This standard applies to brazed stainless steel hoses made of 1Cr18Ni9Ti stainless steel strips and stainless steel wires. It can be used as protective sleeves for cables and as pipelines for non-corrosive hydraulic oil, fuel, lubricating oil and steam systems. GB/T 3642-1983 S-type brazed stainless steel metal hose GB/T3642-1983 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
S-type brazed stainless steel flexible metallic hose
Type S brazed stainless steel flexible metallic hose
UDC669.14-462
:621.791.8
GB 3642—83
This standard applies to brazed stainless steel hoses made of 1Cr18Ni9Ti stainless steel strips and stainless steel wires (hereinafter referred to as hoses). It can be used as the protective sheath of cables and the delivery pipeline of non-corrosive liquids, oil, fuel oil and steam systems. The use temperature range of the hose is 0~40n℃.
1 Classification, code
The brazed stainless steel hose in this standard is a pressure-resistant sealing hose. The code is S-type stainless steel hose. 2 Dimensions, shape, weight, length
2.1S-type hose is a hose with an interlocking structure formed by spiral winding. Its structure is shown in the figure below: Hose structure diagram
L—hose outer diameter, d—hose inner diameter S—steel belt diameter 2.2The dimensions of S-type hose and its allowable deviation conform to the provisions of Table 1. Table 1
Nominal inner diameter
Minimum inner diameter
Outer diameter of hose
21.2 -0.3
Published by National Bureau of Standards in 1983
05.02
Thickness of steel strip
Diameter of braided steel wire
Performance data of hose
Working pressure at 20℃Burst pressure at 20℃kgf/cm2
kgf/em2
Theoretical weight
Implemented in 1984-03-01
Nominal inner diameter
Minimum inner diameter
Outer diameter of hose
GB 3642—88
Continued Table 1
Thickness of steel strip
Diameter of braided steel wire
Performance parameters of hose
20%:L working pressure,J120℃ bursting pressure kgficm2
kgf/cm2
Juice: ① The theoretical weight of the hose does not include the weight of the joint. The theoretical weight and the original length of the steel strip are for reference only. ②The specifications of the strap number are not recommended. 210
180,
Theoretical weight
2.3 The length of each hose should not be less than 500mm, but hoses with a length of 300mm to 500mm are allowed to be delivered, and the number shall not exceed 15% of the total number of deliveries.
2.4 The delivery of hoses is divided into the following two types
2.4.1 Soft back without pipe joints.
2.4.2 Hose assembly with pipe joint.
2.5 Marking example: The brazed stainless steel metal hose with a nominal inner diameter of 16mm is marked as: S10·GB3642-833 Technical requirements
3.1 The hose is made of 1Cr18Ni9Ti steel strip, and its technical conditions should comply with the soft steel condition of GB2598-81 "Cold-rolled stainless and heat-resistant steel strip". The 1Cr18Ni9Ti steel wire used for the braided mesh should comply with the relevant standards. The pipe joint solder uses HI.312 cadmium solder or other silver-based solder.
3.2 The sealing of the lock seam of each hose must pass the 3~6kf/cm2 airtightness test. 3.3 Requirements for steel wire braided mesh:
3. 8. 1 The braiding angle of the steel wire braided mesh is 45\5\, and the braiding density is above 85%. 3.3.2 The steel wire braided mesh should fit the pipe body, and the tightness of the steel wire should be uniform. 3.3.3 The steel wire braided mesh is allowed to have a small amount of back strands and individual broken wires, but the number of broken wires per hose shall not exceed 2, and the H broken wires shall not be in the same strand of steel wire.
3.3.4 The steel wire braided mesh is not allowed to have rust, indentation and other damage. 3.4 The high-frequency pin welding of the hose joint shall meet the following requirements: 3.4.1 The solder shall cover the steel wire end of the mesh and the outer edge of the collar. 3.4.2 The solder shall not be left on the collar and the steel wire, the corners shall be smooth, and polished after welding. 3.5 Before leaving the factory, the hose assembly shall be subjected to hydraulic pressure test according to the internal pressure resistance requirements of the joint. For hoses that are not shipped as an assembly, the quality of the welding of the joints and accessories within 2mm of the joints and the tightness of the hoses shall be the responsibility of the purchaser. 3.6 For hoses for special purposes, a technical agreement shall be signed based on the negotiation between the supply and demand parties to stipulate the content, methods and requirements of the supplementary tests. 4 Test methods
GB 3642-83
4.1 The inner diameter of the hose and the outer diameter after braiding shall be measured with a vernier caliper. When measuring the outer diameter of the braiding, the back of the steel wire shall be avoided. The length of the hose shall be measured in a straight state, starting from 10 meters. 4.2 The quality of the hose surface shall be observed with the naked eye.
4. The manufacturer shall regularly extract test pieces from qualified hoses for routine tests, and the value of the bursting positive force shall not be less than the provisions of Table 1.
4. See Appendix A for the test method of the airtight parts of the pipe body. 4.5 See Appendix B for the internal pressure resistance test.
5 Inspection rules
The inspection and acceptance of the hose should be carried out by the supplier's technical supervision department. The hoses should be picked and accepted one by one before leaving the factory. 6 Packaging, marking and quality certificate
6.1 The surface of the hose should be kept clean, and kerosene residue from the hydraulic test is allowed. The hose should be rolled into a circle and packed in the box. The inner circle should be larger than 20 times the nominal inner diameter of the hose. The box must be dry, and moisture-proof paper or plastic film should be used as a cushion inside the box. The outside of the box should be tightened with steel belts or hard plastic belts. According to the requirements of the buyer, it is not necessary to pack the hoses in boxes. The size of the batch hose packaging is determined by negotiation between the supplier and the buyer. 6.2 A packing list should be attached to the box. The outside of the box should be clearly marked with items such as factory name, product name, weight, box number and shipping location. 6.3 Each hose should have a quality certificate, which should indicate: product name, specification, length, number of hoses, working pressure resistance, date of manufacture, inspector code and technical inspection stamp.
GB 3642-83
Appendix A
Gas tightness test method for hose body
(Supplement)
Gas tightness test of hose body is carried out one by one after needle welding of hose body. Block one end of hose and pass 3~ pressurized compressed air into the other end, and immerse the whole hose body in water. Keep the pressure in water for 1~2 minutes. There should be no leakage, which means the air tightness is qualified. If leakage is found, the leakage should be marked and cut off. GB3642-83
Appendix B
Pressure test method for hose assemblybzxZ.net
(Supplementary part)
The pressure test of hose assembly is used as the factory inspection for finished products. Plug one end of the hose with a plug, and inject kerosene into the other end to 2-3 gauge pressures. Loosen the plugged end, release the remaining air, and continue to inject kerosene to 5-10 gauge pressures. Stay for 2 minutes to check for leakage. If there is leakage, continue to inject kerosene to the agreed pressure value. Stay for 2-3 minutes. There should be no leakage, which means it is qualified. The schematic diagram of the device is as follows:
—Hose assembly: 2: Leli&, 3—shutdown, 4—Oil pump GB 3642-83
(Reference part)
The dimensions of the matching parts of the hose assembly joint, ring, and nut are shown in Table C. Table C
Nominal inner diameter
(22】
Hose outer diameter
Hose minimum inner diameter
Nozzle end diameter
Ring inner diameter
Sheath nut
M16× 1.5
M24 ×1.5
M27 ×1.5
M33×2
M36×2
M39×2
M45×2
M48×2
M56×2
M58×2
M68×2
M70×2
M72×2
D.1 Calculation formula for nominal length of horizontal stroke: Where: 1.—Assembly length of hose,
H,-maximum vertical height.
H—minimum vertical height;
GB 3642—83
Appendix D
Calculation method for design and use length of hose
(reference)
L =4R+2-1.57S
H, = 1.43R + I+ 0.785S
H,=1.43R+/+
1Metal fitting (including sleeve) length:
S—Working distance:
R——The radius of curvature shall be 10 times the inner diameter of the hose, and the radius of curvature shall be within the range of 11 to 20 times. GB 3642—83
Appendix E
Hose Instructions
(reference)
E.1This hose is a bean-lock type structure, and its lock seam is brazed and sealed with silver-lithium solder. It is used to transport various non-corrosive liquids and steam. E.2The operating temperature range of the hose is -20℃ when used as a wire protection sleeve, and the temperature range is a when used to transport liquids and steam.
E.3The minimum bending radius of the hose when in use is not less than 1 times the nominal inner diameter of the hose. That is, Rmin<.10d. Do not bend less than its minimum bending radius value to avoid damaging the hose or reducing its service life. E4The hose should be placed in a dry and clean environment to prevent rust. E.5Do not damage the steel wire to avoid reducing the burst strength. E.6Media: hydraulic oil, fuel, lubricating oil and steam. E.7
The hose must not be twisted during installation and use. E.8If the braided mesh sleeve shrinks, do not pull the tube body with force, but pull the braided mesh sleeve to avoid damaging the tube body. Additional instructions:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard was drafted by Shanghai Metal Hose Factory and the main drafter of this standard is Jin Shixin.
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