ASTM A420 Pipe Fittings

A420 Pipe Fittings are designed for low-temperature applications and are made from carbon steel materials that provide excellent toughness and strength at low temperatures.

A420 Pipe Fittings of Wrought Carbon Alloy Steel for Low Temperature Uses

SSM offers ASTM A420 pipe fittings, which are essential components for systems operating in low-temperature environments. For more detailed information, please refer to the following:

A420 wrought carbon steel & alloy steel piping fittings supplier, SSM provides product parameters as shown in the following table:

Items	Parameters
OD	NPS 1/8″ – 4″ for Forged Threaded and Socket-Welding Fittings / NPS 1⁄2″- 48″ for Wrought Buttwelding Fittings
Class / WT	2000 3000 6000 / SCH5S-SCHXXS
Types	Elbow / Cross / Tee / Coupling / Cap / Plug /Bushing / reducer / lap joint stub ends
Grade	ASTM A420 WPL6, WPL3, and WPL8.
Standards	ASTM A420 / ASME B16.9. B16.11, MMS-SP-79,MSS-SP-83, MMS-SP-95, MMS-SP-97

Chemical Composition & Mechanical Properties

ASTM A420 fittings cover various grades of wrought carbon and alloy steel, each with distinct chemical compositions and mechanical properties. These fittings are designed for low-temperature environments.

Element	Grade WPL6 (%)	Grade WPL3 (%)	Grade WPL8 (%)
Carbon (C)	≤ 0.30	≤ 0.20	≤ 0.13
Manganese (Mn)	0.50 – 1.35	0.70 – 1.00	0.90 – 1.60
Phosphorus (P)	≤ 0.035	≤ 0.035	≤ 0.020
Sulfur (S)	≤ 0.040	≤ 0.040	≤ 0.020
Silicon (Si)	0.15 – 0.40	0.15 – 0.35	0.15 – 0.35
Nickel (Ni)	–	–	0.40 – 1.00
Chromium (Cr)	–	–	≤ 0.30
Copper (Cu)	–	–	≤ 0.40
Molybdenum (Mo)	–	–	≤ 0.12

The mechanical properties of each grade also differ:

Property	Grade WPL6	Grade WPL3	Grade WPL8
Tensile Strength (MPa)	415 min	415 min	485 min
Yield Strength (MPa)	240 min	240 min	275 min
Elongation (%)	20 min (L/T)	22 min (L/T)	20 min (L)
Impact Energy (J) (at -50°C)	27 min	27 min	34 min

Advantages and Disadvantages of ASTM A420

ASTM pipe fittings, noted for their toughness and mechanical strength, are great for low-temperature uses but are pricier and might need special manufacturing. They’re versatile and industry-compliant but are not suited for high temperatures and may need extra coatings in corrosive environments.

Advantages:

ASTM A420 pipe fittings demonstrate excellent toughness and impact resistance in low-temperature environments, making them well-suited for applications in cold climates. They also offer reliable mechanical strength. Some grades (such as WPL8) contain alloying elements like nickel, which improve impact resistance at low temperatures.

Disadvantages:

The initial cost of ASTM A420 pipe fittings may be higher. They are not suitable for high-temperature services, and in certain corrosive environments, additional protective coatings or treatments may be necessary to improve corrosion resistance.

Applications of ASTM A420 Pipe Fittings

FAQ

What is the difference between WPL6, WPL9, and WPL3 fittings?

These are different grades indicating the minimum tensile strength and impact values at low temperatures. WPL6 is the most commonly used grade for low-temperature service, while WPL9 and WPL3 have specific requirements suited for different conditions.

What are the manufacturing processes allowed under ASTM A420?

Fittings under ASTM A420 can be manufactured by forging, forming, welding, or seamless processes. Each manufacturing process has specific requirements to ensure the quality and integrity of the fittings.

What are the inspection and testing requirements for ASTM A420 fittings?

ASTM A420 specifies various inspection and testing methods to ensure the fittings meet the required standards, including visual inspection, hydrostatic testing, nondestructive testing (such as ultrasonic examination), and mechanical tests (tensile, impact, hardness).