20SiMn - GB /T 17107-1997

Grade	20SiMn
Corresponding Standard	GB /T 17107-1997 Structural Steel Grades And Mechanical Property For Forgings
Classification	Alloy Steel

20SiMn Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.16	0.6	1	-	-	-	-	-
Maximum Value	0.22	0.8	1.3	0.035	0.035	0.3	0.3	0.3

• High-quality steel——P≤0.035；S≤0.035；Cu≤0.3；Cr≤0.3；Ni≤0.3
• Extra-quality steel （Suffix A）——P≤0.025；S≤0.025；Cu≤0.25；Cr≤0.3；Ni≤0.3
• Special High-Quality Steel (Suffix E)——P≤0.025；S≤0.015；Cu≤0.25；Cr≤0.3；Ni≤0.3

20SiMn Mechanical Properties

diameter or thickness d mm	Mark	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Impact Energy Absorption KV2 J
d≤600	Sample Direction: Longitudinal	Normalizing + tempering	≥470	≥265	≥15	≥30	≥39
600＜d≤900	Sample Direction: Longitudinal	Normalizing + tempering	≥450	≥255	≥14	≥30	≥39
900＜d≤1200	Sample Direction: Longitudinal	Normalizing + tempering	≥440	≥245	≥14	≥30	≥39
d≤300	Sample Direction: tangential	Normalizing + tempering	≥490	≥275	≥14	≥30	≥27
300＜d≤500	Sample Direction: tangential	Normalizing + tempering	≥470	≥265	≥13	≥28	≥23
500＜d≤750	Sample Direction: tangential	Normalizing + tempering	≥440	≥245	≥11	≥24	≥19
750＜d≤1000	Sample Direction: tangential	Normalizing + tempering	≥410	≥225	≥10	≥22	≥19

• The forgings must be inspected for mechanical properties after performance heat treatment and before any surface treatment.
• After the samples are removed, no heat treatments that affect the mechanical properties or any processing that influences the test results shall be conducted.
• Mechanical property testing primarily evaluates the material\'s tensile strength, impact resistance, and hardness. When conducting tensile, impact, and hardness tests simultaneously, the hardness value is for reference only. Alternatively, one may choose to perform only one of the tensile, impact, or hardness tests.

20SiMn Corresponding Standards(Same grade name, different standards)

1	GB /T 17107-1997
	20SiMn
2	JB /T 6396-2006
	20SiMn

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!