ASTM A420 WPL6 Concentric Reducer ASME B16.9 Butt Weld Fitting
A420 WPL6 concentric reducers are butt welding pipe fittings manufactured according to ASME B16.9 dimensional standards and produced from ASTM A420 WPL6 low temperature carbon steel. These fittings are designed to connect pipes of different diameters in low temperature piping systems.
A concentric reducer maintains a common centerline between the larger and smaller pipe ends, providing a smooth and gradual transition in the pipeline. ASTM A420 WPL6 reducers are widely used in oil and gas pipelines, LNG facilities, petrochemical plants and cryogenic piping systems where reliable performance at low temperatures is required.
All of our ASTM A420 WPL6 pipe fittings comply with the requirements of NACE MR0175, making them suitable for sour service environments.
Pipe reducers are essential components in piping systems because they allow a safe transition between pipes of different diameters. There are two main types of reducers used in industrial pipelines:
-
Concentric reducers
-
Eccentric reducers
ASTM A420 WPL6 Material Specification
ASTM A420 is the standard specification for wrought carbon steel and alloy steel pipe fittings for low temperature service.
ASTM A420 WPL6 fittings are commonly manufactured from ASTM A333 Grade 6 seamless pipes, which are intended for low temperature applications requiring notch toughness.
Typical piping systems using WPL6 fittings include:
- ASTM A333 Gr 6 Seamless Pipe
-
ASTM A350 LF2 forged fittings
These materials are commonly used together in low temperature pipeline systems.
ASTM A420 WPL6 Chemical Composition
| Element | C | Mn | P | S | Si | Ni | Cr | Mo | Cu | Nb | V |
|---|---|---|---|---|---|---|---|---|---|---|---|
| % | ≤0.30 | 0.50–1.06 | ≤0.035 | ≤0.040 | 0.15–0.40 | ≤0.40 | ≤0.30 | ≤0.12 | ≤0.40 | ≤0.02 | ≤0.08 |
All values are expressed in percentage.
Mechanical Properties
ASTM A420 WPL6 fittings must meet the following mechanical property requirements.
| Property | Value |
|---|---|
| Tensile Strength | 415 – 655 MPa |
| Yield Strength | ≥ 240 MPa |
| Elongation | 30% (Longitudinal) |
These mechanical properties ensure adequate strength and ductility in low temperature environments.
Impact Test Requirements
ASTM A420 WPL6 reducers are designed for low-temperature service and must undergo Charpy V-notch impact testing.
Typical Impact Test Requirements
| Item | Requirement |
|---|---|
| Test Temperature | −46°C |
| Minimum Impact Energy | 27 Joules |
Impact testing ensures:
- notch toughness
- crack resistance
- safe low-temperature operation
Dimensional Standard
A420 WPL6 concentric reducers are manufactured according to:
ASME B16.9 – Factory-Made Wrought Butt Welding Fittings
This standard defines the dimensions, tolerances and end preparation for butt weld fittings used in industrial piping systems.
Heat Treatment
ASTM A420 WPL6 pipe fittings are normally supplied in the normalized or quenched and tempered condition.
Heat treatment improves grain structure and ensures compliance with the mechanical property requirements specified by ASTM A420.
Size Range
ASTM A420 WPL6 concentric reducers are commonly produced in the following range:
Wall Thickness: SCH 10 – SCH XXS
Standard: ASME B16.9
Custom dimensions may also be manufactured according to project requirements.
ASTM A420 WPL6 Concentric Reducer Dimensions
Reducers are manufactured according to ASME B16.9 dimensional requirements.
| NPS | O.D. D |
O.D. D1 |
Length H |
| 3/4 – 1/2 | 26.7 | 21.3 | 38 |
| 1 – 1/2 | 33.4 | 21.3 | 51 |
| 1 – 3/4 | 33.4 | 26.7 | 51 |
| 1.1/4 – 1/2 | 42.2 | 21.3 | 51 |
| 1.1/4 – 3/4 | 42.2 | 26.7 | 51 |
| 1.1/4 – 1 | 42.2 | 33.4 | 51 |
| 1.1/2 – 1/2 | 48.3 | 21.3 | 64 |
| 1.1/2 – 3/4 | 48.3 | 26.7 | 64 |
| 1.1/2 – 1 | 48.3 | 33.4 | 64 |
| 1.1/2 – 1.1/4 | 48.3 | 42.2 | 64 |
| 2 – 3/4 | 60.3 | 26.7 | 76 |
| 2 – 1 | 60.3 | 33.4 | 76 |
| 2 – 1.1/4 | 60.3 | 42.2 | 76 |
| 2 – 1.1/2 | 60.3 | 48.3 | 76 |
| 2.1/2 – 1 | 73 | 33.4 | 89 |
| 2.1/2 – 1.1/4 | 73 | 42.2 | 89 |
| 2.1/2 – 1.1/2 | 73 | 48.3 | 89 |
| 2.1/2 – 2 | 73 | 60.3 | 89 |
| 3 – 1.1/4 | 88.9 | 42.2 | 89 |
| 3 – 1.1/2 | 88.9 | 48.3 | 89 |
| 3 – 2 | 88.9 | 60.3 | 89 |
| 3 – 2.1/2 | 88.9 | 73 | 89 |
| 3.1/2 – 1.1/4 | 101.6 | 42.2 | 102 |
| 3.1/2 – 1.1/2 | 101.6 | 48.3 | 102 |
| 3.1/2 – 2 | 101.6 | 60.3 | 102 |
| 3.1/2 – 2.1/2 | 101.6 | 73 | 102 |
| 3.1/2 – 3 | 101.6 | 88.9 | 102 |
| 4 – 1.1/2 | 114.3 | 48.3 | 102 |
| 4 – 2 | 114.3 | 60.3 | 102 |
| 4 – 2.1/2 | 114.3 | 73 | 102 |
| 4 – 3 | 114.3 | 88.9 | 102 |
| 4 – 3.1/2 | 114.3 | 101.6 | 102 |
| 5 – 2 | 141.3 | 60.3 | 127 |
| 5 – 2.1/2 | 141.3 | 73 | 127 |
| 5 – 3 | 141.3 | 88.9 | 127 |
| 5 – 3.1/2 | 141.3 | 101.6 | 127 |
| 5 – 4 | 141.3 | 114.3 | 127 |
| 6 – 2.1/2 | 168.3 | 73 | 140 |
| 6 – 3 | 168.3 | 88.9 | 140 |
| 6 – 3.1/2 | 168.3 | 101.6 | 140 |
| 6 – 4 | 168.3 | 114.3 | 140 |
| 6 – 5 | 168.3 | 141.3 | 140 |
| 8 – 3.1/2 | 219.1 | 101.6 | 152 |
| 8 – 4 | 219.1 | 114.3 | 152 |
| 8 – 5 | 219.1 | 141.3 | 152 |
| 8 – 6 | 219.1 | 168.3 | 152 |
| 10 – 4 | 273 | 114.3 | 178 |
| 10 – 5 | 273 | 141.3 | 178 |
| 10 – 6 | 273 | 168.3 | 178 |
| 10 – 8 | 273 | 219.1 | 178 |
| 12 – 5 | 323.9 | 141.3 | 203 |
| 12 – 6 | 323.9 | 168.3 | 203 |
| 12 – 8 | 323.9 | 219.1 | 203 |
| 12 – 10 | 323.9 | 273 | 203 |
| 14 – 6 | 355.6 | 168.3 | 330 |
| 14 – 8 | 355.6 | 219.1 | 330 |
| 14 – 10 | 355.6 | 273 | 330 |
| 14 – 12 | 355.6 | 323.9 | 330 |
| 16 – 8 | 406.4 | 219 | 356 |
| 16 – 10 | 406.4 | 273 | 356 |
| 16 – 12 | 406.4 | 323.9 | 356 |
| 16 – 14 | 406.4 | 355.6 | 356 |
| 18 – 10 | 457 | 273 | 381 |
| 18 – 12 | 457 | 323.9 | 381 |
| 18 – 14 | 457 | 355.6 | 381 |
| 18 – 16 | 457 | 406.4 | 381 |
| 20 – 12 | 508 | 323.9 | 508 |
| 20 – 14 | 508 | 355.6 | 508 |
| 20 – 16 | 508 | 406.4 | 508 |
| 20 – 18 | 508 | 457 | 508 |
| 22 – 14 | 559 | 355.6 | 508 |
| 22 – 16 | 559 | 406.4 | 508 |
| 22 – 18 | 559 | 457 | 508 |
| 22 – 20 | 559 | 508 | 508 |
| 24 – 16 | 610 | 406.4 | 508 |
| 24 – 18 | 610 | 457 | 508 |
| 24 – 20 | 610 | 508 | 508 |
| 24 – 22 | 610 | 559 | 508 |
Manufacturing Process
Typical manufacturing processes for concentric reducers include:
-
Hot forming
-
Cold forming
-
Forging
After forming, the reducers undergo machining, heat treatment and inspection to ensure compliance with ASTM and ASME standards.
Inspection and Testing
Reducers manufactured according to ASTM A420 WPL6 may undergo several inspection procedures, including:
-
Chemical composition analysis
-
Mechanical testing
-
Charpy impact testing
-
Ultrasonic testing (UT)
-
Dimensional inspection
Products are typically supplied with EN 10204 3.1 mill test certificates.
Is ASTM A420 WPL6 Reducer NACE MR0175 Compliant?
Yes. ASTM A420 WPL6 reducers can be manufactured according to:
- NACE MR0175
- ISO 15156
- NACE MR0103
Additional sour service requirements may include:
- hardness control
- HIC testing
- low sulfur chemistry control
WPL6 reducers are widely used in:
- sour gas pipelines
- offshore oil & gas systems
- refinery applications
Applications
A420 WPL6 concentric reducers are widely used in piping systems operating at low temperatures, including:
-
LNG plants
-
oil and gas pipelines
-
petrochemical plants
-
offshore platforms
-
cryogenic piping systems
These fittings provide reliable performance in demanding low temperature environments.
Frequently Asked Questions
What is ASTM A420 WPL6 reducer used for?
ASTM A420 WPL6 reducers are used in low-temperature piping systems to connect pipes of different diameters.
What is the difference between concentric and eccentric reducers?
Concentric reducers maintain centerline alignment, while eccentric reducers feature offset design to prevent air pockets in horizontal piping.
Are ASTM A420 WPL6 reducers suitable for LNG service?
Yes. WPL6 reducers are widely used in LNG and cryogenic applications.
What is the impact test temperature for ASTM A420 WPL6?
Typical impact testing is performed at:
- −46°C
Can ASTM A420 WPL6 reducers meet NACE MR0175 requirements?
Yes. NACE compliant WPL6 reducers can be supplied for sour service applications.
ASTM-A420-WPL6-Reducer-A420 WPL6-Concentric-Reducer-ASME B16.9
ASTM A420 WPL6 Concentric Reducer
Related Pipe Fittings
Common butt weld fittings used together with reducers include:
-
- ASTM A420 WPL6 Butt Weld Elbows
-
ASTM A420 WPL6 Butt Weld Tees
-
ASTM A420 WPL6 Eccentric Reducers
All fittings are typically manufactured according to ASME B16.9.
Ordering Information
Example order description:
Size: 6″ × 3″
Schedule: SCH 80 / XS
Standard: ASME B16.9
End: Bevel End
Type: Seamless
