GB/T 32796-2016Cold rolling ferritic stainless steel sheet and strip for automotive exhaust system (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the classification, code, order content, size, shape, mass and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of cold rolling ferritic stainless steel sheet and strip for automotive exhaust system.

This standard applies to the cold rolling ferritic stainless steel wide strip AND its sheared sheet and longitudinally cut wide stripe with a thickness of 0.4 mm ~ 3.0 mm (abbreviated as steel sheet and strip) for automotive exhaust system.

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 Standard.

GB/T 222 Permissible tolerances for chemical composition of steel products

GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane 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 Method for chemical analysis of iron, steel and alloy - The reduced molybdosilicate spectrophotometric method for the determination of acid-soluble silicon content

GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visible titration or potentiometric titration method

GB/T 223.16 Methods for chemical analysis of iron, steel and alloy - The chromotropic acid photometric method for the determination of titanium content

GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation iodometric method for the determination of copper content

GB/T 223.19 Methods for chemical analysis of iron, steel and alloy - The NHCM-trichloromethane extraction spectrophotometry for the determination of copper content

GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The dimethylglyoxime spectrophotometric 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 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method

GB/T 223.28 Methods for chemical analysis of iron, steel and alloy - The alpha-benzoinoxime gravimetric method for the determination of molybdenum content

GB/T 223.36 Method for chemical analysis of iron, steel and alloy - The neutral titration method for the determination of nitrogen content after distillation separation

GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the Chlorosulfonol S spectrophotometric method

GB/T 223.53 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of copper content

GB/T 223.58 Methods for chemical analysis of iron, steel and alloy - The sodium arsenite-sodium nitrite titration method for the determination of manganese content

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 223.61 Methods for chemical analysis of iron, steel and alloy - The ammonium phosphomolybdate volumetric method for the determination of phosphorus content

GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content

GB/T 223.69 Iron, steel and alloy - Determination of carbon - Gas-volumetric method after combustion in pipe furnaces

GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1: Method of test at room temperature

GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1: Test methods (scales A, B, C, D, E, F, G, H, K, N, T)

GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test methods

GB/T 232 Metallic materials - Bend test

GB/T 247 General rules of acceptance, package, mark and certification for steel sheets and strips

GB/T 708-2016 Dimensions, shape, weight and tolerance for cold-rolled steel plate

GB/T 2975 Steel and steel products - Location and preparation of test pieces for mechanical testing

GB/T 3280 Cold rolled stainless steel plate, sheet and strip

GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1: Test method

GB/T 8170 Rules for rounding off for numerical values & expression and judgment of limiting values

GB/T 11170 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (Routine method)

GB/T 14203 General rules for spark discharge atomic emission spectrometry

GB/T 17505 Steel and steel products - General technical requirements for delivery

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) rolling marks, or color difference the depth of which is less than half of the thickness tolerance.

GB/T 2975

3 Hardness 1 per batch

GB/T 230.1, GB/T 231.1, GB/T 4340.1

6 Technical requirements

6.6.2.3 The edge of the steel strip shall be flat. It is not allowed for the edge cutting steel strip edge to have irregular cutting the depth of which is more than half of the width tolerance OR the burrs more than the thickness tolerance of the steel strips; AND it is not allowed for the edge uncut steel strips to have edge crack which is more than width tolerance.

7 Test methods

7.2 Inspection items, sampling quantity, sampling methods and location, and test methods of steel sheets and strips The inspection items, sampling quantity, sampling methods and location, and test methods of each batch of steel sheets and strips shall comply with the provisions of Table 12.

Table 12 Test items, sampling quantity, sampling methods and location and test methods No. Inspection items Sampling quantity Sampling method and location Test methods