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GB/T 3086-2008 English PDF (GBT3086-2008)

GB/T 3086-2008 English PDF (GBT3086-2008)

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GB/T 3086-2008: High carbon chromium stainless bearing steels

This standard specifies the dimensions, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, markings and quality certificates of high carbon chromium stainless bearing steel. This standard applies to hot-rolled, forged, cold-drawn, stripped, and polished round steel with a nominal diameter of 5 mm ~ 160 mm, as well as the steel wire rods with a nominal diameter of 5 mm ~ 40 mm and steel wires with a nominal diameter of 1 mm ~ 16 mm.
GB/T 3086-2008
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.20
H 40
Replacing GB/T 3086-1982
High carbon chromium stainless bearing steels
ISSUED ON. SEPTEMBER 11, 2008
IMPLEMENTED ON. MAY 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Category ... 9
4 Order contents ... 9
5 Size, shape, weight and allowable deviation ... 9
6 Technical requirements ... 10
7 Test methods ... 15
8 Inspection rules ... 16
9 Packaging, markings, and quality certificates ... 17
Appendix A (Normative) High carbon chromium stainless bearing steel standard rating diagram ) ... 18
Appendix B (Normative) A method of testing non-metallic inclusions in steel 31 Foreword
This standard replaces GB/T 3086-1982 ?€?Technical conditions for high carbon chromium stainless bearing steel?€?.
As compared with the original standard, the main changes of this standard are as follows.
- EXPEND the nominal diameter range of steel from 1.4 mm ~ 120 mm to 1
mm ~ 160 mm (clause 2 of the 1982 version; clause 1 of this version);
- MODIFY the ?€?classification?€? that it is classified in accordance with the steel processing methods and delivery status in the original standard into that it is classified in accordance with the method of use and processing (clause 1 of the 1982 version; clause 3 of this version);
- ADD ?€?Normative references?€? and ?€?Ordering contents?€? (see clauses 2 and 4);
- ADD the provisions for the size, shape, and allowable deviations of hot- rolled wire rods, stripped steels, and polished steels; MODIFY that the wire size, shape, and allowable deviations are in accordance with YB 245-64 to that it is in accordance with the requirements of Table 3 of GB/T 342-1997. (2.1 of the 1982 version; 5.1 of this version);
- CANCEL the provisions for the length of steel, CHANGE it to making
reference to the size and shape standards of the corresponding varieties (2.2 in 1982 version; 5.1 in this version);
- The new brand representation and unified digital codes are in accordance with the provisions of GB/T 1220-2007 and GB/T 17616, ADD the
65Cr14Mo brand number and related requirements (Table 4 of the 1982
version, Table 3 of this version);
- MODIFY the chemical composition of the chromium element from one digit after the decimal point two digits after the decimal point. MODIFY the
allowable deviation of the chemical composition of the steel from the
specified Cr and Mo to the implementation of the provisions of GB/T 222 (Table 4 and 3.1.2 of the 1982 version; Table 3 and 6.1.2 of this version); - ADD the delivery status of the annealed peeling, MODIFY the ?€?cold grinding?€? of the original standard into ?€?polishing?€? (3.3 of 1982 version; 6.3 of this version);
- CANCEL the provisions on the ?€?indentation diameter?€? (3.4.1 of the 1982 version; 6.4.1 of this version);
- WIDEN the Brinell hardness range of the annealed steel from 197 HB ~
241 HB to 197 HBW ~ 255 HBW, WIDEN the tensile strength range from
590 N/mm2 ~ 785 N/mm2 to 590 N/mm2 ~ 835 N/mm2 (3.4 of the 1982
version; 6.4.1 and 6.4.2 of this version);
- ADD the mechanical properties of polished steels, which allows compared annealing fluctuation +10% (see 6.4.3);
- ADD that the size of the tower-shaped specimen with a nominal diameter greater than 150 mm round bar can be performed in accordance with the
corresponding ratio of GB/T 15711 (3.6.3 in 1982 version; 6.6.3 in this version);
- MODIFY the ?€?twin carbides?€? into ?€?twin crystal carbides?€? (3.7 in 1982 version; 6.7 of this version);
- ADD the requirements that the non-uniformity of eutectic carbides with a nominal diameter of more than 120 mm is to be as specified by the
agreement between the supplier and the purchaser (Table 8 of the 1982
version; Table 5 of this version);
- For the inspection of non-metallic inclusions, ADD the implementation of the inspection requirements in accordance with GB/T10561-2005,
CHANGE the original standard inspection requirements into agreement
requirements and PLACE them in Appendix B (3.9 in 1982 version; 6.9 and Appendix B in this version);
- For the microscopic pore inspection, ADD the 10x magnification inspection of the polished surface of longitudinal specimens after quenching (3.10 of the 1982 version; 6.10 of this version);
- ADD the provisions that the depth of the decarburized layer with a nominal diameter greater than 120 mm shall be as specified between the supplier and the purchaser (Table 10 of the 1982 version; Table 7 of this version); - ADD the surface quality requirements of hot-rolled wire rods. For the surface defect depth requirements of the cold-rolled steels, ADD that it is calculated from the actual size, ADD the surface quality requirements of the peeled material, MODIFY the surface quality of polished round steel and polished wire to follow the requirements of GB/T3207 (3.12 in 1982 version; 6.12 in this version);
- MODIFY the rules on the sampling quantity, DEFINE the number of
samples taken from the batching of parent-furnace and batching of
electroslag furnaces (Table 12 of the 1982 version; Table 10 of this version); - MODIFY the re-inspection and determination rules (5.4 of 1982 version; 8.4 High carbon chromium stainless bearing steels
1 Scope
This standard specifies the dimensions, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, markings and quality certificates of high carbon chromium stainless bearing steel. This standard applies to hot-rolled, forged, cold-drawn, stripped, and polished round steel with a nominal diameter of 5 mm ~ 160 mm, as well as the steel wire rods with a nominal diameter of 5 mm ~ 40 mm and steel wires with a nominal diameter of 1 mm ~ 16 mm.
2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. 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 phosphomolybdic acid gravimetric method for the
determination of phosphorus content
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method (GB/T 223.5-2008, ISO 4829-1.1986 and ISO 4829-2.1986, MOD)
GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method (GB/T 223.11-2008, ISO 4937.1986, MOD)
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation iodimetric 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 223.58 Methods for chemical analysis of steels and alloys -
Determination of manganese content by sodium Arsenite-sodium nitrite
titrimetric method
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 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of
phosphorus content
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) sodium periodate photometric method for the
determination of manganese content (GB/T 223.63-1998, neq ISO R629)
GB/T 223.67 Iron, steel and alloy - Determination of sulfur content -
Methylene blue spectrophotometric method
GB/T 223.68 Methods for chemical analysis of iron steel and alloy - The combustion potassium iodate volumetric method for the determination of
sulfur content
GB/T 223.69 Iron, steel and alloy - Determination of carbon contents - Gas- volumetric method after combustion in the pipe furnace
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 Determination of depth of decarburization of steels
GB/T 226 Test method for macrostructure and defect of steel by etching
(GB/T 226-1991, neq ISO 4969.1980, Steel-Mac-rendering examination by
etching with strong mineral acids)
GB/T 228 Metallic materials - Tensile testing at ambient temperature (GB/T 228-2002, eqv ISO 6892.1998)
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1. Test method (GB/T 231.1-2002, eqv ISO 6506-1.1999)
GB/T 342-1997 Dimension shape mass and tolerance for cold-drawn round
square and hexagonal steel wires
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 908-2008 Abandoned fluorescent lamps recycling and reuse -
Technical specification
GB/T 1814 Inspection method for steel work fractures
GB/T 2101 General requirement of acceptance packaging marking and
certification for section steel
GB/T 2103 General requirements for acceptance, packing, marking and
quality certification of steel wire
GB/T 2975 Steel and steel products - Location and preparation of test pieces for mechanical testing (GB/T 2975-1998, eqv ISO 377.1997)
GB/T 3207-2008 Bright steel
GB/T 10121 Steel products - Method for magnetic particle inspection of
tower sample
GB/T 10561 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams (GB/T 10561-2005, ISO
4967.1998, IDT)
GB/T 11170 Stainless steel - Determination of multi-element contents -
Spark discharge atomic emission spectrometric method (Routine method)
GB/T 13298 Inspection methods of microstructure for metals
GB/T 14981-2004 Dimensions, shape, mass and tolerances for hot-rolled
wire rods
GB/T 14979-1994 Eutectic carbide of steel - Micrographic method using
Standard diagrams
GB/T 15711 Steel products - Method for etch test of tower sample
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition (GB/T 20066-2006, ISO 14284.1996, IDT)
Electroslag steel is batched based on electroslag furnace number. When the electroslag process is stable and can ensure compliance with the technical requirements of this standard, it is allowed to batch in accordance with the consumable electrode parent-furnace number. However, the supplier shall provide the chemical composition data in accordance with the electroslag furnace number and indicate the electroslag furnace number on the steel. 8.3 Sampling location and sampling quantity
The sampling locations and sampling quantities for each batch of steel
inspection shall comply with the requirements of Table 10. Non-metallic inclusions are sampled in batches of the parent-furnace number.
8.4 Retest and determination rules
8.4.1 When the chemical composition of the steel is unqualified, it is allowed to re-sample the same steel for retest. If the retest result is still unqualified, the steel from this furnace is judged as unqualified.
8.4.2 When a certain test item of a non-metallic inclusions fails, the batch of steel is judged as unqualified. However, when any one item of the mechanical properties, hardness, forging, macrostructure, tower shape, annealed structure, eutectic carbide non-uniformity, microscopic pores, and decarburization layer fails in the inspection, it is allowed for the supplier to treat it again, and submit it as a new batch for inspection and acceptance.
8.4.3 When the size, shape and appearance quality of a steel product fail to pass the inspection, it shall be judged as unqualified. For steels with unqualified sizes, shape and appearance quality, they can be reworked, straightened or ground again for retest, and delivered after passing inspection.
8.4.4 If the supplier can ensure that the steel?€?s macrostructure and non-metallic inclusions are qualified, it is allowed to use the blank to replace material, and to use large sized steel to replace small sized steel.
9 Packaging, markings, and quality certificates
9.1 The packaging, marking and quality certificates of round bars and wire rods shall comply with the relevant provisions of GB/T 2101.
9.2 The steel wire packing, marking and quality certificate shall comply with the relevant provisions of GB/T 2103.

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