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YB/T 4146-2016 (YB/T4146-2016)

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YB/T 4146-2016: PDF in English (YBT 4146-2016)
YB/T 4146-2016
FERROUS METALLURGICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Replacing YB/T 4146-2006
High-carbon chromium bearing steel
seamless steel tubes
ISSUED ON: OCTOBER 22, 2016
IMPLEMENTED ON: APRIL 01, 2017
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Order content ... 6 
4 Size, shape, weight ... 7 
5 Technical requirements ... 9 
6 Test methods ... 12 
7 Inspection rules ... 14 
8 Packaging, marking and quality certificate ... 15 
High-carbon chromium bearing steel
seamless steel tubes
1 Scope
This standard specifies the order content, size, shape, weight, technical
requirements, test methods, inspection rules, packaging, marking and quality
certificate of high carbon-chromium bearing steel seamless steel tube.
This standard applies to the hot-rolled and cold-drawn (rolling) high-carbon
chromium bearing steel seamless steel tube (hereinafter referred to as steel
tube) which is used to manufacture the rolling bearing parts and other
mechanical parts.
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 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 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 223.19 Methods for chemical analysis of iron, steel and alloy - The
neocuproine-chloroform extraction photometric method for the
determination of copper content
GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The
dimethylglyoxime spectrophotometric method
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-molybdenum blue spectrophotometric method
GB/T 223.47 Methods for chemical analysis of iron, steel and alloy - The
carrier precipitation-molybdenum blue photometric method for the
determination of antimony content
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 223.58 Methods for chemical analysis of iron, steel and alloy - The
sodium arsenite-sodium nitrite titrimetric method for the determination of
manganese 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 223.71 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 223.72 Iron, steel and alloy - Determination of sulfur content.
Gravimetric method
GB/T 224 Iron, steel and alloy - Determination of sulfur content. Gravimetric
method
GB/T 226 Test method for macrostructure and defect of steel by etching
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 1979 Standard diagrams for macrostructure and defect of structural
steels
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 4336-2002 Standard test method for spark discharge atomic emission
spectrometric analysis of carbon and low-alloy steel (routine method)
GB/T 5777-2008 Seamless steel pipe and tubing methods for ultrasonic
testing
steel tubes of the fixed-length. The fixed-length is generally within the range of
the normal length. The allowable deviation of length is .
4.4 Curvature
The curvature of the steel tube shall not exceed the following provisions:
a) When the wall thickness is S ≤ 15 mm, 1.0 mm/m;
b) When the wall thickness is S > 15 mm, 1.5 mm/m.
4.5 Out-of-roundness and nonuniformity of wall thickness
The out-of-roundness of the steel tube shall not exceed 60% of the tolerance of
outer diameter as specified in Table 1. The nonuniformity of wall thickness of
the steel tube shall not exceed 80% of the tolerance of wall thickness as
specified in Table 1.
4.6 Shape of tip
4.6.1 The end faces of the steel tube shall be perpendicular to the axis of the
steel tube. The burrs at the incision shall be removed.
4.6.2 According to the requirements of the purchaser, through negotiation
between the supplier and the purchaser, one or both ends of the steel tube may
be chamfered. The specific requirements for chamfering are indicated in the
contract.
4.7 Delivery weight
Steel tubes are delivered in actual weight.
5 Technical requirements
5.1 Designation and chemical composition of steel
5.1.1 The designation and chemical composition (melting composition) of the
steel, the content of residual elements in the steel, the allowable deviation of
the finished product’s composition shall comply with the requirements for
G8Cr15, GCr15, GCr15SiMn, GCr15SiMo, GCr18Mo in Tables 4 ~ 6 of GB/T
18254-2016, respectively.
5.1.2 According to the requirements of the purchaser, the supplier may provide
the content of restricted substances such as lead, cadmium, hexavalent
chromium, mercury, polybrominated biphenyls, polybrominated diphenyl ethers.
5.5 Macrostructure
The steel tube shall be subjected to acid-leached macrostructure inspection.
On the acid-leached test piece of its cross-section, it does not allow white spots,
inclusions, underlaying bubbles, cracks, stratification.
5.6 Microstructure
The steel tube shall be subjected to a microstructure inspection. After the
spheroidized annealing, the microstructure of the steel tube shall be fine-
grained pearlite. The microstructure shall be graded according to the grade 5
chart in Appendix A of GB/T 18254-2016, the qualification grade shall be grade
2 ~ grade 4.
5.7 Carbide inhomogeneity
Steel tubes shall be subjected to carbide inhomogeneity inspection. After the
spheroidized annealing of steel tubes, it does not allow severe carbide
segregation. Carbide segregation shall be graded according to the grades 6, 8,
9 rating chart in Appendix A of GB/T 18254-2016. The specific grades shall meet
the following requirements:
a) For steel tubes which have a wall thickness of not more than 15 mm, the
carbide mesh shall be not more than grade 2.5. For steel tubes which have
a wall thickness greater than 15 mm, the carbide mesh shall be
determined by both parties through negotiation;
b) The carbide ribbon shall be not more than grade 2;
c) The carbide liquefaction shall be not more than grade 0.5.
5.8 Non-metallic inclusions
The steel tube shall be subjected to the inspection of non-metallic inclusions.
The qualification grade shall comply with the provisions of 6.8 of GB/T 18254-
2016.
5.9 Decarburization layer
5.9.1 The depth of the total decarburization layer on the inner and outer
surfaces of the hot-rolled steel tube shall not exceed 0.50 mm.
5.9.2 The depth of the total decarburization layer on the inner and outer
surfaces of the cold-drawn (rolled) steel tube shall not exceed 0.20 mm.
5.9.3 For the steel tubes which are delivered in peeled or polished states, it
does not allow the outer surface to have a decarburized layer; the decarburized
layer on the inner surface shall comply with the provisions of 5.9.1.
......
 
(Above excerpt was released on 2014-04-20, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/YBT4146-2016