Stainless Steel · Fittings · ASTM A403 WP316
SS 316 Stainless Steel Fittings
In short: SS 316 fittings: butt-weld to ASTM A403 WP316 and forged to A182 F316, matching SS 316 pipe for chemical, marine and pharmaceutical lines.
- S31600
- UNS number
- 8
- density, g/cm³
- 3.1 / 3.2
- EN 10204 certificates
- 7
- SS 316 product forms
Why this combination
Why SS 316 in fittings
Fittings in a chloride-bearing line see the same attack as the pipe, often worse at turbulent elbows and tees. Matching SS 316 keeps corrosion performance uniform.
Dual WP316/316L fittings suit welded systems.
Specification
How to specify SS 316 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 WP316 (butt-weld); A182 F316 (forged)
- UNS
- S31600
- EN / W.Nr.
- 1.4401
- Butt-weld
- A403 WP316, ASME B16.9
- Forged
- A182 F316, ASME B16.11
Sizes and weights
SS 316 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 316 composition
- UNS
- S31600
- EN / W.Nr.
- 1.4401 · X5CrNiMo17-12-2
- Density
- 8 g/cm³
- PREN
- 23 – 25
| Element | Limit, % | Why it matters |
|---|---|---|
| C | 0.08 max | |
| Mn | 2.00 max | |
| P | 0.045 max | |
| S | 0.030 max | |
| Si | 0.75 max | |
| Cr | 16.0 – 18.0 | |
| Ni | 10.0 – 14.0 | |
| Mo | 2.00 – 3.00 | |
| 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 316 fittings
What fittings match SS 316 pipe?
A403 WP316 butt-weld and A182 F316 forged fittings in the pipe's schedule.
Are seamless fittings better?
WP-S fittings avoid weld seams; WP-W fittings are fully examined and widely accepted.
From enquiry to dispatch
How a SS 316 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 316 fittings?
Send size, quantity, specification and destination. We reply with availability, certificates and delivery.