21B3 - NF A 35-557-1983

21B3 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	B
Minimum Value	0.18	0.1	0.6	-	-	0.0008
Maximum Value	0.24	0.4	0.9	0.035	0.035	0.005

21B3 Mechanical Properties

condition	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW	Impact Energy Absorption KV2 J
Bar, Coil; d=9	Oil Quenching	-	-	-	HRC38	-
Bar, Coil; d≤9	Quenching and Tempering	760~910	≥600	≥13	-	≥100

21B3 Corresponding Standards(Same grade name, different standards)

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