High Quality Steel Plate

A285Gr.A/B/C/D Steel Plate

A285Gr.A/B/C/D Steel Plate


Standard Specification for Pressure Vessel Plates, Carbon Steel, Low- and Intermediate-Tensile Strength


1. Scope

1.1 This specification2 covers carbon steel plates of lowland intermediate-tensile strengths which may be made by killed, semi-killed, capped, or rimmed steel practices at the producer’s option. These plates are intended for fusion-welded pressure vessels.

1.2 Plates under this specification are available in three grades having different strength levels as follows:



Tensile Strength, ksi (MPa)


45-65 (310-450)


50-70 (345-485)


55-75 (380-515)


1.3 The maximum thickness of plates under this specification, for reasons of internal soundness, is limited to a maximum thickness of 2 in. [50 mm] for all grades.

NOTE 1—For killed carbon steels only refer to the following ASTM specifications:3

A 299/A 299M Pressure Vessel Plates, Carbon Steel, Manganese-Silicon.

A 515/A 515M Pressure Vessel Plates, Carbon Steel, for Intermediate and

Higher-Temperature Service.

A 516/A 516M Pressure Vessel Plates, Carbon Steel, for Moderate- and

Lower-Temperature Service.

1.4 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 must be used independently of the other. Combining values from the

two systems may result in nonconformance with the specification.



2. General Requirements and Ordering Information

2.1 Material supplied to this material specification shall conform to Specification A 20/A 20M. These requirements outline the testing and retesting methods and procedures, permissible variations in dimensions and mass, quality and

repair of defects, marking, loading, etc.

2.2 Specification A 20/A 20M also establishes the rules for the ordering information that should be complied with when purchasing material to this specification.

2.3 In addition to the basic requirements of this specification, certain supplementary requirements are available when additional control testing or examination is required to meet end use requirements. The purchaser is referred to the listed supplementary requirements in this specification and to the detailed requirements in Specification A 20/A 20M.

2.4 If the requirements of this specification are in conflict with the requirements of Specification A 20/A 20M, the requirements of this specification shall prevail.



3. Heat Treatment

3.1 Plates are normally supplied in the as-rolled condition. The plates may be ordered normalized or stress relieved, or both.



4. Chemical Requirements

4.1 The steel shall conform to the requirements as to chemical composition as shown in Table 1.



5. Mechanical Requirements

5.1 Tension Tests:

5.1.1Requirements—The material as represented by the tension-test specimens shall conform to the requirements shown in Table 2.


Table 1 Chemical Composition


Composition %




Grade A

Grade B

Grade C

Carbon, maxA




Manganese, Max:




Heat Analysis




Product Analysis




Phosphorus, maxA




Sulphur, maxA





Table 2 Tensile Requirements


Grade A

Grade B

Grade C







Tensile strength







Yield Strength, minA







Elongation in 8 in. or (200 mm), min %B




Elongation in 2 in. or (50 mm), min %B





A:Determined by either the 0.2 % offset method or the 0.5 % extension-under-load method.

B:See Specification A 20/A 20M for elongation adjustment.


Supplementary Requirements

Supplementary requirements shall not apply unless specified in the order.

A list of standardized supplementary requirements for use at the option of the purchaser are included in Specification A 20/A 20M. Those which are considered suitable for use with this specification are listed below by title.


S3. Simulated Post-Weld Heat Treatment of Mechanical Test Coupons

S3.1 Prior to testing, the test coupons representing the plate for acceptance purposes for mechanical properties shall be thermally treated to simulate a post-weld heat treatment below the critical temperature (Ac3), using the heat treatment parameters (such as temperature range, time, and cooling rates)

specified in the purchase order. For tests using specimens taken from such heat treated test coupons, the test results shall meet the requirements of the applicable product specification.


S4. Additional Tension Test

S4.1 Other Than Quenched-and-Tempered Plates—In addition to the required single tension test, a second tension test shall be made using a test specimen taken from a test coupon taken from a corner of the plate-as-rolled on the end opposite the single test specimen and in a direction parallel to the single test specimen. The results obtained using this second test specimen shall meet the requirements of the applicable product specification.


S4.2 Quenched-and-Tempered Plates 2 in. [50 mm] or Greater in Thickness—In addition to the required tension tests, two additional test coupons shall be taken from the bottom corner of the plate. One shall be taken at the center of the plate thickness and the other immediately beneath the surface. Mandatory conformance of these additional tests with the specified properties shall be a matter of agreement between the manufacturer and the purchaser.


S14. Bend Test.

Additional Suplementary Requirements

Also listed below are additional optional supplementary requirements suitable for this specification:


S57. Copper-Bearing

S57.1 The copper content, by heat analysis shall be 0.20–0.35 % and by product analysis 0.18–0.37 %.


S58. Restricted Copper

S58.1 The maximum incidental copper content by heat analysis shall not exceed 0.25 %.


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