Grade 9SMn 28
Germany W-Nr. 1.0715
Corresponding Standard DIN 1651-1988
Free-Cutting Steels Technical Delivery Conditions
Classification Alloy Steel
Properties Machinability
9SMn 28 Chemical Element Composition Content (%)
Component C Si Mn P * S
Minimum Value - - 0.9 - 0.27
Maximum Value 0.14 0.05 1.3 0.1 0.33
①Elements not listed in the table (except for finishing the cast) shall not be intentionally add to the steel. Such introduction may only be agreed upon with the customer if it can be demonstrated to improve machinability.
9SMn 28 Mechanical Properties
condition Mark
Heat Treatment or Condition
Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
Hardness
HBW
Bars, semi-finished products, wire; t<10 9SMn 28 U/U+SH Hot Working (U) or Hot Working + Descaling (U+SH) 380~570 ≤170
Bars, semi-finished products, wire; 10≤t<16 Hot Working (U) or Hot Working + Descaling (U+SH) 380~570 ≤170
Bars, semi-finished products, wire; 16≤t<40 Hot Working (U) or Hot Working + Descaling (U+SH) 380~570 ≤159
Bars, semi-finished products, wire; 40≤t<63 Hot Working (U) or Hot Working + Descaling (U+SH) 380~570 ≤159
Bars, semi-finished products, wire; 63≤t<100 Hot Working (U) or Hot Working + Descaling (U+SH) 360~520 ≤156
Bars, semi-finished products, wire; t<10 9SMn 28 K Cold Drawing (K) 560~810 ≥440 ≥6
Bars, semi-finished products, wire; 10≤t<16 Cold Drawing (K) 510~760 ≥410 ≥7
Bars, semi-finished products, wire; 16≤t<40 Cold Drawing (K) 460~710 ≥375 ≥8
Bars, semi-finished products, wire; 40≤t<63 Cold Drawing (K) 410~660 ≥305 ≥9
Bars, semi-finished products, wire; 63≤t<100 Cold Drawing (K) 380~630 ≥245 ≥10
Bar, Semi-finished, Wire; t≤100 9SMn 28 K+S Cold Drawn and Stress Relief (K+S) ≤550
①A structure is usually defined first, followed by heat treatment (e.g., K+V). When the sequence is reversed, especially for steels such as 45S20, 45SPb20, and 60SPb20, the values to be complied with must be agreed upon.
②The minimum transverse elongation in a tensile test applies to steels 9Mn28, 9SMnPb28, 15S10, 10S20, and 10SPb20 in structural or heat-treated states U+SH and K+S.
③Round bars exceeding 50mm in diameter are generally supplied in a peeled condition rather than cold-drawn.
New and Old Grade Replacement List
Corresponding Standard Grade
DIN 1651-1988
Grade
Germany W-Nr.
DIN EN ISO 683-4-2018
Grade
1 Approximate Comparison Table Free-Cutting Structural Steel
Taiwan, China Japan South Korea United States Germany France Sweden United Kingdom
CNS JIS KS ASTM/AISI UNS DIN EN/DIN W-Nr. NF EN/NF SS14 BS EN/BS
SUM22 SUM22 SUM22 1213 G12130 9SMn28 1.0715 S250 1912 230M07
2 Approximate Comparison Table Free-Cutting Structural Steel
China Japan United States International Organization for Standardization Germany France European Standard
GB JIS SAE ISO DIN EN/DIN NF EN/NF EN Numerical Grade
Y15 SUM22 1215 11SMn30 9SMn28 S250 11SMn30 1.0715
3 Approximate Comparison Table Structural Alloy Steel
China Germany
GB DIN EN/DIN
10MnS 9SMn28

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