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This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 3089-2008 Seamless ultra-thin wall stainless steel tubes, and the following main technical changes have been made with respect to GB/T 3089-2008:
——The Clause “Application scope” is modified by adding the contents of cold drawing (see Clause 1 hereof; Clause 1 of Edition 2008);
——The normative references are modified (see Clause 2 hereof; Clause 2 of Edition 2008);
——The order contents are modified (see Clause 3 hereof; Clause 3 of Edition 2008);
——The dimension and specification range of steel tubes are modified (see 4.1 hereof; 4.1.1 of Edition 2008);
——The permissible tolerances for dimension are modified (see 4.2 and 4.3 hereof; 4.1.2 and 4.1.3 of Edition 2008);
——The designation 06Cr17Ni12Mo2 is added (see 5.1.1 hereof);
——The smelting method of steel is modified (see 5.2.1 hereof; 5.2.1 of Edition 8);
——The manufacturing method of steel tubes is modified (see 5.2.2 hereof; 5.2.2 of Edition 2008);
——The mechanical properties are modified (see 5.4 hereof; 5.4 of Edition 2008);
——The requirements for nonmetallic inclusions are added (see 5.5.2 hereof);
——The sampling method and test method of steel tube inspection items are modified, and the sampling quantity, sampling method and test method of nonmetallic inclusions are added (see 6.1, 6.2, 6.3, 6.4 and 7.3 hereof; Clause 6 and 7.3 of Edition 2008).
This standard was proposed by China Iron and Steel Industry Association.
This standard is under the jurisdiction of SAC/TC 183 National Technical Committee on Iron and Steel of Standardization Administration of China.
The previous editions of this standard are as follows:
——GB/T 3089-1982, GB/T 3089-2008.
Seamless ultra-thin wall stainless steel tubes
1 Scope
This standard specifies the order contents, dimensions, shapes and weights, technical requirements, test methods, inspection rules, and packaging, marking and quality certificate of seamless ultra-thin wall stainless steel tubes.
This standard is applicable to spinning or cold rolling (drawing) of seamless ultra-thin wall stainless steel tubes (hereinafter referred to as steel tube).
2 Normative references
The following documents are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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 α-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 alloy—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 samples and 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 Order contents
Contracts or orders made under this standard shall cover the following items:
a) No. of this standard;
b) Product name;
c) Steel designation;
d) Dimension and specification;
e) Order quantity (total weight or total length or number);
f) Delivery state;
g) Special requirements.
4 Dimensions, shape, weight and permissible tolerances
4.1 Outer diameter and wall thickness
The nominal outer diameter (D) and nominal wall thickness (S) of steel tubes shall meet those specified in Table 1. As required by the purchaser, steel tubes of dimensions other than those specified in Table 1 may be supplied upon agreement between the supplier and the purchaser.
Table 1 Outer diameter and wall thickness of steel tubes In: mm
Outer diameter × wall thickness Outer diameter × wall thickness Outer diameter × wall thickness Outer diameter × wall thickness Outer diameter × wall thickness
7 × 0.15 35 × 0.5 60 × 0.25 75.5 × 0.25 95.6 × 0.3
10.3 × 0.15 40.4 × 0.2 60 × 0.35 75.6 × 0.3 101 × 0.5
10.4 × 0.2 40.6 × 0.3 60 × 0.5 82.4 × 0.4 101.2 × 0.6
12.4 × 0.2 41 × 0.5 61 × 0.35 83.8 × 0.5 110.9 × 0.45
15.4 × 0.2 41.2 × 0.6 61 × 0.5 89.6 × 0.3 125.7 × 0.35
18.4 × 0.2 48 × 0.25 61.2 × 0.6 89.8 × 0.4 150.8 × 0.4
20.4 × 0.2 50.5 × 0.25 67.6 × 0.3 90.2 × 0.4 250.8 × 0.4
24.4 × 0.2 53.2 × 0.6 67.8 × 0.4 90.5 × 0.25
26.4 × 0.2 55 × 0.5 70.2 × 0.6 90.6 × 0.3
32.4 × 0.2 59.6 × 0.3 74 × 0.5 90.8 × 0.4
4.2 Permissible tolerances of nominal outer diameter
The permissible tolerances of the nominal outer diameter of the steel tube shall meet those specified in Table 2. When the permissible tolerances level of the steel tube dimension is not indicated in the contract, the permissible tolerances of the outer diameter of the steel tube shall be delivered according to the ordinary level.
Table 2 Permissible tolerances of nominal outer diameter In: mm
Nominal outer diameter D of steel tube Permissible tolerances
Ordinary level High level
≤ 12.4 ± 0.10 ± 0.08
> 12.4–32.4 ± 0.15 ± 0.10
> 32.4–60 ± 0.35 ± 0.25
> 60 ± 1%D ± 0.75%D
4.3 Permissible tolerances of nominal wall thickness
The permissible tolerances of nominal wall thickness of steel tube shall meet those specified in Table 3. When the permissible tolerances level of steel tube dimension is not indicated in the contract, the permissible tolerances of steel tube wall thickness shall be delivered according to the ordinary level.
?
Table 3 Permissible tolerances of nominal wall thickness In: mm
Steel tube dimension Permissible tolerances
Nominal outer diameter (D) Nominal wall thickness (S) Ordinary level High level
≤ 60 ≤ 0.20 ± 0.03 + 0.03
? 0.01
0.25 + 0.04
? 0.03 + 0.03
? 0.02
0.30 ± 0.04 ± 0.03
0.35 + 0.05
? 0.04 + 0.04
? 0.03
0.40 ± 0.05 ± 0.04
0.50 ± 0.06 + 0.05
? 0.04
0.60 ± 0.08 ± 0.05
> 60 ≤ 0.25 ± 0.04 ± 0.03
0.30 ± 0.04 + 0.04
? 0.03
0.35 ± 0.05 ± 0.04
0.40 ± 0.05 + 0.05
? 0.04
0.45 ± 0.06 ± 0.05
0.50 ± 0.06 ± 0.05
0.60 ± 0.08 ± 0.05
> 0.60–0.80 ± 0.10 ± 0.06
> 0.80–1.0 ± 0.12 ± 0.08
> 1.0 ± 0.15 ± 0.10
4.4 Length
4.4.1 Random length
The random length of steel tubes is 800 mm–6,000 mm. Other lengths of steel tubes may also be supplied after negotiation between the supplier and the buyer and indicated in the contract.
4.4.2 Cut length
The cut length of steel tubes shall be within the range of random length, and the permissible tolerance of its length is mm.
Foreword i
1 Scope
2 Normative references
3 Order contents
4 Dimensions, shape, weight and permissible tolerances
5 Technical requirements
6 Test methods
7 Inspection rules
8 Packaging, marking and quality certificate
