GB/T 12225-2018 English PDF (GBT12225-2018)

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GB/T 12225-2018: General purpose industrial valves -- Specification of copper alloy castings
GB/T 12225-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.060.01
J 16
Replacing GB/T 12225-2005
General Purpose Industrial Valves -
Specification of Copper Alloy Castings
ISSUED ON. MAY 14, 2018
IMPLEMENTED ON. DECEMBER 1, 2018
Issued by. State Administration for Market Regulation;
Standardization Administration Committee of the People’s
Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Casting Classification ... 4 
4 Nameplate, Marking Method and Code of Castings ... 5 
5 Technical Requirements ... 6 
6 Test Methods and Inspection Rules ... 11 
7 Marking, Packaging, Transportation and Storage ... 12 
Foreword
This Standard is drafted in accordance with stipulations in GB/T 1.1-2009.
This Standard serves as a replacement of GB/T 12225-2005 General Purpose
Industrial Valves - Specification of Copper Alloy Castings. In comparison with GB/T
12225-2005, there are several main technical changes as follows.
---Copper alloy nameplates ZCuZn31Al2 and ZCuAl9Fe4Ni4Mn2 are added;
---In mechanical properties, Brinell hardness complies with a new method of
representation;
---The illustration of sample for tensile test is modified in accordance with GB/T
228.1;
---The marking of castings is modified in accordance with GB/T 12220.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee (188) on
Valves of Standardization Administration of China (SAC/TC 188).
The responsible drafting organizations of this Standard. Hefei General Machinery
Research Institute, Ningbo AMICO Copper Valves Manufacturing INC., Zhejiang
WANDEKAI Fluid Equipment Science and Technology Co., Ltd., Zhejiang DunAn Valve
Applications Co., Ltd., KAIRUITE Valve Co., Ltd.
The participating drafting organizations of this Standard. Taizhou DUOHE Machinery
Co., Ltd., YORHE Fluid Intelligent Control Co., Ltd., Zhejiang SUMING Valves Co., Ltd.,
Zhejiang VALOGIN Technology Co., Ltd., Taizhou NENG SHI HVAC Technology Co.,
Ltd., Yuhuan Xiuhui Valves Co., Ltd., Boteli Valve Group, Hefei Tongyong
Environmental Control Technology Limited Liabiity Company.
The main drafters of this Standard. Zhang Jiwei, Zheng Xuezhen, Zhazhao, Ding
Chunlan, Li Yunlong, Yao Shengyong, Su Zongyao, Zhang Yinzong, Chen Weifeng,
Liu Wenxiu, Jin Keyu, Hu Chunyan.
The release of previous versions of the standard replaced by this Standard is as follows.
---GB/T 12225-1989, GB/T 12225-2005.
General Purpose Industrial Valves -
Specification of Copper Alloy Castings
1 Scope
This Standard specifies the classification, nameplate, marking method and code,
technical requirements, test methods, inspection rules, marking, packaging,
transportation and storage of copper alloy castings.
This Standard is applicable to valves of sand casting and metal casting (non-pressure
casting) and copper alloy castings of pipe fittings (hereinafter referred to as castings).
2 Normative References
The following documents are indispensable to the application of this Standard. In terms
of references with a specified date, only versions with a specified date are applicable
to this Standard. The latest version (including all the modifications) of references
without a specified date is also applicable to this Standard.
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1. Method of Test at Room
Temperature
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1. Test Method
GB/T 1176 Casting Copper and Copper Alloys
GB/T 6414 Castings - Dimensional Tolerances and Geometrical Tolerances and
Machining Allowances
GB/T 11351 Mass Tolerances of Casting
GB/T 13927 Pressure Testing for General Purpose Valves
3 Casting Classification
Castings shall be divided into four grades. Please refer to Table 1 for the grade
classification and assessment requirement.
Table 1 -- Casting Assessment Requirement
Casting Grade Assessment Requirement
I Chemical composition, mechanical properties
II Mechanical properties
welding or other methods. However, they shall comply with the drawings or the
stipulation in the contract of ordering. The pressure-containing parts shall satisfy the
test requirement of the shell body.
6 Test Methods and Inspection Rules
6.1 Chemical Composition
6.1.1 The determination of chemical composition of castings shall comply with the
stipulation in GB/T 1176. However, on the premise of guaranteeing the accuracy, other
methods that are approved by the demand side and the supply side are also allowed
to be adopted for determination.
6.1.2 The same time of processing the same type of products shall be deemed as one
shift; the quantity of the same type of products that are completed through successive
processing shall be deemed as one batch. In terms of Grade-I and Grade-III castings,
the main chemical composition and impurity content of materials shall be tested in
accordance with each smelting furnace number. However, under the circumstance
where the raw materials and technologies are stable, products are allowed to be tested
in accordance with the shift or batch. However, there shall be test pieces for
retrospective inspection. Products can also be tested in accordance with the
requirements in the contract of ordering based on the negotiation between the demand
side and the supply side; the result of analysis shall comply with the stipulation in Table
3 and Table 4.
6.1.3 In terms of Grade-I and Grade-III castings, when the materials are deemed as
unqualified in the first determination of chemical composition, they are allowed to be
re-sampled and re-tested. If the materials are still unqualified, the chemical
composition of this furnace (batch) of castings shall be deemed as unqualified.
6.2 Mechanical Properties
6.2.1 The mechanical properties of alloy of Grade-I and Grade-II castings shall be
tested in accordance with each smelting furnace number. However, under the
circumstance where the raw materials and technologies are stable, products are
allowed to be tested in accordance with the shift or batch. In addition, products can
also be tested in accordance with the requirements in the contract of ordering based
on the negotiation between the demand side and the supply side.
6.2.2 The tensile test shall be conducted in accordance with the stipulation in GB/T
228.1. Its result shall comply with the stipulation in Table 5.
6.2.3 The hardness test shall adopt the method that is stipulated in GB/T 231.1. Its
result shall comply with the stipulation in Table 5.
6.2.4 Take 1 test piece from each furnace number (batch) for test; when it is qualified,
the mechanical properties of the materials of this furnace number (batch) of castings
shall be qualified; when it is unqualified, take another 2 test pieces for test. If both of
the 2 test pieces are qualified, then, this furnace number (batch) of castings have
qualified mechanical properties.
6.2.5 When casting materials are unqualified in the mechanical properties, it is
allowable to conduct thermal treatment on the castings and the test pieces (test bars)
and conduct the test again in accordance with the stipulation in 6.2.4. Re-thermal
treatment cannot be conducted for over two times.
6.2.6 When separated test piece is unqualified, take a sample from the casting body
and re-test in accordance with the stipulation in 6.2.4.
6.2.7 When it i...