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QB/T 4055.2-2011 (QB/T4055.2-2011)

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QB/T 4055.2-2011English90 Add to Cart 0--3 minutes. Auto-delivery. Cermet casings of watches - Part 2: Carbide cermet casings Obsolete

QB/T 4055.2-2011: PDF in English (QBT 4055.2-2011)
QB/T 4055.2-2011
ICS 39.040.10
Classification. Y 11
Reference No.. 32178-2011
Light Industry Standard of the People’s Republic of China
Cermet casings of watches — Part 2. Carbide cermet
Issued on May 18, 2011 Implemented on August 1, 2011
Issued by. Ministry of Industry and Information Technology of the
People's Republic of China
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and Definitions ... 6
4 Requirements ... 6
References and Original Chinese Documents ... 15
QB/T 4055 Cermet Casings of Watches has two parts.
— Part1. Oxide cermet casings;
— Part2. Carbide cermet casings.
This Part is the second part of QB/T 4055.
This Standard is proposed by China National Light Industry Council.
This Standard is under the jurisdiction of National Watch Standardization Center.
This Standard is drafted by organizations. Shenzhen FLYTA Precision Timer
Manufacturing CO.LTD and FLYTA (Group) Holdings LTD.
This Standard is mainly drafted by. Zhang Na, Bao Xianyong, Yan Ming, Cui Xiaolong, and
Guo Feng.
Carbide cermet material is widely used in casings of watches because of its excellent
wear resistance, it has greatly improve the product style and exterior quality of watch
industry of our country. But this material differs from traditional metallic materials, the
quality of this material has great influence in impact resistance and corrosion resistance of
end-product watches, and it may cause skin allergy when wore by some customers.
In order to regulate the use of carbide cermet material in watch industry, and to take the
essence and discard the dregs, it is necessary to make this product standard to unify
technical requirements and marks, to make it rule-based for manufacturers and users, to
improve the quality and market competitiveness of carbide cermet material, to promote
carbide cermet material to be healthily-developed in watch market, and to protect interests
of both manufacturers and consumers.
Cermet casings of watches — Part 2. Carbide cermet casings
1 Scope
This Part specifies technical requirements, testing methods, rules for inspection, packing,
marking, transport and storage of carbide cermet watchcases and watch-bands of
watches (known as casings for short hereafter).
This Standard applies to watch-cases and watch-bands made by carbide cermet material
with tungsten (WC) and titanium (TiC) as main composition. Watch-cases and
watch-bands made by carbide cermet material with other composition can also refer to
this Part.
2 Normative references
The following documents are necessary for the application of this Document. For dated
reference, only dated edition applies to this Document. For undated references, the latest
edition (including all amendments) applies.
GB/T 2828.1 Sampling procedures for inspection by attributes-Part1. Sampling schemes
indexed by acceptance quality limit (AQL) for lot-by-lot inspection (GB/T 2828.1-2003, ISO
2859-1. 1991, IDT)
GB/T 2829 Sampling procedures and tables for periodic inspection by attributes (Apply to
inspection of process stability)
GB/T 3489 Hard metals - Metallographic determination of porosity and uncombined
carbon (GB/T 3489-1983, ISO 4505. 1978, EQV)
GB/T 4028 Timekeeping instruments - Symbolization of control positions (GB/T
4028-1994, ISO 3158. 1976, IDT)
GB/T 6569 Test method for flexural strength of monolithic ceramics (GB/T 6569-2006, ISO
14704. 2000, MOD)
GB/T 7997 Hard metals - Vickers hardness test (GB/T 7997-1987, ISO 3878. 1983, EQV)
GB/T 10700 Test methods for elastic moduli of fine ceramics - Bending method
GB/T 19719 Jewelry - Determination of the release of nickel - Method of spectrometry
(GB/T 19719—2005, EN 1811. 1998, MOD)
A) When the product is discontinued more than one production cycle and is
resumed production.
B) When new product is launched for production or old product transfers
C) When the product design, structure, processes, materials have significant
changes or when the product transfers production.
D) When National Quality Supervision and Inspection agency calls for the type
6.3 Inspection of Nickel release
Nickel release shall be tested according to the predetermined methods in GB/T9719.
7 Marking, Packaging, Transportation, and Storage
7.1 Marking
7.1.1 Marking Requirements
If the exterior parts meet the requirements of Chapter 4, marking shall be conducted
on a suitable location of the product or on the product certification, or on the product’s
instructions for use.
7.1.2 Marking Methods
Marking shall be composed of the code, the type of material and exterior parts of
cermet material as follows.
X2 -- Cermet casing (Indicated by the first letter in English)
X1 -- Cermet type (Represented by the chemical formula of the major component)
C -- Cermet material code
In which.
C. Cermet material code, cermet type of exterior parts shall be represented by C.
X1. Type of Cermet material shall be represented by the chemical formula of the
major component. Commonly used chemical formula of metal carbide cermet
materials are shown in 3.2, 3.3.
X2. Type of cermet casing, in which - "front circle" is represented by a "B" (bezel),
"Watch Case (with front ring-structure containing pre-laps)" is represented by C (case),
"Bracelet" is represented by L (link), and "strap" is represented by W (wristlet).
References and Original Chinese Documents
[1] QB/T 4055.2-2011 Cermet casings of watches. Part 2.Carbide cermet casings.
(Above excerpt was released on 2014-03-17, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/QBT4055.2-2011