MSS SP-75 High-Strength Butt-Welding Fittings A860 WPHY 52/60/65/70

ASTM A860 WPHY GR 65 Pipe Fittings, MSS SP 75 ElbowDownload

Product Introduction

C&N offers a complete range of high-strength, low-temperature tough butt-welding fittings strictly compliant with MSS SP-75 and ASME B16.9 standards. This series includes long-radius elbows, equal/reducing tees, and concentric/eccentric reducers, specifically designed for high-pressure, low-temperature, and corrosive pipeline systems in petrochemical, LNG, offshore platforms, and power generation industries.

C&N MSS SP 75 ASTM A860 WPHY 65 NACE MR0175 Elbows

Core Product Specifications

Product Types: Elbows, Tees, Reducers
Size Range: ½″ to 48″, wall thickness SCH20 to SCH160 and special thicknesses
Material Grades: ASTM A860 WPHY 52 / 60 / 65 / 70 (high-strength low-alloy fine-grained steel)
Manufacturing Standard: MSS SP-75 (Specification for High-Strength Wrought Butt-Welding Fittings)
Design Standard: ASME B16.9 (Factory-Made Wrought Butt-Welding Fittings)
Inspection Requirements: Charpy impact testing at −46°C, 100% non-destructive testing (UT/RT), hydrostatic testing, dimensional verification via 3D laser scanning

Material Chemical Composition (ASTM A860 WPHY Series)

Element	Content (%)
Carbon (C)	≤ 0.20
Manganese (Mn)	1.00–1.45
Phosphorus (P)	≤ 0.030
Sulfur (S)	≤ 0.010
Silicon (Si)	0.15–0.40
Nickel (Ni)	≤ 0.50
Chromium (Cr)	≤ 0.30
Molybdenum (Mo)	≤ 0.25
Copper (Cu)	≤ 0.35
Vanadium (V)	≤ 0.10
Carbon Equivalent (CE)	≤ 0.42

Material Mechanical Properties (ASTM A860 WPHY Series)

Grade	Yield Strength (min) ksi [MPa]	Tensile Strength (min) ksi [MPa]	Elongation (min) %	Charpy Impact (−46°C)
WPHY 52	52 [360]	66 [455]	≥ 25	Meets MSS SP-75
WPHY 60	60 [415]	75 [515]	≥ 23	Meets MSS SP-75
WPHY 65	65 [450]	77 [530]	≥ 22	Meets MSS SP-75
WPHY 70	70 [485]	82 [565]	≥ 20	Meets MSS SP-75

Key Manufacturing Processes

Hot Induction Bending: Ensures uniform wall thickness and smooth inner surfaces, minimizing flow resistance.
Hydraulic Bulging / Welded Forming: Guarantees shoulder strength and dimensional accuracy for tees.
Heat Treatment (Normalizing / Quenching & Tempering): Refines grain structure for superior low-temperature toughness.
100% Non-Destructive Testing: UT/RT and 3D laser scanning ensure full compliance.
Precision Bevel Machining: CNC-processed bevels for consistent fit-up and high-quality field welding.

Main Application Areas

Liquefied natural gas (LNG) pipelines and terminals
Petrochemical and refining high-pressure systems
Offshore platform piping
Power plant high-pressure steam lines
Pulp & paper, mining, and other high-load/corrosive environments

ASTM A860 WPHY 65 MSS SP 75 90DEG LR NACE MR0175 Elbow Dimension Measurement

MSS SP 75 THK ASTM A860 WPHY 65 NACE MR0175 ECC REDUCER Hardness est — ASTM A860 WPHY 65 MSS SP 75 90DEG LR NACE MR0175 Elbow Dimension Measurement

C&N Product Advantages

Outstanding Low-Temperature Toughness: Passes −46°C Charpy impact testing, ideal for cryogenic service.
High Strength & Pressure Rating: Reliable performance in extreme high-pressure conditions.
Excellent Weldability: Low carbon equivalent typically eliminates post-weld heat treatment.
Precise Dimensions & Easy Installation: Strict ASME B16.9 tolerances reduce assembly time and costs.
Complete Quality Assurance: Full traceability, 100% NDT, professional moisture-proof and rust-preventive packaging.

Selection & Installation Guidelines

Select appropriate grade (WPHY 52/60/65/70) according to design pressure, temperature, and medium.
Clean bevels thoroughly before welding; use low-hydrogen electrodes and control interpass temperature.
Avoid forced alignment during installation; use line-up clamps and pressurize gradually during testing.