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GB/T 38689-2020 English PDF (GBT38689-2020)

GB/T 38689-2020 English PDF (GBT38689-2020)

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GB/T 38689-2020: Corrosion-resistant alloy cold-rolled sheets and strips

This Standard stipulates the order content, dimensions, shapes, weights, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of corrosion-resistant alloy cold-rolled sheets and strips. This Standard is applicable to nickel-based, iron-nickel-based, pure nickel and nickel-copper-based corrosion-resistant alloy cold-rolled wide strips, and shear sheets and slitting strips with a nominal thickness of 0.1 mm ~ 5.0 mm and a nominal width of not less than 1,500 mm
GB/T 38689-2020
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.50
H 59
Corrosion-resistant Alloy Cold-rolled Sheets and
Strips
ISSUED ON: MARCH 31, 2020
IMPLEMENTED ON: OCTOBER 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Order Content ... 7
4 Dimensions, Shapes and Weights ... 7
5 Technical Requirements ... 13
6 Test Methods ... 11
7 Inspection Rules ... 11
8 Packaging, Marking and Quality Certificate ... 12
Appendix A (informative) Recommended Thermal Treatment Temperatures for Corrosion-resistant Alloy Designations ... 13
Corrosion-resistant Alloy Cold-rolled Sheets and
Strips
1 Scope
This Standard stipulates the order content, dimensions, shapes, weights, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of corrosion-resistant alloy cold-rolled sheets and strips. This Standard is applicable to nickel-based, iron-nickel-based, pure nickel and nickel- copper-based corrosion-resistant alloy cold-rolled wide strips, and shear sheets and slitting strips with a nominal thickness of 0.1 mm ~ 5.0 mm and a nominal width of not less than 1,500 mm (hereinafter referred to as sheets and strips).
2 Normative References
The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 223.3 Methods for Chemical Analysis of Iron, Steel and Alloy - The Diantipyryl Methane Phosphomolybdate Gravimetric Method for the Determination of Phosphorus Content
GB/T 223.4 Alloyed Steel - Determination of Manganese Content - Potentiometric or Visual Titration Method
GB/T 223.5 Steel and Iron - Determination of Acid-soluble Silicon and Total Silicon Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.8 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Fluoride Separation - EDTA Titration Method for the Determination of Aluminum Content
GB/T 223.9 Iron, Steel and Alloy - Determination of Aluminum Content - Chrome Azurol S Photometric Method
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method
GB/T 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy - The Diantipyrylmethane Photometric Method for the Determination of Titanium Content GB/T 223.20 Methods for Chemical Analysis of Iron, Steel and Alloy - The Potentiometric Titration Method for the Determination of Cobalt Content 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 223.29 Iron, Steel and Alloy - Determination of Lead Content - Carrier Precipitation-xylenol Orange Spectrophotometric Method
GB/T 223.30 Methods for Chemical Analysis of Iron, Steel and Alloy - The Arsenazo III Spectrophotometric Method for the Determination of Zirconium Content after Separation by P-bromomandelic Acid
GB/T 223.36 Methods for Chemical Analysis of Iron, Steel and Alloy - The Neutral Titration Method for the Determination of Nitrogen Content after Distillation Separation GB/T 223.38 Methods for Chemical Analysis of Iron, Steel and Alloy - The Anion- exchange Separation-gravimetric Method for the Determination of Niobium Content GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method
GB/T 223.42 Methods for Chemical Analysis of Iron, Steel and Alloy - The Anion- exchange Separation-bromopyrogallol Red Photometric Method for the Determination of Tantalum Content
GB/T 223.43 Iron, Steel and Alloy - Determination of Tungsten Content - Gravimetric Method and Spectrophotometric Method
GB/T 223.50 Methods for Chemical Analysis of Iron, Steel and Alloy - The Phenylfluorone-CTMAB Direct Photometric Method for the Determination of Tin Content
GB/T 223.65 Steel, Iron and Alloy - Determination of Cobalt Content - Flame Atomic Absorption Spectrometric Method
GB/T 223.72 Iron, Steel and Alloy - Determination of Sulfur Content - Gravimetric Method
GB/T 223.73 Iron, Steel and Alloy - Determination of Iron Contents - Titanium Trichloride-potassium Dichromate Titration Method
GB/T 223.76 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrometric Method for the Determination of Vanadium Content GB/T 36164 High Alloy Steel - Determination of Multi-element Contents - X-ray Fluorescence Spectrometry (routine method)
YB/T 4395 Steel Determination of Molybdenum, Niobium and Tungsten Contents - Inductively Coupled Plasma Atomic Emission Spectrometric Method
YS/T 325.2 Methods for Chemical Analysis of Nickel-copper Alloy - Part 2: Determination of Copper Content - Electrolysis Weight Method
3 Order Content
Contracts or orders placing orders in accordance with this Standard shall at least include the following content:
a) Serial No. of this Standard;
b) Product name (or trade name);
c) Uniform digital code or alloy designation;
d) Accuracy of dimensions and shapes (see Chapter 4);
e) Weight or quantity;
f) Smelting method (see 5.2);
g) Delivery state (see 5.3);
h) Special requirements (see 5.7).
4 Dimensions, Shapes and Weights
4.1 Thickness and Allowable Deviations
4.1.1 The thickness and allowable deviations of sheets and strips (excluding narrow strips) shall comply with the stipulations in Table 1.
2) When the nominal thickness is more than 1.0 mm, side wave shall be not more than 0.02.
c) Side wave of strips delivered under the cold-working hardening state shall be determined by the demand-side and the supply-side through negotiation.
4.8 Tower Shape
Strips shall be firmly wound into a roll. In addition, the one-side tower shape of the roll shall be not more than 35 mm. If there are special requirements for the inner diameter of the roll, they shall be indicated in the contract.
4.9 Weight
Sheets and strips shall be delivered in accordance with the actual weight. 5 Technical Requirements
5.1 Chemical Composition
5.1.1 The designation and chemical composition (smelting analysis) of alloy shall comply with the stipulations in Table 9.
5.1.2 The allowable deviations of chemical composition of finished sheets and strips shall comply with the stipulations of GB/T 15007.
5.2 Smelting Method
Unless it is otherwise stipulated in the contract, smelting method shall be independently selected by the supply-side.
5.5 Average Grain Size
The average grain size of NS1102, NS1104, NS1106, NS1502, NS3201, NS3202, NS3203, NS3304, NS3305, NS3308, NS3309, NS3311, NS3312 and NS3313 alloy sheets and strips, which are delivered under the solution state, shall comply with the stipulations in Table 10.
5.6 Surface Quality
5.6.1 The surface of sheets and strips shall be clean; there shall be no defects like cracks, bubbles, scarring, peeling, folding and inclusions, etc. In addition, on the sides of sheets and strips, there shall be no visible delamination. After pickling, the surface of the delivered sheets and strips shall not have oxide scales or over-pickling. 5.6.2 On the surface of sheets and strips, slight and partial defects which are not more than half of the thickness tolerance, such as: spots, pits, indentations, wrinkles and rough roller markings are allowed. However, the minimum thickness of the sheets or strips shall be guaranteed. Any defects exceeding the above-mentioned stipulations may be removed through the method of grinding. The area of removal shall be smooth and without any edges. The depth of allowable defects on the surface and the depth of partial cleaning shall not exceed the minimum allowable thickness of the sheets or strips.
5.7 Special Requirements
In accordance with the demand-side?€?s requirements, through the negotiation between the demand-side and the supply-side, and statement in the contract, special technical requirements may be specified in the chemical composition and chemical properties ensure that the delivered sheets and strips comply with the stipulations of this Standard. The demand-side is entitled to conduct inspection and acceptance inspection in accordance with the stipulations of this Standard.
7.2 Principle of Group Batch
Sheets and strips shall receive acceptance inspection by batches. Each batch shall be constituted of sheets and strips of the same designation, the same furnace No., the same thickness and the same thermal treatment heats.
7.3 Sampling Size and Sampling Location
The sampling size and sampling location of sheets and strips shall comply with the stipulations in Table 14.
7.4 Re-inspection and Determination Rules
7.4.1 When the result of chemical composition analysis is disqualified, re-sampling is allowed, so as to conduct re-inspection of the disqualified elements. If the re-inspection result is still disqualified, then, this furnace batch shall be determined as disqualified. 7.4.2 When one of the test results of room-temperature tensile properties, average grain size, hardness, endurance, intergranular corrosion and non-metallic inclusion is disqualified, then, from the same batch of sheets or strips (including sheets and strips in the previous inspection), take a double size of samples for re-inspection. The re- inspection results shall all comply with the requirements of this Standard. Otherwise, this batch of sheets or strips shall be determined as disqualified. The supply-side is allowed to re-conduct thermal treatment of the sheets or strips that are disqualified in the re-inspection (excluding non-metallic inclusion), then, submit them as a new batch for acceptance inspection.
7.4.3 When the inspection of surface quality, dimensions and shape is disqualified, then, the individual piece (or coil) of sheet or strip shall be determined as disqualified. 8 Packaging, Marking and Quality Certificate
The packaging, marking and quality certificate of sheets and strips shall comply with the stipulations of GB/T 247.

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