ASTM A618 HOLLOW SECTIONS

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ASTM A618 / A618M - 2015 Hot-Formed Welded and Seamless High-Strength Low-Alloy Structural Tubing

ASTM A618 / A618M covers grades of hot-formed welded and seamless high-strength low-alloy square, rectangular, round, or special shape structural tubing for welded, riveted, or bolted construction of bridges and buildings and for general structural purposes.

These grades are Grade Ia and Ib; Grade II; and Grade III.

ASTM A618 Chemical Requirements
Composition, %	Grade Ia		Grade Ib		Grade II		Grade III
Composition, %	Heat	Product	Heat	Product	Heat	Product	Heat	Product
Carbon, max	0.15	0.18	0.20	. . .	0.22	0.26	0.23A	0.27A
Manganese	1.00 max	1.04 max	1.35 max	1.40 max	0.85–1.25	1.30 max	1.35 max^A	1.40 max^A
Phosphorus, max	0.15	0.16	0.025	0.035	0.025	0.035	0.025	0.035
Sulfur, max	0.025	0.045	0.025	0.035	0.025	0.035	0.025	0.035
Silicon, max	. . .	. . .	. . .	. . .	0.30	0.33	0.30	0.35
Copper, min	0.20	0.18	0.20B	0.18B	0.20	0.18	. . .	. . .
Vanadium, min	. . .	. . .	. . .	. . .	0.02	0.01	0.02C	0.01
^AFor each reduction of 0.01 % C below the specified carbon maximum, an increase of 0.05 % manganese above the specified maximum will be permitted up to 1.45 % for the heat analysis and up to 1.50 % for the product analysis. ^BIf chromium and silicon contents are each 0.50 % min, then the copper minimums do not apply. ^C For Grade III, columbium may be used in conformance with the following limits: 0.005 %, min (heat) and 0.004 %, min (product).

ASTM A618 Tensile Requirements
	Grades la, lb, and ll				Grade lll
	Walls 3⁄4 in. [19.0 mm] and Under		Walls over 3⁄4 to 11⁄2 in. [19.0 to 38.0mm], incl
Tensile strength, min, ksi [MPa]A Yield strength, min, ksi [MPa]A Elongation in 2 in. or 50 mm, min, % Elongation in 8 in. or 200 mm, min, %	70 50 22 19	[485] [345]	67 46 22 18	[460] [315]	65 50 20 18	[450] [345]
^A For Grade II, when the material is normalized, the minimum yield strength and minimum tensile strength required shall be reduced by 5 ksi [35 MPa]

When the steel is used in welded construction, the welding procedure shall be suitable for the steel and the intended service.

The tubing shall be made by the seamless, furnace-buttwelded (continuous-welded), or hot-stretch-reduced electric-resistance-welded process.

Tensile test and bend test shall be performed for the material to conform to the requirements specified.

If the results of the mechanical tests representing any heat do not conform to a requirement, retests shall be made.

ASTM A618 High-Strength Low-Alloy Steel Tubing - Hot Forming A618 Tubing - ASTM A618 Grade 1 Seamless Pipes And Tubes - ASTM A618 Grade 2 Seamless Steel Tubes - ASTM A618 Grade 3 Steel Tubes - ASTM A618 Structural Steel Tubing - ASTM A618 Grade II Welded Pipes And Tubes - ASTM A618 Grade III Welded Steel Tubes

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EN 10219 STRUCTURAL HOLLOW SECTIONS