What Kinds of Elbows Are Made?

Elbow as the main pipe to change the direction of the pipe fittings, you can often see in daily life, such as home water pipes, floor heating, will be used, just different materials, of course, there are not common in the petrochemical industry and other fields will also use the elbow, as a stainless steel and carbon steel elbow manufacturers, today Yaofa will introduce you to the elbow production methods.

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Elbow production

1. Hot push forming

Hot push forming in the production of elbows, the use of more of a pushing machine, core mold and heating equipment, after the material billet set in the core mold, while pushing, while heating, while forming, this way of production speed, suitable for mass production, and the manufacture of elbows, beautiful appearance, thickness is also relatively uniform, generally our manufacturers usually use this method for most of the carbon steel elbow.

2. Stamping forming

Stamping forming in the elbow production method, the number of times used is also more, depending on the material can choose cold pressing or hot pressing, the billet into the outer die, the upper and lower die merged, in the press, the billet along the inner and outer die reserved for the gap movement and complete the forming process.

3. Plate welding

Plate welding system in the elbow production method, for large elbow production, first cut two pieces of plate, then pressed into half of the elbow profile, and then the two profiles welded together. The elbow manufactured in this way will have two welds, so our manufacturers have to test the welds and meet the standards before they leave the factory.

The above are the 3 kinds of elbow production methods commonly used by manufacturers. Whenever customers place orders, manufacturers will quickly classify the elbow according to the elbow material and equipment capacity, and choose the appropriate elbow production method.

Cangzhou Yaofa Pipeline Equipment Co., Ltd. is a professional enterprise dedicated to the supply of pipe fittings for the power, petroleum, chemical, thermal, shipbuilding, coal, water conservancy, boiler, pharmaceutical, construction and other industries.

ASTM A234

This specification covers wrought carbon steel & alloy steel fittings of seamless and welded construction. Unless seamless or welded construction is specified in order, either may be furnished at the option of the supplier. All welded construction fittings as per this standard are supplied with 100% radiography. Under ASTM A234, several grades are available depending upon chemical composition. Selection would depend upon pipe material connected to these fittings.

Tensile Requirements

WPB

WPC, WP11CL2

WP11CL1

&#;WP11CL3

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Tensile Strength, min, ksi[MPa] 60-85 70-95 60-85 &#;

75-100

(0.2% offset or 0.5% extension-under-load) [415-585] [485-655] [415-585] &#;

[520-690]

Yield Strength, min, ksi[MPa] 32 40 30 45 [240] [275] [205] [310]

Some of the grades available under this specification and corresponding connected pipe material specification are listed below:

ASTM A403

This specification covers two general classes, WP & CR, of wrought austenitic stainless steel fittings of seamless and welded construction.
Class WP fittings are manufactured to the requirements of ASME B16.9 & ASME B16.28 and are subdivided into three subclasses as follows:

• WP &#; SManufactured from seamless product by a seamless method of manufacture.
• WP &#; W These fittings contain welds and all welds made by the fitting manufacturer including starting pipe weld if the pipe was welded with the addition of filler material are radiographed. However no radiography is done for the starting pipe weld if the pipe was welded without the addition of filler material.
• WP-WX These fittings contain welds and all welds whether made by the fitting manufacturer or by the starting material manufacturer are radiographed.

Class CR fittings are manufactured to the requirements of MSS-SP-43 and do not require non-destructive examination.

Under ASTM A403 several grades are available depending upon chemical composition. Selection would depend upon pipe material connected to these fittings. Some of the grades available under this specification and corresponding connected pipe material specification are listed below:

ASTM A420

This specification covers wrought carbon steel and alloy steel fittings of seamless & welded construction intended for use at low temperatures. It covers four grades WPL6, WPL9, WPL3 & WPL8 depending upon chemical composition. Fittings WPL6 are impact tested at temp &#; 50° C, WPL9 at -75° C, WPL3 at -100° C and WPL8 at -195° C temperature.

The allowable pressure ratings for fittings may be calculated as for straight seamless pipe in accordance with the rules established in the applicable section of ASME B31.3.

The pipe wall thickness and material type shall be that with which the fittings have been ordered to be used, their identity on the fittings is in lieu of pressure rating markings.

Steel No.

Type

Chemical composition

C

Si

S

P

Mn

Cr

Ni

Mo

Other

ób

ós

δ5

HB

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WPL6 0.3 0.15-0.3 0.04 0.035 0.6-1.35 0.3 0.4 0.12 Cb:0.02;V:0.08 415-585 240 22 WPL9 0.2 0.03 0.03 0.4-1.06 1.6-2.24 435-610 315 20 WPL3 0.2 0.13-0.37 0.05 0.05 0.31-0.64 3.2-3.8 450-620 240 22 WPL8 0.13 0.13-0.37 0.03 0.03 0.9 8.4-9.6 690-865 515 16