GB/T 9130-1988 Technical Specifications for Metallic Ring Gaskets for Steel Pipe Flange Connections GB/T9130-1988 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Technical conditions for metal ring gaskets for steel pipe flange joints
This standard applies to GB9128.1~9128.2-88 "Metal ring gaskets for steel pipe flange joints".
1 Materials
1.1 The materials and applicable scope of the gaskets shall be determined in accordance with Table 1. Table 1
Material grade
.08 or 10
0OCr17Ni14M2
CCr19Ni9
The chemical composition (%) of soft iron shall be in accordance with the provisions of Table 2. C
GB 9130 ---88
Maximum use temperature
1.2 The material hardness of the ring gasket should be 30~40HB lower than that of the flange material, and its maximum hardness value shall not exceed the provisions of Table 3. Approved by the State Machinery Industry Commission on April 9, 1988 and implemented on January 1, 1989bzxZ.net
Ring gasket material
08 or 10
00Cr17Ni14Mo2
OCr19N i9
GE9130--88
Maximum value
1.3 The hardness of the annular pad should be uniform. The hardness at four symmetrical points on the entire circle should be measured. The average value should meet the requirements of Table 3. 2 The limit deviation of the size of the annular pad shall be in accordance with the requirements of Table 4. Table 4
Dimension name
Pitch diameter of pad
Width of pad
Height of pad
Bottom width of octagonal pad||tt ||Angle 23°
Radius of fillet of gasket
Limited tolerance
Note: 1) As long as the height difference between any two points of the ring gasket does not exceed 0.4mm, the limit deviation of the height (H) of the ring gasket can be +1.2mm. mm
3 The sealing surface of the ring seal (the inclined surface of the octagonal gasket and the round surface of the elliptical gasket) shall not have scratches, slag marks, cracks and sag points, and the surface roughness shall not exceed R.1.6pm.
4 For ring seals made of rust-prone materials (such as soft iron, No. 10 steel), anti-rust treatment should be carried out after inspection. 5 The outer edge surface of each ring seal should be marked with the manufacturer's trademark, the ring number with the letter R and the material number. Additional notes:
This standard is under the jurisdiction of the Standardization Institute of the State Machinery Industry Commission. This standard was jointly drafted by the Standardization Institute of the State Machinery Industry Commission and Dalian Institute of Technology. The main drafters of this standard are Li Xinhua, Chen Lin and Wang Liye
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