English (Welded butt welding elbow here) are steel hot-pressing molding or bend forging forming, its connection form is directly to the elbow and the steel pipe butt welding, butt welding elbow's main manufacturing standards are generally GB/T13401-2005, GB/T12459-2005, ASME B16.9, SH3409, HG/T21635, HG/T21631, SY/T0510, GB/T10752-1995.
The alloy elbow made of manganese steel is usually used in concrete conveying pipeline and mud conveying pipeline because of its excellent performance of bearing impact, extrusion and material wear.And the high manganese steel alloy elbow is used in the fluid flow is more intense, strong impact pipeline;Nickel-steel alloy elbow is usually used in high-concentration oxidized acid (nitric acid, sulfuric acid) in the room temperature pipeline, but in reductive acid (hydrochloric acid, dilute sulfuric acid, etc.) in the pipeline will be severely corrosive, unless the concentration of hydrochloric acid is very low;Martensitic alloy bend under 650 ℃ high temperature strength, oxidation resistance and water vapor corrosion resistant ability, but poor weldability.Therefore, is often used in the high temperature steam pipeline, water gas pipeline.Executive standards :GB/ t12459-2005, GB/T13401, GB/ t10752-1999
The butt welding elbow classification
(1) the butt welding elbow press its radius of curvature to points, can be divided into the butt welding elbow butt welding elbow long radius and short radius.Long radius butt weld bend radius of curvature is equal to 1.5 times the pipe diameter, R = 1.5 D.Short radius butt weld bend radius of curvature is equal to the pipe diameter, R = 1 d.Type D for butt welding of bend diameter, R is the radius of curvature.If no specific instructions, general selection is 1.5 D bend.
If (2) according to the grades of pressure points, about seventeen, and American standard pipe is the same, there are: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS;Sch80, Sch100, Sch120, Sch140, Sch160, XXS, one of the most common is two kinds of STD and XS.
(3) according to bend Angle points, butt welding elbow has 45 degrees, 90 degrees 90 degrees of butt welding elbow and butt welding elbow bend and other different angles.
(4) material: carbon steel, alloy steel and stainless steel.
The material of the butt welding elbow
Carbon steel, ASTM/ASME A234 WPB, WPC
Alloy: ASTM/ASME A234 WP 11-12-1 - WP WP WP 22 - WP 5 - WP 91-35 crmov WP911, 15 mo3 15 crmov,
Stainless steel, ASTM/ASME A403 WP 304-304 - l - 304 - h - 304 ln - 304 n
ASTM/ASME A403 WP 316-316 l - 316 - h - 316 ln - 316 - n - 316 ti
ASTM/ASME A403 WP 321-321 - h ASTM/ASME A403 WP 347-347 - h
Low temperature steel, ASTM/ASME A402 WPL3 - WPL 6
High performance steel: ASTM/ASME A860 WPHY 42-46-52-60-65-65
standard
The Japanese standards
Standard no.
JIS B2311 general steel butt welding pipe fittings
JIS B2312 steel butt welding pipe fittings
JIS B2313 steel butt welding pipe fittings
JIS B2316 steel socket welding pipe fittings
Pipe standards of American standard:
Standard no.
ANSI/ASME B16.9 factory forged steel butt welding pipe fittings
ANSI/ASME B16.11 forged socket welding and threaded pipe fittings
ASME/ANSI B16.28 steel butt welding of small radius bend and bend back
ASME B16.5 pipe flanges and flanged fittings
MSS SP - 43 forged stainless steel butt welding pipe fittings
MSS - SP - 79 socket adapter insert
MSS - SP - 83 socket welding and threaded union
MSS - SP - 97 socket welding, threaded and welded the overall strengthening type header
Electric power standard
Standard no.
GB2000 thermal power plant steaming-water pipe parts and components of typical design manual
DL/T515-93 power plant pipe bending
D - GD87 typical design - 1101 pipe parts and components
Pipe standards of chemical standard:
Standard no.
HGJ514 carbon steel, low alloy steel seamless butt welding pipe fittings
HGJ528 steel slit butt welding pipe fittings
HGJ10 forging steel socket welding pipe fittings
HGJ529 socket welding, threaded and forging steel butt over Taiwan
HGJ - 44-76-91 steel pipe flanges, gaskets, fasteners
HG20592-20635 steel pipe flanges, gaskets, fasteners
Sinopec standard
Standard no.
Petrochemical steel pipe flange SH3406-1996
SH3408-1996 steel seamless pipe butt welding
SH3409-1996 forged steel socket welding pipe fittings
SH3410-1996 forged steel socket welding pipe fittings
Petrochemical tubular furnace SH3065-1994 technical standards of the elbow
The national standard
Standard no.
GB12459-2005 steel seamless pipe butt welding
GB/T13401 steel butt welding pipe fittings
GB/T14383 forging steel socket welding pipe fittings
GB/T10752-1995 Marine steel pipe butt joint
GB/T17185-1995 steel flange pipe fittings
Pipe standards of oil standard:
Standard no.
SY/T0510-1998 steel butt welding pipe fittings
SY/T5257-2004 steel pipe bending
02 s403 steel pipe construction standards of the state
