1. Specification references
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this document, and the most recent version of the referenced document (including all amendments) applies to documents that are not dated.
GB/T 222 Chemical composition allows deviation
GB/T 223 Series Methods for chemical analysis of steel and alloys
GB/T 228.1 Metallic materials - Tensile testing
GB/T 230.1 Metallic materials - Rockwell hardness test
GB/T 241 Hydraulic test method for stainless Capillary pipe
GB/T 246 flattening test method for stainless Capillary pipe
GB/T 2102 Acceptance, packing, marking and quality certificate of stainless coiled Capillary tubing
GB/T 3090 Stainless steel small diameter seamless pipe
GB/T 11170 Determination of multi-element content of stainless steel coiled tubing
2. Terms and definitions
The following terms and definitions apply to this standard
Stainless steel coiled capillary tubing is mainly used in hydraulic control system, it must go through the hydraulic test, the coiled pipe to 7.0MPa for the test pressure.
OD 8mm Thickness 1mm Length 300m Material 304（*）Sasamtetal coiled capillary tubing. Remark *: Material base on 4.2 request test；
4.1 Stainless steel coiled capillary tube shall be manufactured in accordance with the technical documents approved by the prescribed procedures and shall comply with the requirements of this standard.
4.2 For the manufacture of stainless capillary tubing line of the material, the chemical composition should be consistent with Table 1, the mechanical properties should be consistent with the provisions of Table 2. If the customer has the special requirements, according to customer requirements, the chemical composition of the product, mechanical properties should meet the requirements of the corresponding standards.
Table 1 Coiled Capillary Chemical Composition
Table 2 Coiled Capillary mechanical properties
Elongation after breaking
4.3 Surface treatment state and surface quality：
Stainless steel coiled capillary tubing should be bright treatment, inside and outside the surface should be smooth, no stratification, cracks, folding, miscellaneous skin, twisted, etc., allowed to have no more than a slight tolerance of wall thickness of the slight scratch, pressure pit, Depression, protrusion and so on.
4.4 Geometric dimensions
4.4.1 Stainless steel coiled capillary tubing length,outside Diameter, wall thickness and other requirements should be consistent with the provisions of Table 3.
4.4.2 Table 3 shows the OD of the deviation is not sufficient to indicate the thin-walled tube oval. The deviation between the maximum and minimum diameters of the cross sections of these control pipes shall not exceed 200% of the allowable deviation of the outer diameters listed in Table 3, and the average diameter of any section shall be within the permissible deviation.
Table 3 Geometric dimensions & Allow deviation
DO Allow deviation（mm）
Thickness Allow deviation（mm）
4.5 Flattening performance
Stainless steel coiled capillary tubing flattening test, the welding should be in the direction of force 90 °, pressure to the pipe OD of 2/3, No cracks or cracks may occur after crushing.
4.6 Hydraulic performance
Stainless steel coiled capillary tubing by the pressure of 7.0MPa, and pressure 5mins pressure test, should be no leakage。
4.7 Intergranular corrosion
Stainless steel coiled capillary tubing immersed in sulfuric acid pool for 16h, 180 ° bending, no intergranular corrosion cracking.
4.8 Raw Material Request
4.8.1 The raw materials of the products shall conform to the relevant standards
4.8.2 Raw materials should be selected with product standards and factory inspection of qualified products, each batch of raw materials should be tested before use before use
5. Test Methods
5.1.1 Each batch of stainless steel capillary pipe must be sampled and tested according to GB / T 230.1 for hardness testing。
5.1.2 Each batch of sampled stainless steel coiled tubing in the test, sampling tube head, tail each time, each test must be in the same sample on the 4 point test.
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