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Grade 10S20
Germany W-Nr. 1.0721
Corresponding Standard DIN 1651-1988
Free-Cutting Steels Technical Delivery Conditions
Classification Carbon Steel
Properties Machinability Carburizing Ability
10S20 Chemical Element Composition Content (%)
Component C Si Mn P S
Minimum Value 0.07 0.1 0.7 - 0.18
Maximum Value 0.1 0.3 1.1 0.06 0.25
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.
10S20 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
Bar, semi-finished product, wire; t ≤ 10 Hot Work (U) or Hot Work and Peeling (U+SH) 360~530 ≤159
Bar, semi-finished products, wire rod; 10 < t ≤ 16 Hot Work (U) or Hot Work and Peeling (U+SH) 360~530 ≤159
Bar, semi-finished products, wire rod; 16 < t ≤ 40 Hot Work (U) or Hot Work and Peeling (U+SH) 360~530 ≤149
Bar, semi-finished products, wire rod; 40 < t ≤ 63 Hot Work (U) or Hot Work and Peeling (U+SH) 360~530 ≤149
Bar, semi-finished products, wire rod; 63 < t ≤ 100 Hot Work (U) or Hot Work and Peeling (U+SH) 350~490 ≤146
Bar, semi-finished product, wire; t ≤ 10 Cold Drawing (K) 540~780 ≥410 ≥7
Bars, semi-finished products, wire rods; 10<d≤16 Cold Drawing (K) 490~740 ≥390 ≥8
Bars, semi-finished products, wire rods; 16<d≤40 Cold Drawing (K) **
460~710		 *
≥355		 ≥9
Bars, semifinished products, wire; 40<d≤63 Cold Drawing (K) 390~640 ≥295 ≥10
Bars, semi-finished products, wire rod; 63<d≤100 Cold Drawing (K) 360~610 ≥235 ≥11
Bar, Semi-finished, Wire; d≤100 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
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Russia
GB ISC CNS JIS KS ASTM/AISI ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST
Y12 U71122 SUM21 SUM21 SUM21 B1112
1211① 		10S20 10S20 1.0721 13MF4 10S20① 1.0721 А12
2 Approximate Comparison Table Free-Cutting Structural Steel
United States International Organization for Standardization Germany France United Kingdom
ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF BS EN/BS
1108 G11080 10S20 10S20 1.0721 (10F1) 210M15
3 Approximate Comparison Table Free-Cutting Structural Steel
China United States Germany France European Standard Sweden United Kingdom
GB ASTM DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade SS BS EN/BS
Y12 Gr.1108 10S20 1.0721 10F1 10S20 1.0721 1912 210M15
10S20 Corresponding Standards(Same grade name, different standards)
1 ISO 683-9-1988
10S20 Type 4
2 EN 10087-1999
10S20 1.0721
3 EN 10277-3-1999
10S20 1.0721
4 DIN 1651-1988
10S20 1.0721
5 DIN EN ISO 683-4-2018
10S20
6 ISO 683-4-2016
10S20
7 ISO 683-18-2014
10S20
8 EN 10277-2018
10S20 1.0721
9 NF EN 10087-1999
10S20 1.0721

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