GB/T 4461-2020Thermostat metal strip (English PDF)

GB/T 4461-2020 is the English-translated version of 热双金属带材.

GB/T 4461-2020 specifies the designation representation method, order content, size, shape, marks, technical requirements, test methods, inspection rules and the packaging, signs and quality certificate for thermostat metal strip.

Clause 1 states that it applies to the production of thermostat metal strip, called the strip in the text, for the thermal sensitive components of temperature control, temperature compensation and temperature indicating devices.

Clause 3 defines thermostat metal as a composite material for heat-sensitive elements composed of two or more layers of metals or alloys with different average linear thermal expansion coefficients firmly bonded along the entire contact surface, and goes on to define the component alloy with its active, passive and intermediate passive forms, and the specific thermal deflection.

The designation clause builds the designation from the Arabic numeral 5, the Chinese pinyin letter J, the flexivity and the resistivity value; the size and shape clause ties sizes and tolerances to Table 1 and requires the layers to be firmly bonded with no delamination or edge cracks, no severe twisting, a sickle bend of no more than 3 mm per metre and longitudinal and transverse radii of curvature to Table 2; the marks clause requires the passive component of the strip to carry continuous marks corresponding to the designation.

The technical requirements clause ties the designation, the component layer alloys and the main characteristics to Table 3 and the flexivity, resistivity and bonding strength of the heat-treated specimen to Table 4, with the flexivity tolerance level and the choice between the two bonding strength tests to be stated in the contract, while a separate surface quality clause, which the table of contents numbers 8 a second time, requires a smooth surface free of cracks, bubbles, flaking, rust spots, severe scratches and harmful spots.

The test methods clause checks size and shape with measuring tools of adequate accuracy, runs the flexivity test and specimen preparation in accordance with GB/T 8364 and gives two bonding strength tests, the first a repeated bending test to break with visual observation of the bonding site, and the inspection rules clause puts inspection and acceptance with the supplier's quality supervision department and requires each batch to be of one designation, heat number, size and delivery state.

Clause 2 cites GB/T 5986, GB/T 6146, GB/T 8364 and YB/T 5242, and three informative annexes give the chemical composition of the thermostat metal component alloys, their average linear thermal expansion coefficient and resistivity, and a recommended heat treatment system.

It replaces GB/T 4461-2007, was issued on 2 June 2020 and has applied since 1 December 2020.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 28 pages — is available in the English PDF.

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