A572Gr42 A572Gr50 A572Gr55 A572Gr60 A572Gr65 A572Gr70 A572Gr75 A572Gr80 | SA-572/SA-572M-2025 | High-Strength Low-Alloy Columbium-Vanadium Structural Steel

1. Scope

1.1 This specification covers five grades of high-strength low-alloy structural steel shapes, plates, sheet piling, and bars. Grades 42 [290], 50 [345], and 55 [380] are intended for riveted, bolted, or welded structures. Grades 60 [415] and 65 [450] are intended for riveted or bolted construction of bridges, or for riveted, bolted, or welded construction in other applications.

1.2 For applications, such as welded bridge construction, where notch toughness is important, notch toughness requirements are to be negotiated between the purchaser and the producer.

1.3 Specification A588/A588M shall not be substituted for Specification A572/A572M without agreement between the purchaser and the supplier.

1.4 The use of columbium (niobium), vanadium, titanium, nitrogen, or combinations thereof, within the limitations noted in Section 5, is required; the selection of type (1, 2, 3, or 5) is at the option of the producer, unless otherwise specified by the purchaser. (See Supplementary Requirement S90.)

1.5 The maximum thickness available in the grades and products covered by this specification are shown in Table 1.

1.6 When the steel is to be welded, a welding procedure suitable for the grade of steel and intended use or service is to be utilized. See Appendix X3 of Specification A6/A6M for information on weldability.

1.7 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system is to be used independently of the other, without combining values in any way.

1.8 The text of this specification contains notes or footnotes, or both, that provide explanatory material. Such notes and footnotes, excluding those in tables and figures, do not contain any mandatory requirements.

1.9 For structural products produced from coil and furnished without heat treatment or with stress relieving only, the additional requirements, including additional testing requirements and the reporting of additional tests, of Specification A6/A6M apply.

1.10 This international standard was developed in accordance with internationally recognized principles and standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

2. Referenced Documents

2.1 ASTM Standards:

A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling
A36/A36M Specification for Carbon Structural Steel
A514/A514M Specification for High-Yield-Strength, Quenched and Tempered Alloy Steel Plate, Suitable for Welding
A588/A588M Specification for High-Strength Low-Alloy Structural Steel, up to 50 ksi [345 MPa] Minimum Yield Point, with Atmospheric Corrosion Resistance

3. General Requirements for Delivery

3.1 Structural products furnished under this specification shall conform to the requirements of the current edition of Specification A6/A6M, for the specific structural product ordered, unless a conflict exists in which case this specification shall prevail.

3.2 Coils are excluded from qualification to this specification until they are processed into a finished structural product. Structural products produced from coil means structural products that have been cut to individual lengths from a coil. The processor directly controls, or is responsible for, the operations involved in the processing of a coil into a finished structural product. Such operations include decoiling, leveling or straightening, hot-forming or cold-forming (if applicable), cutting to length, testing, inspection, conditioning, heat treatment (if applicable), packaging, marking, loading for shipment, and certification.

Note: For structural products produced from coil and furnished without heat treatment or with stress relieving only, two test rounds are to be reported for each qualifying coil. Additional requirements regarding structural products produced from coil are described in Specification A6/A6M.

4. Materials and Manufacture

4.1 The steel shall be killed.

5. Chemical Composition

5.1 The heat analysis shall conform to the requirements prescribed in Table 2 and Table 3.

5.2 The steel shall conform on product analysis to the requirements prescribed in Table 2 and Table 3, subject to the product analysis tolerances in Specification A6/A6M.

TABLE 1 Maximum Product Thickness or Size

TABLE 1 Maximum Product Thickness or Size
Grade	Yield Point, min ksi [MPa]	Maximum Thickness or Size
Grade	Yield Point, min ksi [MPa]	Plates and Bars in. [mm]	Structural Shapes Flange or Leg Thickness in. [mm]	Sheet Piling in. [mm]	Zees and Related Tees in. [mm]
42 [290]^A	42 [290]	6 [150]	all	all	all
50 [345]^A	50 [345]	4^B [100]^B	all	all	all
55 [380]	55 [380]	2-1/2 [64]	all	all	all
60 [415]^A	60 [415]	2-1/2^C [65]^C	2 [50]	all	all
65 [450]	65 [450]	2 [50]	2 [50]	all	all
^Ain the above tabulation, Grades 42, 50, and 60 [290, 345, and 415], are the yield point levels most closely aproximating a geomeiic progression patemn between 36 ksi [250 MPa], min, yield point steels covered by Soecificalion A36/A36M and 100 ksi [690 MPa] min. yieldield strength steels covered by Specitication A514/A514M. ^BRound bars up to and including 11 in.[275 mm] in diameter are permitted. ^CRound bars up to and including 3-1/2 in. [90 mm] in diameter are permitted.

TABLE 2 Chemical Requirements^A (Heat Analysis)

This table shows the chemical composition requirements for SA-572/SA-572M steel grades.

TABLE 2 Chemical Requirements^A (Heat Analysis)
Diameter, Thickness, or Distance Between Parallel Faces, in. [mm]	Structural Shape Flange or Leg Thickness, in. [mm]	Grade	Carbon, max, %	Manganese,^B max, %	Phosphorus, max, %	Sulfur, max, %	Silicon
	Structural Shape Flange or Leg Thickness, in. [mm]	Grade	Carbon, max, %	Manganese,^B max, %	Phosphorus, max, %	Sulfur, max, %	Plates to 1½ in. [40 mm] Thick, Shapes with Flange or Leg Thickness to 3 in. [75 mm] inclusive, Sheet Piling, Bars, Zees, and Rolled Tees^C	Plates Over 1½ in. [40 mm] Thick and Shapes with Flange Thickness Over 3 in. [75 mm]
6 [150]	all	42 [290]	0.21	1.35^D	0.030	0.030	0.40	0.15-0.40
4 [100]^E	all	50 [345]	0.23	1.35^D	0.030	0.030	0.40	0.15-0.40
2½ [64]^F	all	55 [380]	0.25	1.35^D	0.030	0.030	0.40	0.15-0.40
2½ [64]^F	≤2 [50]	60 [415]	0.26	1.35^D	0.030	0.030	0.40	0.15-0.40
>½ - 2 [13-50]	1-2 [25-50]	65 [450]	0.23	1.65	0.030	0.030	0.40	0.15-0.40
≤½ [13]^H	≤1	65[450]	0.26	1.35^D	0.030	0.030	0.40	G
Footnotes: ^A Copper when specified shall have a minimum content of 0.20 % by heat analysis (0.18 % by product analysis). ^B Manganese, minimum, by heat analysis of 0.80 % (0.75 % by product analysis) shall be required for all plates over 3/8 in. [10 mm] in thickness; a minimum of 0.50 % (0.45 % by product analysis) shall be required for plates 3/8 in. [10 mm] and less in thickness, and for all other products. The manganese to carbon ratio shall not be less than 2 to 1. ^C Bars over 1½ in. [40 mm] in diameter, thickness, or distance between parallel faces shall be made by a killed steel practice. ^D For each reduction of 0.01 percentage point below the specified carbon maximum, an increase of 0.06 percentage point manganese above the specified maximum is permitted, up to a maximum of 1.60 %. ^E Round bars up to and including 11 in. [275 mm] in diameter are permitted. ^F Round bars up to and including 3½ in. [90 mm] in diameter are permitted. ^G The size and grade is not described in this specification. ^H An alternative chemical requirement with a maximum carbon of 0.21 % and a maximum manganese of 1.65 % is permitted, with the balance of the elements as shown in Table 2. ^I A maximum phosphorus content of 0.04 % and a maximum sulfur content of 0.05 % are permitted for the following materials: Structural shapes Sheet piling Bars Plates with widths up to and including 15 in. [380 mm]

TABLE 3 Alloy Content

TABLE 3 Alloy Content
Type^A	Elements	Heat Analysis, %
1	Columbium/niobium^E	0.005–0.05^B
2	Vanadium	0.01–0.15^C
3	Columbium/niobium^E Vanadium Columbium/niobium^Eplus vanadium	0.005–0.05^B 0.01–0.15^C 0.02–0.15^D
5	Titanium Nitrogen Vanadium	0.006–0.04 0.003-0.015 0.06 max
^AAlloy content shall be in accordance with Type 1, 2, 3, or 5 and the contents ofthe applicable elements shall be reported on the test report. ^BProduct analysis limits = 0.004 to 0.06 %. ^C Product analysis limits =0,005 to 0.17. ^DProduct analysis limits = 0.01 to 0.16 %. ^EColumbium and niobium are interchangeable names for the same element andboth names are acceptable for use in Committee A01 specificatlons.

6. Mechanical Properties

6.1 Tensile Properties:

6.1.1 The material as represented by the test specimens shall conform to the tensile properties given in Table 4.

TABLE 4 Tensile Requirements*

TABLE 4 Tensile Requirements*
Grade	Yield Point, min ksi [MPa]	Tensile Strength, min ksi [MPa]	Minimum Elongation, % in 8 in. [200 mm]	Minimum Elongation, % in 2 in. [50 mm]
42 [290]	42 [290]	60 [415]	20	24
50 [345]	50 [345]	65 [450]	18	21
55 [380]	55 [380]	70 [485]	17	20
60 [415]	60 [415]	75 [520]	16	18
65 [450]	65 [450]	80 [550]	15	17
^A See specimen orientation under the Tensile Tests section of Specification A6/A6M. ^B Elongation not required to be determined for floor plate. ^C For wide flange shapes over 426 lb/ft [634 kg/m], elongation in 2 in. [50 mm] of 19% minimum applies. ^D For plates wider than 24 in. [600 mm], the elongation requirement is reduced two percentage points for Grades 42, 50, and 55 [290, 345, and 380], and three percentage points for Grades 60 and 65 [415 and 450]. See elongation requirements adjustments in the Tensile Tests section of Specification A6/A6M.

6.2 Hardness:

Hardness requirements, when specified, shall be in accordance with Supplementary Requirement S92 of Specification A6/A6M.

7. Keywords

7.1 bars; bolted construction; bridges; buildings; columbium; columbium-vanadium; high-strength; low-alloy; plates; riveted construction; shapes; sheet piling; steel; structural steel; welded construction

SUPPLEMENTARY REQUIREMENTS

Supplementary requirements shall not apply unless specified in the order or contract. Standardized supplementary requirements for use at the option of the purchaser are listed in Specification A6/A6M. Those that are considered suitable for use with this specification are listed by title:

S5. Charpy V-Notch Impact Test.
S18. Maximum Tensile Strength
S30. Charpy V-Notch Impact Test for Structural Shapes: Alternate Core Location
S32. Single Heat Bundles.

In addition, the following supplementary requirements are suitable for use:

S81. Tensile Strength

S81.1 For Grade 50 [345] steel of thicknesses ½ in. [20 mm] and less, the tensile strength shall be a minimum of 70 ksi [485 MPa].

S90. Type

S90.1 The specific type of steel shall be as specified by the purchaser in the order or contract.

S99. Interlock Strength

S99.1 The minimum strength of the interlocked joint required for certain services may be specified for straight web (PS type) and arched web (PSA type) sheet piling sections subject to specific agreement between the material purchaser and the manufacturer.

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SPECIFICATION FOR HIGH-STRENGTH LOW-ALLOY COLUMBIUM-VANADIUM STRUCTURAL STEEL

1. Scope