Shandong JINBAICHENG Metal Materials Co., Ltd

Carbon Black Steel/Stainless Steel Seamless Steel Pipe Fittings Elbow

Short Description:

Carbon Steel: ASTM/ASME A234 WPB, WPC

Alloy: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911, 15Mo3 15CrMoV, 35CrMoV


Product Detail

Product Tags

By material

Carbon Steel: ASTM/ASME A234 WPB, WPC

Alloy: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911, 15Mo3 15CrMoV, 35CrMoV

Stainless Steel:ASTM/ASME A403 WP 304-304L-304H-304LN-304N

ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti

ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H

Low temperature steel:ASTM/ASME A402 WPL3-WPL 6

High performance steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70

Cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon chrome leaching, PVC, PPR, RFPP (reinforced polypropylene), etc.

Product Display

Elbow3
Elbow2

Processes

Seamless elbow: Elbow is a kind of pipe fittings used in the bend of the pipe. In the pipeline system used in the entire pipe fittings, the largest proportion, about 80%. Usually, different forming processes are selected for elbows of different materials or wall thicknesses. Manufacturing plants commonly used seamless elbow forming process are hot push, stamping, extrusion, etc.

Hot push forming

Hot push elbow forming process is the use of special elbow pushing machine, core mold and heating device, so that the set of billet on the mold in the pushing machine to push forward the movement, in the movement is heated, expanded and bent into the process. The deformation characteristics of the hot push elbow is based on the law of plastic deformation of metal materials before and after the volume of the billet diameter, the diameter of the billet used is less than the diameter of the elbow, through the core mold to control the deformation process of the billet, so that the inner arc of the compressed metal flow to compensate for the expansion and thinning of other parts, so as to obtain a uniform wall thickness of the elbow.

Hot push elbow forming process has a beautiful appearance, uniform wall thickness and continuous operation, suitable for mass production, thus becoming the main forming method of carbon steel, alloy steel elbow, and also applied in the forming of certain specifications of stainless steel elbow.

Forming process heating methods are medium frequency or high frequency induction heating (heating circle can be multi-turn or single-turn), flame heating and reflection furnace heating, the use of which heating method depending on the requirements of the forming product and energy situation.

Stamping

Stamping forming elbow is the earliest used in the mass production of seamless elbow forming process, in the production of commonly used specifications elbow has been replaced by hot push method or other forming process, but in some specifications of the elbow due to the production of small quantities, wall thickness too thick or too thin.

The product is still in use when there are special requirements. Elbow stamping and forming using the elbow outside diameter equal to the billet, the use of presses in the mold directly pressed into shape.

Before stamping, the billet is placed on the lower die, the inner core and end die are loaded into the billet, and the upper die moves down to start pressing, and the elbow is formed by the constraint of the outer die and the support of the inner die.

Compared with the hot push process, the appearance of stamping forming quality is not as good as the former; stamping elbow in the forming of the outer arc in a tensile state, no other parts of the excess metal to compensate, so the wall thickness of the outer arc is about 10% thinner. But because of the characteristics of single-piece production and low cost, so the stamping elbow process is mostly used in small quantities, thick-walled elbow manufacturing.

Stamped elbow is divided into two kinds of cold stamping and hot stamping, usually according to the nature of the material and equipment capacity to choose cold stamping or hot stamping.

Cold extrusion elbow forming process is the use of special elbow forming machine, the billet into the outer die, the upper and lower die after the die, under the push rod, the billet along the inner and outer die reserved for the gap movement and complete the forming process.

The use of cold extrusion process inside and outside the die manufacturing elbow beautiful appearance, uniform wall thickness, small size deviation, so for stainless steel elbow, especially the thin-walled stainless steel elbow forming more than the use of this process manufacturing. This process requires high accuracy of the internal and external die; the wall thickness deviation of the billet is also relatively harsh requirements.

Plate welding system

Use the plate with a press to make half of the elbow profile, and then weld the two profiles together. Such a process is generally used to make DN700 or more elbow.

Other forming methods

In addition to the above three common forming processes, seamless elbow forming there is the use of extrusion of the billet to the outer die, and then through the billet ball shaping forming process. But this process is relatively complex, operation trouble, and forming quality is not as good as the aforementioned process, so less used

Typical use

It is a kind of pipe fitting commonly used in pipeline installation to connect two pipes of the same or different nominal diameters, so that the pipeline can make a certain angle turn, and the nominal pressure is 1-1.6Mpa.

Main products

Elbow by angle, there are 45 °, 90 °, 180 ° three most commonly used, in addition, according to engineering needs, also includes 60 ° and other non-normal angle; according to the production process, can be divided into welding elbow, stamping elbow, pushing elbow, casting elbow, etc.

Technical Requirements

1. As most of the pipe fittings are used for welding, in order to improve the quality of welding, the ends are turned into bevels, leaving a certain angle with a certain edge, this requirement is also relatively strict, how thick the edge, the angle for how much and the range of deviation are specified. The surface quality and mechanical properties are basically the same as those of the pipe. For the convenience of welding, the steel type of pipe fittings and the connected pipe is the same.

2. is that all pipe fittings are subjected to surface treatment, the inner and outer surface of the iron oxide by shot blasting treatment sprayed off, and then coated with anti-corrosion paint. This is for export needs, in addition, in the country is also to facilitate transportation to prevent rust and oxidation, are to do this work.

3. is the requirement for packaging for small pipe fittings, such as exports, you need to do wooden boxes, about 1 cubic meters, the number of elbows in such boxes can not exceed about a ton, the standard allows sets, that is, large sets of small, but the total weight generally can not exceed 1 ton. For large pieces of y to be a single package, like 24″ must be a single package. Another is the packaging mark, the mark is to indicate the size, steel number, batch number, manufacturer's trademark, etc.

Elbow parameter table

Nominal Diameter   Center to End Center to Center Back to Face
Outside Diameter 45° Elbow 90°Elbow 180° Elbow
At Bevel B A O K
DN NPS Series A Series B Long Radius Long Radius Short Radius Long Radius Short Radius Long Radius Short Radius
15 1/2 21.3 18 16 38 - 76 - 48 -
20 3/4 26.9 25 19 38 - 76 - 51 -
25 1 33.7 32 22 38 25 76 51 56 41
32 1.1/4 42.4 38 25 48 32 95 64 70 52
40 1.1/2 48.3 45 29 57 38 114 76 83 62
50 2 60.3 57 35 76 51 152 102 106 81
65 2.1/2 76.1(73) 76 44 95 64 190 127 132 100
80 3 88.9 89 51 114 76 229 152 159 121
90 3.1/2 101.6 - 57 133 89 267 178 184 140
100 4 114.3 108 64 152 102 305 203 210 159
125 5 139.7 133 79 190 127 381 254 262 197
150 6 168.3 159 95 229 152 457 305 313 237
200 8 219.1 219 127 305 203 610 406 414 313
250 10 273 273 159 381 254 762 508 518 391
300 12 323.9 325 190 457 305 914 610 619 467
350 14 355.6 377 222 533 356 1067 711 711 533
400 16 406.4 426 254 610 406 1219 813 813 610
450 18 357.2 478 286 686 457 1372 914 914 686
500 20 508 529 318 762 508 1524 1016 1016 762
550 22 559 - 343 838 559 1676 1118 1118 838
600 24 610 630 381 914 610 1829 1219 1219 914
650 26 660 - 406 991 660 1982 1320 - -
700 28 711 720 438 1067 711 2134 1422 - -
750 30 762 - 470 1143 762 2286 1524 - -
800 32 813 820 502 1219 813 2438 1626 - -
850 34 864 - 533 1295 864 2590 1728 - -
900 36 914 920 565 1372 914 2744 1828 - -
950 38 965 - 600 1448 965 2896 1930 - -
1000 40 1016 1020 632 1524 1016 3048 2032 - -
1050 42 1067 - 660 1600 1067 3200 2134 - -
1100 44 1118 1120 695 1676 1118 3352 2236 - -
1150 46 1168 - 727 1753 1168 3506 2336 - -
1200 48 1220 1220 759 1829 1219 3658 2440 - -

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