Stainless Steel · Fittings · ASTM A403 WP904L
SS 904L Stainless Steel Fittings
In short: SS 904L butt-weld fittings to ASTM A403 WP904L, and forged fittings, complete SS 904L acid piping systems.
- N08904
- UNS number
- 8
- density, g/cm³
- 3.1 / 3.2
- EN 10204 certificates
- 6
- SS 904L product forms
Why this combination
Why SS 904L in fittings
Turbulence at elbows and tees accelerates acid attack, so matching the pipe grade matters.
Specify the schedule and fitting class to match the pipe.
Specification
How to specify SS 904L fittings
Butt-weld ½" – 48" (larger fabricated to order) in schedules matching the pipe; socket-weld and threaded ⅛" – 4" in Class 2000, 3000, 6000 and 9000
- Specification
- ASTM A403 WP904L
- UNS
- N08904
- EN / W.Nr.
- 1.4539
- Butt-weld
- A403 WP904L, ASME B16.9
Sizes and weights
SS 904L fittings sizes, weighed at 8 g/cm³
Other sizes on request. For general fittings information, such as manufacturing routes and end finishes, see the fittings guide.
Butt-weld ½" – 48" (larger fabricated to order) in schedules matching the pipe; socket-weld and threaded ⅛" – 4" in Class 2000, 3000, 6000 and 9000
Chemistry
SS 904L composition
- UNS
- N08904
- EN / W.Nr.
- 1.4539 · X1NiCrMoCu25-20-5
- Density
- 8 g/cm³
- PREN
- 32 – 36
| Element | Limit, % | Why it matters |
|---|---|---|
| C | 0.020 max | |
| Mn | 2.00 max | |
| P | 0.045 max | |
| S | 0.035 max | |
| Si | 1.00 max | |
| Cr | 19.0 – 23.0 | |
| Ni | 23.0 – 28.0 | |
| Mo | 4.0 – 5.0 | |
| Cu | 1.0 – 2.0 | |
| N | 0.10 max |
Limits per ASTM A240; other product forms and specifications differ slightly. Your order's specification and edition govern.
Questions
About SS 904L fittings
Are SS 904L fittings stocked?
Common sizes are available; others made to order.
Which schedule?
To match the pipe, typically 10S or 40S.
From enquiry to dispatch
How a SS 904L fittings order runs
- 01 EnquiryGrade, specification, size, quantity
- 02 ReviewChecked against your standard
- 03 InspectPMI, dimensions, TPI if required
- 04 CertifyEN 10204 3.1 / 3.2, heat traceable
- 05 ShipPacked and documented for the destination
Need SS 904L fittings?
Send size, quantity, specification and destination. We reply with availability, certificates and delivery.