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GB/T 3090-2020 English PDF (GBT3090-2020)

GB/T 3090-2020 English PDF (GBT3090-2020)

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GB/T 3090-2020: Seamless small diameter stainless steel tubes

This Standard Specifies the classification, ordering content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of seamless small diameter stainless steel tubes. This Standard is applicable to aerospace, electromechanical, instrumentation components, medical needles and other general-purpose seamless stainless-steel tubes with a nominal outer diameter no greater than 6mm.
GB/T 3090-2020
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.15
H 48
Replacing GB/T 3090-2000
Seamless Small Diameter Stainless Steel Tubes
ISSUED ON: APRIL 28, 2020
IMPLEMENTED ON: NOVEMBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Classification ... 6
4 Ordering Content ... 7
5 Size, Shape, Weight and Allowable Deviation ... 7
6 Technical Requirements ... 10
7 Test Methods ... 12
8 Inspection Rules ... 13
9 Packaging, Marking and Quality Certificate ... 13
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 3090-2000 Stainless Steel Small Diameter Seamless Steel Tubes. Compared with GB/T 3090-2000, this Standard made the major technical changes as follows:
--- Modify the normative references (see Clause 2 of this Edition; Clause 2 of the 2000 Edition);
--- Modify the classification method (see Clause 3 of this Edition; Clause 3 of the 2000 Edition);
--- Add the ordering content (see Clause 4 of this Edition);
--- Add the size specifications of the steel tube (see Table 1 of this Edition); --- Delete the mark example (see 4.6 of 2000 Edition);
--- Modify the requirements for normal length (see 5.3.1 of this Edition; 4.3.1 of 2000 Edition);
--- Modify the requirements for the specified length and multiple length (see 5.3.2 of this Edition; 4.3.2 of 2000 Edition);
--- Modify the steel designation representation method and chemical composition (see Table 3 of this Edition; Table 3 of 2000 Edition);
--- Add the steel smelting method and steel tube manufacturing method (see 6.2 of this Edition);
--- Modify the delivery status requirements (see 6.3 of this Edition; 5.2 of 2000 Edition);
--- Add the mechanical performance requirements of steel tubes delivered in hard state (see 6.4 of this Edition);
--- Modify the mechanical properties of the steel tube and steel density (see Table 4 of this Edition; Table 4 of 2000 Edition);
--- Delete the hydraulic test requirements; and add the air tightness test requirements (see 6.6 of this Edition; 5.4.2 of 2000 Edition).
This Standard was proposed by China Iron and Steel Industry Association. This Standard shall be under the jurisdiction of National Technical Committee for Seamless Small Diameter Stainless Steel Tubes
1 Scope
This Standard Specifies the classification, ordering content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of seamless small diameter stainless steel tubes. This Standard is applicable to aerospace, electromechanical, instrumentation components, medical needles and other general-purpose seamless stainless-steel tubes with a nominal outer diameter no greater than 6mm (hereinafter referred to as steel tubes).
2 Normative References
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method
GB/T 223.25 Methods for Chemical Analysis of Iron, Steel and Alloy - The Dimethylglyoxime Gravimetric Method for the Determination of Nickel Content GB/T 223.28 Methods for Chemical Analysis of Iron, Steel and Alloy - The ??- Benzoinoxime Gravimetric Method for the Determination of Molybdenum Content GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony
Phosphomolybdate Blue Spectrophotometric Method
GB/T 223.60 Methods for Chemical Analysis of Iron, Steel and Alloy - The Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon Content
GB/T 223.63 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium (Potassium) Periodate Photometric Method for the Determination of Manganese between the soft state and the hard state.
4 Ordering Content
The contract or order that orders products according to this Standard shall include the following:
a) Number of this standard;
b) Product name;
c) Steel designation;
d) Dimension specifications;
e) Ordering quantity (total weight or total length or the number of pieces); f) Delivery status;
g) Special requirements.
5 Size, Shape, Weight and Allowable Deviation
5.1 Outer diameter and wall thickness
5.1.1 Steel Tubes are delivered as per nominal outer diameter (D) and nominal wall thickness (S). According to the requirements of the purchaser, through the negotiation between the supplier and the purchaser, the steel tube may also be delivered as per the nominal inner diameter (d) and nominal wall thickness or nominal outer diameter and nominal inner diameter.
5.1.2 The nominal outer diameter (D) and nominal wall thickness (S) of the steel tube shall conform to the provisions of Table 1.
bending and/or flattening tests. The test requirements are determined by consultation between the supplier and the purchaser.
6.6 Air tightness
According to the requirements of the purchaser and stated in the contract, the steel tube may be tested for air tightness one by one; the test pressure is 0.59MPa~0.78MPa; the pressure stabilization time shall be no less than 10s; and the steel pipe shall not leak.
6.7 Intergranular corrosion
According to the requirements of the purchaser and indicated in the contract, the intergranular corrosion test may be carried out on the soft-state steel tube with an inner diameter greater than 1.00mm according to the provisions of the Method E in GB/T 4334-2020. After the test, the specimen shall not show any tendency to intergranular corrosion.
6.8 Surface quality
The surface of the steel tube shall be bright and clean, and there shall be no folds or cracks. Slight defects not exceeding half of the wall thickness tolerance are allowed to exist.
7 Test Methods
7.1 Sampling for the analysis of chemical composition of steel tubes shall be conducted according to the rules of GB/T 20066. The chemical composition analysis is usually carried out according to GB/T 11170, GB/T 20123 or other general methods. When arbitrating, it should be carried out according to the provisions of GB/T 223.11, GB/T 223.25, GB/T 223.28, GB/T 223.59, GB/T 223.60, GB/T 223.63, GB/T 223.84, GB/T 223.85, GB/T 223.86.
7.2 The dimensions of steel tubes shall be measured one by one with measuring tools that meet the accuracy requirements.
7.3 The outer surface of the steel pipe shall be visually inspected one by one under sufficient lighting conditions; at least 2 steel tubes are randomly selected from each batch; and take about 50mm tube sections at any position of the sampled steel tube; and the inner surface is visually inspected under sufficient lighting conditions, If necessary, visually inspect the tube section after dissection.
7.4 The sampling methods and test methods of other inspection items of steel tubes shall comply with the provisions in Table 5.

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