A858 - ASTM A858/A858M-2024

Grade	A858
Corresponding Standard	ASTM A858/A858M-2024 Standard Specification for Heat-Treated Carbon Steel Fittings for Low-Temperature and Corrosive Service
Classification	Carbon Steel

A858 Chemical Element Composition Content (%)

Component	C	Si ^①	Mn	P	S	Cr	Ni	Cu	Mo	More
Minimum Value	-	0.15	0.9	-	-	-	-	-	-	Ni+Cr+Mo+Cu ≤ 1.0
Maximum Value	0.2	0.4	1.35	0.03	0.01	0.3	0.5	0.35	0.2	Ni+Cr+Mo+Cu ≤ 1.0

① When vacuum carbon deoxldation is used, the silicon shall be 0.10 % maximum, and on product analysis shall not exceed 0.12 %.

A858 Mechanical Properties

condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Impact Energy Absorption KV2 J
	485~655	≥250	Rectangular specimen, for section thickness ≥ 7.94 mm ： ≥30	round specimen only ≥40
Specimen size, mm: 10×10					Average/min: 27/22
Specimen size, mm: 10×7.5					Average/min: 23/18
Specimen size, mm: 10×15					Average/min: 18/15

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