GB/T 14985-2007 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 14985-2007 | English | 160 |
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General rules of dimensions, shape, surface, quality, testing method and inspection for expansion alloys
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| GB/T 14985-1994 | English | 439 |
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General rules of dimensions, shape, surface quality, test mothod and inspection for expansion alloys
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GB/T 14985-2007: General rules of dimensions, shape, surface, quality, testing method and inspection for expansion alloys
---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/GBT14985-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.99
H 58
Replacing GB/T 14985-1994
General rules of dimensions, shape, surface, quality, testing
method and inspection for expansion alloys
Issued on. AUGUST 14, 2007
Implemented on. MARCH 01, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Order content... 7
4 Dimensions, shapes and allowable deviations... 8
5 Surface quality... 12
6 Testing methods... 12
7 Inspection rules... 13
8 Packaging, marks and quality certificate... 14
Annex A (normative) Inspection method for expansion alloy phase transformation.. 15
Foreword
This Standard replaces GB/T 14985-1994 "General rules of dimensions, shape, surface
quality, test method and inspection for expansion alloys".
Compared with GB/T 14985-1994, the main changes in this Standard are as follows.
- Add "Normative references" and "Order content";
- Revise the allowable deviation for dimension and shape regulations of cold-drawn
(pulled) wire to directly refer to the relevant content in GB/T 342;
- Revise the provisions of "higher precision and ordinary precision" in the allowable
deviation of cold rolled strip thickness dimensions in GB/T 14985-1994 to that it
shall be carried out according to the provisions of width ≥ 150 mm and width ≤
150 mm. Modify the original negative deviation to positive and negative deviation;
- Revise the allowable deviation for dimension and shape regulations of cold drawn
and polished rods to directly refer to the relevant content in GB/T 3207;
- Revise the allowable deviation for dimension of hot forged materials to directly
refer to the relevant content in GB/T 908.For the 20 mm ~ < 50 mm hot forged
materials not included in GB/T 908, it is revised to "the allowable diameter
deviation of 20 mm ~ < 50 mm hot forged materials is +1.5 mm, -0.5 mm"; For the
allowable deviation of the diameter of the hot forged material ≥50 mm, the
accuracy requirements in Table 2 of GB/T 908 shall be directly quoted;
- Revise the allowable deviation for dimension and shape regulations of hot rolled
bars to directly refer to the relevant content in GB/T 702;
- Delete the words "peeling, burrs, etc. that affect the use" from the surface quality
in GB/T 14985-1994;
- In Table 4, add the note "The air tightness test shall be carried out by the buyer.
The thickness of the specimen to be tested shall be specified in the contract,
otherwise the test shall be carried out according to the specimen grade A specified
in GB/T 5778 ";
- In Chapter 7, add the content "if the size, shape and surface quality are unqualified,
it is a substandard product";
- Add " 8 Packaging, marks and quality certificate".
Annex A of this Standard is normative.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of National Technical Committee of
Standardization Administration of China.
The drafting organizations of this Standard. Shaanxi Precision Alloy Co., Ltd.,
Shanghai Iron and Steel Research Institute.
Main drafters of this Standard. Zhang Ailing, Liu Yongqing.
Versions of standard substituted by this document are.
GBn100-1981, GBn100-1987, GB/T 14985-1994.
General rules of dimensions, shape, surface quality, testing
method and inspection for expansion alloys
1 Scope
This Standard specifies the dimensions, shape and allowable deviation, surface quality,
testing methods, inspection rules, packaging, marks and quality certificates for
expansion alloys.
This Standard applies to expansion alloys with a certain average linear expansion
coefficient within a certain temperature range.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments (excluding
corrigendum) 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 222, Permissible tolerances for chemical composition of steel products
GB/T 223.3, Methods for chemical analysis of iron, steel and alloy. The daintily
methane phosphomolybdate gravimetric method for the determination of
phosphorus content
GB/T 223.4, Iron, steel and alloy - Determination of manganese content -
Potentiometric or visual titration method
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 223.11, Iron, steel and alloy - Determination of chromium content - Visual
titration or potentiometric titration method
GB/T 223.17, Methods for chemical analysis of iron, steel and alloy - The
diantipyrylmethane photometric method for the determination of titanium 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 223.20, Methods for chemical analysis of iron steel and alloy - The
Potentiometric titration method for the determination of cobalt content
3 Order content
The contract or order for ordering according to this Standard shall include the
followings.
4 Dimensions, shapes and allowable deviations
4.1 Cold drawn (pulled) wires
4.1.1 Dimension and allowable deviation
The diameter of cold drawn (pulled) wire is. 0.10 mm ~ 7.00 mm. The allowable
deviation of its diameter shall comply with the precision requirements in Table 2 or
Table 3 in GB/T 342-1997.The accuracy grade should be specified in the contract.
When not specified, it is provided with grade 10 accuracy.
4.2 Cold rolled (drawn) pipes
4.2.1 Dimension and allowable deviation
4.2.1.1 Outer diameter and allowable deviation for inner-outer diameters, wall
thickness
The outer diameter and allowable deviation for inner and outer diameters, wall
thickness of cold rolled (drawn) seamless pipes shall comply with the regulations of
Table 1.Other specifications and size tolerances are negotiated between the supplier
and the buyer.
4.2.2 Shape
4.2.2.1 The curvature per meter of the pipe is not greater than 2 mm. The total curvature
is not greater than 0.2% of the total length.
4.3 Cold rolled strips
4.3.1 Dimension and allowable deviation
4.3.2 Shape
4.3.2.1 Strips with a thickness not greater than 1.5 mm shall be delivered in rolls. If the
buyer requires delivery in straight strips or in fixed lengths and multiples, it should be
specified in the contract.
4.4 Cold drawn and polished bars
4.4.1 Dimension and allowable deviation
Diameter of cold drawn and polished bars. 1.0 mm ~ 40.0 mm. The allowable diameter
deviation should meet the accuracy requirements of 9(9h), 10(10h) and 11(11h) in Table
2 of GB/T 3207-1988.The accuracy grade should be specified in the contract. When
not specified, it is provided according to grade 11 accuracy.
4.5 Hot forged material
4.5.1 Dimension and allowable deviation
Dimensions and allowable deviations of hot forged materials shall comply with the
provisions in Table 3.
4.5.2 Shape
4.5.2.1 The out-of-roundness of round steel should not exceed half of the diameter
tolerance. The diagonal length of the square steel shall not be less than 1.4 times the
lower limit of the side length.
4.6 Hot rolled material
4.6.1 Dimension and allowable deviation
5 Surface quality
5.1 Cold rolled (pulled, drawn, polished) material
The surface of cold rolled (pulled, drawn, polished) materials should be smooth.
Defects such as microcracks, delamination, folds, scars, rust, scratches, oxidized colors,
and pitting are not allowed.
6 Testing methods
The testing methods for the performance inspection of each batch of alloys shall be
carried out in accordance with the provisions in Table 5.
7 Inspection rules
7.1 Inspection and acceptance
The inspection and acceptance of finished products shall be carried out by the quality
and technical supervision department of the supplier.
7.2 Batching rules
Finished products should be submitted in batches for inspection and acceptance. Each
batch consists of alloy materials with the same alloy designation, the same furnace (tank)
number, the same processing method, the same size, the same delivery state, and the
same heat treatment system.
7.4 Reinspection and judgement rules
7.4.1 If the inspection results of the expansion coefficient are unqualified, double the
number of samples should be taken for reinspection. Even if one sample is unqualified
in the reinspection results, this furnace of alloys shall be rejected.
7.4.4 When the user requests to test the airtightness of alloy materials, each batch of
alloy materials shall be managed according to A and B heads.
7.4.5 If the dimension, shape and surface quality are unqualified, it will be judged as
unqualified product.
7.4.6 If the results of other inspections are unqualified, double the number of specimens
should be taken for reinspection of the unqualified items. If the reinspection results are
still unqualified, then this batch of alloys shall be rejected.
8 Packaging, marks and quality certificate
The packaging, marks and quality certificate of finished alloy materials shall comply
with the relevant provisions of GB/T 13297.
Annex A
(normative)
Inspection method for expansion alloy phase transformation
A.1 Scope
This method is applicable to the phase transformation inspection of expansion alloys
such as 4J29, 4J34, 4J40, 4J32 and 4J28.
A.2 Test principle
Put the specimen in a container. Freeze at a certain temperature. After a certain freezing
time, measure the γ→α martensitic transformation.
A.3 Specimen
A.3.1 Specimen cutting
A.3.2 Grinding of specimens
Diameter (side length) ≤
20mm Diameter >20~60 mm Diameter >60 mm Side length >60 mm
(Specimen thickness is 10 mm)
A.3.3 Polishing of specimens
A.3.3.1 The polished side of the specimen shall be a complete section. Longitudinal
sections can also be used, but the inspection area must be guaranteed.
A.3.3.2 Polishing is the last process of specimen grinding. Its purpose is to eliminate
the fine wear marks after fine grinding and obtain a bright mirror surface without wear
marks. The method uses electrolytic polishing. Commonly used electrolytic polishing
fluids and electrolytic specifications are shown in Table A.1.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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