17-4 PH Stainless Steel Pipe Fittings

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Precipitation-hardening stainless steel is the speciality around which Metracore Alloys has built its fittings production. We manufacture 17-4 PH Stainless Steel Pipe Fittings from grade UNS S17400, a martensitic alloy whose copper and niobium additions respond to a single ageing treatment after solution annealing. Tensile strength reaches 1310 MPa in the H900 condition. Hardness climbs to 40 HRC, yet the grade still resists corrosion in most industrial media. Aerospace programmes, oil and gas operators, petrochemical plants, power stations, marine yards, and chemical processors specify these fittings where mechanical performance decides the selection. On this page you’ll find the product definition, specifications, fitting types, composition limits, mechanical values for both aged conditions, features, applications, available standards, advantages, and the reasons buyers order from us, with FAQs at the end. Our ISO-certified production covers 1/2 NB through 24 NB with EN 10204 3.1 certification on every batch. Share your dimensions and quantities to receive a manufacturing quotation.

What are 17-4 PH Stainless Steel Pipe Fittings?

17-4 PH Stainless Steel Pipe Fittings are pipe connection components made from precipitation-hardening martensitic stainless steel, designated UNS S17400. The alloy contains 15.0 to 17.5% chromium with 3.0 to 5.0% each of nickel and copper. Niobium at 0.15 to 0.45% joins copper in forming fine precipitates during ageing. Those particles lift strength and hardness sharply. Corrosion resistance is better than the 400 series martensitic grades and approaches, but does not match, grade 304 in most environments. SS 17-4 PH Pipe Fittings machine cleanly in the solution-annealed state and weld without special preparation. Strength holds through repeated load cycles, extending service life in pressure equipment. Continuous service above 316°C isn’t recommended; prolonged exposure over-ages the structure and lowers strength.

Why Choose Metracore Alloys?

Metracore Alloys manufactures every fitting in-house under an ISO-certified quality system, so specification control runs from raw material to final inspection. Custom sizes come off the same production line as catalogue items. Third-party inspection agencies are welcome at any stage, and each consignment carries its EN 10204 3.1 Mill Test Certificate. Pricing stays competitive because we produce rather than resell. Ready stock in popular sizes shortens project schedules, and our despatch team arranges fast global shipping. Send your enquiry with sizes, schedule, and aged condition, and we’ll confirm price and delivery.

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Table of Content

Specifications of 17-4 PH Stainless Steel Pipe Fittings

The table below sets out our manufacturing range for UNS S17400 Pipe Fittings: grade identity, dimensions, schedules, inspection, and certification for procurement reference.

Types of 17-4 PH Stainless Steel Pipe Fittings

We manufacture ten standard configurations. 17-4 PH Buttweld Pipe Fittings cover elbows, tees, reducers, crosses, and bends, while 17-4 PH Forged Pipe Fittings serve socket weld connections.

Reach out to Metracore Alloys for reliable 17-4 PH Stainless Steel Pipe Fittings

Technical Details of 17-4 PH Stainless Steel Pipe Fittings

Chemical Composition

Chemical composition of grade UNS S17400 follows the limits given in ASTM A403 / ASTM A484 for the source material. Copper and niobium are the two additions that make precipitation hardening possible.

Element	Content (%)
Chromium	15.0 to 17.5
Nickel	3.0 to 5.0
Copper	3.0 to 5.0
Niobium (Columbium)	0.15 to 0.45

Mechanical Properties

Mechanical values depend on the ageing condition. H900 gives peak strength, while H1150 trades hardness for greater ductility and toughness.

Property	Condition H900	Condition H1150
Tensile Strength	1310 MPa min	930 MPa min
Yield Strength (0.2%)	1170 MPa min	724 MPa min
Elongation	10% min	16% min
Hardness	40 HRC min	28 HRC min
Density	7.75 g/cm³	7.75 g/cm³

Available Standards

ASTM A403 17-4 PH Pipe Fittings are produced under the wrought fittings specification, with ASTM A960 governing the common requirements across the range. ASME SA403 17-4 PH Pipe Fittings meet the boiler and pressure vessel adoption of the same document. ASME B16.9 sets dimensions for standard buttweld sizes. Short-radius elbows and returns fall under ASME B16.28, and light-wall fittings, these fittings follow MSS SP-43. Our inspectors verify each applicable standard at final inspection before despatch. Test reports quote the governing edition of every document applied during manufacture, marking, and final testing.

Features of 17-4 PH Stainless Steel Pipe Fittings

Nine working characteristics set 17-4 PH Stainless Steel Fittings apart from common austenitic connectors; each traces back to the aged martensitic structure.

High strength-to-weight ratio. The aged alloy carries greater load per unit mass than standard grades.
Hardness with toughness. 40 HRC arrives at H900 without brittle behaviour.
Corrosion resistance holds near grade 304 in atmospheric, freshwater, and mild chemical service.
Wear resistance protects sealing faces and mating surfaces in valves.
Fatigue strength stays high through pressure and vibration cycles.
Heat treatable. One ageing cycle between 482°C and 621°C tunes strength to the duty.
Welding presents few problems, and post-weld ageing restores joint strength.
Long service life follows from pairing strength with corrosion performance.
Ageing doesn’t distort finished parts, so machined tolerances survive heat treatment.

Advantages of 17-4 PH Stainless Steel Pipe Fittings

Six commercial and engineering gains follow when a project adopts this precipitation-hardening grade; each affects lifetime cost.

Mechanical strength above austenitic levels permits thinner walls at equal pressure rating.
Corrosion resistance suits media that would pit carbon steel connectors.
Wear and fatigue resistance stretch overhaul intervals on cycling equipment.
Machining and welding proceed with standard workshop practice.
Maintenance demand drops because hardened surfaces resist erosion and galling.
Long-term performance in demanding applications protects the piping investment.

Manufacturing Process of 17-4 PH Stainless Steel Pipe Fittings

17-4 PH Stainless Steel Pipe Fittings Application

Eight industries drive the demand: aerospace, oil and gas, petrochemical, power, marine, chemical processing, pulp and paper, and valve and pump manufacturing.

Exporter, Manufacturer & Supplier of 17-4 PH Stainless Steel Pipe Fittings in various material and sizes.

FAQs

What are 17-4 PH Stainless Steel Pipe Fittings?

17-4 PH Stainless Steel Pipe Fittings are precipitation-hardened UNS S17400 connectors for pipelines needing high strength with corrosion resistance.

What is the difference between 17-4 PH and 304 stainless steel pipe fittings?

The main difference is strength: aged 17-4 PH reaches 1310 MPa tensile strength against a 515 MPa minimum for 304, with broadly comparable corrosion resistance.

Which standards are followed for 17-4 PH Stainless Steel Pipe Fittings?

Production follows ASTM A403 / ASME SA403 with ASTM A960, and dimensions comply with ASME B16.9, ASME B16.28, and MSS SP-43.

Are 17-4 PH pipe fittings heat treatable?

Yes, they are. A single ageing anywhere from 482°C up to 621°C sets strength, from peak-hardness H900 to tougher H1150.

Which industries use 17-4 PH Stainless Steel Pipe Fittings?

Aerospace programmes, petrochemical and power plants, oil and gas fields, marine yards, chemical processors, pulp mills, and valve makers use them.

Are buttweld and forged 17-4 PH fittings available?

Both are available. We manufacture the full buttweld range alongside forged socket weld fittings in every supply condition.

What sizes are available in 17-4 PH pipe fittings?

Sizes run from 1/2 NB to 24 NB in schedules from Sch 10S to Sch 160, including XXS wall.

Do you provide custom dimensions and specifications?

Yes, our production team makes non-standard bores, walls, and aged conditions as per customer specifications.

Are Mill Test Certificates (MTC) provided with the fittings?

Every consignment ships with an EN 10204 3.1 certificate reporting chemistry, mechanical results, and heat treatment condition.

Do you export 17-4 PH Stainless Steel Pipe Fittings worldwide?

Yes, we ship worldwide by sea and air, with secure export packaging.