YB/T 5241-2014 English PDF (YB/T5241-2014)

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YB/T 5241-2014: Iron-nickel and iron-nickel-cobalt alloys with low expansion
YB/T 5241-2014
YB
FERROUS METALLURGY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.99
H 58
Replacing YB/T 5241-2005
Iron-nickel and iron-nickel-cobalt alloys with low expansion
ISSUED ON: OCTOBER 14, 2014
IMPLEMENTED ON: APRIL 01, 2015
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Ordering content ... 6
4 Classification and code ... 6
5 Dimensions and shape ... 7
6 Technical requirements ... 7
7 Test methods ... 9
8 Inspection rules ... 9
9 Packaging, marking, quality certificate ... 10
Appendix A (Informative) Typical average linear expansion coefficient of alloys ... 11
Foreword
This standard was drafted according to the rules given in GB/T 1.1-2009.
This standard replaces YB/T 5241-2005 "Iron-nickel and iron-nickel-cobalt alloys with
low expansion".
Compared with YB/T 5241-2005, the main changes of this standard are as follows:
- ADD the composition and related properties of the alloy designation 4J32A;
- USE "flat" to replace "plate" in "Scope" and "Delivery state";
- ADD the normative references;
- ADD the delivery state "cold drawn (WCD)" in the classification and code,
subdividing the hot rolled (forged) state into: "hot rolled (WHR)", "hot forged
(WHF)";
- MODIFY the "air tightness" requirements;
- ADD the "non-destructive testing";
- ADD the "special requirements";
- ADD the test method table 3;
- MODIFY the re-inspection and judgment rules.
This standard replaces YB/T 5241-2005 from the date of implementation.
This standard was proposed by the China Iron and Steel Association.
This standard shall be under the jurisdiction of the National Technical Committee for
Steel Standardization (SAC/TC 183).
The drafting organizations of this standard: General Iron and Steel Research Institute,
Metallurgical Industry Information Standards Research Institute.
The main drafters of this standard: Lu Fengshuang, Zhang Jianfu, Zhang Jinglin, Luan
Yan, Hou Jie, Cai Kaihong, Yu Min, Xu Jun, Huo Dengping.
This standard replaces the standard previously issued as follows:
- GBn 111-1981; GBn 132-1981; GBn 110-1981; GBn 110-1987; YB/T 5241-1993;
YB/T 5241-2005.
Iron-nickel and iron-nickel-cobalt alloys with low expansion
1 Scope
This standard specifies the dimensions, shapes, technical requirements, test methods,
inspection rules, packaging, marking, quality certificates of iron-nickel 4J36 alloy, free-
cutting 4J38 alloy, iron-nickel-cobalt 4J32, 4J32A, 4J40 alloy bars, strips, flats, wires,
tubes.
This standard applies to iron-nickel and iron-nickel-cobalt alloys with low expansion
for making instrument parts, which have high precision requirements and
approximately constant dimensions within a certain range of ambient temperature
changes.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The diantipyryl
methane phosphomolybdate gravimetric method for the determination of
phosphorus content
GB/T 223.18 Methods for chemical analysis of iron steel and alloy - The sodium
thiosulfate separation iodometric method for the determination of copper 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 223.21 Methods for chemical analysis of iron steel and alloy - The 5-CL-
PADAB spectrophotometric method for the determination of cobalt content
GB/T 223.22 Methods for chemical analysis of iron, steel and alloy - The nitroso-
R-salt spectrophotometric method for the determination of cobalt content
GB/T 223.25 Methods for chemical analysis of iron, steel and alloy - The
GB/T 5777 Seamless steel pipe and tubing methods for ultrasonic testing
GB/T 6394 Metal - Methods for estimating the average grain size
GB/T 8651 Metal plates - Flaw detection method by the ultrasonic plate wave
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)
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 Ordering content
The contract or order for ordering according to this standard shall include the following
contents:
a) Standard number;
b) Product name;
c) Designation;
d) Delivery weight or quantity;
e) Dimensions;
f) Delivery state;
g) Non-destructive testing method and qualified level (see 6.10);
h) Special requirements.
4 Classification and code
Alloys are classified as follows according to the delivery state:
Soft state S;
6.3.2 Flats are delivered in hot rolled (forged) states.
6.3.3 Strips, wires, tubes shall be delivered in either soft or hard state.
6.4 Average linear expansion coefficient
The average linear expansion coefficient of the alloy shall comply with the provisions
of Table 2.
6.5 Phase transformation
After the 4J32, 4J32A, 4J40 alloys are subject to the heat treatment system specified in
Table 2, the γα phase transformation temperature shall be below -60 °C. For bars with
a size greater than 25 mm, local phase transformation is allowed.
6.6 Grain size
The grain size of soft strip shall not be coarser than grade 6; the grain size coarser than
grade 6 shall not exceed 10% of the area. When measuring the average grain size of
strip with a thickness of less than 0.13 mm, the number of grains along the thickness
direction of the strip shall be no less than 6.
6.7 Air tightness
According to the requirements of the purchaser, 4J40 alloy bars with a diameter or side
length of not less than 15 mm can be tested for air tightness; there shall be no leakage.
6.8 Process performance
Strips for deep drawing, or hard strips delivered after appropriate heat treatment, shall
have good deep drawing performance; ears are not allowed to appear during deep
drawing.
6.9 Surface quality
The surface quality of alloy materials shall comply with the relevant provisions of GB/T
supplier's technical quality supervision department. The buyer has the right to inspect
and accept according to the standard. The airtightness test shall be carried out by the
buyer. If there are special requirements for the supplier to conduct the inspection, both
parties shall reach an agreement and indicate it in the contract.
8.2 Group-batching rules
The finished products 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 size, the same delivery status.
8.3 Sampling rules
The sampling rules for each batch of alloy materials shall comply with the provisions
of GB/T 14985-2007.
8.4 Re-inspection and determination rules
The re-inspection and determination rules for alloy materials shall comply with the
relevant provisions of GB/T 14985-2007.
9 Packaging, marking, quality certificate
The packaging, marking, quality certificate of finished alloy materials shall comply
with the relevant provisions of YB/T 5242.