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YB/T 5222-2014 English PDF (YBT5222-2014)

YB/T 5222-2014 English PDF (YBT5222-2014)

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YB/T 5222-2014: Quality hot rolled and forged carbon structural steel round tube blank

This Standard specifies the ordering content, size, shape, weight and allowable deviations, technical requirements, test methods, inspection rules and packaging, marks, quality certificates, etc. for quality hot rolled and forged carbon structural steel round tube blanks. This Standard is applicable to hot-rolled round tubes with a diameter of 50mm~400mm and forged round tube blanks with a diameter of 60mm~900mm (hereinafter referred to as tube blanks) for the manufacture of seamless steel pipes.
YB/T 5222-2014
YB
NONFERROUS INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 77.140.60
H 43
Replacing YB/T 5222-2004
Quality hot rolled and forged carbon structural steel round
tube blank
ISSUED ON: OCTOBER 14, 2014
IMPLEMENTED ON: APRIL 01, 2015
Issued by: Ministry of Industry and Information Technology of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Ordering content ... 7
4 Size, shape, weight and allowable deviations ... 7
5 Technical requirements ... 9
6 Test methods ... 11
7 Inspection rules ... 11
8 Packaging, marks, quality certificates ... 12
9 Numerical rounding ... 12
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces YB/T 5222-2004 "Quality carbon structural steel round tube blank". Compared with YB/T 5222-2004, the main changes in this document are as follows:
- Delete the relevant requirements for continuous cast round tube blanks; - Add the content related to forged round tube blanks;
- Modify the diameter range of round tube blanks;
- Modify the allowable diameter deviation;
- Modify the diameter cut slope;
- Modify the delivery state;
- Modify the relevant regulations on macrostructure.
This Standard was proposed by China Iron and Steel Industry Association. This Standard shall be under the jurisdiction of National Technical Committee on Steel of Standardization Administration of China (SAC/TC 183).
The drafting organizations of this Standard: Hunan Valin Xiangtan Iron and Steel Group Co., Ltd., Hengyang Valin Steel Pipe Co., Ltd., Tianjin Iron and Steel Group Co., Ltd., and Metallurgical Industry Information Standards Research Institute.
Main drafters of this Standard: Liu Jianbing, Zhao Bin, Gong Wenxu, Li Xiaoli, Xiao Hongguang, Sun Guoqing, Wang Yujie, Liu Baoshi, Wu Qingming.
Versions of standard substituted by this Standard are:
- GB/T 11172-1985;
- YB/T 5222-1993, YB/T 5222-2004.
Quality hot rolled and forged carbon structural steel round
tube blank
1 Scope
This Standard specifies the ordering content, size, shape, weight and allowable deviations, technical requirements, test methods, inspection rules and packaging, marks, quality certificates, etc. for quality hot rolled and forged carbon structural steel round tube blanks.
This Standard is applicable to hot-rolled round tubes with a diameter of 50mm~400mm and forged round tube blanks with a diameter of 60mm~900mm (hereinafter referred to as tube blanks) for the manufacture of seamless steel pipes.
2 Normative references
The following referenced documents are indispensable for the application 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 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 223.9, 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 223.12, Methods for chemical analysis of iron, steel and alloy. The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium 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 223.19, 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, Iron, steel and alloy -- Determination of nickel content -- The dimethylglyoxime spectrophotometric method
GB/T 223.36, Methods for chemical analysis of iron, steel and alloy. The neutral titration method for the determination of nitrogen content after distillation separation
GB/T 223.37, Iron, steel and alloy -- Determination of nitrogen content -- Indophenol blue spectrophotometric method after distillation separation GB/T 223.53, Methods for chemical analysis of iron, steel and alloy. The flame atomic absorption spectrophotometric method for the determination of copper content
GB/T 223.54, Iron, steel and alloy -- Determination of nickel content -- Flame atomic absorption spectrometric method
GB/T 223.58, Methods for chemical analysis of iron, steel and alloy -- The sodium arsenite-sodium nitrite titrimetric method for the determination of manganese content
GB/T 223.59, Iron, steel and alloy -- Determination of phosphorus content -- Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
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 223.61, Methods for chemical analysis of iron, steel and alloy -- The ammonium phosphomolybdate volumetric method for the determination of
phosphorus 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 223.64, Iron, steel and alloy -- Determination of manganese content -- Flame atomic absorption spectrometric method
GB/T 223.67, Iron, steel and alloy -- Determination of sulfur content -- Methylene blue 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 Unless otherwise specified in the contract, the smelting method is chosen by the manufacturer.
5.3 Delivery state
Tube blanks are generally delivered in hot-rolled and forged states. After negotiation between the supplier and the purchaser and noted in the contract, delivery can also be made in other states.
5.4 Macrostructure
5.4.1 Hot-rolled tube blanks with a diameter not greater than 250mm and forged tube blanks with a diameter not greater than 400mm shall not have visually visible white spots, delamination, cracks, shrinkage cavities, inclusions and skinning on the cross- section acid-leached microstructure test pieces. However, hot-rolled tube blanks with a diameter greater than 250mm and forged tube blanks with a diameter greater than 400mm are allowed to have shrinkage cavities not exceeding level 1.0 specified in GB/T 1979-2001 with the consent of the purchaser and stated in the contract. 5.4.2 For the macrostructure structural defects allowed to exist in the tube blank, general porosity, center porosity and segregation shall be evaluated according to GB/T 1979- 2001. The qualification level of tube blanks with a diameter not greater than 350mm is not greater than level 2.5; the qualification level of tube blanks with a diameter greater than 350mm is not greater than level 3.0.
5.4.3 After negotiation between the supplier and the purchaser, ultrasonic testing can be used instead of macrostructure testing. Its ultrasonic testing method and qualification level shall be specified in the contract.
5.5 Non-metallic inclusions
According to the requirements of the purchaser, the tube blanks can be inspected for non-metallic inclusions according to Method A in GB/T 10561-2005. The qualification level is determined by negotiation between the supplier and the purchaser. 5.6 Grain size
According to the requirements of the purchaser, the tube blank can be inspected for austenite grain size according to GB/T 6394. The qualification level is determined through coordination between the supplier and the purchaser.
5.7 Surface quality
5.7.1 There shall be no visible scars, folds, inclusions or cracks with a depth greater than 0.2mm on the surface of the tube blank. It is allowed to have individual small scratches, concave surfaces, pitting and other defects that do not exceed the negative deviation of the diameter from the actual size.

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