Socket-Weld Bronze Flanges Manufacturer & Exporter
Socket-weld flanges receive the pipe in a machined recess and are joined with a single fillet joint at the hub. The bore matches the pipe inside diameter, which keeps the flow path smooth in small-bore lines.
Product Overview
The pipe seats in the socket against a shoulder, then the joint is made at the hub. Compared with a slip-on flange, the insertion depth is fixed by the machined socket. That repeatability is useful in small-bore process, lubrication and instrument piping where many identical joints are made.
Product specification
SM-PRD-SOC| Parameter | Specification |
|---|---|
| Product | Bronze socket-weld flange |
| Materials | UNS C93200, C95400, C95500, C95800, C63000, C83600, C84400 |
| Socket | Bore and depth per pipe OD and drawing |
| Dimensional basis | Applicable standard or customer drawing |
| Pressure class | Class 150 / 300 or per drawing, as applicable |
| Facing | FF / RF / custom |
| Joint to pipe | Welded (aluminium bronzes) or brazed (leaded grades), per specification |
| Marking | MSS SP-25 pattern or customer requirement |
| Documentation | MTC and inspection documents as applicable |
Technical Description
Gap allowance at the socket shoulder, filler metal and welding or brazing procedure are defined by the piping specification. Aluminium bronze grades (C95400, C95500, C95800, C63000) are welded to qualified procedures; leaded grades (C83600, C84400, C93200) are generally brazed, because lead makes fusion welding of these alloys unreliable. Socket joints are commonly used in small bore; the designer decides whether the joint suits cyclic or high-vibration duty.
Construction
- Socket bore sized for the pipe OD, with a machined shoulder at the specified depth
- Through-bore matched to pipe inside diameter
- Hub profile for the fillet joint
- Flat or raised face; drilling to class pattern or drawing
- Optional counterbore at the socket mouth
Available Materials
Available materials
SM-MAT-SOC| Grade | Alloy | Stock and specification | Fit for this flange |
|---|---|---|---|
| UNS C93200 | Leaded tin bronze (SAE 660) | Cast: ASTM B584 / B271 / B505 | Machinability suits socket and bore work; brazed joints |
| UNS C95400 | Aluminium bronze | Cast: ASTM B148 / B271 / B505 | Weldable aluminium bronze for small-bore process and seawater lines |
| UNS C95500 | Nickel aluminium bronze | Cast: ASTM B148 / B271 / B505 | Higher-strength small-bore connections |
| UNS C95800 | Nickel aluminium bronze (NAB) | Cast: ASTM B148 / B271 / B505 | Seawater service; welding to qualified procedure |
| UNS C63000 | Wrought nickel aluminium bronze | Bar, forging, plate: ASTM B150 / B124 / B283 / B171 | Wrought bar or forging stock |
| UNS C83600 | Leaded red brass / gunmetal | Cast: ASTM B62 / B584 | General service; brazed joints |
| UNS C84400 | Leaded semi-red brass | Cast: ASTM B584 | General valve-composition service; brazed joints |
Stock form and the governing specification depend on grade and size. Mechanical properties are in the data page for each grade.
Dimensions and Sizes
Dimensions to confirm in the RFQ are listed below. Socket depth and bore are the controlling features; they follow the standard or the pipe schedule you supply.
Dimensions to confirm
SM-DIM-SOC| Dimension | Basis |
|---|---|
| Socket bore and depth | Per pipe OD and drawing |
| Through-bore | Matched to pipe ID or drawing |
| Hub OD and length | Per standard or drawing |
| Flange OD, thickness | Class table or drawing |
| Bolt circle (PCD) | Class pattern or drawing |
| Bolt holes | Count and diameter per class or drawing |
Sizes
Socket-weld flanges are generally used in the smaller nominal sizes. State NPS, pipe schedule or OD and wall, and class in the RFQ.
Pressure Classes
Socket-weld flanges are typically specified at Class 150 or Class 300 in copper alloys. The permitted pressure depends on alloy, temperature, joint quality and the governing standard; confirm the class and the joint procedure with the piping specification.
Facing Options
Raised face and flat face are available, with the contact finish per MSS SP-6 or your stated roughness.
Applications
- Small-bore seawater and cooling-water branches
- Lubrication and fuel-oil lines
- Instrument and sampling connections
- Process skids with repeatable joints
Manufacturing
Cast or wrought blanks are bored and counterbored to form the socket and shoulder, then turned for hub, face and OD, and drilled. Socket depth is verified to drawing before release.
Inspection and Documentation
Socket diameter and depth, through-bore, face finish, PCD and hole pattern are inspected. Material verification and MTC are provided where required; weld or braze procedure approval and NDT belong to the fabricator unless specified on the purchase order.
Custom Requirements
Custom socket depth, counterbores, reduced through-bores, special hub lengths and non-standard drilling.
Socket-Weld Flanges: common questions
Can leaded bronze socket-weld flanges be welded?
Leaded grades such as C83600, C84400 and C93200 are generally brazed rather than fusion welded, because lead makes welding these alloys unreliable. Aluminium bronzes are welded to qualified procedures.
What size range suits socket-weld flanges?
Socket-weld flanges are generally used in smaller nominal sizes. State the NPS, pipe OD and wall, and class in the RFQ.
Which dimensions control a socket-weld flange?
Socket bore and depth are the controlling features, followed by the through-bore, hub dimensions and bolt pattern.
Related Information
Have a Drawing or Flange Specification?
Send your drawing, material grade, dimensions and quantity to our technical sales team.