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GB/T 38960-2020 English PDF (GBT38960-2020)

GB/T 38960-2020 English PDF (GBT38960-2020)

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GB/T 38960-2020: Cryogenic-resistant controlled expansion alloys

This Standard specifies the order content, classification and code, dimension, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of cryogenic-resistant iron-nickelcobalt-based controlled expansion alloys. This Standard applies to iron-nickel-cobalt-based controlled expansion alloy 4J329D bars, flats, foils, strips, wires, pipes that are matched or sealed with semiconductors, hard glass, etc. in the field of space optoelectronics, semiconductor industry and other harsh deep-low temperature applications.
GB/T 38960-2020
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.99
H 58
Cryogenic-resistant controlled expansion alloys
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 ... 4
2 Normative references ... 4
3 Order content ... 6
4 Classification and code ... 7
5 Dimension, appearance and weight ... 7
6 Technical requirements ... 8
7 Test methods ... 11
8 Inspection rules ... 12
9 Packaging, marking and quality certificate ... 13
Annex A (informative) Typical properties of 4J329D alloys ... 14
Cryogenic-resistant controlled expansion alloys
1 Scope
This Standard specifies the order content, classification and code, dimension, shape, weight, technical requirements, test methods, inspection rules,
packaging, marking and quality certificate of cryogenic-resistant iron-nickel- cobalt-based controlled expansion alloys.
This Standard applies to iron-nickel-cobalt-based controlled expansion alloy 4J329D bars, flats, foils, strips, wires, pipes that are matched or sealed with semiconductors, hard glass, etc. in the field of space optoelectronics, semiconductor industry and other harsh deep-low temperature applications (hereinafter referred to as alloy materials).
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 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.9 Iron, steel and alloy - Determination of aluminium content - Chrome azurol S photometric method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy - The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content
GB/T 223.17 Methods for chemical analysis of iron, steel and alloy - The diantipyryl methane photometric method for the determination of titanium content
GB/T 223.19 Methods for chemical analysis of iron, steel and alloy - The neocuproine-chloroform extraction photometric method for the determination of copper content
GB/T 223.20 Methods for chemical analysis of iron, steel and alloy - The potentiometric titration method for the determination of cobalt content GB/T 6394 Determination of estimating the average grain size of metal
GB/T 8651 Flaw detection method by the ultrasonic plate wave for metal
plates
GB/T 11170 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (Routine method)
GB/T 14985-2007 General rules of dimensions, shape, surface, quality,
testing method and inspection for expansion alloys
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace
(routine method)
GB/T 20125 Low-alloy steel - Determination of multi-element contents -
Inductively coupled plasma atomic emission spectrometric method
GB/T 24183 Metallic materials - Earing test
GB/T 38938-2020 High strength and low expansion alloy
GB/T 38939 Nickel-based alloy - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
YB/T 5242 General rules of packaging, marking and quality certification for precision alloys
YB/T 5321-2006 Determination of hermeticity of expansion alloys
3 Order content
Contracts or orders ordered in accordance with this Standard shall at least include the following content:
a) serial number of this Standard;
b) product name;
c) designation;
d) delivery state;
e) dimension and allowable deviation;
f) weight or quantity;
g) phase transition level;
h) other special requirements.
4 Classification and code
4.1 According to hardness, alloy materials can be divided into:
a) soft state (S);
b) 1/4 hard state (H 1/4);
c) 1/2 hard state (H 1/2);
d) 3/4 hard state (H 3/4);
e) hard state (H).
4.2 According to processing method, alloys can be divided into:
a) deep drawn state (DQ);
b) cold drawn (WCD);
c) cold drawn polished (WCDG);
d) hot rolled (forged) state (WH).
5 Dimension, appearance and weight
5.1 The dimension, shape and allowable deviation of alloy wires, strips, flats, bars and pipes shall comply with the relevant provisions of GB/T 14985-2007. 5.2 The dimension, shape and allowable deviation of alloy foils shall comply with the provisions of Table 1. The thickness accuracy level shall be indicated in the contract. If it is not indicated, the products shall be delivered with normal accuracy.
Table 1 -- Dimension and allowable deviation of cold rolled foils mm
Thickness
Allowable deviation of thickness
Width
Allowable
deviation of width
General accuracy Higher accuracy Edge-cut
0.015 ~ 0.03 ??0.003 ??0.0015 10 ~ 100 ??0.15
> 0.03 ~ 0.05 ??0.005 ??0.0025 10 ~ 100 ??0.20
6.6.2.2 The average grain size of alloy bars and flats in the delivery state shall be level 3 or finer. This inspection may be exempted when the phase transition inspection is qualified.
6.7 Air permeability
According to the requirements of the purchaser, bars with a diameter or side length not less than 15 mm may be subjected to air permeability inspection, and there shall be no air leakage.
6.8 Process performance
Deep drawn strips, or strips delivered in hard state after proper heat treatment, shall have good deep-drawing performance and shall not have ears during deep-drawing. The allowable earing height shall be combined with the specific stamping parts, agreed upon between the supplier and the purchaser, and indicated in the contract.
6.9 Ultrasonic testing
6.9.1 Bars with a diameter or side length not less than 12 mm shall be subjected to ultrasonic testing, and the conformity level shall meet the requirements of Level A of GB/T 4162-2008.
6.9.2 Flats and plates may be subjected to ultrasonic testing according to GB/T 8651. The conformity level shall be agreed upon between the supplier and the purchaser and indicated in the contract.
6.9.3 Pipes may be subjected to ultrasonic testing according to GB/T 5777 or other general non-destructive testing methods. The conformity level shall be agreed upon between the supplier and the purchaser and indicated in the contract. If there are disputes caused by different methods, GB/T 5777 shall be the basis for arbitration.
6.10 Surface quality
The surface quality o alloy materials shall comply with the relevant provisions of GB/T 14985-2007.
6.11 Special requirements
Agreed upon between the supplier and the purchaser and indicated in the contract, it may supply alloy materials meeting other special requirements. 7 Test methods
7.1 The inspection items and test methods of alloy materials shall comply with supplier?€?s technical quality supervision department. The purchaser has the right to carry out inspection and acceptance according to the provisions of this Standard. The air permeability inspection shall be carried out by the purchaser. 8.2 Batching rules
Alloy materials shall be submitted for inspection and acceptance in batches. Each batch shall consist of alloy materials of the same alloy designation, the same furnace number, the same dimension, the same processing method and the same delivery state.
8.3 Sampling quantity and sampling position
The sampling quantity and sampling position of alloy materials shall comply with the provisions of Table 7.
8.4 Re-inspection and determination rules
The re-inspection and determination rules of alloy materials shall comply with the provisions of GB/T 14985-2007.
9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of alloy materials shall comply with the provisions of YB/T 5242.

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