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GB/T 3089-2020 English PDF (GBT3089-2020)

GB/T 3089-2020 English PDF (GBT3089-2020)

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GB/T 3089-2020: Seamless ultra-thin wall stainless steel tubes

This Standard specifies the ordering content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of seamless ultra-thin wall stainless-steel tubes. This Standard is applicable to spinning or cold-rolled (drawn) seamless ultra-thin wall stainless-steel tubes.
GB/T 3089-2020
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.15
H 48
Replacing GB/T 3089-2008
Seamless Ultra-Thin Wall 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 Ordering Content ... 6
4 Size, Shape, Weight and Allowable Deviation ... 7
5 Technical Requirements ... 9
6 Test Methods ... 11
7 Inspection Rules ... 12
8 Packaging, Marking and Quality Certificate ... 13
Seamless Ultra-Thin Wall Stainless Steel Tubes
1 Scope
This Standard specifies the ordering content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of seamless ultra-thin wall stainless-steel tubes.
This Standard is applicable to spinning or cold-rolled (drawn) seamless ultra-thin wall stainless-steel tubes (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 Content
GB/T 223.84 Steel and Iron - Determination of Titanium Content -
Diantipyrylmethane Spectrophotometric Method
GB/T 223.85 Steel and Iron - Determination of Sulfur Content - Infrared Absorption Method after Combustion in an Induction Furnace
GB/T 223.86 Steel and Iron - Determination of Total Carbon Content - Infrared Absorption Method after Combustion in an Induction Furnace
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature
GB/T 2102 Acceptance Packing Marking and Quality Certification of Steel Pipe GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing
GB/T 4334-2020 Corrosion of Metals and Alloys - Test Methods for Intergranular Corrosion of Austenitic and Ferritic-Austenitic (Duplex) Stainless Steels GB/T 10561-2005 Steel - Determination of Content of Nonmetallic Inclusions - Micrographic Method Using Standards Diagrams
GB/T 11170 Stainless Steel - Determination of Multi-Element Contents - Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the Determination of Chemical Composition
GB/T 20123 Steel and Iron - Determination of Total Carbon And Sulfur Content Infrared Absorption Method after Combustion in an Induction Furnace (Routine Method)
3 Ordering Content
The contract and ordering list that order products according to this Standard shall include the following contents:
a) This Standard number;
b) Product name;
c) Steel designation;
d) Size and specification;
e) Ordering quantity (total weight or total length or the number of pieces); 5.5.2 The tube blanks of 06Cr17Ni12Mo2Ti and 06Cr18Ni11Ti designations shall be inspected for nitride [TiN, Ti(N, C)]; and TiN and Ti(N, C) inclusions that appear in the same field of view shall be evaluated together. The nitrides in a chain distribution are represented by E1, and the evaluation shall be graded according to the distribution pattern of GB/T10561-2005 with reference to the category B inclusion pattern classification. The nitrides with irregular (dispersed) distribution are represented by E2, and the evaluation shall be graded according to the distribution pattern of GB/T10561- 2005 with reference to the category D inclusion pattern classification. Classes E1 and E2 inclusions are reported separately. The grades of Classes E1 and E2 nitrides shall conform to the provisions of Table 7.
Table 7 ?€? Nitrides
5.6 Intergranular corrosion
Steel tubes delivered in heat-treated state shall be subjected to intergranular corrosion test in accordance with the provisions of Method E in GB/T 4334-2020. After the test, the sample shall not show any tendency to intergranular corrosion.
5.7 Surface quality
5.7.1 There should be no cracks, folds, rolling-folds, delamination, scars, scaly thorns, plaques, as well as scratches, pits and indentations with depth exceeding the lower deviation of the wall thickness on the inner and outer surfaces of the steel tube. Slight spiral corrugations, wire marks and non-damaging concave surfaces are allowed to exist.
5.7.2 The surface roughness R?? of the steel tube shall be no greater than 1.6??m. 6 Test Methods
6.1 Sampling for the analysis of chemical composition of steel tube shall be conducted according to rules of GB/T 20066. The analysis of chemical composition is usually carried out according to GB/T 11170, GB/T 20123 or other general methods. When arbitrating, it shall be carried out according to the provisions of GB/T 223.11, GB/T 223.25, GB/T 223.28, GB/T223.59, GB/T223.60, GB/T223.63, GB/T 223.84, GB/T 223.85, GB/T 223.86.
6.2 The size and shape of the steel tube shall be measured one by one with a measuring tool that meets the accuracy requirements.
6.3 The inner and outer surfaces of steel tubes shall be visually inspected one by one Class
Grade
Class E1 (chain distribution) Class E2 (dispersed distribution)

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