Cast iron rolls
1 Scope
This document specifies the technical requirements, test methods, inspection rules, marks, packaging and quality certificate of cast iron rolls.
This document is applicable to cast iron rolls used for metal material processing and composite rolls (including roll rings) with cast iron working layers.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 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 α-benzoinoxime gravimetric method for the determination of molybdenum content
GB/T 223.38 Methods for chemical analysis of iron, steel and alloy - The anion-exchange separation-gravimetric method for the determination of niobium content
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method
GB/T 223.43 Iron steel and alloy - Determination of tungsten content - Gravimetric method and spectrophotometric method
GB/T 223.46 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric methods for the determination of magnesium content
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of phosphorus content
GB/T 223.63 Iron, steel and alloy - Determination of manganese content - Sodium (potassium) periodate spectrophotometric method
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate titration method after
combustion in the pipe furnace for the determination of sulfur content
GB/T 223.71 Methods for chemical analysis of iron, steel and alloy - The gravimetric method after combustion in the pipe furnace for the determination of carbon content
GB/T 223.79 Iron and steel - Determination of multi-element contents - X-ray fluorescence spectrometry (routine method)
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 9445 Non-destructive testing - Qualification and certification of personnel
GB/T 12604.1 Non-destructive testing - Terminology - Ultrasonic testing
GB/T 13313 Methods of shore and leeb hardness testing for rolls
GB/T 14203 General rules for spark discharge atomic emission spectrometry
GB/T 15546 Terms of mill rolls
JB/T 10061 Commonly used specification for A-mode ultrasonic flaw detector using pulse echo technique
JB/T 10062 Testing methods for performance of probes used in ultrasonic flaw detection
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 12604.1 and GB/T 15546 and the following apply.
3.1
outer layer thickness
thickness of the same material of the working layer of a composite roll
3.2
single defect
defect with the spacing between adjacent ones greater than 8 times of the equivalent of major defect at the specified sensitivity
Note: Defect spacing is determined according to the center position of the probe at the peak of defect echo.
3.3
concentrated defect
defect with the spacing between adjacent ones not greater than 8 times of the equivalent of major defect at the specified sensitivity
Note: The indicated area of concentrated defect is determined according to the specified sensitivity.
3.4
backwall echo attenuation zone
zone where the radial backwall echo attenuates to less than 10%f.s due to internal defects of the roll
4 Technical requirements
4.1 General requirements
4.1.1 Rolls shall be manufactured in accordance with this document according to the use of the rolls and the order drawing and technical agreement confirmed by the supplier and purchaser.
4.1.2 Technical requirements other than those in this document shall be determined by the supplier and the purchaser through negotiation.
4.2 Chemical composition and surface hardness
4.2.1 The chemical composition and surface hardness of the outer layer shall meet the requirements of Table 1.
4.2.2 The core of centrifugal casting composite roll should be made of high-strength ductile iron or high-strength steel material.
4.2.3 The inner layer of centrifugal casting composite roller ring should be made of graphite steel or high-strength iron material.
4.2.4 The chemical composition of the core is designed by the manufacturer according to the performance requirements.
Contents
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Test methods
6 Inspection rules
7 Marking, packaging and quality certificate
Annex A (Normative) Neck structure inspection of ductile rolls and spherical core composite rolls
Annex B (Normative) Ultrasonic testing method for cast iron rolls
