ASTM A860 High-Strength Butt Welding Pipe Fittings | WPHY 52, 60, 65, 70
ASTM A860 covers high-yield-strength ferritic steel butt-welding pipe fittings, manufactured in seamless, welded, or fabricated construction, for use in high-pressure oil & gas transmission and distribution systems.
We supply ASTM A860 WPHY 52, WPHY 60, WPHY 65, and WPHY 70 fittings, fully compliant with ASME B16.9, MSS SP-75, and project specifications.
ASTM A860 Specification Overview
ASTM A860 applies to wrought high-strength carbon steel fittings designed for demanding pipeline applications.
- Manufacturing: Seamless / Welded / Fabricated
- Standards: ASME B16.9, B16.28, MSS SP-75
- Application: High-pressure oil & gas pipelines
For non-standard fittings, requirements follow ASTM A960/A960M Supplementary Requirement S58.
ASTM A860 Grades (WPHY Series)
| Grade | Yield Strength |
|---|---|
| WPHY 42 | ≥ 42 ksi |
| WPHY 46 | ≥ 46 ksi |
| WPHY 52 | ≥ 52 ksi |
| WPHY 60 | ≥ 60 ksi |
| WPHY 65 | ≥ 65 ksi |
| WPHY 70 | ≥ 70 ksi |
👉 WPHY = Wrought Pipe High Yield
Product Range
We manufacture and supply:
- Elbows (LR / SR)
- Tees (Equal & Reducing)
- Reducers (Concentric / Eccentric)
- Caps
- Custom fittings
Example: ASTM A860 WPHY52 Tee (MSS SP-75)
Dimensions & Thickness
- Standards: ASME B16.9, B16.28, MSS SP-75
- Size Range: Up to NPS 60
- Thickness:
Sch 10, 20, 40, STD, 60, 80, XS, 100–160, XXS
ASTM A860 Chemical Composition
ASTM A860 fittings are made from fully killed steel with controlled composition.
- Carbon (C): ≤ 0.30
- Phosphorus (P): ≤ 0.035
- Sulfur (S): ≤ 0.035
- Alloy elements: As required
✔ Product analysis is performed per heat
✔ Conforms to ASTM A960/A960M tolerances
✔ Testing in accordance with ASTM A751
👉 All WPHY grades share similar base composition with controlled variations.
Mechanical Properties (ASTM A370)
- Tensile testing required per heat
- Specimens taken after final heat treatment
| Property | Requirement |
|---|---|
| Yield Strength | 42–70 ksi (by grade) |
| Tensile Strength | Higher than yield |
| Elongation | As specified |
Notch Toughness (Impact Testing)
ASTM A860 fittings must meet strict low-temperature toughness requirements:
- Test method: Charpy V-notch
- Test temperature: −50°F (−46°C)
- Tests include:
- Base metal (3 specimens)
- Weld metal (3 specimens)
✔ Specimens aligned with metal flow direction
✔ Full-size specimens preferred
Hardness Requirements
- Maximum hardness: 22 HRC (235 HBW)
👉 Critical for sour service (H₂S environments) to prevent cracking.
Heat Treatment
All ASTM A860 fittings must be heat treated:
- Normalizing
- Quenching & Tempering (Q&T)
- Stress relieving
Requirements per ASTM A960/A960M:
- Cooling below critical temperature before heat treatment
- Controlled furnace conditions
- Full heat treatment records
Dimensional Standards
- NPS ≤ 14 → ASME B16.9
- NPS 14–60 → MSS SP-75
Applications
ASTM A860 fittings are widely used in:
- Oil & gas transmission pipelines
- Offshore platforms
- Petrochemical plants
- High-pressure pipeline systems
- Sour service pipelines
Why Choose Our ASTM A860 Fittings?
✔ Full compliance with ASTM A860 / MSS SP-75
✔ EN 10204 3.1 certification
✔ Complete NDT (UT, RT, MT, PT)
✔ Low-temperature impact testing
✔ NACE MR0175 compliance available
✔ Custom manufacturing capability
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ASTM A860 WPHY 70 Pipe Fittings
