A573 Grade 70 A573 Grade 485 - ASTM A573/A573M-2025

Grade	A573 Grade 70
Other Names
Corresponding Standard	ASTM A573/A573M-2025 Standard Specification for Structural Carbon Steel Plates
Classification	Carbon Steel

A573 Grade 70 Chemical Element Composition Content (%)

	Component	C ^①	Si	Mn ^①	P	S	Al ^②
t≤ 13mm	Minimum Value	-	0.15	0.85	-	-	0.02
t≤ 13mm	Maximum Value	0.27	0.4	1.2	0.03	0.03	-

	Component	C ^①	Si	Mn ^①	P	S	Al ^②
13<t≤ 40mm	Minimum Value	-	0.15	0.85	-	-	0.02
13<t≤ 40mm	Maximum Value	0.28	0.4	1.2	0.03	0.03	-

* t=material thickness
① For each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage points above the specified maximum for manganese is permitted, up to a maximum of 1.60 % for Grades 70.
② Aluminum (total). Minimum aluminum content does not apply to plates with widths up to and including 15 in. [380 mm].

A573 Grade 70 Mechanical Properties

thickness t mm	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %
t≤40	485~620	≥290	Gauge length 200mm：≥18 Gauge length 50mm：≥21

* Elongation need not be determined for floor plate.
* For plates wider than 24 in. [600 mm], the elongation requirement is reduced two percentage points. See the Elongation Requirement Adjustments subsection in the Tension Tests section of Specification A6/A6M.

A573Grade70 Corresponding Standards(Same grade name, different standards)

1	ASTM A573/A573M-2013
	A573 Grade 70
2	ASTM A573/A573M-2025
	A573 Grade 70 A573 Grade 485

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