ASTM A403 Stainless Steel Butt Welding Stub End WP304/L WP310S WP316/L WP321

ASTM A403 Stainless Steel Butt Welding Stub End WP304/L WP310S WP316/L WP321

ASTM A403 Stainless Steel Butt Welding Stub End

ASTM A403 is a standard specification for wrought austenitic stainless steel pipe fittings. Within this specification, there are various types of fittings, including butt-welded fittings. A butt weld stub end is one such type of fitting covered by ASTM A403.

A butt weld stub end is used to create a welded connection between two pipes or fittings of different diameters. It is typically used when there is a need for a smooth transition between pipes or to facilitate easy disassembly of a flanged joint. The stub end has a short length of pipe with one end that is welded to the larger pipe, while the other end is intended to be used as a lap joint flange connection.

Stub end(Lap joint) is a fitting that is used replace welded flanges when the support of a rotating back up flange is required. And It can be supplied in standard and non-standard ANSI dimension that is used for connecting pipes of different diameter.

Product Information

Stub End Types

Stub end are offered in three different ways, type A, B and C. Type A and B stub end are similar to forged fittings, such as elbows and tees, and type C stub end are made in customized sizes.

Type A

The type A stub end is used for standard lap joint flange. The lap thickness on the stub end is greater than or equal to the nominal thickness of pipe wall. In addition, the outer corner radius of the type A can receive the lap joint flange. The inside corner is square. Lap usually has a machined serrated face.

Type B

The type B stub end is used for standard slip on flanges as lap flanges. The lap thickness on these short ends is greater than or equal to the nominal thickness of pipe wall. Also, the outer corner radius of type B is small enough to receive the slip o flange that can be used as a backup flange. The inner corner is square. Lap usually has a machined serrated face.

Type C

The type C stub end can be used for standard lap joint flange and slip on flange. It is flared leaving a rounded edge at the inside diameter of the lap. If necessary, the radius can be made closed to a square. The lap thickness is 75% of the pipe wall. The type C is very short enough to accommodate any backup flange. The lap joint on type C is smooth, and it is not machine.

Stub ends are usually manufactured in two ways, Type A and Type B. They are available in two standard length, long (ANSI) or short pattern (MSS).Sch5s and 10s stub end are usually offered in short lengths, and long lengths are available on special order. Sch 40s stub end are supplied in either short or long lengths.

Materials Chemical Compositions

ASTM A403 Stainless Steel Pipe Fittings refers to the material of forged and rolled austenitic stainless fittings for pressure pipes. Common grades are WP304/L, WP316/L. They can be used into many fields as engineering industry, energy conversion plants etc

Note:

Where a ellipsis(﹍)appears in the table, there is no requirement and the element need to be analyzed for or reported

The method of analysis for nitrogen shall be a matter of agreement between the purchaser and manufacturer

Columbium 0.10-0.30%; Vanadium 0.10-0.30%.

For small diameter or thin walls, or both, where many drawing passes are required, a carbon maximum of 0.04% is necessary in grades TP304L and TP316L. Small outside diameter tubes are defined as those less than 0.500in.(23.7mm) in outside diameter and light wall tubes as those less than 0.049in.(1.24mm) in average wall thickness

ASME B16.9 Stub End Dimensions (mm)