point Ar1682°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

6 conditions · 87 values

By thicknessNormalizedsource steelnumber

Thicknessmm	RmN/mm²
≤ 100	530
100 – 250	520
250 – 500	500
500 – 750	490

By dimensionno delivery state statedsource caishuku

Specimen sizemm	RmN/mm²	ReN/mm²	A%	HB
15 – 15	≥ 785	≥ 590	≥ 10	≤ 187

By dimensionNormalizing 940 - 960°C,Drawing 630 - 650°C,Cooling air, 65°C/hsource splav

Dimensionmm	RmN/mm²	KCUkJ/m²
60 - 90	440	600

By delivery stateno delivery state statedsource splav

Delivery state	RmN/mm²	ReN/mm²	A5%	KCUkJ/m²
Sheet, GOST 5520-79	430 – 590	255 – 265	22	590

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	7.859	211	—	51.7	—	173
100	7.834	208	11.75	51	470	219
200	7.803	205	12.2	48.5	483	292
300	7.77	200	12.8	44.4	—	381
400	7.736	191	13.2	42.7	525	487
500	7.699	180	13.5	39.3	571	601
600	7.659	165	13.85	35.6	—	758
700	7.617	—	14.6	31.9	—	925
800	7.624	—	12.7	25.9	—	1094
900	7.6	—	12.4	26.4	—	1135
1000	7.548	—	13.4	27.7	—	1167
1100	7.496	—	14.2	28.5	—	1194
1200	—	—	14.8	29.8	—	1219

At temperatureno delivery state statedsource caishuku

Temperature°C	Elastic modulusGPa	Thermal expansion coefficient10^-6/K	Thermal conductivityW/(m·K)	Specific heat capacityJ/(kg·K)
20	210	—	—	—
100	—	—	40.06	—
200	—	12.1	—	—
300	185	—	42.29	—
400	175	13.5	—	—
500	—	—	37.26	—
600	—	14.1	—	—
700	—	—	30.98	—
900	—	—	—	586
1100	—	—	—	620

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

GB /T 5310-2023

Single operation

Normalizing880–940 °C

Supply condition

Quenching and TemperingTest specimen sizet=15
Quenching
Carburizing
Normalizing

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 1.1, 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.

26Mn51.1161

Mn 1,20-1,50 · Si ≤0,40