GB/T 1504-2024 PDF English
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| GB/T 1504-2024 | English | 350 |
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Cast iron rolls
| Valid |
| GB/T 1504-2008 | English | 679 |
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Cast iron rolls
| Obsolete |
| GB 1504-1991 | English | 439 |
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Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 1504-2024
GB/T 1504-2024: Cast iron rolls---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/GBT1504-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.180
CCS H 94
Replacing GB/T 1504-2008
Cast Iron Rolls
Issued on: MARCH 15, 2024
Implemented on: OCTOBER 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 7
4 Technical Requirements... 7
5 Test Methods... 15
6 Inspection Rules... 16
7 Marking, Packaging and Quality Certificate... 17
Appendix A (normative) Inspection of Roll Neck Structure of Ductile Cast Iron Rolls
and Ball Core Composite Rolls... 18
Appendix B (normative) Ultrasonic Testing Method for Cast Iron Rolls... 22
Cast Iron Rolls
1 Scope
This document specifies the technical requirements, test methods, inspection rules, marking,
packaging and quality certificates for cast iron rolls.
This document applies to cast iron rolls used in metal material processing and composite rolls
(including roll rings) with the working layer made of cast iron.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 145 Center Holes
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 Diantipyryl Methane
Phosphomolybdate Gravimetric Method for the Determination of Phosphorus Content
GB/T 223.5 Steel and Iron - Determination of Acid-soluble Silicon and Total Silicon Content -
Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or
Potentiometric Titration Method
GB/T 223.13 Methods for Chemical Analysis of Iron, Steel and Alloy - The Ammonium Ferrous
Sulfate Titration Method for the Determination of Vanadium Content
GB/T 223.23 Iron, Steel and Alloy - Determination of Nickel Content - The Dimethylglyoxime
Spectrophotometric Method
GB/T 223.25 Methods for Chemical Analysis of Iron, Steel and Alloy - The Dimethylglyoxime
Gravimetric Method for the Determination of Nickel Content
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The Thiocyanate
Spectrophotometric Method
GB/T 223.28 Methods for Chemical Analysis of Iron, Steel and Alloy - The -benzoinoxime
Gravimetric Method for the Determination of Molybdenum Content
3 Terms and Definitions
The terms and definitions defined in GB/T 12604.1 and GB/T 15546, and the following are
applicable to this document.
3.1 outer layer thickness
The thickness of the same material of the working layer of the composite roll.
3.2 single defect
At the specified sensitivity, the spacing between adjacent defects is greater than 8 times the
equivalent of the larger defect.
NOTE. the spacing between defects is determined by the center position of the probe at the peak
of the defect echo.
3.3 concentrated defect
At the specified sensitivity, the spacing between adjacent defects is less than or equal to 8 times
the equivalent of the larger defect.
NOTE. the indication area of concentrated defect is determined by the specified sensitivity as the
boundary.
3.4 backwall echo attenuation zone
The area where the radial back wave is attenuated to less than 10% f.s due to internal defects
of the roll.
4 Technical Requirements
4.1 General Requirements
4.1.1 Manufactured in accordance with this document and the purposes of the roll and the order
drawings and technical agreements confirmed by the supply-side and the demand-side.
4.1.2 Technical requirements other than this document shall be determined by negotiation
between the supply-side and the demand-side.
4.2 Chemical Composition and Surface Hardness
4.2.1 The chemical composition and surface hardness of the outer layer shall comply with the
provisions of Table 1.
4.2.2 The core of the centrifugally cast composite roll should be made of high-strength ductile
cast iron, or high-strength steel.
5 Test Methods
5.1 Chemical composition analysis shall be carried out in accordance with the provisions of
relevant standards in Table 8, and GB/T 223.79 or GB/T 14203.During arbitration, the relevant
standards in Table 8 shall be used. The allowable deviation of the chemical composition of
finished products shall be implemented in accordance with the provisions of GB/T 222.
5.2 Hardness test shall be carried out in accordance with the provisions of GB/T 13313.
5.3 The test of mechanical properties shall be carried out in accordance with the provisions of
GB/T 228.1.
5.4 When the core is made of ductile cast iron, the metallographic structure inspection shall be
carried out in accordance with the provisions of Appendix A.
5.5 Ultrasonic testing of cast iron rolls shall be carried out in accordance with the provisions of
Appendix B.
6 Inspection Rules
6.1 The chemical composition shall be inspected furnace by furnace in accordance with the
smelting furnace, and the specimen shall be taken from the ladle before pouring. When the
chemical composition analysis is disqualified, sampling can be carried out on the working layer
of the roll for two re-inspections, and as long as it passes the re-inspection once, the result is
qualified.
6.2 The surface hardness of the roll body and roll neck shall be tested one by one, and the
number and position of the measurement points shall comply with the provisions of GB/T
13313.
6.3 The chill depth of the chilled cast iron rolls shall be checked and determined by the distance
between the first batch of gray spots on the end face of the roll body and the delivery roll surface.
The number of gray spots to be measured shall be no less than 3 within a 10 mm wide range
along the radius tangent direction of the end face of the roll body.
6.4 The roll neck structure of the cast iron rolls shall be inspected in accordance with the
proportion specified in the contract. The inspection position of the ductile cast iron rolls is the
roll neck surface on the transmission side, and the inspection position of the ball core composite
rolls is the roll neck surface on the operating side.
6.5 The surface quality, main dimensions and surface roughness shall be inspected one by one.
6.6 Ultrasonic testing shall be carried out on centrifugal composite cast iron rolls one by one,
and ultrasonic testing of other rolls shall be determined by negotiation between the supply-side
and the demand-side.
7 Marking, Packaging and Quality Certificate
7.1 After the finished product is qualified in the inspection, the manufacturer’s logo and roll No.
shall be engraved on the end face of the roll neck on the transmission side. If the demand-side
has specific requirements for the roll logo, it can be indicated in the order drawings or
agreement.
7.2 Before packaging, the key parts of the roll surface shall be protected with rust-proof
materials; the packaging should take into account the safety of the rolls during transportation
and hoisting, prevent damage and rust during transportation, and meet the requirement of no
rust within 6 months of indoor storage.
7.3 The packaged rolls shall be placed flat in a dry and ventilated indoor environment.
7.4 The rolls shall be accompanied by a quality certificate filled in by the quality inspection
department when exiting the factory, including.
a) Name of the supply-side;
b) Name of the demand-side;
c) Serial No. of this document;
d) Contract No., product No., roll No.;
e) Product specifications;
f) Material code, chemical composition range, hardness, ultrasonic testing results, roll
weight, production date;
g) Heat treatment status shall be indicated when blank exits the factory.
Appendix A
(normative)
Inspection of Roll Neck Structure of Ductile Cast Iron Rolls and Ball Core Composite
Rolls
A.1 Method
Use optical metallographic microscope to inspect the roll neck microstructure of ductile cast
iron rolls and composite rolls with ductile cast iron core and rate it.
A.2 Specimen Preparation
A.2.1 The metallographic specimen of the roll neck is cut at the end of the roll neck base, or it
can be directly inspected at the designated inspection position on the roll neck surface.
A.2.2 When cutting and preparing the specimen, it shall not be over-heated or over-burned.
When grinding and polishing, it shall be ensured that the original microstructure is not
destroyed. The surface of the specimen shall be smooth and there shall be no obvious scratches
or visual defects.
A.2.3 When preparing the specimen containing graphite, the graphite shall not be peeled,
contaminated or deformed.
A.3 Inspection Requirements
A.3.1 The inspection position is determined in accordance with the inspection requirements.
The inspection for rating shall be carried out at a position 5 mm ~ 15 mm away from the surface
on the specimen.
A.3.2 Microstructure inspection includes graphite, carbide and ferrite structure inspection.
A.3.3 During microstructure inspection, the inspected range shall be generally observed first,
and then, a representative field of view shall be selected to report the results.
A.3.4 Graphite inspection is carried out directly after polishing, with a magnification of 50
times; carbide and ferrite structure inspection is carried out after polishing and etching with 3%
~ 5% nitric acid alcohol, with a magnification of 100 times.
A.4 Inspection and Rating
A.4.1 Roll neck graphite morphology
The roll neck graphite morphology is divided into 5 types, see Table A.1 and Figure A.1 ~
Figure A.5.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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