J429 Grade 8 - SAE J429-2011

Grade	J429 Grade 8
Corresponding Standard	SAE J429-2011 Mechanical and Material Requirements for Externally Threaded Fasteners
Classification	Alloy Steel

J429 Grade 8 Chemical Element Composition Content (%)

	Component	C	P	S
中碳钢	Minimum Value	0.25	-	-
中碳钢	Maximum Value	0.55	0.025	0.025

	Component	C	Mn ^①	P	S	Cr ^①	Ni ^①	Mo ^①	V ^①	B
添加硼、铬、锰合金钢	Minimum Value	0.2	1.65	-	-	0.3	0.3	0.2	0.1	0.0005
添加硼、铬、锰合金钢	Maximum Value	0.55	-	0.025	0.025	-	-	-	-	0.003

	Component	C	Mn ^①	P	S	Cr ^①	Ni ^①	Mo ^①	V ^①
中碳合金钢	Minimum Value	0.28	1.65	-	-	0.3	0.3	0.2	0.1
中碳合金钢	Maximum Value	0.55	-	0.025	0.025	-	-	-	-

J429 Grade 8 Mechanical Properties

	Heat Treatment or Condition	Tensile Strength σ_b ksi	Yield Point σ_s ksi	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
Full-Size Specimen	Quenching and Tempering	≥150
Machined Specimen	Quenching and Tempering	≥150	≥130	≥12	≥35	（HRC） ≤58.6

Note: Full Size means a tension test specimen consisting of a completed fastener for testing in the ready to use condition without alteration

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