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YB/T 5240-2005 English PDF (YBT5240-2005)

YB/T 5240-2005 English PDF (YBT5240-2005)

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YB/T 5240-2005: The glass sealed iron-chromium alloy 4J28

This standard specifies the size, shape, technical requirements, test methods, inspection rules, packaging, marks, quality certificates of glass sealed iron-chromium alloy 4J28. This standard applies to iron-chromium alloys that are matched and sealed by soft glass on electrical components.
YB/T 5240-2005
YB
FERROUS METALLURGY INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 77.140.99
H 58
YB/T 5231-2005
YB/T 5233-2005
YB/T 5235 ~ 5241-2005
Replacing YB/T 5231 ~ 5241-1993
Alloy with expansion
ISSUED ON: JULY 26, 2005
IMPLEMENTED ON: DECEMBER 01, 2005
Issued by: National Development and Reform Commission of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Order contents ... 4
4 Classification and code ... 5
5 Sizes, shapes, tolerances ... 5
6 Technical requirements ... 5
7 Test method ... 7
8 Inspection rules ... 7
9 Packaging, marking, quality certificate ... 7
Appendix A (Informative) Typical expansion coefficient of alloy ... 8
The glass sealed iron-chromium alloy 4J28
1 Scope
This standard specifies the size, shape, technical requirements, test methods, inspection rules, packaging, marks, quality certificates of glass sealed iron-chromium alloy 4J28. This standard applies to iron-chromium alloys that are matched and sealed by soft glass on electrical components.
2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) 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 14985 General rules of dimensions shape surface quality testing method and inspection for expansion alloys
3 Order contents
The contract or order according to this standard shall include the following contents: a) Standard number;
b) Product name;
c) Trademark or unified digital code;
d) Weight (or quantity) of the delivery;
e) Size and shape;
f) Processing method;
g) Delivery status and performance;
h) Special requirements.
6.3.3 Flat products are delivered in hot-rolled state.
6.3.4 Strips, wires, pipes are delivered in either soft state (S) or hard state (H). 6.4 Hardness
Soft strip hardness HV shall not exceed 170. For the strips with a thickness less than 0.2 mm, they are exempted from hardness inspection.
6.5 Physical properties
The average linear expansion coefficient of the alloy shall meet the requirements in Table 2.
6.6 Phase change
After the alloy is treated by the heat treatment system specified in Table 2, martensite shall not appear, but austenite is allowed.
6.7 Grain size
The grain size of the soft strip shall not be less than grade 6; the grain size smaller than grade 6 shall not exceed 10% of the area.
For strips with a thickness less than 0.13 mm, when estimating the average grain size, the number of grains along the thickness direction of the strip shall not be less than 6. 6.8 Airtightness
When the rods, which have diameter or side length not less than 15 mm, are tested for air tightness, there shall be no air leakage.
6.9 Process performance
After proper heat treatment, the deep-drawn or hard-state strip shall have good deep- drawing properties; lugs are not allowed to appear during deep-drawing. 6.10 Surface quality
The surface quality of alloy materials shall comply with the relevant provisions of GB/T 14985.

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