UNS S31803 Butt Weld Cap

What is UNS S31803 Butt Weld Cap

UNS S31803 butt weld cap have called Plug in different field, it usually welded to the pipe end or mounted on the external thread of the pipe end to cover the pipe fittings. To close the pipeline so the function is the same as the pipe plug. We will introduce UNS S31803 Butt Weld Cap this times below.

The steel cap have different shapes, such as hemispherical cap, elliptical cap, dish cap, and spherical cap. From the point of view of force, the hemispherical cap is gradually not good to manufacture, but it is gradually manufactured from the viewpoint of manufacturing difficulty.

In many projects, you can use a blind plate to close the pipeline as well, the different thing is the blind plate is detachable and the welded steel cap is not removable. The UNS S31803 Butt Weld Cap have more benefits in mechanical properties and use commonly now. The cap includes a convex cap, a conical shell, a variable diameter section, a flat cover and a constricted opening.

Dimension of ASME B16.9 Butt Weld Cap

UNS S31803 butt Weld steel pipe cap is the butt weld type of fittings, connecting methods is to use butt welding. BW cap ends in beveled or plain.

Dimensions ranges:

From 1/2" to 24" , till up to 48".

Thickness ranges:

From SCH 10, SCH 20, SCH 40, SCH STD, SCH 80, SCH XS to SCH 160.

Standard Of Butt Weld Cap

The standard of butt weld cap is ASME/ANSI B16.9 which is also available for other butt weld fittings.

This standard covers the dimensions and the tolerances of carbon, alloy and stainless-steel butt weld fittings. It also covers all dimensions, tolerances, ratings, testing, and marking for factory-made.

ASME 16.9 Steel pipe caps are usually welded onto end of pipe that blcok off the piping line system, it has same funtion with plugs and blind flanges. It is available in material of carbon steel, stainless steel and alloy steel.

Butt weld cap dimensions is from 1/2" to 48" and thickness covers Sch 10S, Sch 40, Sch 80, Sch 160, STD, XS, XXS. We can manufacture Stainless steel 304/L Butt weld cap in stanadrd of ASME B16.9, MSS SP 43, DIN, JIS and EN.

Chemical of Material UNS 31803

UNS S31803 Butt Weld Cap is a key alloy in the growing steel industry. It is composed of 22% chromium, 3% molybdenum, 5-6.5% nickel, and trace amounts of other elements such as manganese, nitrogen, phosphorus, silicon, and sulfuric acid,details as below:

Material Grade of Butt Weld End Cap

Carbon Steel Cap

ASTM A234 WPB/WPC, ASTM A420 WPL6, ASTM A860 WPHY 42 / 46 / 56 / 60 / 65

Alloy Steel Cap

ASTM A234 WP11 / WP12 / WP5 / WP9 / WP22 / WP91 / WP92, 15CrMoG,12Cr1MoVG, 12Cr5Mo, 1Cr5Mo, Cr9Mo, 10CrMo910, 12CrMo4-5

Stainless Steel Cap

ASTM A403 WP304/304L/304H, 316/316L, 310S, 317, 347, 904L, A815 S32205, S31803, S32750, S32760

Inspection of UNS S31803 Butt Weld Cap

(1)Visual the surface of UNS S31803 butt weld cap body. Such as dents, die marks, porosity, undercuts.

(2)Check the marking. Such as size, material code, material grade, thickness, heat no.

(3)Measure dimensions. Such as outside diameter, wall thickness, height from end to end.

(4)Test chemical properties of stainless steel butt weld cap.

The various inspections & testing are carried out on pipe fitting to ensure the quality of the product. We offer profession inspection service for our client such as inspect dimension,schedule,surface and PMI. For example, we provided the MTC of UNS S31803 Butt Weld Cap and client is satisfied with our service.