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ASTM Standards for Steel Plates for PressureVessels

Sumário:Standard designation A20-85 covers a group of common requirements which, unlessotherwise specified in the individual material specification, shall apply to rolled steel platesfor pressure vessels under each of the following specifications issued by ASTM quoted inthis article.This specification also covers a group of supplementary requirements, whichare applicable to several of the above specifications as indicated therein. These areprovided for use when additional testing or inspection is desired and apply only whenspecified individually by the purchaser in the order.

Standard designation A20-85 covers a group of common requirements which, unless otherwisespecified in the individual material specification, shall apply to rolled steel plates for pressurevessels under each of the following specifications issued by ASTM:Title of Specification ASTM

DesignationPressure Vessel Plates, Alloy Steel, Chromium-Manganese-Silicon A202Pressure Vessel Plates, Alloy Steel, Nickel A203

Pressure Vessel Plates, Alloy Steel, Molybdenum A204Pressure Vessel Plates, Alloy Steel, Manganese-Vanadium A225

Pressure Vessel Plates, Carbon Steel, Low and Intermediate-Tensile Strength A285Pressure Vessel Plates, Carbon Steel, Manganese-Silicon A299

Pressure Vessel Plates, Alloy Steel, Manganese-Molybdenum and Manganese-Molybdenum-Nickel

A302

Pressure Vessel Plates, Alloy Steel, 9 Percent Nickel Double-Normalized andTempered

A353

Pressure Vessel Plates, Alloy Steel, Chromium- Molybdenum A387Pressure Vessel Plates, Carbon Steel, Improved Transition Properties A442

Pressure Vessel Plates, Carbon Steel, High Strength Manganese A455Pressure Vessel Plates, Carbon Steel, for Intermediate-and HigherTemperature Service

A515

Pressure Vessel Plates, Carbon Steel, Moderate-and Lower- TemperatureService

A516

Pressure Vessel Plates, Alloy Steel, High Strength, Quenched and Tempered A517

Pressure Vessel Plates, Alloy Steel, Quenched and Tempered, Manganese-Molybdenum and Manganese- Molybdenum-Nickel

A533

Pressure Vessel Plates, Heat-Treated, Carbon Manganese-Silicon Steel A537

Pressure Vessel Plates, Alloy Steel Precipitation Hardening 18 Percent Nickel A538Pressure Vessel Plates, Alloy Steel, Quenched and Tempered Chromium-Molybdenum

A542

Pressure Vessel Plates, Alloy Steel, Quenched and Tempered Nickel-Chromium-Molybdenum

A543

Pressure Vessel Plates, Alloy Steel, Quenched and Tempered 8 and 9 PercentNickel

A553

Pressure Vessel Plates, Carbon steel, Manganese-Titanium for Glass orDiffused Metallic Coatings

A562

Pressure Vessel Plates, Alloy Steel, Precipitation-Hardening 12 Percent Nickel A590Pressure Vessel Plates, Alloy Steel, Quenched and Tempered Nickel-Cobalt-Molybdenum- Chromium

A605

Pressure Vessel Plates, Carbon Steel, High Strength, for Moderate-and Lower-Temperature Service

A612

Pressure Vessel Plates, Five Percent Nickel Alloy steel, Specially Heat Treated A645

Pressure Vessel Plates, Alloy Steel, 36 Percent Nickel A658Pressure Vessel Plates, Carbon-Manganese, for Moderate and lowerTemperature Service

A662

Pressure Vessel Plates, Carbon Steel, Quenched and Tempered, for WeldedLayered Pressure Vessels

A724

Pressure Vessel Plates, Alloy Steel and High-Strength Low-Alloy Steel,Quenched and Tempered

A734

Pressure Vessel Plates, Low-Carbon, Manganese-Molybdenum-ColumbiumAlloy Steel, for Moderate and Lower Temperature Service

A735

Pressure Vessel Plates, Low-Carbon Age-Hardening Nickel-Copper-Chromium-Molybdenum-Columbium Alloy Steel

A736

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Pressure Vessel Plates, High-Strength Low-Alloy Steel A737

Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel, forModerate and Lower Temperature Service

A738

Pressure Vessel Plates, Quenched and Tempered, Manganese Chromium-Molybdenum-Silicon-Zirconium Alloy Steel

A782

This specification also covers a group of supplementary requirements, which are applicable toseveral of the above specifications as indicated therein. These are provided for use whenadditional testing or inspection is desired and apply only when specified individually by thepurchaser in the order.

Appendix X2 describes the production and some of the characteristics of coiled product fromwhich pressure vessel plates may be produced.

In case of any conflict in requirements, the requirements of the individual material specificationshall prevail over those of this general specification.

The purchaser may specify additional requirements which do not negate any the provisions ofthis general specification or of the individual material specifications. Such additionalrequirements, the acceptance of which is subject to negotiation with the supplier, must beincluded in the order information.

In general, all these materials are intended to be suitable for fusion welding.

Manufacture

Unless otherwise specified in the material specification, the steel may be made by any of thefollowing processes: open-hearth, basic-oxygen, electric-furnace, vacuum arc remelt (VAR) orelectroslag remelt (ESR).The steel may be cast in ingots or may be strand cast. If more than one heat is consecutivelystrand cast at one time, the heats must be melted to the same steelmaking composition range.When such continuous strand casting is employed, the heat number assigned to the castproduct (slab) may remain unchanged until all of the steel in the slab is from the following heat.

The ratio of reduction of thickness from a strand-cast slab to plate shall be a minimum of 3 to 1.Plates are produced in either discrete cut lengths of flat product or from coils. Plates producedfrom coil means plates that have been leveled or flattened and cut to length from a coiledproduct and that are furnished without heat treatment. Plates that are annealed, normalized,normalized-and-tempered, or quenched-and-tempered after decoiling shall be considered todiscrete cut lengths of flat products.

Heat Treatment

When material is required to be heat treated, the heat treatment may be performed either bythe manufacturer or processor or by the fabricator unless otherwise specified in the materialspecification.When the heat treatment required by the material specification is to be performed by thepurchaser or his agent, and the material is to be supplied by the material producer in acondition other than that required by the material specification, the order shall so state.

When plates are ordered without the heat treatment required by the material specification, heattreatment of the plates to conform to the requirements of the material specification shall beresponsibility of the purchaser.

When heat treatment is to be performed, the material shall be heat treated as specified in thematerial specification. The purchaser may specify the heat treatment to be used provided it isnot in conflict with the requirements of the material specification.

When normalizing is to be performed by the fabricator, it may be accomplished by heatinguniformly for hot forming. The temperature to which the plates are heated for hot forming shallnot significantly exceed the normalizing temperature.

When no heat treatment is required, the manufacturer or processor at his option may heat treatthe plates by normalizing and then stress relieving to meet the material specification.

If approved by the purchaser, cooling rates faster than those obtained by cooling in air arepermissible for improvement of the toughness, provided the plates are subsequently temperedin the temperature range from 595 to 705oC.

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