Stainless Steel · Fittings · ASTM A403 WP304L
SS 304L Stainless Steel Fittings
In short: SS 304L fittings: butt-weld to ASTM A403 WP304L and forged socket-weld or threaded to A182 F304L. They match SS 304L pipe so the whole welded system has the same low-carbon chemistry.
- S30403
- UNS number
- 7.93
- density, g/cm³
- 3.1 / 3.2
- EN 10204 certificates
- 7
- SS 304L product forms
Why this combination
Why SS 304L in fittings
A low-carbon pipe system is only as good as its fittings. WP304L elbows, tees and reducers keep every weld joint in the line free from sensitisation.
Check the schedule matches the pipe and the fitting class (WP-S seamless or WP-W welded) matches your piping specification.
Specification
How to specify SS 304L 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 WP304L (butt-weld); A182 F304L (forged)
- UNS
- S30403
- EN / W.Nr.
- 1.4307
- Butt-weld
- A403 WP304L, ASME B16.9
- Forged
- A182 F304L, ASME B16.11
Sizes and weights
SS 304L fittings sizes, weighed at 7.93 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 304L composition
- UNS
- S30403
- EN / W.Nr.
- 1.4307 · X2CrNi18-9
- Density
- 7.93 g/cm³
- PREN
- 18 – 20
| Element | Limit, % | Why it matters |
|---|---|---|
| C | 0.030 max | |
| Mn | 2.00 max | |
| P | 0.045 max | |
| S | 0.030 max | |
| Si | 0.75 max | |
| Cr | 17.5 – 19.5 | |
| Ni | 8.0 – 12.0 | |
| 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 304L fittings
Can I use WP304 fittings on SS 304L pipe?
Only if your specification allows it. For corrosive service, the low-carbon fitting is the correct match.
Are dual WP304/304L fittings available?
Yes, dual-certified fittings are common.
From enquiry to dispatch
How a SS 304L 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 304L fittings?
Send size, quantity, specification and destination. We reply with availability, certificates and delivery.