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Grade 44SMn28
Corresponding Standard ISO 683-4-2016
Heat-Treatable Steels,Alloy Steels and Free-Cutting Steels--Part 4: Free-Cutting Steels
Classification Alloy Steel
Properties Machinability Quench Hardness
44SMn28 Chemical Element Composition Content (%)
Component C Si Mn P S
Minimum Value 0.4 - 1.3 - 0.24
Maximum Value 0.48 0.4 1.7 0.06 0.33
①Elements not quoted shall not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast. All reasonable precautions are to be taken to avoid the addition of such elements from scrap and other materials used in manufacture which affect the mechanical properties and the suitability. However, if agreed, the manufacturer can add elements such as Ca, Se,Te, etc. for the purpose of improving the machinability. These elements have to be reported in the inspection document.
44SMn28 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
5<d≤10 Untreated (U) 630~900 ≤266
10<d≤16 Untreated (U) 630~850 ≤252
16<d≤40 Untreated (U) 630~820 ≤241
40<d≤63 Untreated (U) 620~790 ≤231
63<d≤100 Untreated (U) 610~780 ≤228
5<d≤10 Quenching and Tempering 700~850 ≥520 ≥16
10<d≤16 Quenching and Tempering 700~850 ≥480 ≥16
16<d≤40 Quenching and Tempering 700~850 ≥420 ≥16
40<d≤63 Quenching and Tempering 700~850 ≥410 ≥16
63<d≤100 Quenching and Tempering 700~850 ≥400 ≥16
1 Approximate Comparison Table Free-Cutting Structural Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization France European Standard Russia United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS SAE ISO NF EN/NF EN Numerical Grade GOST BS EN/BS
Y40Mn
Y45Mn 		L20409 SUM42 SUM42
SUM43 		SUM42 1141 G11410 SAE 1144 44SMn28 40M5 44SMn28 1.0762 А10Г 212M44
2 Approximate Comparison Table Free-Cutting Structural Steel
China International Organization for Standardization European Standard Russia
GB ISO EN Numerical Grade GOST
Y40Mn 44SMn28 44SMn28 1.0762 A40G
А40Г
3 Approximate Comparison Table Free-Cutting Structural Steel
China Japan United States International Organization for Standardization Germany France European Standard Russia United Kingdom
GB JIS ASTM ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
Y40Mn SUM42 1141
1139 		44SMn28
35SMn20 		38SMn28 1.0760 38SMn28 38SMn28 1.0760 A40Г 38SMn28
4 Approximate Comparison Table
China Japan United States International Organization for Standardization
GB JIS ASTM ISO
Y45MnS SUM43 1144 44SMn28
44SMn28 Corresponding Standards(Same grade name, different standards)
1 ISO 683-9-1988
44SMn28
2 EN 10277-3-1999
44SMn28 1.0762
3 DIN EN ISO 683-4-2018
44SMn28
4 ISO 683-4-2016
44SMn28
5 ISO 683-18-2014
44SMn28
6 EN 10277-2018
44SMn28 1.0762
7 NF EN 10087-1999
44SMn28 1.0762

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