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GB/T 30063-2013 English PDF (GBT30063-2013)

GB/T 30063-2013 English PDF (GBT30063-2013)

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GB/T 30063-2013: Longitudinal submerged arc welded steel tubes for structural purpose
This standard specifies the dimensions, shape, weight, technical requirements, test methods, inspection rules, markings, packaging and quality certificates for longitudinal submerged arc welded steel tubes for structural purpose. This standard is applicable to longitudinal submerged arc welded steel tubes, which have an outer diameter not less than 400 mm, for buildings, bridges, towers, piles, struts and other general structures. It is not applicable to steel tubes for mechanical structures.
GB/T 30063-2013
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Longitudinal submerged arc welded steel tubes for
structural purpose
ISSUED ON. DECEMBER 17, 2013
IMPLEMENTED ON. SEPTEMBER 01, 2014
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Ordering content ... 6
4 Dimension, shape, weight and allowable deviations ... 7
5 Technical requirements ... 11
6 Test methods ... 17
7 Inspection rules ... 18
8 Packaging, marking and quality certificate ... 18
Longitudinal submerged arc welded steel tubes for
structural purpose
1 Scope
This standard specifies the dimensions, shape, weight, technical requirements, test methods, inspection rules, markings, packaging and quality certificates for longitudinal submerged arc welded steel tubes for structural purpose.
This standard is applicable to longitudinal submerged arc welded steel tubes, which have an outer diameter not less than 400 mm, for buildings, bridges, towers, piles, struts and other general structures (hereinafter referred to as “steel tubes”). It is not applicable to steel tubes for mechanical structures. 2 Normative references
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 standard.
GB/T 222 Permissible tolerances for chemical composition of steel products 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 aluminum content -
Chrom-azurol S photometric 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 223.14 Methods for chemical analysis of iron, steel and alloy - The N- Benzoy-N-Phenylhydroxylamine extraction photometric 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 titanium
content
GB/T 223.19 Methods for chemical analysis of steels and alloys - The 2,9- dimethyl-1,10-phenanthroline-trichloromethane extraction
spectrophotometric method for the determination of copper content
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method
GB/T 223.37 Methods for chemical analysis of iron, steel and alloy - The indophenol blue photometric method for the determination of nitrogen
content after distillation separation
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method
GB/T 223.54 Methods for chemical analysis of steels and alloys - The flame atomic absorption spectrophotometry for the determination of nickel content GB/T 223.58 Methods for chemical analysis of steels and alloys - The
sodium arsenite-sodium nitrite titration 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 223.68 Methods for chemical analysis of iron steel and alloy - The combustion potassium iodate volumetric method for the determination of
sulfur content
GB/T 223.69 Iron, steel and alloy - Determination of carbon contents - Gas- volumetric method after combustion in the pipe 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 700 Carbon structural steels
GB/T 1591 High strength low alloy structural steels
GB/T 2102 Acceptance packing marking and quality certification of steel tube GB/T 2653 Bend test methods on welded joints
GB/T 2975 Steel and steel products - Location and preparation of test pieces for mechanical testing
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element
contents - Spark discharge atomic emission spectrometric method (routine The difference of tube diameter of the steel tube is the absolute value of the difference between the outer diameters of the both ends of the same steel tube. The outer diameter shall be measured within a range of 25 mm from the tube’s end, the difference of the steel tube shall comply with the requirements of Table 2.
According to the requirements of the purchaser, through negotiation between the supplier and the purchaser, and as indicated in the contract, it may supply the steel tubes of other outer diameter differences than those as specified in Table 2.
4.3 Out-of-roundness
For steel tubes with a ratio of outer diameter to wall thickness not exceeding 75, the out-of-roundness shall neither exceed 1.0% nor exceed 15 mm. According to the requirements of the purchaser, through negotiation between the supplier and the purchaser, and as indicated in the contract, it may supply the steel tubes of other specified out-of-roundness.
For steel tubes with a ratio of outer diameter to wall thickness exceeding 75, the out-of-roundness is determined through negotiation between the supplier and the purchaser.
4.4 Curvature
The curvature per meter of the steel tube shall not exceed 1.5 mm, the full- length curvature shall neither exceed 0.1% of the length of the steel tube nor exceed 10 mm.
4.5 Tube’s end
The chamfer of the end faces at both ends of the steel tube shall not exceed 3 mm, the chamfer is as shown in Figure 1. The cutting burrs shall be removed. The end face of the steel tube shall be delivered in a flat end. According to the requirements of the purchaser, through negotiation between the supplier and the purchaser, and as indicated in the contract, the end face of the steel tube may be grooved, the groove angle shall be , the blunt edge is 1.6 mm ±
0.8 mm. The groove and the blunt edge are as shown in Figure 2.
Steel tubes shall be delivered in welded status. According to the requirements of the purchaser, through negotiation between the supplier and the purchaser, and as indicated in the contract, the steel tube may be delivered in the overall heat treatment status.
5.4 Mechanical properties
5.4.1 Longitudinal tensile test of steel tube
The longitudinal tensile mechanical properties of the base metal of steel tubes of each designation shall comply with the requirements of Table 4 and Table 5, respectively.
5.4.2 Transverse tensile test of steel tube
According to the requirements of the purchaser, through negotiation between the supplier and the purchaser, and as indicated in the contract, the steel tube may be subjected to transverse tensile test of the base metal. The transverse tensile mechanical properties of steel tubes of each designation shall meet the requirements of Table 4 and Table 5, respectively.
5.4.3 Tensile test of welded joints
The steel tube shall be subjected to the tensile test of longitudinal welded joints. When the welded joint is subjected to tensile test, the weld shall be located in the middle of the specimen, the tensile strength of steel tube of each
designation shall meet the requirements of Table 4 and Table 5, respectively. According to the requirements of the purchaser, through negotiation between the supplier and the purchaser, and as indicated in the contract, when
performing welding procedure qualification, the butt-jointed steel tube may be subjected to the tensile test of the circumferential welded joint.
5.4.4 Charpy V-notch impact test
According to the requirements of the purchaser, through negotiation between the supplier and the purchaser, and as indicated in the contract, the steel tube may be subjected to the longitudinal Charpy V-notch impact test of the base metal. The impact absorbed energy of steel tube of each designation shall meet the requirements of Table 4 and Table 5, respectively.
the remaining wall thickness at the defect removal shall be no less than the minimum value as allowed by the wall thickness.
Other local imperfections that do not exceed the allowable negative deviation of wall thickness are allowed to exist.
5.8.2 Weld reinforcement
When the wall thickness is not more than 12.5 mm, the inner and outer weld’s reinforcement exceeding the original surface profile of the steel tube shall be not more than 3.2 mm; when the wall thickness is greater than 12.5 mm, the inner and outer weld’s reinforcement exceeding the original surface profile of the steel tube shall be not more than 3.5 mm... The excessive part of the weld reinforcement allows for grinding.
5.8.3 Weld undercut
The weld shall be smoothly transitioned to the parent metal. Undercuts which have a depth of not more than 0.5 mm may not be ground. For the undercut which has a depth more than 0.5 mm, if the remaining wall thickness after grinding is not less than the minimum wall thickness requirement as specified in this standard, it may be delivered after grinding; otherwise, it shall carry out repair welding, which shall meet the requirements of 5.10.
5.8.4 Radial misalignment
When the wall thickness is not more than 12.5 mm, the radial misalignment of the longitudinal joint of the steel tube shall not exceed 1.5 mm; when the wall thickness is greater than 12.5 mm, the radial misalignment of the longitudinal joint of the steel tube shall not exceed 12.5% of the wall thickness, the maximum shall be not more than 2.5 mm.
5.9 Butt-joint of steel tube
With the consent of the purchaser, the supplier may deliver the steel tube in butt-joint. The butt weld quality shall comply with the provisions of 5.3 ~ 5.7 (if applicable). The length of the short pipe used for butt-joint shall be not less than 1.5 m. Straight joint of steel tubes shall be staggered by approximately 180° during butt-joint. The misalignment of the circumferential joint during the butt- joint shall not exceed 20% of the wall thickness, the maximum shall not exceed 3.2 mm. The curvature of the steel tube after butt-joint shall comply with the provisions of 4.4.
5.10 Repair of defects
For the steel tube’s weld defects and base metal defect which has a depth not more than 1/3 of base metal’s thickness, it may be subjected to weld repair by
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