GB/T 4461-2020 PDF English
US$320.00 · In stock · Download in 9 secondsGB/T 4461-2020: Thermostat metal strip Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 4461: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 4461-2020 | English | 320 |
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Thermostat metal strip
| Valid |
| GB/T 4461-2007 | English | 599 |
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3 days
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Thermostat bimetal strip
| Obsolete |
| GB/T 4461-1992 | English | 519 |
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4 days
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Thermostat metal strip
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 4461-2020
GB/T 4461-2020: Thermostat metal strip---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4461-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.99
H 58
Replacing GB/T 4461-2007
Thermostat metal strip
Issued on. JUNE 02, 2020
Implemented on. DECEMBER 01, 2020
Issued by. State Administration for Market Regulation;
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... 5
4 Designation representation method... 8
5 Order content... 9
6 Size and shape... 9
7 Marks... 10
8 Technical requirements... 10
8 Surface quality... 17
9 Test methods... 17
10 Inspection rules... 20
11 Packaging, signs and quality certificate... 21
Annex A (informative) Chemical composition of thermostat metal component
alloy... 22
Annex B (informative) Average linear thermal expansion coefficient and
resistivity of thermostat metal component alloy... 25
Annex C (informative) Recommended heat treatment system... 26
Bibliography... 28
1 Scope
This Standard specifies the designation expression method, order content, size,
shape, marks, technical requirements, test methods, inspection rules,
packaging, signs and quality certificate for thermostat metal strip.
This Standard is applicable to the production of t thermostat metal strip
(hereinafter referred to as the strip) for thermal sensitive components in
temperature control, temperature compensation and temperature indicating
devices.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 5986, Test method for modulus of elasticity of thermostat metals
GB/T 6146, Test method for resistivity of precision resistance alloys
GB/T 8364, Test methods of thermal flexure of thermostat metals
YB/T 5242, General Rules of Packaging, Marking and Quality Certification
for Precision Alloys
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 thermostat metal
A composite material for heat-sensitive elements that is composed of two or
more layers of metals or alloys with different average linear thermal expansion
coefficients that are firmly bonded along the entire contact surface.
3.2 component alloy
The collective name of the material layers that make up the thermostat metal.
According to the characteristics and functions of the material layer, it is divided
into active component of thermostat metal, passive component of thermostat
metal, intermediate passive component of thermostat metal.
3.2.1 active component of thermostat metal
A component layer with a larger average linear thermal expansion coefficient in
a thermostat metal.
3.3 specific thermal deflection
For flat thermostat metal with unit thickness, when the temperature changes by
1°C, half of the curvature change along the longitudinal centerline.
The expression for specific thermal deflection K is.
4 Designation representation method
The designations for thermostat metal are expressed by the combination of the
Arabic numeral "5", the Chinese pinyin letter "J" (the first letter of the Chinese
pinyin "Jing"), the flexivity and the resistivity value.
5 Order content
The contract or order for ordering according to this Standard shall at least
include the following contents.
6 Size and shape
6.1 Size and tolerance
The strip size and its tolerance shall meet the requirements of Table 1.The
fixed-length supply shall be indicated in the contract.
6.2 Shape
6.2.1 The components of the strip shall be firmly bonded between layers. There
shall be no delamination and edge cracks.
6.2.2 The strip shall not be severely twisted.
6.2.3 The sickle bend per meter of the strip shall be no more than 3mm.
6.2.4 The longitudinal and transverse radii of curvature of the strip shall meet
the requirements of Table 2.
7 Marks
The passive component of thermostat metal strip shall have continuous marks
corresponding to the designation.
8 Technical requirements
8.1 Designation, component layer and characteristics
8.1.1 See Table 3 for the designation of thermostat metal, component layer alloy
designation and the main characteristics of thermostat metal.
8.3 Performance
8.3.1 The flexivity of the strip specimen after heat treatment shall meet the
requirements of Table 4.Refer to Annex C for the recommended heat treatment
system. The tolerance level of t flexivity (I or II) shall be indicated in the contract.
8.3.2 The resistivity and bonding strength of the strip shall meet the
requirements in Table 4.The bonding strength test (I or II) shall be determined
by the supplier and the purchaser through negotiation to choose one.
8.3.3 Required by the purchaser and indicated in the contract, it can measure
the elastic modulus of strip specimen after heat treatment. Its elastic modulus
8.3.4 Required by the purchaser, agreed by the supplier and the purchaser and
indicated in the contract, the strips with properties other than those specified in
Table 4 can be supplied.
8 Surface quality
The strip surface shall be smooth. Cracks, bubbles, flaking, rust spots, severe
scratches and harmful spots are not allowed.
9 Test methods
9.1 Size, shape
The size and shape of the strip are checked with measuring tools that can meet
the accuracy requirements.
9.2 Flexivity
The flexivity test and specimen preparation are carried out in accordance with
the provisions of GB/T 8364.Refer to Annex C for the heat treatment system of
the specimen.
9.5 Bonding strength
9.5.1 Test method I
Test method I is repeated bending test (see Figure 1). The specimen size is
shown in Table 6.Repeatedly bend to break. Visually observe the state of the
bonding site.
9.5.2 Test method II
10 Inspection rules
10.1 Inspection and acceptance
The quality inspection and acceptance of the strip is carried out by the supplier's
quality supervision department.
10.2 Batching rules
The strip shall be submitted in batches for inspection and acceptance. Each
batch shall be composed of thermostat metal strips of the same designation,
the same heat number, the same size and the same delivery state.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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