This standard specifies the symbols and codes, dimensions and tolerances, materials, manufacturing, inspection, testing, marking, protection and packaging requirements for seamless butt-welding pipe fittings of carbon steel, alloy steel and stainless steel with a diameter of DN 15 to DN 800
(NPS 1/2 to NPS 24). GB/T 12459-2005 Seamless butt-welding pipe fittings made of steel GB/T12459-2005 Standard download decompression password: www.bzxz.net This standard specifies the symbols and codes, dimensions and tolerances, materials, manufacturing, inspection, testing, marking, protection and packaging requirements for seamless butt-welding pipe fittings of carbon steel, alloy steel and stainless steel with a diameter of DN 15 to DN 800 (NPS 1/2 to NPS 24).

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ICS23.040.60
National Standard of the People's Republic of China
GB/T12459--2005
Replaces GB/T12459-1990
Steel butt-welding searnless pipe fittings(ASME B16.9.2001.FACTORY-MADE WROUGHTBUTTWELDINGFITTINGS,MOD)
2005-02-21 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2005-08-01 Implementation
Normative Reference Documents
Symbols and Codes
Dimensions and Tolerances
Material·
Manufacturing and Heat Treatment
Inspection·| |tt||Design verification test
Product test
Protection and packaging
Product quality certificate
Appendix A (Informative Appendix) British size table of steel butt-welding seamless pipe fittings Appendix (Informative Appendix)
Steel pipes connected with pipe fittings
Wall thickness classification table
GB/T12459--2005
This standard is a revised version of GB/T12459-19900 "Steel butt-welding seamless pipe fittings". GB/T12459-2005
This standard modifies and adopts ASMEB16.9:2001α "Forged steel butt-welding pipe fittings manufactured in factories", combined with domestic manufacturing conditions, and is reduced based on the original standard.
The main differences and similarities between this standard and ASMEB16.9:2001 are as follows: the type (seamless), size (DN800 and below) and technical requirements are basically the same as ASMEB16.9. The abbreviation format is different. 1. On the basis of the original standard, the dimensions of the welded ends of pipe fittings commonly used in my country to connect with "metric pipes", namely the "Ⅱ series" dimensions, are added; 2. The decimal places of the "outer diameter at the groove" of a particular specification are slightly different from those of ASMEB16.9, for example, the outer diameter at the groove of DV20 pipe fittings: ASME B16.9 is 26.7 mm, and this standard is deduced to be 26.9 mm. 3. The technical contents such as symbols and codes, materials, manufacturing and heat treatment, inspection, protection and packaging, and product quality certificates of pipe fittings are added.
Compared with GB/T12459
1990, the main changes of this standard are as follows:
-Added the symbol description of pipe fittings;
-According to ASMEB16.9, the size of flanged short section for flange connection is added: the size range is expanded from the original DN 15 ~~DN 500 to DN 15 ~DN 800. Among them, the size of long radius elbow, tee, cross, pipe cap and reducer is expanded from DN 15 ~ DN 500 to DN 15 ~ DN 800, and the size of other pipe fittings is expanded from DN 15-DN 500 to DNV 15 ~ DN 600. The material and manufacturing process requirements are added, the design verification requirements are supplemented, and the technical contents such as wide inspection are modified. The appendix A and appendix B of this standard are both informative appendices. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Pipeline Accessories. Drafting units of this standard: Mechanical Science Research Institute, Wuxi Xinfeng Pipe Industry Co., Ltd., Cangzhou Bohai Pipe Fittings Co., Ltd., Jiangyin Nanfang Pipe Fittings Manufacturing Co., Ltd., Shanghai Gaoqiao Pipe Fittings Co., Ltd., Tianjin Jinding Pipeline Co., Ltd., Jiangyin Jintong Petrochemical Pipe Fittings Co., Ltd., Jiangyin Hailu High-Pressure Pipe Fittings Co., Ltd., Bengbu Road Fittings Factory, Baotou Xingyuan Seamless Welfare Pipe Fittings Factory, Luoyin Petrochemical Engineering Company, Central South Electric Power Design Institute, Northeast Electric Power Design Institute
Drafting persons of this standard: Li Junying, Xie Shunxian, Zhu Quanming, Liu Shangci, You Peizhong, Xin He, Yao Mingwen, Zhu Xiaofeng, Wang Qingyao, Wang Hanqing, Li Susang, Wen Qiding, Huang Tao, Wang Junsheng, Huang Guohong. 1 Scope
Steel butt-welded seamless pipe fittings
GB/T 12459--2005
This standard specifies the symbols and codes, dimensions and tolerances, materials, manufacturing, inspection, testing, marking, protection and packaging requirements of carbon steel, alloy steel and stainless steel butt-welded seamless fittings with a size of DN15 to DN800 (NPS1/2 to NPS21). 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errors) or revisions are not applicable to this standard. However, the parties to the standard who have reached an agreement are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version generally applies to this standard. GB 150 Steel pressure vessels
GB/T710 High-quality carbon turbulent structural steel hot-rolled thin steel plates and steel stripsGB/T711 High-quality magnetic structural steel hot-rolled thick steel plates and wide steel stripsGB713 Hook plates for boilers
GB/T912 Carbon cable structural steel and low alloy structural steel hot-rolled thin steel plates and steel stripsGB/T1047 Definition and selection of pipeline components D>N (nominal size) (S06708: 1995, MOD)GR3087 Low and medium pressure vehicle furnaces with smooth seams
GB/T3274 Carbon case structural steel and low alloy structural steel hot wheel thick steel plates and steelGB/T3280 Stainless steel cold-rolled steel plates
GB3531 Low temperature pressure wearer with alloy steel platesGB/T4237 Stainless steel hot-rolled steel plates
GH/T4238 Heat-resistant steel plates
CB5310Seamless steel pipe for commercial pressure boilers
GR6479
Seamless steel pipe for high pressure fertilizer equipment
GB6654
Pressure vessel steel plate
GB/7:8163 Seamless steel pipe for conveying fluid (negJSO559:199J) GB/T9118.1-2000 Raised face welded ring neck loose sleeve steel pipe flange GB/T9118.2-2000 Ring connection face welded ring neck loose sleeve steel pipe flange GB/9124:2000 Technical conditions for steel pipe flanges GB/T9948 Seamless steel pipe for petroleum cracking
GB/T14976 Seamless stainless steel pipe for fluid conveying (ASTMA269:2000NEQ) JB4730 Nondestructive testing of pressure vessels
ASME B16.5 Pipe method and method "pipe fittings
ASMFH16.9:2001D. Factory-made forged steel butt-welded pipe fittings A5MEB36.10M:1996 Welded and seamless forged steel pipe ASMFB36.19M:1985R1994) Stainless steel pipe 3 Symbols and codes
3.1 Symbol
1N Nominal size of one metric unit fittings: non-measured value (see GI3/T1047): 1
GB/T 12459—2005
Nominal dimensions of pipe fittings in imperial units, non-measured values; -90° elbow, distance from one end face center to the other end face; 180° elbow, distance from the center to the end face center: A
-45° elbow, distance from the center to the end face;
Distance from the branch outlet axis of the tee and cross to the end face of the center body: elbow, equal-diameter tee and cross, outer diameter of the groove of the pipe cap, outer diameter of the groove of the large end of the reducing pipe fitting: outer diameter of the groove of the small end of the reducing pipe fitting:
Counting cap (pipe seal Total height of the flanged nipple:
Length of the flanged nipple;
Outer diameter of the flanged nipple:
Distance from the face of the reducer to the end face;
Distance from the end face to the top of the 180° elbow;
Distance from the center line of the tee and cross body to the end face of the branch pipe: Distance from the center of one end face to the center of the other end face of the 180° elbow: Corner radius;
Specified wall thickness of the large end welding end of the same or different diameter pipe fittings: Specified wall thickness of the small end welding end of the different diameter pipe fittings: Flange thickness of the flanged nipple.
2 Code
For the types and codes of the light-slit arm fittings, see Table 1. Table 1
Types and codes of pipe fittings
45° elbow
90' elbow
180° reducer
shore-diameter joint
(reducer and reducer)
flanged short joint
4 Dimensions and tolerances
4. 1 Standard dimensions
Long radius
Long radius
Short radius
Long radius reducing
Short radius
45 E1)
901(5)
90E(L)R
180E(L)
180E(S)
4.1.1. The size of the fittings shall comply with the provisions of Figures 1 to 10 and Tables 3 to 12: The outer diameter of the end of the fitting is in two series, I and II, and the "series is the international general series. The wall thickness classification table of seamless steel pipes connected to the T series fittings is listed in Appendix B. 4.1.2 In order to facilitate international trade, the imperial size table of T series fittings is listed in Appendix A. CB/T12459—2005
4.1.3 Since the metric unit and the imperial unit cannot be exactly equivalent, the user must use the two unit systems respectively. For fittings with metric units, the nominal size is expressed by DN; for fittings with imperial units, the nominal size is expressed by NPS; the relationship between the two is shown in Table 2.
Table 2DN and NPS Comparison table
Note: NPS greater than 4, DN-25×(NPS). 4.2 Special size
4.2.1 For applications involving fatigue loads, the purchaser shall provide the required minimum size. 80
4.2.2 The conditions of use and the connection structure usually determine the length requirements for the flanged nipple. Therefore, when ordering, the purchaser must specify whether it is a long or short flanged nipple (see Table 10 Note 2). 4.3 Tolerance
The dimensional deviation and geometric tolerance of pipe fittings shall comply with the provisions of Table 13 and Figure 11. Figure 1 Long radius elbow
Table 3 Long radius elbow size
Outer distance at groove
Nominal size
1 series
Ⅱ series
90° elbow
Center to wax surface
Unit: meter
45° elbow
GB/T 12459—2005
Nominal size
Nominal size small
50×40
50×25
65×50
65×32
80×65
80×50
80×40
90×65
90×50
「Series
Table 3 (continued)
External lightness at the section mouth
Ⅱ Series
Figure 2 Long radius reducing elbow
Table 4 Long radius reducing elbow size
External diameter at the groove
「Series
Ⅱ Series
「Series
90° variable head
Center to end face
Ⅱ Series
Unit is linear meter
45° commercial head
Unit is millimeter
Center to end face
General size
100x90
100x80
100×65
100×50
125×100
125×90
125XB0
125×65
150×125
150×100
150X9 0
150×80
200×150
200×125
200×100
250X200
250×150
250×125
300×250
300X200||tt ||300×150
350×300
350×250
350×200
400X350
400X250
450×400
450×350
15 0×300
450×250
500X450
500×400
500X350
500×300
500×250
600×550
600×500
600×450
500×400
600X350
600X300
1 Series
Big End D
Table 4 (Continued)
Outer Diameter at Groove
1 Series
Ⅱ Series
GB/T 12459—2005
Unit: mm
Center to surface
GB/T 12459—2005
For the tolerance of end misalignment, see Table 13.
The ruler is equal to half the ruler.
Nominal size
Figure 3 Long radius 180° elbow
5 Long radius 180° elbow size
Outer diameter at groove
「Series
Center to center
1V20 condition, determined by the manufacturer) The value of K can be 57mm and 4.3mm respectively. 6
Single should be side meter
Back to end face
1 Series
11 Series
Nominal size
Figure 4 Short radius elbow
Table 6 Short radius elbow size
Outer diameter at groove
1 Series
【Series
GB/T 12459—2005
Unit: mm
Center to end face
GB/T 12459—2005
βDimension A is equal to -half of size O
Nominal size
Figure 5 Short radius 180° elbow
Table 7 Short radius 180° elbow dimensions
Outer diameter at groove
I series
Positive series
Center to center
Unit: mm
Back chamber end
「series
Ⅱ series
Nominal size
I series
Figure 6 Equal diameter tees and crosses
Table 8 Equal diameter tees and crosses dimensions
Outer diameter at groove
Outlet series
10N650 and above tees and crosses are recommended but not required to use the maximum size M. Size is suitable for N 600 and below four-way pipe
GB/T12459-2005
Unit is string meter
Center congee surface
Export·3 Tolerances
The dimensional deviation and geometric tolerances of pipe fittings shall comply with the provisions of Table 13 and Figure 11. Figure 1 Long radius elbow
Table 3 Long radius elbow dimensions
Outer range at groove
Nominal dimensions
1 series
II series
90° elbow
Center to wax surface
Unit: meter
45° elbow
GB/T 12459—2005
Nominal size
Nominal size small
50×40
50×25
65×50
65×32
80×65
80×50
80×40
90×65
90×50
「Series
Table 3 (continued)
External lightness at the section mouth
Ⅱ Series
Figure 2 Long radius reducing elbow
Table 4 Long radius reducing elbow size
External diameter at the groove
「Series
Ⅱ Series
「Series
90° variable head
Center to end face
Ⅱ Series
Unit is linear meter
45° commercial head
Unit is millimeter
Center to end face
General size
100x90
100x80
100×65
100×50
125×100
125×90
125XB0
125×65
150×125
150×100
150X9 0
150×80
200×150
200×125
200×100
250X200
250×150
250×125
300×250
300X200||tt ||300×150
350×300
350×250
350×200
400X350
400X250
450×400
450×350
15 0×300
450×250
500X450
500×400
500X350
500×300
500×250
600×550
600×500
600×450
500×400
600X350
600X300
1 Series
Big End D
Table 4 (Continued)
Outer Diameter at Groove
1 Series
Ⅱ Series
GB/T 12459—2005
Unit: mm
Center to surface
GB/T 12459—2005
For the tolerance of end misalignment, see Table 13.
The ruler is equal to half the ruler.
Nominal size
Figure 3 Long radius 180° elbow
5 Long radius 180° elbow size
Outer diameter at groove
「Series
Center to center
1V20 condition, determined by the manufacturer) The value of K can be 57mm and 4.3mm respectively. 6
Single should be side meter
Back to end face
1 Series
11 Series
Nominal size
Figure 4 Short radius elbow
Table 6 Short radius elbow size
Outer diameter at groove
1 Series
【Series
GB/T 12459—2005
Unit: mmbzxz.net
Center to end face
GB/T 12459—2005
βDimension A is equal to -half of size O
Nominal size
Figure 5 Short radius 180° elbow
Table 7 Short radius 180° elbow dimensions
Outer diameter at groove
I series
Positive series
Center to center
Unit: mm
Back chamber end
「series
Ⅱ series
Nominal size
I series
Figure 6 Equal diameter tees and crosses
Table 8 Equal diameter tees and crosses dimensions
Outer diameter at groove
Outlet series
10N650 and above tees and crosses are recommended but not required to use the maximum size M. Size is suitable for N 600 and below four-way pipe
GB/T12459-2005
Unit is string meter
Center congee surface
Export·3 Tolerances
The dimensional deviation and geometric tolerances of pipe fittings shall comply with the provisions of Table 13 and Figure 11. Figure 1 Long radius elbow
Table 3 Long radius elbow dimensions
Outer range at groove
Nominal dimensions
1 series
II series
90° elbow
Center to wax surface
Unit: meter
45° elbow
GB/T 12459—2005
Nominal size
Nominal size small
50×40
50×25
65×50
65×32
80×65
80×50
80×40
90×65
90×50
「Series
Table 3 (continued)
External lightness at the section mouth
Ⅱ Series
Figure 2 Long radius reducing elbow
Table 4 Long radius reducing elbow size
External diameter at the groove
「Series
Ⅱ Series
「Series
90° variable head
Center to end face
Ⅱ Series
Unit is linear meter
45° commercial head
Unit is millimeter
Center to end face
General size
100x90
100x80
100×65
100×50
125×100
125×90
125XB0
125×65
150×125
150×100
150X9 0
150×80
200×150
200×125
200×100
250X200
250×150
250×125
300×250
300X200||tt ||300×150
350×300
350×250
350×200
400X350
400X250
450×400
450×350
15 0×300
450×250
500X450
500×400
500X350
500×300
500×250
600×550
600×500
600×450
500×400
600X350
600X300
1 Series
Big End D
Table 4 (Continued)
Outer Diameter at Groove
1 Series
Ⅱ Series
GB/T 12459—2005
Unit: mm
Center to surface
GB/T 12459—2005
For the tolerance of end misalignment, see Table 13.
The ruler is equal to half the ruler.
Nominal size
Figure 3 Long radius 180° elbow
5 Long radius 180° elbow size
Outer diameter at groove
「Series
Center to center
1V20 condition, determined by the manufacturer) The value of K can be 57mm and 4.3mm respectively. 6
Single should be side meter
Back to end face
1 Series
11 Series
Nominal size
Figure 4 Short radius elbow
Table 6 Short radius elbow size
Outer diameter at groove
1 Series
【Series
GB/T 12459—2005
Unit: mm
Center to end face
GB/T 12459—2005
βDimension A is equal to -half of size O
Nominal size
Figure 5 Short radius 180° elbow
Table 7 Short radius 180° elbow dimensions
Outer diameter at groove
I series
Positive series
Center to center
Unit: mm
Back chamber end
「series
Ⅱ series
Nominal size
I series
Figure 6 Equal diameter tees and crosses
Table 8 Equal diameter tees and crosses dimensions
Outer diameter at groove
Outlet series
10N650 and above tees and crosses are recommended but not required to use the maximum size M. Size is suitable for N 600 and below four-way pipe
GB/T12459-2005
Unit is string meter
Center congee surface
Export·3mm. 6
Single should be mm
Back to end face
1 series
11 series
Nominal size
Figure 4 Short radius elbow
Table 6 Short radius elbow size
Outer diameter at groove
1 series
【Series
GB/T 12459—2005
Unit is mm
Center to end face
GB/T 12459—2005
βDimension A is equal to -half of size O
Nominal size
Figure 5 Short radius 180° elbow
Table 7 Short radius 180° elbow dimensions
Outer diameter at groove
I series
Positive series
Center to center
Unit: mm
Back chamber end
「series
Ⅱ series
Nominal size
I series
Figure 6 Equal diameter tees and crosses
Table 8 Equal diameter tees and crosses dimensions
Outer diameter at groove
Outlet series
10N650 and above tees and crosses are recommended but not required to use the maximum size M. Size is suitable for N 600 and below four-way pipe
GB/T12459-2005
Unit is string meter
Center congee surface
Export·3mm. 6
Single should be mm
Back to end face
1 series
11 series
Nominal size
Figure 4 Short radius elbow
Table 6 Short radius elbow size
Outer diameter at groove
1 series
【Series
GB/T 12459—2005
Unit is mm
Center to end face
GB/T 12459—2005
βDimension A is equal to -half of size O
Nominal size
Figure 5 Short radius 180° elbow
Table 7 Short radius 180° elbow dimensions
Outer diameter at groove
I series
Positive series
Center to center
Unit: mm
Back chamber end
「series
Ⅱ series
Nominal size
I series
Figure 6 Equal diameter tees and crosses
Table 8 Equal diameter tees and crosses dimensions
Outer diameter at groove
Outlet series
10N650 and above tees and crosses are recommended but not required to use the maximum size M. Size is suitable for N 600 and below four-way pipe
GB/T12459-2005
Unit is string meter
Center congee surface
Export·
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