JB/T 1308.9-1999 PN250a Joint nut types, dimensions and technical requirements

JB/T 1308.9-1999 JB/T 1308.9-1999 PN250a Joint nut type, size and technical conditions JB/T1308.9-1999 Standard download decompression password: www.bzxz.net

1C.S 23.060
Machinery Industry Standard of the People's Republic of China
JB/T1308.1-1308,21-1999
PN250MPa ultrahigh pressure valves and fittings
Technical conditions
Speclfcations for PN 2S0 MPa ultrahighpressure valves and fittings1999-07-12Released
State Machinery Industry Bureau
2000-01-01Implementation
! : Fan Gu
Machinery Industry Standard of the People's Republic of China
PN 250 MPa Joint Nuts
Type, Dimensions and Technical Conditions
Type, Dimensions and Technical Conditions of PN250MPujoinlsuuts
This standard specifies the type, size and technical requirements of super-high non-bundled joint nuts IB/T1308.9-1999
HEN1316-73
This standard is applicable to the joint nuts with a nominal force of 250MPa and 7, ethylene and other neutral media. ! Reference Standards
The texts contained in the following standards shall constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Applicants using this standard should consider the possibility of using the latest of the following standards: GB/TJ961981
GB/T197—1981
GRT1M-12
GiR/T 1077—1989
JB.T1308.2
3: Structural type and size
Size of screw thread (true diameter 1~600 mm) General tolerance and fit (diameter [-355mm] General tolerance Note tolerance of linear size
Technical conditions for alloy structural steel
PV230MT Technical conditions for fittings, pipe fittings and fasteners The type of joint nut shall be in accordance with the provisions of the drawing
Real meeting V
Approved by the Beijing Machinery Industry Bureau on July 12, 1999 and implemented on January 1, 2002
3.2 The size of the joint nut shall be selected according to the provisions of Table 1
Joint effect code
M2( ×15 AHi
M24 × 2-6H
33 ×2-6r
M48 × 2. 6l
+Technical requirements
[B/T1308.9—1999wwW.bzxz.Net
Joint nut material 3SCrMoA, technical requirements according to GB/T3077. 4.1
4.2 Mechanical properties after heat treatment according to Table 2, bag 2
Material brand
IS:MoA
Long-term strength?
Elongation 8
Reduction in shrinkage
Impact energy 4,
4.3 Frequency effect The dimensions are in accordance with GD/T196, and the tolerances are in accordance with GD/T197 6II grade fineness 4.4 The surface should not have cracks, slaps The defects that affect the degradation, and try to eliminate the incomplete effect 50
248-32
4.5 years each joint nut is stamped with a steel stamp on the surface (the marked place in the figure), and the stamp content is: [Month/T1308.9 specification, batch number,
4. The machine dimension tolerance of the maintenance technical note is in accordance with the provisions of B door 1U4. 4. The screw part should take measures to prevent biting. 4. The joint medium is all super + liquid depth damage: magnetic particle inspection and other technical changes are in accordance with the provisions of JB/Ting [308.2. 5 Marking example
Number of 15mm joint nut:
Joint girl V15J130891999
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