Steel Pipe Elbow
In a pipeline system, elbow is a kind of bent piping allowing straight pipes to be joined at an angle to change the direction. Divided according to the radius, butt weld elbows are available in long-radius type and short-radius type: the radius of curvature of long-radius elbow is 1.5 times of the pipe’s outer diameter (R=1.5D); while for short-radius elbow, the values of the 2 items are equal (R=1.0D). Fittings whose radius of curvature is less than or equal to 1.5 times of pipe diameter are recognized as elbows, or they will be defined as bent pipes. An elbow can be 45, 90, or 180 degree, the 3 types of which are used most frequently. Other angles like 15, 30, and 60 degree are also available for different construction requirements.
According to the pipe materials and wall thickness, pipe elbows are manufactured with different molding techniques. Commonly used techniques for seamless elbow are hot forming, stamping, and extrusion. For welded elbows, we will firstly manufacture 2 pieces of the elbow body separately, and then weld the 2 sections together. This butt welding method is suitable for fabricating elbows with size over DN300.
- 90 degree seamless butt weld elbow (R=1D)
- 90 degree seamless butt weld elbow (R=1.5D)
- 45 degree seamless butt weld elbow (R=1.5D)
- 180 degree seamless butt weld pipe (R=3D)
- 180 degree seamless butt weld elbow (R=1.5D)
Butt weld elbow is generally fabricated from steel pipes with butt welding technique, which is a highly efficient and automatic process of jointing two pieces of metal together along a single edge in a single plane. Parameter ranges of different elbows are shown in the table:
| Type | Nominal diameter | Radius of curvature (R) | Thickness | Angle | |
| Seamless elbow | 1/4"~24" | DN8-DN600 | R=1D R=1.5D | 1.5~26mm | 15°~180° |
| Welded elbow | 1/2"~24" | DN15-DN600 | R=1D R=1.5D | 1.5~26mm | |
| Seamless bent pipe | 1/2"~24" | DN15-DN600 | R=2D~20D | 1.5~26mm | |
- 90 degree die stamped elbow
- 90 degree die stamped elbow
-
Die stamped elbows are manufactured with cold or hot stamping die welding technique, so there are generally one or two longitudinal seams on the elbow body. The production range is listed in the table:
| Type | Nominal diameter | Radius of curvature (R) | Thickness | Angle | |
| Die stamped elbow | 10"~84" | DN250-DN2100 | 1.5~30mm | 1.5~26mm | 15°~180° |
| Austenitic stainless steel | Super duplex stainless steel | Nickel-based alloy steel | Carbon steel/alloy steel | Other materials |
| 304 304L 304H 304LN | S31803 S32205 | N10276 N04400 N06600 | Q235 20# 20G | TA1 TA2 TA3 TC1~TC9 |
| 316 316L 316H 316Ti | S32304 S32760 | N06600 N06625 N06690 | WPB A105 16Mn | LF2 LF3 LF5 LF6 LF10 |
| 310S 321 321H 347 | S32550 S32750 | N08800 N08825 N08904 | 45# 15CrMo | Al, Ti, martensite |
| S31254 | S33400 | N08020 N08810 N08811 | A350LF2 A420Gr.WPL6 |
To ensure the quality of our pipe fittings, all of the raw materials like the steel pipes for butt weld elbows, the steel sheets for die stamped elbows, and the steel bars for forged elbows are introduced from reliable suppliers. Quality inspection is conducted in the whole production process. Before shipping, we will have a 100% spectral detection for all of the fittings, ensuring the highest degree of quality.
In our inspection center, we have over 100 sets of inspection equipment, including desktop optical emission spectrometer from SPECTRO, chemical analysis and testing center, fully automatic carbon/sulfur analyzer, high-speed analyzer, X-ray testing chamber, ultrasonic flaw detector, magnetic particle detector, infiltration detector, ultrasonic thickness gauge, computer-controlled electronic universal testing machine, 60-ton hydraulic universal tensile testing machine, low-temperature impact testing machine, metallographic analyzer, and infrared thermometer, etc.
| Seamless steel butt weld pipe fittings: | SH3408 |
| Seamless steel fittings: | GB/T12459 |
| Butt weld elbows for marine use: | GB/T10752-1995 |
| Titanium/titanium alloy seamless and welded fittings: | GB/T27684 |
| Steel butt weld fittings for piping: | JIS B2312 |
| Factory made butt weld fittings: | ASME B16.9 |
| Socket weld fittings made from forged steel: | GB/T14383 |
| Socket weld fittings made from forged steel: | SH3410 |
| Socket weld fittings and threaded fittings: | ASME B16.11 |
| Austenitic stainless steel pipe fittings: | ASTM A403/A403M |
| Butt weld fittings: | DIN EN 10253-3 (forged Austenitic stainless steel and duplex Austenitic stainless steel with no special inspection requirements) |
| Butt weld fittings: | DIN EN 10253-4 (forged Austenitic stainless steel and duplex Austenitic stainless steel with special inspection requirements) |
Our company can provide pipe elbows according to custom need materials like austenitic stainless steel, duplex stainless steel, carbon steel and alloy steel listed as follows:
304 stainless steel pipe elbow
304L stainless steel pipe elbow
304H stainless steel pipe elbow
304LN austenitic stainless steel pipe elbow
316 stainless steel pipe elbow
316L stainless steel pipe elbow
316H stainless steel pipe elbow
316Ti stainless steel pipe elbow
310S stainless steel pipe elbow
321 stainless steel pipe elbow
321H stainless steel pipe elbow
347 stainless steel pipe elbow
S31254 austenitic stainless steel pipe elbow
S31803 duplex stainless steel pipe elbow
S32205 duplex stainless steel pipe elbow
S32304 duplex stainless steel pipe elbow
S32760 duplex stainless steel pipe elbow
S32550 duplex stainless steel pipe elbow
S32750 duplex stainless steel pipe elbow
S33400 stainless steel pipe elbow
N10276 Nickel alloy pipe elbow
N04400 Nickel alloy pipe elbow
N06600 Nickel alloy pipe elbow
N06625 Nickel alloy pipe elbow
N06690 Nickel alloy pipe elbow
N08800 Nickel alloy pipe elbow
N08825 Nickel alloy pipe elbow
N08904 Nickel alloy pipe elbow
N08020 Nickel alloy pipe elbow
N08810 Nickel alloy pipe elbow
N08811 Nickel alloy pipe elbow
Q235 carbon steel pipe elbow
20# carbon steel pipe elbow
20G carbon steel pipe elbow
WPB carbon steel pipe elbow
A105 carbon steel pipe elbow
16Mn steel pipe elbow
45# carbon steel pipe elbow
15CrMo alloy steel pipe elbow
A350 LF2 carbon steel pipe elbow
A420 grade WPL6 carbon steel pipe elbow
TA1 titanium pipe elbow
TA2 titanium pipe elbow
TA3 titanium pipe elbow
TC1—TC9 titanium alloy pipe elbow
LF2 alloy steel pipe elbow
LF3 alloy steel pipe elbow
LF5 alloy steel pipe elbow
LF6 alloy steel pipe elbow
LF10 alloy steel pipe elbow
Martensite stainless steel pipe elbow
