98

SPECIFICATION FOR PRESSURE VESSEL PLATES,CARBON STEEL,

LOW- AND INTERMEDIATE-TENSILE STRENGTH

SA-285/SA-285M

(Identical with ASTM Specification A 285/A 285M-90)

1. Scope

1.1 This specification covers carbon steel plates oflow- and intermediate-tensile strengths which may bemade by killed, semi-killed, capped, or rimmed steelpractices at the producers option. These plates areintended for fusion-welded pressure vessels.

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

Tensile Strength,Grade ksi (MPa)

A 4565 (310450)B 5070 (345485)C 5575 (380515)

1.3 The maximum thickness of plates under thisspecification, for reasons of internal soundness, is lim-ited to a maximum thickness of 2 in. (50 mm) for allgrades.

NOTEFor killed carbon steels only refer to the following ASTMspecifications:

A 299, Pressure Vessel Plates, Carbon Steel, Manganese-Silicon

A 515 Pressure Vessel Plates, Carbon Steel, for Interme-diate and Higher Temperature Service

A 516 Pressure Vessel Plates, Carbon Steel, for Moderateand Lower Temperature Service

1.4 The values stated in either inch-pound units orSI units are to be regarded separately as standard.Within the text, the SI units are shown in brackets. Thevalues stated in each system are not exact equivalents;therefore, each system must be used independently of

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the other. Combining values from the two systems mayresult in nonconformance with the specification.

2. Applicable Document

2.1 ASTM Standard:A 20/A 20M Specification for General Requirements for

Steel Plates for Pressure Vessels

3. General Requirements and OrderingInformation

3.1 Material supplied to this material specificationshall conform to Specification A 20/A 20M. Theserequirements outline the testing and retesting methodsand procedures, permissible variations in dimensionsand mass, quality and repair of defects, marking, load-ing, etc.

3.2 Specification A 20/A 20M also establishes therules for the ordering information that should be com-plied with when purchasing material to this specification.

3.3 In addition to the basic requirements of thisspecification, certain supplementary requirements areavailable when additional control testing or examinationis required to meet end use requirements. The purchaseris referred to the listed supplementary requirements inthis specification and to the detailed requirements inSpecification A 20/A 20M.

3.4 If the requirements of this specification are inconflict with the requirements of Specification A 20/

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SA-285/SA-285M 1998 SECTION II

A 20M, the requirements of this specification shallprevail.

4. Heat Treatment

4.1 Plates are normally supplied in the as-rolledcondition. The plates may be ordered normalized orstress relieved, or both.

TABLE 198CHEMICAL REQUIREMENTS

Composition, %

Elements Grade A Grade B Grade C

Carbon, maxA 0.17 0.22 0.28Manganese, max

Heat analysis 0.90 0.90 0.90Product analysis 0.98 0.98 0.98

Phosphorus, maxA 0.035 0.035 0.035Sulfur, maxA 0.035 0.035 0.035

A Applied to both heat and product analysis.

TABLE 2TENSILE REQUIREMENTS

Grade A Grade B Grade C

ksi [MPa] ksi [MPa] ksi [MPa]

Tensile strength 4565 [310450] 5070 [345485] 5575 [380515]Yield strength, minA 24 [165] 27 [185] 30 [205]Elongation in 8 in. or [200 mm], min, %B 27 25 23Elongation in 2 in. or [50 mm], min, % 30 28 27

A Determined by either the 0.2% offset method or the 0.5% extension-under-load method.B See Specification A 20/A 20M.

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5. Chemical Requirements

5.1 The steel shall conform to the requirements asto chemical composition shown in Table 1.

6. Mechanical Requirements

6.1 Tension Tests:

6.1.1 Requirements:

6.1.1.1The material as represented by the ten-sion-test specimens shall conform to the requirementsshown in Table 2.

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PART A FERROUS MATERIAL SPECIFICATIONS SA-285/SA-285M

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 consideredsuitable for use with this specification are listed below by title.

98 S3. Simulated Post-Weld Heat Treatment ofMechanical Test Coupons.

S4.1 Additional Tension Test.

S14. Bend Test.

ADDITIONAL SUPPLEMENTARY REQUIREMENTS

Also listed below are additional optional supplementary requirements suitable forthis specification.

98 S57. Copper-Bearing

S57.1The copper content, by heat analysis shall be0.200.35% and by product analysis 0.180.37%.

98 S58. Restricted Copper

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

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SPECIFICATION FOR PRESSURE VESSEL PLATES, CARBON STEEL, LOW- AND INTERMEDIATE-TENSILE STRENGTH1. Scope2. Applicable Document3. General Requirements and Ordering Information4. Heat Treatment5. Chemical Requirements6. Mechanical Requirements

SUPPLEMENTARY REQUIREMENTSS3. Simulated Post-Weld Heat Treatment of Mechanical Test Coupons.S14. Bend Test

ADDITIONAL SUPPLEMENTARY REQUIREMENTSS57. Copper-BearingS58. Restricted Copper

TABLESTABLE 1 CHEMICAL REQUIREMENTSTABLE 2 TENSILE REQUIREMENTS