JB/T 6296.7-1992 Steam turbine pipe accessories screw plug JB/T6296.7-1992 standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Steam Turbine Pipe Accessories
Subject Content and Scope of Application
This standard specifies the size series and basic requirements for screw plugs for steam turbines. This standard applies to the design, manufacture and acceptance of screw plugs for steam turbines. 2 Reference Standards
GB1220
GB3077
Basic dimensions of thread finish, shoulder distance, undercut, chamfer for ordinary threads
Ordinary threads
Tolerances and fits
Stainless steel bars
Technical conditions for alloy structural steel
GB3103.1Tolerances for fasteners Bolts, screws and nuts JB2901
Technical conditions for anti-rusting of steam turbines
Structural types and sizes Inch series
The structural type and dimensions of the hexagonal screw plug are shown in Figure 1 and Table 1. 3.1
Printing part
Hexagonal head length
——Plug depth
W—Chamfer radius
Flange length
d—Aperture
-Hexagonal width across flats
Mark: Name Thread specification standard number
Example: Screw plug M10×1JB/T6296.7-92 Ministry of Machinery and Electronics Industry Approved 199206-26
Shoulder distance of undercut
Major thread diameter
Hexagonal diagonal dimension
Chamfer dimension
Outer diameter of flange
JB/T6296.7-92
Thread length
Diameter of undercut
Implemented 1993-01-01
M12×1.26
M27×2
M30×2||tt ||M33×2
M39×2
M42×2
M45×2
M48×2
M52×2
M56×2
M56×4
M64×2
M76×2
M76×4
JB/T6296.7-92
3.2 For the structural type and size of the venting vortex, see Figure 2 and Table 2. min
per 100 pieces
flange thickness
-vent hole diameter
marking:namethread specification
JB/T6296.7-92
figure, 2
retract diameter
flange diameter
plug length
thread major diameter
-plug depth
-vent hole center to plug end face size
standard number
example: vent plug M14×1.5JB/T6296.7-92 table
the structural type and size of hexagonal spiral pipe are shown in figure 3a,
figure 3b and table 3
inner hole diameter
inner hole Depth
Weight per 100 pieces
Hexagon depth
Major diameter of pipe thread
Length of pipe plug
JB/T6296.7-92
Mark: Name Taper thread Size code Standard number Retracting phase diameter
Example: Hexagonal spiral pipe plug MPT1/8JB/T6296.7-92 Table 3
Taper thread
Size code
NPT1/8
NPT1/4
NPT3/8
NPT1/2
NPT3/4
NPT11/4
NPT11/2||t t||3.4 ​​The structural type and size of square head spiral pipe plugs are shown in the figure. Printing part
Major diameter of tapered pipe thread
Length of square head
Flaring diameter
Width across flats
Spiral length
Diagonal size
Weight per 100 pieces
Orifice—Square head side length
Marking: Name Thread size code Standard number JB/T6296.7-92
Example: Square head spiral pipe plug NPT1/8 JB/T6296.7-92 Table 4
Tube thread size
NPT1/8
NPT1/4
NPT3/8
NPT1/2||tt| |NPT3/4
NPT11/4
NPT11/2
NPT21/2
NPT31/2
For the structural type and dimensions of square head screw plug (ZG), see Figure 5 and Table 5. 3.5
Printing position
1.5×45°
Major diameter of taper pipe thread
H Square head length
Marking: Name Taper pipe thread size code Standard number Example: Square head screw plug ZG1/8JB/T6296.7-92H
Spiral length
Weight per 100 pieces
200:17
Side length of a square head
Taper pipe thread size
ZG 1/4
ZG 1/2
ZG 11/4
ZG11/2
ZG 21/2
ZG 31/2
4Technical requirements
JB/T6296.7-92
Material selection and heat treatment requirements shall be as per Table 6 and shall comply with relevant standards. Table 6
Parts Name
Hexagonal screw plug
Vent plug
Hexagon socket
Screw pipe plug
Screw pipe plug
Square head screw plug
Carbon steel
Alloy structural steel
Alloy structural steel
Carbon steel
Carbon steel
Stainless steel
Carbon steel
Stainless steel
15CrMoA20CrMoA
35CrMoA
20Cr1Mo1VNbTiB||tt ||25Cr2Mo1VA
OCr19Ni900Cr19Ni11
00Cr19Ni11
GB3077
GB3077wwW.bzxz.Net
GB1220
GB1220
Weight per 100 pieces
311.30:
Solid solution + aging
Solid solution + aging
4.2 The basic dimensions of the threads of hexagonal screw plugs and venting swivel plugs shall comply with GB196; the thread tolerance shall be manufactured according to the 6g6H grade specified in GB197. 4.3 The verticality between the bearing surface of the screw plug and the swivel plug and the thread center shall comply with GB3103.1. 4.4 The tolerance of the width across flats of the inner and outer hexagonal plugs shall comply with GB3103.1. 4.5 The unmarked thread undercut, tail and chamfer shall comply with the provisions of GB3. 4.6 Thread surface roughness: external thread is 634.7 for internal thread, and the carbon steel surface shall be oxidized. 49
5.1 Products shall be inspected 100%.
JB/T6296.7-92
Except for the first two threads and the screw tail, no incomplete threads are allowed. 5.2
The thread surface shall be smooth and flat, and no cracks, folds, dents and cracks are allowed. 5.3
The product surface shall be smooth and flat, and no cracks, dents, burrs, rounded edges and flash are allowed: the shape and position tolerances of the product shall comply with the drawings and standard requirements. Rust prevention, packaging, marking, storage
The product shall be coated with anti-rust oil according to JB2901.
The packaging boxes and other items should have signs or labels on the outside with the following contents: Manufacturer name;
Product name;
Product mark;
·Product quantity or net weight:
Manufacturing date or production batch number,
6.3 The form and method of product packaging can be determined by the manufacturer, but under normal storage and transportation conditions, the product should be protected from damage or loss. 6.4
The product should be stored in a dry place,
Additional instructions:
Under normal circumstances, the anti-rust period of the product is 12 months. This standard was proposed and coordinated by the Shanghai Power Generation Equipment Complete Design Institute. This standard was drafted by Shanghai Steam Turbine Plant and Shanghai Power Generation Equipment Complete Design Institute. The main drafters of this standard are Fu Shengqing, Ren Qihua, Fang Chonghua, 50
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