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GB/T 31936-2015 English PDF (GBT31936-2015)

GB/T 31936-2015 English PDF (GBT31936-2015)

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GB/T 31936-2015: Rolls for welding steel pipe

This Standard specifies the technical requirements, test methods, inspection rules, mark, package, transportation, storage and quality certificate of the rolls for roll-forming straight-seam welding steel pipe.
GB/T 31936-2015
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.180
H 94
Rolls for Welding Steel Pipe
ISSUED ON. SEPTEMBER 11, 2015
IMPLEMENTED ON. JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative Reference ... 4
3 Technical Requirements ... 6
4 Test Methods ... 11
5 Inspection Rules ... 12
6 Mark, Package, Transportation, Storage and Quality Certificate ... 13 Appendix A (Informative) Recommended Usage of Various Rolls ... 15
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of National Technical Committee for Standardization of Steel (SAC/TC 183).
Drafting organizations of this Standard. Shandong Sifang Technical Development Co., Ltd., Shandong University, Zhangjiagang Jiejia Machinery Manufacture Co., Ltd., and New Metallurgy Hi-Tech Group Co., Ltd..
Chief drafting staffs of this Standard. Yuan Houzhi, Li Shengli, Liu Xingyi, Han Baoyun, and Zhang Ning.
Rolls for Welding Steel Pipe
1 Scope
This Standard specifies the technical requirements, test methods, inspection rules, mark, package, transportation, storage and quality certificate of the rolls for roll-forming straight-seam welding steel pipe.
This Standard is applicable to the forging rolls and casting rolls used in the production of roll-forming straight-seam welding steel pipe.
2 Normative Reference
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) are applicable to this document.
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 Diantipyrylmethane Phosphomolybdate Gravimetric Method for The
Determination of Phosphorus Content
GB/T 223.4 Methods for Chemical Analysis of Iron, Steel and Alloy ?€?
Determination of Manganese Content - Potentiometric Titration or Visual Titration 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 223.16 Methods for Chemical Analysis of Iron, Steel and Alloy - the Chromotropic Acid Photometric Method for the Determination of Titaninm 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 223.20 Methods for Chemical Analysis of Iron Steel and Alloy - the Potentiometric Titration Method for the Determination of Cobalt Content GB/T 223.23 Iron, Steel and Alloy-Determination of Nickel Content - the Dimethylglyoxime Spectrophotometric Method
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - the Thiocyanate Spectrophotometric Method
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 223.43 Iron Steel and Alloy - Determination of Tungsten Content -
Gravimetryc Method and Spectrophotometric Method
GB/T 223.85 Steel and Iron - Determination of Sulfur Content - Infrared Absorption Method after Combustion in an Induction Furnace
GB/T 223.86 Steel and Iron - Determination of Total Carbon Content - Infrared Absorption Method after Combustion in an Induction Furnace
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1 . Method of Test at Room Temperature
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1. Test Method (Scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 1503-2008 Cast Steel Rolls
GB/T 1804-2000 General Tolerances - Tolerances for Linear and Angular
Dimensions without Individual Tolerance Indications
GB/T 1958-2004 Geometrical Product Specifications (GPS) - Geometrical
Tolerance - Verification Prescription
GB/T 3177 Geometrical Product Specifications (GPS) - Inspection of Plain Workpiece Sizes
GB/T 4336 Carbon and Low-Alloy Steel - Determination of Multi-Element Contents -Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 13313 Methods of Shore and Leeb Hardness Testing for Rolls
3.5 Forging roll blank
3.5.1 The technical requirements of forging roll blank shall conform to the provision of YB/T 036.7.
3.5.2 Completely remove the macroscopic defects from the surface of the forging ingot; the materials with defects shall not be used for forging.
3.5.3 When forging the roll blank with the rolling material or forging material; generally the forging ratio is not considered; however, for the steel billet with large cross-section size, its upsetting forging ratio shall be ???1.5; when forging, only stretch the non- upsetting ones; its stretching forging ratio shall be ???1.7. When using steel ingot to forge the roll blank, the forging ratio shall be ???3.
3.5.4 The machining allowance and dimension tolerance of forging roll blank shall meet the requirements of YB/T 036.8.
3.5.5 The macrostructure of forging roll blank shall be free from white spots, internal cracks, and the like defects. Its microstructure shall conform to the provision of relevant corresponding steel grade standard.
3.5.6 The surface of forging roll blank shall be free from slight local cracks, overlapping and the like defects; its depth shall not exceed 1/2 of one-way machining allowance.
3.5.7 The forging-post roll blank shall be annealed immediately; the hardness after annealing shall conform to the provision of corresponding steel grade standard. 3.6 Casting roll blank
3.6.1 If the working surface of casting roll blank has slight defects, its depth shall not exceed 1/2 of one-way machining allowance.
3.6.2 Each roll blank shall reserve no less than 2 co-joined chemical composition specimens; the size of which shall be no less than 30mm??30mm??20mm.
3.7 Roll working surface hardness, hardness uniformity
Table 6 Roll Working Surface Hardness, Hardness Uniformity
Specification Roll Type Working Surface Hardness HRC
Hardness
Uniformity HRC
< ??168 Forming, sizing, straightening 56~62 3
?????168 Fine-forming, sizing, straightening, compositeside-squeezed roll, and bottom roll 56~62 4 All Rough-forming 56~60 4
All Composite top squeezed roll, double-roll-type squeezed roll 47~52 3 are less than the 20% of full scale, the internal radial ultrasonic flaw detection allows no existence of bottom-wave attenuation zone and crack defects.
3.13 Others
If special demands are required, then they shall be agreed by both purchaser and supplier.
4 Test Methods
4.1 The roll chemical composition shall be tested as per the provisions of GB/T 223.3, GB/T 223.4, GB/T 223.5, GB/T 223.11, GB/T 223.13, GB/T 223.16, GB/T 223.18, GB/T 223.20, GB/T 223.23, GB/T 223.26, GB/T 223.38, GB/T 223.43, GB/T 223.85, GB/T 223.86 or GB/T 4336. Arbitration analysis shall be performed as per the provision of GB/T 223. The allowable deviation of the chemical composition shall conform to the provision of GB/T 222.
4.2 The roll pass shall be tested as per the method of A 6.5 linear contour error detection code 1-2 in Appendix A of GB/T 1958-2004; and use the pass template approved by both the purchaser and supplier to test.
4.3 The measurement of other roll geometric dimension shall be performed as per the provision of GB/T 3177.
4.4 The test of roll shape and position tolerance shall be performed as per the provision of GB/T 1958-2004.
4.5 The measurement of roll surface roughness shall adopt specimen comparison method of roughness. When measurement results are controversial, other measuring instrument can be used to measure.
4.6 The roll working surface hardness shall be tested as per the provision of GB/T 230.1; or use Richter or Shore Hardness Tester to test; the test results shall perform hardness conversion asper the provision of GB/T 13313.
4.7 The tensile strength of roll working layer shall conform to the provision of GB/T 228.1.
4.8 The impact toughness of roll working layer at room temperature shall adopt specimen with size of 10mm??10mm??55mm and without notch to test as per the provision of GB/T 229.
4.9 The measurement of roll surface quality shall adopt visual observation method. 4.10 The magnetic particle flaw detection of roll working surface shall be performed as per the provision of GB/T 15822.1-GB/T 15822.3.
the same material, the same manufacturing process can be used for judgement agreed by both parties; the sampling position for the inspection of mechanical property shall be the axial of the te...

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