GB/T 8263-2010 PDF in English
GB/T 8263-2010 (GB/T8263-2010, GBT 8263-2010, GBT8263-2010)
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| GB/T 8263-2010 | English | 75 |
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Abrasion-resistant white iron castings
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| GB/T 8263-1999 | English | 359 |
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Abrasion-resistant white iron castings
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| GB/T 8263-1987 | English | RFQ |
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Specification for abrasion resistant white cast irons
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Standards related to (historical): GB/T 8263-2010
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GB/T 8263-2010: PDF in English (GBT 8263-2010) GB/T 8263-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.80
J 31
Replacing GB/T 8263-1999
Abrasion-resistant white iron castings
ISSUED ON: DECEMBER 23, 2010
IMPLEMENTED ON: JUNE 01, 2011
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 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Designations ... 6
5 Technical requirements ... 7
6 Test methods ... 9
7 Inspection rules ... 9
8 Marks, storage, packaging and transportation ... 12
Annex A (informative) Specifications for heat treatment of abrasion-resistant white iron
castings ... 13
Annex B (informative) Metallographic structure of abrasion-resistant white iron
castings ... 14
Abrasion-resistant white iron castings
1 Scope
This Standard specifies terms and definitions, designations, technical requirements, test
methods, inspection rules, marks, storage, packaging and transportation of abrasion-
resistant white iron castings with Cr and Ni and abrasion-resistant white iron castings
with Cr.
This Standard applies to abrasion-resistant parts in metallurgy, building materials,
electric power, construction, shipbuilding, coal, chemical and machinery industries.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments (excluding
corrigendum) 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 223.11, Iron, steel and alloy -- Determination of chromium content -- Visual
titration or potentiometric titration method
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 223.23, 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 223.59, Iron, steel and alloy -- Determination of phosphorus content --
Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
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 223.64, Iron, steel and alloy -- Determination of manganese content -- Flame
atomic absorption spectrometric method
GB/T 223.67, Iron, steel and alloy -- Determination of sulfur content -- Methylene
blue spectrophotometric method
GB/T 223.69, Iron, steel and alloy -- Determination of carbon contents -- Gas-
volumetric method after combustion in the pipe furnace
GB/T 230.1, Metallic materials -- Rockwell hardness test -- Part 1: Test method
GB/T 231.1, Metallic materials -- Brinell hardness test -- Part 1: Test method
GB/T 5611, Foundry terminology
GB/T 5612, Code for representing cast iron
GB/T 6060.1-1997, Roughness comparison specimens. Cast surfaces
GB/T 6414-1999, Castings. System of dimensional tolerances and machining
allowances
GB/T 11351-1989, Mass tolerances for castings
GB/T 15056, Casting surface roughness -- Appraising method
GB/T 20066, Steel and iron -- Sampling and preparation of samples for the
determination of chemical composition
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 5611 as
well as the followings apply.
3.1 abrasion-resistant white iron
White iron that the metallographic structure is a metal matrix plus carbides, and has
good wear resistance.
3.2 abrasion-resistant white iron with Cr and Ni
Abrasion-resistant white cast iron with nickel and chromium as the main alloy elements.
3.3 abrasion-resistant white iron with Cr
Abrasion-resistant white cast iron with chromium as the main alloying element.
4 Designations
According to the chemical composition of abrasion-resistant white iron, 10 designations
supplier and purchaser.
5.6.3 The surface roughness of castings shall comply with the specifications in the
drawing or order contract. If there is no stipulation in the drawing or order contract, the
surface roughness of the casting shall meet the requirements of level Ra25 in GB/T
6060.1-1997.
5.7 Dimensional and weight tolerances
The geometry, dimensions, weight and deviations of the castings shall comply with the
drawings or ordering contract. If there is no stipulation in the drawing and order contract,
the dimensional deviation of castings shall meet the requirements of level CT11 in
GB/T 6414-1999; the weight deviation of castings shall meet the requirements of level
MT11 in GB/T 11351-1989.
5.8 Defect cleaning
During the cleaning and treatment of casting defects in castings, flame cutting, arc
gouging cutting, electric welding cutting and welding repair are not allowed.
6 Test methods
6.1 The analysis method of chemical composition shall be in accordance with GB/T
223.69, GB/T 223.60, GB/T 223.64, GB/T 223.11, GB/T 223.26, GB/T 223.23, GB/T
223.18, GB/T 223.67, GB/T 223.59. Modern instrumental analysis methods such as
spectroscopic analysis can also be used.
6.2 Rockwell hardness test is carried out in accordance with GB/T 230.1. Brinell
hardness test is carried out in accordance with GB/T 231.1.
6.3 Surface roughness inspection methods are carried out in accordance with GB/T
6060.1 and GB/T 15056
6.4 For casting geometric shape and dimensional inspection, inspection tools, gauge
blocks, templates or scribing inspection with corresponding accuracy shall be selected.
7 Inspection rules
7.1 Inspection location and time
7.1.1 The inspection location shall be agreed upon by both parties. Inspection shall
generally be carried out on the supplier's location. Inspection samples can be selected
at the supplier's factory.
7.1.2 According to the agreement between the two parties, the supplier and the
purchaser agree on the inspection date. During inspection at the supplier's location, if
the purchaser's representative does not arrive at the agreed time, in order to avoid
interruption of the manufacturing cycle, the supplier may conduct its own inspection
and submit the inspection results to the demander, unless expressly prohibited.
7.2 Inspection rights and responsibilities
7.2.1 Inspection of castings and specimens is generally carried out by the supplier's
inspection department.
7.2.2 When the supplier does not have the necessary inspection means, or when there
is a dispute between the supplier and the purchaser about the quality of the casting, the
inspection can be conducted by a third-party independent agency.
7.2.3 Representatives of the purchaser have the right to enter the location where castings,
test blocks, and specimens to be inspected are manufactured and stored, and may
designate samples to be selected in accordance with regulations. They have the right to
participate in sample selection and preparation and inspection of castings, test blocks,
specimens, but shall not interfere with the supplier's work procedures. Supplier's safety
procedures shall be followed. Be accompanied by supplier representatives whenever
possible. At the same time, the supplier's intellectual property rights shall be respected
and the supplier's technical secrets shall be kept confidential.
7.3 Division of inspection lots
Inspection lots are divided into the following three types. Specific requirements shall
be agreed upon by both supply and demand parties.
7.3.1 Batch by heat: Castings of the same type, poured from the same heat, and
subjected to the same heat treatment in the same furnace are considered a batch.
7.3.2 Batch by quantity or weight: Castings of the same designation cast in multiple
heats under the condition of stable smelting process and heat treated by the same
process in multiple heats are classified into a batch with a certain number or weight of
castings.
7.3.3 Batch by piece: It refers to certain castings that have special technical
requirements, with one or several pieces as a batch.
7.4 Chemical composition inspection
7.4.1 When smelting in an electric furnace, each furnace is considered a batch. When
cupola furnace is used for smelting, every 2 h is considered as a batch. Take one
specimen from each batch for chemical composition inspection. The sampling and
preparation methods of specimens for chemical composition determination shall be
carried out in accordance with the provisions of GB/T 20066. When taking chips, they
shall be taken below 6 mm from the casting surface.
7.4.2 If the chemical composition test result is unqualified, double sampling and
retesting will be required. If there is still one sample that is unqualified, the batch of
castings will be unqualified.
7.5 Hardness inspection
7.5.1 Hardness inspection is performed on a batch-by-batch basis. Randomly select 3
pieces (or 3 test blocks) from each batch for inspection. If one piece fails, the same
number of castings (test blocks) can be randomly selected for re-inspection. When the
number of unqualified castings (test blocks) sampled twice is greater than or equal to 2,
the batch of castings is deemed unqualified. If 2 pieces (test blocks) are unqualified in
the first sampling, the batch of castings will be deemed unqualified. When batching by
piece, the sampling method shall be agreed upon by both parties.
7.5.2 Surface hardness shall be tested 2 mm~3 mm below the casting surface. The
surface hardness test site is selected from the main wear site of the casting. When it is
difficult to test the hardness on the casting body, the surface hardness can also be tested
on the cast test block attached to the casting body. The attached cast test block shall not
be separated from the casting body before completing any required heat treatment. If
the purchaser does not put forward special requirements, the location and size of the
attached cast test block shall be determined by the supplier. The sampling and
inspection method for testing the hardness at 40% of the casting section depth is
determined by the supplier. The hardness test surface must be produced by machining,
wire cutting or EDM technology, but the wire cutting or EDM machined surface must
also be machined to remove the heat affected zone.
7.5.3 When the hardness test of heat-treated castings fails, the batch of castings and test
blocks are allowed to be heat-treated again. Then carry out the hardness test required
by the standard. If the hardness test passes after re-heat treatment, the batch of castings
is still qualified. However, without the consent of the purchaser, it is not allowed to
reheat the castings and test blocks more than twice (except for stress relief heat
treatment).
7.6 Surface quality inspection
The surface quality of castings shall be inspected piece by piece in accordance with the
requirements of 5.6.
7.7 Dimension and weight inspection
The size and weight deviation of castings can be inspected piece by piece according to
the requirements of 5.7 or randomly inspected according to the method agreed between
the supplier and the purchaser.
7.8 Rounding of test results
The test results of chemical composition and hardness can be revised according to the
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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