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The method of making a seamless 45-degree elbows can be divided into push the system, pressing, forging, casting and so on. According to its radius of curvature of points: it can be divided into long radius elbows and short radius elbow.
Seamless elbow 45 degrees
| Nominal Diameter | Outside Diameter | Center to End | Center to Center | Back to Face | ||||||
| 45°Elbow | 90°Elbow | 180°Elbow | ||||||||
| B | A | O | K | |||||||
| DN | NPS | Series A | Series B | Long | Long | Short | Long | Short | Long | Short |
| 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 | 273.0 | 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 | 457.2 | 478 | 286 | 686 | 457 | 1372 | 914 | 914 | 686 |
| 500 | 20 | 508.0 | 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 | - | - |
High-quality products
Two 45-degree elbows can not be welded into a 90-degree bend to use, because the stress concentration area is the elbow pipe, expansion and most of the stress deformation during cooling are released at the elbow. Also weld itself to be the weak link, fatigue deformation will soon cause cracking damage, which planted a lot of hidden dangers, so do not at immediate convenience, eventually leading to huge losses.
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