ASTM A595 / A595M

This specification covers three grades of seam-welded,round, tapered steel tubes for structural use. GradesAand B are of low-carbon steel or high-strength low-alloy steel composition and Grade C is of weather-resistant steel composition. The product may be modified from its round cross section into other shapes without subsequent retesting.This tubing is produced in welded sizes in a range ofdiameters from 2 3⁄8 to 30 in. [60 to 762 mm] inclusive. Wall thicknesses range from 0.1046 to 0.375 in. [2.66 to 9.53 mm].Tapers are subject to agreement with the manufacturer.

Chemical Properties

Grades	Descriptions
Grade A	-
Grade B	-
Grade C	-

Chemical Properties

Grade A
Elements	Carbon Steel	HSLA SS	HSLAS Cl1	HSLAS Cl2
Carbon	0.15–0.25	0.25 max	0.23 max	0.15 max
Manganese	0.30–0.90	1.35 max	1.35 max	1.35 max
Phosphorus	0.035 max	0.035 max	0.04 max	0.04 max
Sulfur	0.035 max	0.04 max	0.04 max	0.04 max
Silicon	0.060 maxB	0.060 maxB	0.060 maxB	0.060 maxB
Copper	...	0.20 max	0.20 max	0.20 max
Chromium	...	0.15 max	0.15 max	0.15 max
Nickel	...	0.20 max	0.20 max	0.20 max
Molybdenum	...	0.06 max	0.06 max	0.06 max
Vanadium	...	0.008 max	0.01 min	0.01 min
Columbium	...	0.008 max	0.005 min	0.005 min
Nitrogen	...	A	A	A
Aluminum	A	A	A	A

Grade B
Elements	Carbon Steel	HSLA SS	HSLAS Cl1	HSLAS Cl2
Carbon	0.15–0.25	0.25 max	0.26 max	0.15 max
Manganese	0.40–1.35	1.35 max	1.50 max	1.50 max
Phosphorus	0.035 max	0.035 max	0.04 max	0.04 max
Sulfur	0.035 max	0.04 max	0.04 max	0.04 max
Silicon	0.060 maxB	0.060 maxB	0.060 maxB	0.060 maxB
Copper	...	0.20 max	0.20 max	0.20 max
Chromium	...	0.15 max	0.15 max	0.15 max
Nickel	...	0.20 max	0.20 max	0.20 max
Molybdenum	...	0.06 max	0.06 max	0.06 max
Vanadium	...	0.008 max	0.01 min	0.01 min
Columbium	...	0.008 max	0.005 min	0.005 min
Nitrogen	...	A	A	A
Aluminum	A	A	A	A

Grade C
Elements	A 606	A 588/A	A 588/B	A 588/C	A 588/K
Carbon	0.22 max	0.19 max	0.20 max	0.15 max	0.17 max
Manganese	1.25 max	0.80–1.25	0.75–1.35	0.80–1.35	0.50–1.20
Phosphorus	A	0.04 max	0.04 max	0.04 max	0.04 max
Sulfur	0.04 max	0.05 max	0.05 max	0.05 max	0.05 max
Silicon	A	0.30–0.65	0.15–0.50	0.15–0.40	0.25–0.50
CopperC,D	A	0.25–0.40	0.20–0.40	0.20–0.50	0.30–0.50
ChromiumC,E	A	0.40–0.65	0.40–0.70	0.30–0.50	0.40–0.70
Nickel	A	0.40 max	0.50 max	0.25–0.50	0.40 max
MolybdenumC,E	...	A	A	A	0.10 max
VanadiumF	...	0.02–0.10	0.01–0.10	0.01–0.10	A
ColumbiumF	...	A	A	A	0.005–0.05
Nitrogen	...	...	...	...	...
AluminumB	...	...	...	...	...

Note:
AThere is no limit; however, the analysis shall be reported.
B Silicon or silicon in combination with aluminum must be sufficient to ensure uniform mechanical properties. Their sum shall be greater than or equal to 0.020 %.
C For HSLA steels the sum of copper, nickel, chromium, and molybdenum shall not exceed 0.50 % on heat analysis. When one of these elements are specified by the purchaser, the sum does not apply, in which case only the individual limits of the remaining elements shall apply.
D For HSLA steels when copper is specified, the copper limit is a minimum requirement. When copper steel is not specified, the copper limit is a maximum requirement.
E For SS steel the sum of chromium and molybdenum shall not exceed 0.16 % on heat analysis. When one or more of these elements are specified by the purchaser, the sum does not apply, in which case the individual limit on the remaining unspecified element shall apply.
F For HSLA steels vanadium and columbium minimums may be satisfied separately or by combining their values, in which event the sum shall exceed the combined minimums.

Mechanical Properties

Grade	Yield point, min, ksi [MPa]	Ultimate tensile strength, min, ksi [MPa]	Elongation in 2 in. [50 mm], min %
Grade A	55 [380]	65 [450]	23
Grade B	60 [410]	70 [480]	21
Grade C	60 [410]	70 [480]	21

Note A:Elongation of Grade 11 is for all walls and for small sizes tested in full section.

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