JB/T 6296.1-1992 Steam turbine piping accessories elbows, tees, reduction joints JB/T6296.1-1992 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
Elbows, Tees and Reducers
This standard specifies the size series and basic requirements for elbows, tees and reducers. This standard applies to the manufacture and acceptance of elbows, tees and reducers used in the steam turbine industry. 2 Reference standards
Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products GB223.' Chemical analysis methods for steel and alloys GB228
Metal tensile test method
Metal Charpy (U-notch) impact test method Metal Brinell hardness test method
GB1804 Tolerances and fits Limit deviations of dimensions without tolerances GB5310 Seamless steel tubes for high-pressure boilers
JB2900 Technical conditions for paint for steam turbines
Technical conditions for anti-rusting of steam turbines
JB2901
JB4377 Provisions for shape and position tolerances of steam turbines without tolerances GB699
Technical conditions for high-quality carbon structural steel
3 Structural types and size series
3. 1. The type and size of the butt-welding 45° elbow are shown in Figure 1 and Table 1. R=1.5D
D——Outer diameter
Bending radius
Mark: Name D×D×8Standard number
8Wall thickness
Example: Butt-welding 45° elbow 50×57×5JB/T6296.1-92Approved by the Ministry of Machinery and Electronics Industry on 1992—06-26 16
—Structural length
JB/T6296.1-92
—Nominal diameter
Implementation of 1993-01-01
P,=4MPa
JB/T6296.1-92
P,=6MPa
The types and sizes of socket-welded 45° elbows are shown in Figure 2 and Table 2. E9
口A-wrench opening size
P,=8MPa
d,—Distance
P—Die forging curvature size
Mark: Name Nominal diameter Type Material Standard number Weight
P,=10MPa
d: Sleeve welding diameter
P,=12MPa
h——Sleeve welding pipe depth||t t||Arm radius of sleeve
Example: Sleeve welding 45° elbow 50.81 type 12Cr2MolJB/T6296.1-92P,=16MPa
Nominal diameter
38.1(No. 1
50:8(2m)
.76.2(3\)
Material grade
15Cr1Mo
15CriM0
15Cr1Mo
JB/T6296.1-92
3.3 The types and dimensions of the butt-welded large radius 90° elbows are shown in Figure 3 and Table 3. Figure 3
D Outer diameter
Bending radius
Mark: Name D%×D×8 Standard number
Structure length
Shown Example: Butt-welding type large radius 90° elbow 50×57×5JB/T6296.1-92Dn
-nominal diameter
JB/T6296.1-92
P,=4MPa
P,=6MPa
For the type and size of butt-welding type small radius 90° elbow, see Figure 4 and Table 4. Figure
D-outer diameter||tt ||R Bending radius
Mark: Name DXD×Standard number
8—Wall thickness
P,10MPa
Structural length
Example: Butt-welded small radius 90° elbow 50×57×5JB/T6296.1-92Dn
P,=16MPa
Nominal diameter
JB/T62 96.1-92
P,=4MPa
For the types and dimensions of the sleeve-welded 90° elbow, see Figure 5 and Table 5. Concept
P,=6MPa
□A-wrench opening size H-—elbow end face to center size d, diameter
Marking: Name Nominal diameter Type Material brand Standard number de
Example: Sleeve-welded 90° elbow 3 8.1(No.1\)Type 125JB/T6296.1-9220
P,=10MPa
Socket welding diameter
P,=16MPa
Arc radius
Nominal diameter
12.7(No.)
25.4(1°)
63.5(No.2）
38.1 No. 1 2
63.5(No. 2)
JB/T6296.1-92
Material brand
12Cr2Mol
15Cr1Mo
15Cr1Mo
12Cr2Mol
12Cr2Mol
12Cr2Mol
15Cr1Mo
12Cr2Mol
12Cr2Mol
12Cr2Mol
15Cr1Mo
12Cr2Mol
12Cr2Mol
12Cr2Mol
3.6 For the types and sizes of socket-welded equal-diameter tees, see Figure 6 and Table 6d
JB/T6296.1-92
Port A—Wrench opening size
—Sleeve welding bottom to center size
dDiameter
Mark: Name Nominal diameter Type Material Brand Standard No. Example: Sleeve welding tee 50.8(-
Nominal diameter
12.7(1/2*)
19(3/4m)||tt| |38.1(11/2)
63.5(21/2\)
38.1(11/2\)
19(3/4)
38.1(11/2)
63.5(21/2
Dimension from end face to center of joint
Socket welding diameter
\)I type 12Cr2MolJB/ T6296.1-92
Material brand
15Cr1Mo
15Cr1Mo
15Cr1Mo
12Cr2Mol
12Cr2Mol
15Cr1Mo
12Cr2Mol
12Cr2Mol
12C r2Mol
12Cr2Mol
Arc radius
JB/T6296.1-92
For the types and sizes of butt-welded forged tees, see Figure 7 and Tables 7 and 8. 3.7
-Neck diameter
-Outer diameterbzxZ.net
-Neck straight height
Mark: Name Nominal diameter Type Material brand d,
-Inner diameter
Structural length
Standard number
Example: Butt-welded forged tee 201 type 12Cr1MoVAJB/T6296.1-92
Dimension from joint end face to center
Structural width
Material brand
Working pressure, temperature
12Cr1MoVA|| tt||P=10MPa(100kg)
tm540c
P=18MPa(184)
t=230℃
Material brand
Working pressure
P≤10MPa
3.8 For the type and size of the reduction section, see Figure 8 and Table 9D, outer diameter of the large end
Mark: Name D,× D,×8
Standard number
JB/T6296.1-92
Outer diameter of small end
Example: Reduction section 50×40×5JB/T6296.1-9224
Structural length
Big end millimeter small end
50×40
4Material
4.1Material shall be selected as specified in Table 10.
P,=4MPa
JB/T6296.192
P,=6MPa
P,=8MPa
P,=10MPa
P,=12MPa
P,16MPa
Butt-welding 45°elbow
Butt-welding 90°elbow
Sleeve-welding 45°elbow
Sleeve-welding 90°elbow
Sleeve-welding tee
Butt-welding forged tee
Note: The steel types in brackets are not recommended. 4.2 Chemical composition of steel
JB/T6296.1-92
oCr19Ni9
15Cr1Mo
15Cr1Mo
12Cr2Mol
(1Cr18Ni9Ti)
12Cr1MoVA
4.2.1 The chemical composition of 20 and 25# steels shall comply with the provisions of GB699. 4.2.2 The chemical composition of 15Cr1Mo, 12Cr2Mol, 12Cr1MoVA and 0Cr19Ni9 steels shall be as specified in Table 11. Table 11
15Cr1Mo
12Cr2Mol
12Cr1MoVA
OCr19Ni9
4.2.3 The chemical analysis method shall be carried out in accordance with the provisions of GB223 and GB222. 4.3 The mechanical properties of steel shall conform to the provisions of Table 12. Table 12
123~167
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