Technical requirement for ASTM A709 carbon and high-strength low alloy steel

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Technical requirement for ASTM A709 carbon and high-strength low alloy steel

Posted:2020-04-24 11:28:04

Technical requirement for ASTM A709 carbon and high-strength low alloy steel
As for the technical requirement for ASTM A709 carbon and high-strength low alloy steel like chemical requirement and mechanical properties, please take a look of the following tables. There are the detailed info for ASTM A709 Grades 36, 50, 50S, HPS 50W and HPS 70W.

ASTM A709 steel chemical composition (%)

Elements	Grade 36	Grade 50	Grade 50S	Grade HPS 50W	Grade HPS 70W
Carbon, max	0.26	0.23	0.23	0.11	0.11
Manganese, max.	-	1.35	0.50-1.60	1.10-1.35	1.10-1.35
Phosphorous,max	0.040	0.03	0.035	0.020	0.020
Sulfur,max	0.050	0.030	0.045	0.006	0.006
Silicon	0.40 max.	0.40 max.	0.40 max.	0.30-0.50	0.30-0.50
Copper	0.20	-	0.6	0.25-0.40	0.25-0.40
Columbium	-	0.005-0.05	0.05 max	-	-
Vanadium	-	-	0.15 max	0.04-0.08	0.04-0.08
Nickel	-	-	0.45 max	0.25-0.40	0.25-0.40
Chromium	-	-	0.35 max	0.45-0.70	0.45-0.70
Molybdenum	-	-	0.15 max	0.02-0.08	0.02-0.08
Aluminum	-	-	-	0.010-0.040	0.010-0.040
Nitrogen	-	-	-	0.015 max	0.015 max

ASTM A709 steel mechanical properties

Grade	Thickness mm	Yield strength, min, kis [MPa]	Tensile strength Mpa min	Elongation in 8 in. [200 mm], min, %	Elongation in 2 in. [50 mm], min, %
A709 Grade 36	≤100	36[250]	58-80[400-550]	20	23
A709 Grade 50	≤100	50[345]	65[450]	18	21
A709 Grade 50S	-	50[345]	65[450]	-	-
A709 Grade 50W	≤100	50[345]	70[485]	18	21
A709 Grade HPS 50W	≤100	50[345]	70[485]	18	21

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