9SMnPb28 1.0718 - DIN 1651-1988

Grade	9SMnPb28
Germany W-Nr.	1.0718
Corresponding Standard	DIN 1651-1988 Free-cutting steels technical delivery conditions
Classification	Alloy Steel
Properties	Machinability

9SMnPb28 Chemical Element Composition Content (%)

Component	C	Si	Mn	P ^*	S	Pb
Minimum Value	-	-	0.9	-	0.27	0.15
Maximum Value	0.14	0.05	1.3	0.1	0.33	0.35

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.

9SMnPb28 Mechanical Properties

condition	Mark	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW
Bars, semi-finished products, wire; t＜10	9SMnPb28 U/U+SH	Hot Working (U) or Hot Working + Descaling (U+SH)	380~570			≤170
Bars, semi-finished products, wire; 10≤t<16	9SMnPb28 U/U+SH	Hot Working (U) or Hot Working + Descaling (U+SH)	380~570			≤170
Bars, semi-finished products, wire; 16≤t<40	9SMnPb28 U/U+SH	Hot Working (U) or Hot Working + Descaling (U+SH)	380~570			≤159
Bars, semi-finished products, wire; 40≤t<63	9SMnPb28 U/U+SH	Hot Working (U) or Hot Working + Descaling (U+SH)	380~570			≤159
Bars, semi-finished products, wire; 63≤t＜100	9SMnPb28 U/U+SH	Hot Working (U) or Hot Working + Descaling (U+SH)	360~520			≤156
Bars, semi-finished products, wire; t＜10	9SMnPb28 K	Cold Drawing (K)	560~810	≥440	≥6
Bars, semi-finished products, wire; 10≤t<16	9SMnPb28 K	Cold Drawing (K)	510~760	≥410	≥7
Bars, semi-finished products, wire; 16≤t<40	9SMnPb28 K	Cold Drawing (K)	460~710	≥375	≥8
Bars, semi-finished products, wire; 40≤t<63	9SMnPb28 K	Cold Drawing (K)	410~660	≥305	≥9
Bars, semi-finished products, wire; 63≤t＜100	9SMnPb28 K	Cold Drawing (K)	380~630	≥245	≥10
Bar, Semi-finished, Wire; t≤100	9SMnPb28 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

China		Taiwan, China	Japan	South Korea	United States		International Organization for Standardization	Germany		France	Sweden
GB	ISC	CNS	JIS	KS	ASTM/AISI	UNS	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	SS₁₄
Y15Pb	U72152	SUM22L	SUM22L	SUM22L	12L13	G12134	11SMnPb28	9SMnPb28	1.0718	S250Pb	1914

2 Approximate Comparison Table Free-Cutting Structural Steel

Japan	United States	International Organization for Standardization	Germany	France	European Standard
JIS	SAE	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade
SUM22L	12L15	11SMnPb30	9SMnPb28	S250Pb	11SMnPb30	1.0718

9SMnPb28 Corresponding Standards(Same grade name, different standards)

1	EN 10087-1999
	9SMnPb28 1.0718
2	DIN 1651-1988
	9SMnPb28 1.0718

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