ASTM A420 WPL6 Connections

ASTM A420 WPL6 Standard Connection Specification

ASTM A420 / A420M-07 Standard specification for forged carbon steel and alloy steel pipe connections for low temperature service.

ASTM A420 WPL6 Grade is associated with ASTM A420 for forged carbon steel pipe fittings.

WPL6 is a standard carbon steel type that has been Charpy impact tested at -50 degrees F for use in low temperature service.

Materials shall consist of forgings, rods, plates, seamless welded or fused tubular products with addition of filler metal and shall be produced by open furnace, basic oxygen or electric furnace process. Forging or stamping operations shall be performed by one or a combination of two or more of the following procedures: hammering, pressing, drilling, extruding, twisting, working, bending, fusion welding or machining.

All welding must be completed prior to austenitizing heat treatment, which must be performed under standard, normalized and quenched, annealed or quenched conditions.

Steel samples shall comply with the required values ​​of chemical composition, tensile strength, yield strength, elongation, wall thickness and impact value of the Charpy V notch.

All fusion welded joints must be radiographically examined, while hydrostatic connection testing is not required in this specification. Repair welding must be permitted for parts made to dimensional standards.

Scope of ASTM A420 standard

    1.1 This specification covers seamless and welded construction carbon steel and forged steel fittings 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 that differ from these ASME and MSS standards shall be provided 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 accessories where a higher degree of examination is desired. When desired, one or more of these additional

    requirements must be specified in order.

    1.3 This specification is expressed in inch-pound units and SI units. However, unless the order specifies the specification designation? M? applicable (SI units), material must be supplied for pound-inch units.

    1.4 The values ​​given in SI units or inch-pound units should be considered separately as standard. Within the text, SI units are shown in parentheses. The values ​​given in each system may not be exact equivalents; therefore, each system must be used independently of the other.

Combining values ​​from both systems may result in non-compliance with the standard.

Chemical Composition (%) ASTM A420 WPL6 Connections

WPL6 (1) (2)0,30,60 - 1,350,0350,040,15 - 0,300,3
WPL 90,20,40 - 1,060,030,03--
WPL6 (1) (2)0,120,40,40,080,02
WPL 9-1,60 - 2,240,75 - 1,25--


All values ​​are maximum unless otherwise noted.


    (1) For each reduction of 0.01% C below 0.30%, an increase of 0.05% Mn above 1.06% to a maximum of 1.35% shall be allowed.

    (2) Fittings made of forgings can have a maximum of 1.35% Mn.

Mechanical Properties of ASTM A420 WPL6 Connection ASTM A420

Traction RequirementsWPL6WPL9
Tensile strength, min, ksi [M Pa]60-85 [415-585]63-88 [435-610]
Yield strength, min, ksi [M Pa]35 [240]46 [275]

Where the wall thickness is between two values ​​above, the minimum elongation value is determined by the following equations:

WPL6, WPL9 Longitudinal E = 48t + 15.00, E = 48t + 13.00 E transverse = 32t + 6.50, E = 32t + 8.00 E = elongation at 2in [50mm],% t = actual sample thickness in [mm]

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