This standard specifies technical requirements, test methods, inspection rules, marking, packing, quality certificate and ultrasonic test methods of cast iron rolls.
This standard is applicable to composite roller (including roll collar) taking the cast iron roll and working layer used for metal material process as the cast iron material and the cast iron rolls with other purposes may be adopted as a reference.
2 Normative References
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest edition of the normative document referred to applies.
GB/T 145 Center hole (GB/T 145-2001, ISO 866: 1975, IDT)
GB/T 223.3 Methods for Chemical Analysis of Iron, Steel and Alloy-The Diantipyrylmethane Phosphomolybdate Gravimetric Method for the Determination of Phosphorus Content
GB/T 223.5 Methods for chemical analysis of iron, steel and alloy; The Reduced Molybdosilicate Spectrophotometric Method for the Determination of Acid-soluble Silicon Content
GB/T 223.11 Methods for Chemical Analysis of Iron, Steel and Alloy-The Ammonium Persulfate Oxidation Volumetric Method for the Determination of Chromium Content
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 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy The Sodium Thiosulfate Separation Iodimetric 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 223.23 Methods for Chemical Analysis of Iron, Steel and Alloy. The Dimethylglyoxime Spectrophotometric Method for the Determination of Nickel Content
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 Methods for Chemical Analysis of Iron Steel and Alloy; The Thiocyanate Direct Photometric Method for the Determination of Molybdenum Content
GB/T 223.28 Methods for Chemical Analysis of Iron Steel and Alloy; The D-denzoinoxime Gravimetric Method for the Determination of Molybdenum Content
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 223.63 Methods for Chemical Analysis of Iron, Steel and Alloy; The Sodium (Potassium) Periodate Photometric Method for the Determination of Manganese Content
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 228 Metallic Materials - Tensile Testing at Ambient Temperature (GB/T 228-2002, eqv ISO 6892:1998(E))
GB/T 1804 General Tolerances-Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications (GB/T 1804—2000, eqv ISO 2768-1:1989)
GB/T 9445 Non-Destructive Testing - Qualification and Certification of Personnel (GB/T 9445-2008, ISO 9712:2005, IDT)
GB/T 12604.1 Terminology for Nondestructive Testing Ultrasonic (GB/T 12604.1-2005, ISO 5577: 2000, IDT)
GB/T 13313 Methods of Shore and Leeb Hardness Testing for Rolls
JB/T 10061 Commonly Used Specification for A-mode Ultrasonic Flaw Detector using Pulse Echo Technique (JB/T 10061-1999, eqv ASTM E 750-80)
JB/T 10062 Testing Methods for Performance of Probes Used in Ultrasonic Flaw Detection
3 Technical Requirements
3.1 The manufacturing shall be carried out according to roller purpose and order pattern confirmed by the supplier and the demander and this standard. The technical requirements beyond this standard are determined through negotiation between the supplier and the demander.
3.2 Chemical composition and surface hardness of working layer and tensile strength of the roll necks shall meet those specified in Table 1.
3.3 Hardness uniformity of roll barrel surface is required to be less than five HSD.
3.4 Outer-layer thickness
3.4.1 Outer-layer thickness of centrifuge composite roll shall be larger 5mm than working layer.
3.4.2 The chill depth of the chilled roll shall meet those specified in Table 2; the chill depth difference of the roll barrel at the end face of the same side shall be less than 10mm and the chill depth difference of the roll barrel at end faces of both sides shall be less than or equal to 15mm.
3.5 Surface quality requirements
3.5.1 Visible manufacturing defect shall be free from the roll barrel working surface. The manufacturing defect not influencing application on other parts shall be repaired to reach the order pattern requirements confirmed by both Parties.
3.5.2 If the defects of the roller delivered by flat roll are in the hole pattern part and can be removed, the supplier and the demander may deliver by negotiation.
3.6 Internal defects of centrifuge composite cast iron roll shall meet the requirements of Table A.2 of Appendix A.
3.7 Metallographic structure inspection of roll neck of the nodular iron roll and ball core composite roll shall be carried out according to Appendix B; the roll neck spheroidization rate shall not be less than Grade 3 and Grade 1~5 of the roll neck carbide and ferrite volume shall be qualified.
3.8 Mechanical processing
3.8.1 Meets the requirements for the order pattern of the roller confirmed by the supplier and the demander.
3.8.2 Center hole: it is below 550mm from the barrel diameter; the center hole is recommended as 60° Type B and carried out according to GB/T 145; the center holes of the rollers with other specifications are recommended as 75° Type B and carried out according to Figure 1 and Table 3.
