ASTM A860 WPHY 42 pipe fittings are wrought high-yield carbon steel buttweld pipe fittings designed to withstand the harshest environments in oil and gas transmission pipelines, petrochemical processing systems and power generation pipelines. The designation WPHY — Wrought Pipe High Yield — and the grade number 42 shows that these fittings are much stronger than regular grade A234 WPB carbon steel fittings. Metinox Overseas produces WPHY 42 fittings using a uniform, precise controlled melting process which gives uniform sulfide inclusions, excellent notch toughness, resistance to hydrogen induced cracking (HIC) and excellent field weldability.
Our WPHY 42 fittings come in seamless, welded and fabricated sizes ranging from 1/2" NB to 48" NB with full material test reports, 3rd party inspection, 100% radiographic testing and certifications such as ISO 9001:2015, PED 97/23/EC and NACE MR0175. From high pressure offshore pipelines, cross country gas transmission, to refinery process systems, Metinox Overseas provides certified WPHY 42 fittings in competitive FOB prices and quick global delivery.
Request a quote todayTable of Contents
- What is ASTM A860 WPHY 42?
- Types of ASTM A860 WPHY 42 Pipe Fittings
- Specification of ASTM A860 WPHY 42 Pipe Fittings
- ASTM A860 WPHY Pipe Fittings Chemical Requirements
- Mechanical Properties ASTM A860 WPHY 42
- Dimensional Reference — ASME B16.9
- WPHY Grade Comparison
- Features & Benefits of ASTM A860 WPHY 42 pipe fittings
- Manufacturing Process
- Testing Capabilities
- Certifications & Standards Compliance
- Heat Treatment Requirements
- Hydrostatic Testing
- ASTM A860 WPHY Pipe Fittings Supply Range
- ASTM A860 WPHY 42 Pipe Fittings Dimensions
- ASTM A860 WPHY 42 Fittings Weight Reference
- FAQs - ASTM A860 WPHY 42 Fittings
- Request a Quote
What is ASTM A860 WPHY 42?
ASTM A860 is the standard specification for Wrought High-Strength Ferric Steel Butt-Welding Fittings for High-Pressure Oxygen Service and General Applications. WPHY 42 is the entry-level high-yield grade within this specification, requiring a minimum yield strength of 415 MPa — significantly higher than standard carbon steel.
The material must be completely killed and produced through a controlled melting process that promotes fine, well-dispersed sulfide inclusions. This provides:
- Superior notch toughness for low-temperature and impact-sensitive applications
- Excellent resistance to hydrogen-induced cracking (HIC) in sour service environments
- Good field weldability with pre-heat requirements per ASME code
- Compatibility with API 5L Grade X42 and X46 line pipe
Types of ASTM A860 WPHY 42 Pipe Fittings
ASTM A860 WPHY 42 Buttweld 90° Elbow
CS WPHY 42 Buttweld 45° Elbow
ASME SA860 WPHY 42 Buttweld 180° Elbow
Carbon Steel WPHY 42 Buttweld LR Elbow
CS WPHY 42 Buttweld SR Elbow
CS WPHY 42 Buttweld Equal Tee
ASTM A860 WPHY 42 Buttweld Reducing Tee
ASME SA860 WPHY 42 Buttweld Unequal Tee
Carbon Steel WPHY 42 Buttweld Barred Tee
ASTM A860 WPHY 42 Buttweld Concentric Reducer
ASME SA860 WPHY 42 Buttweld Eccentric Reducer
ASTM A860 WPHY 42 Buttweld End Cap
ASME SA860 WPHY 42 Buttweld Dish Cap
Carbon Steel WPHY 42 Buttweld Long Stub End
CS WPHY 42 Buttweld Short Stub End
ASTM A860 WPHY 42 Buttweld Barrel Nipple
ASME SA860 WPHY 42 Buttweld Pipe Nipple
Carbon Steel WPHY 42 Buttweld Swage Nipple
Carbon Steel WPHY 42 Buttweld Lateral Cap
Specification of ASTM A860 WPHY 42 Pipe Fittings
Parameter |
Details |
|---|---|
Material Standard | ASTM A860 / ASME SA860 |
Grade | WPHY 42 |
Fitting Type | Wrought / Buttweld / Seamless / Welded / Fabricated |
Size Range | 1/2" NB to 48" NB (DN 15 to DN 1200) |
Wall Thickness | Sch 10S, 20, STD, 40S, 40, 60, 80S, 80, 100, 120, 140, 160, XXS |
Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
Dimensional Standards | ASME B16.9, B16.11, B16.25, B16.28, MSS-SP-75, BS1640, DIN 2605 |
End Finish | Bevelled BW, Plain End, Socket Weld SW, Threaded NPT/BSP |
Pressure Class | 150LB, 300LB, 600LB, 900LB, 1500LB, 2500LB |
Testing | 100% Radiography, Hydrostatic, PMI, Hardness, UT as required |
Origin | Mumbai, India |
ASTM A860 WPHY Pipe Fittings Chemical Requirements
Notes | Description |
Carbon Equivalent (CE) Limit | The calculated Carbon Equivalent value must not exceed 0.42% to ensure adequate weldability and mechanical performance. |
CE Formula | CE = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15 |
Silicon Restriction | When vacuum carbon deoxidation processing is applied, silicon content is limited to 0.10% (heat analysis) and 0.12% (product analysis). |
Alloying Element Control | The combined content of Nickel (Ni), Chromium (Cr), Molybdenum (Mo), and Copper (Cu) shall remain below 1.00%. |
Mechanical Properties ASTM A860 WPHY 42
Property | ASTM A860 WPHY 42 |
Minimum Yield Strength | 42 ksi (290 MPa) |
Tensile Strength | 60–85 ksi (415–585 MPa) |
Maximum Yield Strength Variation | Not more than 15 ksi (105 MPa) above the specified minimum |
Minimum Elongation (5/16 in. and above) | 22% |
Elongation Adjustment | Reduction of 1.5% permitted for every 1/32 in. decrease below 5/16 in. thickness |
Elongation Formula for Thin Sections | E = 48t + 15 |
Impact Testing | Required as per ASTM A860 specification |
Fracture Initiation Control | Requirements intended to minimize fracture initiation |
Fracture Propagation Assurance | Not intended to guarantee resistance to fracture propagation |
Dimensional Reference — ASME B16.9
NPS (in) |
OD (mm) |
Cap Len (in) |
Tee C-E (in) |
Stub Lap Dia |
Stub Long |
Stub Short |
SCH 40 ID |
|---|---|---|---|---|---|---|---|
1/2 | 21.3 | 1 | 1 | 1-3/8 | 3 | 2 | 15.76 |
3/4 | 26.7 | 1 | 1-1/8 | 1-11/16 | 3 | 2 | 20.93 |
1 | 33.4 | 1-1/2 | 1-1/2 | 2 | 4 | 2 | 26.64 |
1-1/4 | 42.2 | 1-1/2 | 1-7/8 | 2-1/2 | 4 | 2 | 35.05 |
1-1/2 | 48.3 | 1-1/2 | 2-1/4 | 2-7/8 | 4 | 2 | 40.90 |
2 | 60.3 | 1-1/2 | 2-1/2 | 3-5/8 | 6 | 2-1/2 | 52.50 |
3 | 88.9 | 2 | 3-3/8 | 5 | 6 | 2-1/2 | 77.93 |
4 | 114.3 | 2-1/2 | 4-1/8 | 6-3/16 | 6 | 3 | 102.26 |
6 | 168.3 | 3-1/2 | 5-5/8 | 8-1/2 | 8 | 3-1/2 | 154.10 |
8 | 219.1 | 4 | 7 | 10-5/8 | 8 | 4 | 202.72 |
10 | 273.1 | 5 | 8-1/2 | 12-3/4 | 10 | 5 | 254.51 |
12 | 323.9 | 6 | 10 | 15 | 10 | 6 | 303.23 |
WPHY Grade Comparison
ASTM A860 covers multiple high-yield grades. Understanding their differences helps engineers select the optimal fitting grade for pressure-temperature design requirements.
Property |
WPHY 42 |
WPHY 46 |
WPHY 52 |
WPHY 60 |
|---|---|---|---|---|
Yield Strength (MPa) | 415 min | 315 min | 360 min | 415 min |
Tensile Strength (MPa) | 515–690 | 435–570 | 455–590 | 515–655 |
Min. Elongation (%) | 28 | 28 | 25 | 20 |
Charpy @ -46C | 25 J | 25 J | 25 J | 25 J |
Pipeline API Grade | X42 | X46 | X52 | X60 |
Heat Treatment | Required | Required | Required | Required |
Typical Use | Moderate HP O&G | Distribution | Transmission | High-P Trunk |
Metinox Stock | In Stock | In Stock | In Stock | In Stock |
Features & Benefits of ASTM A860 WPHY 42 pipe fittings
Feature |
Benefit to End User |
|---|---|
73% higher yield vs A234 WPB | Thinner walls possible — reduces material weight and total installed cost |
Killed, fine-grained steel | Consistent grain structure delivers predictable mechanical performance batch to batch |
HIC / SSC resistant | Safe for sour service (H2S) environments per NACE MR0175 — reduces risk of in-service failure |
100% radiography tested | Zero-defect weld guarantee; reduces field rework and inspection cost |
Heat-treated per A960/A960M | Verified mechanical properties before dispatch; traceability assured |
Sizes 1/2" to 48" NB | Single-source procurement for all line sizes in a pipeline project |
EN 10204 3.1/3.2 MTR | Full material traceability for pressure vessel and pipeline code compliance |
FOB India competitive pricing | Lower landed cost compared to European/US manufacturers; faster delivery to ME/Asia projects |
Manufacturing Process
Every WPHY 42 fitting produced by Metinox Overseas undergoes a controlled six-stage manufacturing and quality assurance process:
Step |
Stage |
Description |
|---|---|---|
01 | Raw Material Procurement | Killed fine-grained carbon steel billets/plates from certified mills with full heat analysis MTRs |
02 | Hot Forming / Forging | Fittings formed above transformation temperature for superior grain structure and mechanical strength |
03 | Heat Treatment | Normalising, quenching, tempering, or stress relieving per ASTM A960/A960M specifications |
04 | Dimensional Inspection | 100% verification against ASME B16.9, B16.28, MSS-SP-75 using calibrated gauges and CMM |
05 | NDE / NDT Testing | Radiography (RT), Ultrasonic (UT), Magnetic Particle (MT), Dye Penetrant (PT), PMI as per project spec |
06 | Documentation & Dispatch | Mill TC, inspection reports, packing list, TPI certificate issued before worldwide shipment |
Testing Capabilities
Mechanical Tests |
Non-Destructive Tests |
Chemical Tests |
Dimensional Tests |
|---|---|---|---|
Tensile & Yield (ASTM A370) | 100% Radiography (RT) | PMI – Positive Material ID | CMM dimensional inspection |
Charpy Impact @ -46C | Ultrasonic Testing (UT) | Spectrochemical / OES | B16.9 wall thickness check |
Hardness BHN/HV/HRC | Magnetic Particle (MT) | HIC – NACE TM0284 | Surface roughness (Ra) |
Bend / Flattening / Flaring | Dye Penetrant (DP/PT) | SSC – NACE TM0177 | End squareness check |
Certifications & Standards Compliance
Certification |
Standard |
Scope |
|---|---|---|
ISO 9001:2015 | QMS | Quality Management System — design, manufacture and supply |
ISO 14001 | EMS | Environmental Management System certification |
ASTM A860 | Material | Full compliance with ASTM A860 / ASME SA860 specification |
PED 97/23/EC | EU Directive | European Pressure Equipment Directive — approved manufacturer |
NACE MR0175 | Sour Service | HIC/SSC compliance for H2S environments (TM0284 / TM0177) |
MSS SP-75 | Fitting Spec | High Test Wrought Buttweld Fittings — full conformance |
ASME B16.9 | Dimensions | Factory-Made Wrought Buttwelding Fittings — dimensional compliance |
EN 10204 3.1/3.2 | Material TC | Material Test Certificate — third-party witnessed available |
Heat Treatment Requirements
All ASTM A860 WPHY grades, including WPHY 42, WPHY 46, WPHY 52, WPHY 56, WPHY 60, WPHY 65, and WPHY 70, must undergo heat treatment to achieve the required mechanical properties. Fittings produced through welding or formed at temperatures above the transformation range must be cooled to an appropriate temperature before heat treatment. Accepted treatment methods include normalizing, quench and tempering, or stress-relieving procedures in accordance with ASTM A960/A960M requirements.
Hydrostatic Testing
ASTM A860 does not mandate hydrostatic testing as a standard production requirement. However, installed fittings must be capable of withstanding a hydrostatic pressure equivalent to 100% of the material's minimum yield strength without leakage, cracking, or loss of functionality. The test pressure can be determined using the formula:
P = (2 × S × t) / D
Where:
- P = Hydrostatic test pressure
- S = Minimum specified yield strength
- t = Nominal wall thickness
- D = Outside diameter of the fitting
ASTM A860 WPHY Pipe Fittings Supply Range
Parameter | Available Range |
Material Grades | WPHY 42, WPHY 46, WPHY 52, WPHY 56, WPHY 60, WPHY 65, WPHY 70 |
Nominal Size Range | ½" to 14" (ASME B16.9), 14" to 48" (MSS SP-75) |
Wall Thickness | SCH 10, SCH 40, SCH 80, SCH 160 and custom schedules |
Pressure Ratings | Class 150, 300, 600, 900, 1500, and 2500 |
Applicable Standards | ASME B16.9, ASME B16.28, MSS SP-75 |
Manufacturing Types | Seamless, Welded, and Fabricated Butt Weld Fittings |
ASTM A860 WPHY 42 Pipe Fittings Dimensions
The dimensional requirements of ASTM A860 WPHY 42 pipe fittings are generally manufactured in accordance with ASME B16.9 and MSS SP-75 standards. Available sizes range from 1/2 inch to 12 inches and include end caps, equal tees, crosses, and stub ends for high-pressure pipeline systems.
NPS (Inch) | Outside Diameter (mm) | End Cap Length (Inch) | Tee Center-to-End (Inch) | Stub End Lap Diameter (Inch) |
1/2 | 21.3 | 1.0 | 1.0 | 1.38 |
3/4 | 26.7 | 1.0 | 1.13 | 1.69 |
1 | 33.4 | 1.5 | 1.5 | 2.0 |
2 | 60.3 | 1.5 | 2.5 | 3.63 |
4 | 114.3 | 2.5 | 4.13 | 6.19 |
6 | 168.3 | 3.5 | 5.63 | 8.50 |
8 | 219.1 | 4.0 | 7.0 | 10.63 |
10 | 273.1 | 5.0 | 8.5 | 12.75 |
12 | 323.9 | 6.0 | 10.0 | 15.0 |
ASTM A860 WPHY 42 Fittings Weight Reference
The weight of ASTM A860 WPHY 42 fittings varies according to fitting type, nominal diameter, and wall thickness schedule. Schedule 10S fittings provide a lightweight solution, while Schedule 80S fittings are preferred for higher pressure applications requiring increased wall thickness.
Fitting Type | Available Schedules |
90° Elbow | SCH 10S, SCH 40S, SCH 80S |
45° Elbow | SCH 10S, SCH 40S, SCH 80S |
Equal Tee | SCH 10S, SCH 40S, SCH 80S |
Concentric Reducer | SCH 10S, SCH 40S, SCH 80S |
Eccentric Reducer | SCH 10S, SCH 40S, SCH 80S |
Reducing Tee | SCH 10S, SCH 40S, SCH 80S |
FAQs - ASTM A860 WPHY 42 Fittings
WPHY stands for Wrought Pipe High Yield. The number 42 refers to a minimum yield strength of 42,000 psi (415 MPa). ASTM A860 covers wrought high-strength ferric steel butt-welding fittings for high-pressure gas and oil transmission. WPHY 42 is the base high-yield grade in this specification, designed to match API 5L X42 and X46 pipeline steel.
ASTM A234 WPB is the standard carbon steel fitting for moderate-pressure service with a minimum yield of only 240 MPa. WPHY 42 provides 73% higher yield strength (415 MPa), superior notch toughness, HIC resistance, and is specifically designed for high-pressure gas and oil transmission pipelines. WPB cannot substitute WPHY 42 in high-pressure applications.
WPHY 42 fittings are intended for use with API 5L Grade X42 line pipe, as well as ASTM A53 Grade B. The matching yield strength ensures the fitting is never the weak link in the pipeline.
Metinox Overseas supplies WPHY 42 fittings from 1/2" NB to 48" NB (DN 15 to DN 1200). Wall schedules include Sch 10S, 20, STD, 40S, 40, 60, 80S, 80, 100, 120, 140, 160, and XXS. Custom sizes can be manufactured to project specifications.
Yes. All ASTM A860 WPHY 42 fittings must be heat treated. Fittings formed above transformation temperature may be shipped after cooling, but those formed by welding or below transformation temperature must be normalised, quenched and tempered, or stress relieved per ASTM A960/A960M before delivery.
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