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GB/T 33161-2016 English PDF (GBT33161-2016)

GB/T 33161-2016 English PDF (GBT33161-2016)

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GB/T 33161-2016: Carburizing steels for automobile bearings

This Standard specifies the classification and codes, ordering content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certification of carburizing steels for automobile bearings.
GB/T 33161-2016
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.10
H 40
Carburizing Steels for Automobile Bearings
ISSUED ON. OCTOBER 13, 2016
IMPLEMENTED ON. SEPTEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Application Scope ... 4
2 Normative References ... 4
3 Classification and Codes ... 6
4 Ordering Content ... 7
5 Dimensions, Shape and Weight ... 7
6 Technical Requirements ... 9
7 Test Methods ... 13
8 Inspection Rules ... 14
9 Packaging, Marking and Quality Certification ... 16
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of the National Standardization Technical Committee on Steels (SAC/TC 183).
The drafting organizations of this Standard. Jiangsu Xingcheng Special Steel Co., Ltd., China Metallurgical Information and Standardization Institute, Luoyang Bearing Institute Co., Ltd.
The main drafters of this Standard. Xie Junding, Geng Ke, Wang Xiaoning, Yan Chengming, Lei Jianzhong.
Carburizing Steels for Automobile Bearings
1 Application Scope
This Standard specifies the classification and codes, ordering content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certification of carburizing steels for automobile bearings. This Standard applies to carburizing steels for automobile bearings of nominal diameter 4.5 mm ~ 120 mm (hereinafter referred to as steels).
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition dated applies to this document. For undated references, the latest edition of the referenced documents (including all amendments) applies to this Standard.
GB/T 223.5, Steel and Iron ?€? Determination of Acid-soluble Silicon and Total Silicon Content ?€? Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9, Iron, Steel and Alloy ?€? Determination of Aluminium Content ?€? Chrom Azurol S Photometric Method
GB/T 223.11, Iron, Steel and Alloy ?€? Determination of Chromium Content ?€? Visual Titration or Potentiometric Titration Method
GB/T 223.19, Methods for Chemical Analysis of Iron Steel and Alloy ?€? The Neocuproine-chloroform Extraction Photometric Method for the Determination of Copper Content
GB/T 223.26, Iron, Steel and Alloy ?€? Determination of Molybdenum Content ?€? The Thiocyanate Spectrophotometric Method
GB/T 223.29, Iron, Steel and Alloy ?€? Determination of Lead Content ?€? Carrier Precipitation-Xylenol Orange Spectrophotometric Method
GB/T 223.31, Iron, Steel and Alloy - Determination of Arsenic Content ?€? Distillation Separation-Molybdenum Blue Spectrophotometric Method
GB/T 223.47, Methods for Chemical Analysis of Iron, Steel and Alloy ?€? The Carrier Precipitation-Molybdenum Blue Potometric Method for the Determination of Antimony Content
GB/T 223.50, Methods for Chemical Analysis of Iron, Steel and Alloy ?€? The Phenylfuorone-CTMAB Direct Photometric Method for the Determination of Tin Content
GB/T 223.54, Methods for Chemical Analysis of Iron, Steel and Alloy ?€? The Flame Atomic Absorption Spectrophotometric Method for the Determination of Nickel 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 223.63, Methods for Chemical Analysis of Iron, Steel and Alloy ?€? The Sodium (Potassium) Periodate Photometric Method for the Determination of Manganese Content
GB/T 223.67, Iron, Steel and Alloy ?€? Determination of Sulfur Content ?€? Methylene Blue Spectrophotometric Method
GB/T 223.71, Methods for Chemical Analysis of Iron, Steel and Alloy ?€? The Gravimetric Method after Combustion in the Pipe Furnace for the Determination of Carbon Content
GB/T 223.77, Methods for Chemical Analysis of Iron, Steel and Alloy ?€? The Flame Atomic Absorption Spectrometric Method for the Determination of Calcium Content GB/T 223.84, Iron, Steel and Alloy ?€? Determination of Titanium Content ?€? Diantipyrylmethane Spectrophotometric Method
GB/T 224, Determination of Depth of Decarburization of Steels
GB/T 225, Steel ?€? Hardenability Test by End Quenching (Jominy Test)
GB/T 226, Test Method for Macrostructure and Defect of Steel by Etching GB/T 228.1, Metallic Materials ?€? Tensile Testing ?€? Part 1. Method of Test at Room Temperature
GB/T 229, Metallic Materials ?€? Charpy Pendulum Impact Test Method
GB/T 231.1, Metallic Materials ?€? Brinell Hardness Test ?€? Part 1. Test Method GB/T 702-2008, Hot-rolled Steel Bars ?€? Dimensions, Shape, Weight and Tolerances GB/T 905-1994, Dimension, Shape, Weight and Tolerance for Cold-drawn Round, Square and Hexagonal Steels
GB/T 1979, Standard Diagrams for Macrostructure and Defect of Structural Steels GB/T 2101, General Requirements for Acceptance, Packaging, Marking and
Certification for Section Steel
acceptance as specified in this Standard.
8.1.2 The purchaser can dispatch inspection personnel to the supplier at any time, if necessary. The supplier shall provide necessary facilities for the inspection personnel of the purchaser to ensure steels confirmed for delivery conform to the requirements of this Standard. The inspection personnel of the purchaser shall not disturb the production and operation of the supplier for no reason.
8.2 Grouping rules
Steels shall be tested and accepted by batch. Each batch consists of steels of the same designation, furnace number, processing method, dimension, delivery condition and heat treatment batch.
8.3 Specimen number and specimen location
The specimen number and specimen location of steels shall be as specified in Table 12.
8.4 Retest and evaluation criteria
8.4.1 If any test item among the test items fails to pass (except flakes, non-metallic inclusions and tower hair cracks), test specimens can be taken once again to carry out retest for the defective items, with the same specimen number as that of the initial test (except test for oxygen content), the batch of steels is decided to pass the test if the retest passes; if the retest results still fail to pass, then the batch of steels shall be decided to fail to pass the test.
8.4.2 When oxygen content fails to pass the test, three test specimens can be taken randomly from steels for retest; the mean value of test results shall not be greater than the values specified in standards; it is allowed for one test specimen exceed the values specified in standards, but the value shall not exceed the standard values plus 0.000 3%.
8.4.3 If the test specimens failing to pass initial test exceed one half of test specimens, it indicates that the quality of the batch of steels is poor, so retest is not allowed to ensure the quality of steels to be delivered, but the supplier can carry out treatment and grouping once again to submit test specimens as a new batch for inspection and acceptance.
8.4.4 If the supplier can ensure steels are up to standard, it is allowed to use billets to replace steels and large ones to replace small ones, with regard to the macrostructure and non-metallic inclusions of the same furnace of steels. 8.5 Rounding of numerical values
All test results of steels shall be rounded off by comparing with standard values to the same number of decimal places as that of the values specified in standards; the rules for rounding off shall be as specified in Article 3 in GB/T 8170-2008.

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