45S20 1.0727 - DIN 1651-1988

Grade	45S20
Germany W-Nr.	1.0727
Corresponding Standard	DIN 1651-1988 Free-cutting steels technical delivery conditions
Classification	Carbon Steel
Properties	Machinability Quench Hardness

45S20 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S
Minimum Value	0.42	0.1	0.7	-	0.18
Maximum Value	0.5	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.

45S20 Mechanical Properties

condition	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s 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)	590~760			≤229
Bar, semi-finished products, wire rod; 10 < t ≤ 16	Hot Work (U) or Hot Work and Peeling (U+SH)	590~760			≤229
Bar, semi-finished products, wire rod; 16 < t ≤ 40	Hot Work (U) or Hot Work and Peeling (U+SH)	590~760			≤223
Bar, semi-finished products, wire rod; 40 < t ≤ 63	Hot Work (U) or Hot Work and Peeling (U+SH)	590~740			≤223
Bar, semi-finished products, wire rod; 63 < t ≤ 100	Hot Work (U) or Hot Work and Peeling (U+SH)	580~730			≤217
Bar, semi-finished product, wire; t ≤ 10	Cold Drawing (K)	740~980	≥570	≥5
Bars, semi-finished products, wire rods; 10<d≤16	Cold Drawing (K)	690~930	≥470	≥6
Bars, semi-finished products, wire rods; 16<d≤40	Cold Drawing (K)	640~830	≥375	≥7
Bars, semifinished products, wire; 40<d≤63	Cold Drawing (K)	610~800	≥325	≥8
Bars, semi-finished products, wire rod; 63<d≤100	Cold Drawing (K)	580~770	≥305	≥9
Bar, Semi-finished, Wire; d≤63	Cold Drawn and Stress Relief (K+S)	≤750
Bar, semi-finished product, wire; t ≤ 10	Pickled and Tempered (SH+V) or Cold Drawn and Tempered (K+V)	700~840	≥480	≥10
Bars, semi-finished products, wire rods; 10<d≤16	Pickled and Tempered (SH+V) or Cold Drawn and Tempered (K+V)	700~840	≥480	≥11
Bars, semi-finished products, wire rods; 16<d≤40	Pickled and Tempered (SH+V) or Cold Drawn and Tempered (K+V)	660~800	≥410	≥13
Bars, semifinished products, wire; 40<d≤63	Pickled and Tempered (SH+V) or Cold Drawn and Tempered (K+V)	620~760	≥375	≥14

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

China	United States		International Organization for Standardization	Germany		France	European Standard		Sweden	United Kingdom
GB	ASTM/AISI	UNS	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	EN	Numerical Grade	SS₁₄	BS EN/BS
Y45	1146	G11460	46S20	45S20	1.0727	45MF4	46SMn20	1.0727	1973	212M44

2 Approximate Comparison Table

International Organization for Standardization	Germany	European Standard
ISO	DIN EN/DIN	EN	Numerical Grade
46S20	45S20	46S20	1.0727

45S20 Corresponding Standards(Same grade name, different standards)

1	DIN 1651-1988
	45S20 1.0727
2	EU 87(1970)
	45 S 20

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