ASTM A420/A420M-20

Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service

pipe fittings materials data

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Abstract

This specification covers wrought carbon steel and alloy steel pipe fittings of seamless and welded construction for use in pressure piping and pressure vessel service at low temperatures. Materials shall consist of forgings, bars, plates, seamless or fusion welded tubular products with filler metal added, and shall be produced by open-hearth, basic-oxygen, or electric-furnace process. Forging or forming operations shall be performed by one or a combination of two or more of the following procedures: hammering, pressing, piercing, extruding, upsetting, working, bending, fusion-welding, or machining. All welding shall be completed prior to the austenitizing heat treatment, which shall be executed in the normalized, normalized and tempered, annealed, or quenched and tempered conditions. Steel specimens shall conform to required values of chemical composition, tensile strength, yield strength, elongation, wall thickness, and Charpy V-notch impact value. All fusion-welded butt joints shall undergo radiographic examination, while hydrostatic testing of fittings is not required in this specification. Repair welding shall be permissible for parts made to dimensional standards.

Scope

1.1 This specification2 covers wrought carbon steel and alloy steel fittings of seamless and welded construction, covered by the latest revision of ASME B16.9, ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, and MSS SP-97. Fittings differing from these ASME and MSS standards shall be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M. These fittings are for use in pressure piping and pressure vessel service at low temperatures.

1.2 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. When desired, one or more of these supplementary requirements shall be specified in the order.

1.3 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.

1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.5 This international standard was developed in accordance with internationally recognized principles on 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.

astm-a420-wpl6-90d-elbow-10in-42mm-wt

astm-a420-wpl6-90d-elbow-10in-42mm-wt

1. ASTM A420 Chemical Composition Requirements

Chemical Composition of ASTM A420
ElementsWPL6, %WPL9, %WPL3, %WPL8, %
Carbon [C]≤0.30≤0.20≤0.20≤0.13
Manganese [Mn]0.50-1.350.40-1.060.31-0.64≤0.90
Phosphorus [P]≤0.035≤0.030≤0.05≤0.030
Sulfur [S]≤0.040≤0.030≤0.05≤0.030
Silicon [Si]0.15-0.400.13-0.370.13-0.37
Nickel [Ni]≤0.401.60-2.243.2-3.88.4-9.6
Chromium [Cr]≤0.30.........
Molybdenum [Mo]≤0.12.........
Copper [Cu]≤0.400.75-1.25
Columbium [Cb]≤0.02.........
Vanadium[V]≤0.08.........

*For grade WPL6, the limit for Columbium may be increased up to 0.05% on heat analysis and 0.06% on product analysis.
*Fittings of WPL3 made from plate or forgings may have 0.90 % max manganese.
*Fittings of WPL8 made from plate may have 0.98 % max manganese.

 

2. ASTM A420 Mechanical Properties

 

ASTM A420/ A420MTensile Strength, min.Yield Strength, min.Elongation %, min
GradeksiMPaksiMPaLongitudinalTransverse
WPL665-95415-655352402212
WPL963-88435-6104631520
WPL365-90450-620352402214
WPL8100-125690-8657551516

*All the elongation values are on the basis of standard round specimen, or small proportional specimen, min % in 4 D.

 

3. Impact Test Properties

Since these pipe fittings are primarily used for low-temperature service, the properties of charpy V-notch impact test must be considered.

 

Charpy Impact Requirements for WPL6, WPL9, and WPL3
Size of SpecimenA*B*
mmft·lbfJft·lbfJ
10 by 10.01317.61013.6
10 by 7.51013.6810.8
10 by 5.079.557.0
10 by 2.545.434.1

A*Charpy V-Notch Impact Value Required for Acceptance (Average of Three Specimens)
B*Minimum Charpy V-Notch Impact Value Without Requiring Retest (One Specimen Only of a Set)

 

 

Charpy Impact Requirements for WPL8
Size of SpecimenA*B*
mmft·lbfJft·lbfJ
10 by 10.025.033.920.027.1
10 by 7.521.028.517.023.1
10 by 5.017.023.114.019.0
10 by 2.58.010.86.08.1

A*Charpy V-Notch Impact Value Required for Acceptance (Average of Three Specimens)
B*Minimum Charpy V-Notch Impact Value Without Requiring Retest (One Specimen Only of a Set)

 

Impact Test Temperature
Grade°F [°C]
WPL6−50 [−45]
WPL9−100 [−75]
WPL3−150 [−100]
WPL8−320 [−195]

4. Material and Manufacture

The raw material for these fittings shall be fully killed steel, consisting of forgings, bars, plates, sheet, and seamless or fusion welded tubular products(pipes, tubes, or cylinders). The steels shall be made using recognized melting practices necessary to produce steels that shall meet the impact requirements of ASTM A420.

astm-a420-wpl6-conc-reducer-10x6-inch

astm-a420-wpl6-conc-reducer-10x6-inch

The ASTM A420 fittings may be made by forging or forming operations including hammering, pressing, piercing, extruding, upsetting, working, bending, fusion-welding, or machining, or by a combination of two or more of these operations. The forming procedure shall be so applied that it will not produce injurious defects in the fittings. All the fittings shall be furnished free of welding repair. The welded joints of the fittings shall be finished in accordance with the requirements of Paragraph UW-35 (a) of Section VIII, Division 1 of ASME Boiler and Pressure Vessel Code.

5. Heat Treatment

All fittings shall be furnished in the normalized, normalized and tempered, annealed, or quenched and tempered condition. All welding shall be completed prior to the austenitizing heat treatment. After forming, the fittings shall be allowed to cool below the lower critical before applying one of the heat treatments. When specified, post-weld heat treatment may be required.

6. Product & Standards

StandardsProduct
ASME B16.9Factory-Made Wrought Steel Butt Welding Threaded
ASME B16.11Forged Steel Fittings, Socked Welding Threaded
ASME Section VIII Division 1Pressure Vessels
MSS SP-25Standard Marking System for Valves, Fittings, Flanges, and Unions
MSS SP-79Socket Welding Reducer Inserts
MSS SP-83Steel Pipe Unions, Socket-Welding and Threaded
MSS SP-95Swage(d) Nipples and Bull Plugs
MSS SP-97Integrally Reinforced Forged Branch Outlet Fittings-Socket Welding, Threaded and Buttwelding Ends

7. Tests and Inspections

Pipe fittings manufactured to ASTM A420 shall take the following tests or inspections: dimensional inspection, visual examination, hydrostatic test(when required), chemical analysis, tensile test, impact test, radiographic test(RT).

C&N Huitong group can produce pipe fittings of such materials :

ASTM Standard MaterialASTM A53 A53M Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
ASTM A106 A106M Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service
API 5L Specification for Line Pipe
ASTM A213 2018 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
ASTM A312 A312M Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
ASTM A234 A234M Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service
ASTM A403 A403M Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
ASTM A420 A420M Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service
ASTM A860 A860M Standard Specification for Wrought High-Strength Low-Alloy Steel Butt-Welding Fittings
ASTM A733 Standard Specification for Welded and Seamless Carbon Steel and Austenitic Stainless Steel Pipe Nipples
DIN Standard MaterialDIN1629 Seamless Circular Unalloyed Steel Tubes Subject to special requirements
DIN 2440 Medium-weight threaded steel tubes
DIN 2441 Steel Tubes Heavy Weight For Suitable For Screwing
GOST Standard MaterialGOST-1050 Sized Bars Made of High-Quality Structural Carbon Steel With a Special Surface Finish
GOST 8732 Seamless hot-deformed steel pipes-Range of sizes
GOST 19281 Rolled Steel With Enhanced Strength
JIS Standard MaterialJIS G3452 Carbon steel pipes for ordinary piping
JIS G3454 Carbon steel pipes for pressure service
JIS G3455 Carbon steel pipes for high pressure service
JIS G3456 Carbon steel pipes for high temperature service
JIS G3457 Arc welded carbon steel pipes
JIS G3458 Alloy Steel Pipes
JIS G3459 Stainless steel pipes
JIS G3460 Steel pipes for low temperature service
BS EN Standard MaterialBS EN 10255 Non-alloy steel tubes suitable for welding and threading Technical delivery conditions
BS EN 10253-1 Butt-Welding Pipe Fittings  Part 1: Wrought Carbon Steel for General Use and Without Specific Inspection Requirements
BS EN 10253-2 Butt-welding pipe fittings. part 2: Non alloy ferritic alloy steels with specific inspection requirements
BS EN10253-3 Butt-welding pipe fittings Part 3: Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection requirements
BS EN 10253-4 Butt-welding pipe fittings Part 4:Wrought austenitic and austenitic-ferritic (duplex)stainless steels with specific inspection requirements