GB/T 30063-2013 PDF English
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| GB/T 30063-2013 | English | 150 |
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Longitudinal submerged arc welded steel tubes for structural purpose
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GB/T 30063-2013: Longitudinal submerged arc welded steel tubes for structural purpose---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT30063-2013
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
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard refers to ASTM A500-2010 “Specification for cold-formed welded
and seamless carbon steel structural tubing in rounds and shapes” and JIS G
3444-2010 “Carbon steel tubes for general structure”.
This standard was proposed by the China Iron and Steel Association.
This standard shall be under the jurisdiction of the National Steel
Standardization Technical Committee (SAC/TC 183).
This standard is mainly drafted by. Panyu Zhujiang Steel tube Co., Ltd., Baoji
Petroleum Pipe Co., Ltd., Metallurgical Industry Information Standards Institute,
Zhejiang Jinzhou Pipeline Industry Co., Ltd.
The main drafters of this standard. Wang Lishu, Li Jianfeng, Bi Zongyue, Dong
Li, Yang Weifang, Li Fangxia, Zhang Zhigang, Feng Zhaotang, Wei Shaojun,
Gu Sumin, Wei Jiale, Yang Zhongwen.
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
3 Ordering content
3.1 Contracts or orders for ordering steel tubes in accordance with this standard
shall include the following.
3.2 As determined by the supplier and the purchaser through negotiation, and
indicated in the contract, the purchaser may choose the following
supplementary requirements.
4 Dimension, shape, weight and allowable deviations
4.1 Dimension
4.1.1 Outer diameter and wall thickness
The nominal outer diameter D and the nominal wall thickness S of the steel tube
shall comply with the requirements of Table 1.According to the requirements of
the purchaser, through negotiation between the supplier and the purchaser, it
may supply the steel tubes of other dimensions than those listed in Table 1.
4.1.2 Allowable deviation of outer diameter and wall thickness
The allowable deviation of outer diameter and wall thickness of the steel tube
shall comply with the requirements of Table 2 and Table 3, respectively.
4.2 Difference of tube diameter
4.7 Weight
4.7.1 Steel tubes are delivered according to theoretical weight. Through
negotiation between the supplier and the purchaser, and as indicated in the
Tube’s end contract, it may also be delivered according to the actual weight.
4.7.2 The allowable deviation of the actual weight and theoretical weight of each
batch or single steel tube shall be.
4.7.3 The theoretical weight of the steel tube is calculated according to formula
(1).
5 Technical requirements
5.1 Steel designation and chemical composition
5.1.1 The designation and chemical composition of the steel (melting analysis)
shall comply with the provisions for Q235B, Q235C in GB/T 700, Q345B,
Q345C, Q390B, Q390C, Q420B, Q420C, Q460C, Q460D in GB/T 1591 or
Q235GJC, Q345GJB, Q345GJC, Q390GJB, Q390GJC, Q420GJC in GB/T
19879, respectively.
5.2 Manufacturing process
Steel tubes shall be manufactured by double-sided longitudinal submerged arc
welding. The girth weld of butt-welded steel tube can be manufactured by
manual low-hydrogen electrode arc welding, submerged arc automatic welding,
automatic or semi-automatic fusion welding, and gas-shielded arc welding.
5.3 Delivery status
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
5.4.4 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.
5.5 Process performance
5.5.1 Guided bending test
For the steel tubes with a wall thickness of less than 10 mm, it shall respectively
take 1 face bending specimen and 1 back bending specimen to perform the
guided bending test. The specimen shall be cut from the vertical weld on the
steel tube. The weld is located in the middle of the specimen.
5.6 Macro inspection
For the submerged arc welded steel tube, it shall use the 10% ammonium
persulfate solution or a 4% nitric acid alcohol solution to perform the acid
etching inspection of the weld’s cross-section. After the test, the welds inside
and outside the specimen shall be completely penetrated, it is not allowed to
have non-penetration, non-fusion or cracking.
5.7 Non-destructive testing
According to the requirements of the purchaser, through negotiation between
the supplier and the purchaser, as indicated in the contract, it may perform the
ultrasonic testing or radiation testing against each weld (including butt-jointed
circumferential weld).
5.8 Appearance quality
5.8.1 Surface defects
The inner and outer surfaces of the steel tube shall be smooth, it is not allowed
to have folding, cracks, cold-lap, weld bead and ogival base defects (such as
scratches). These defects and ogival base defects shall be completely removed,
the remaining wall thickness at the defect removal shall be no less than the
minimum value as allowed by the wall thickness.
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
the use of manual low-hydrogen electrode arc welding, submerged arc
automatic welding, automatic or semi-automatic consumable electrode gas
shielded arc welding. Prior to repair, the defects shall be cleaned to meet the
welding requirements.
6 Test methods
6.1 The dimension and shape of the steel tube shall be measured one by one
using a gage that meets the accuracy requirements.
6.2 The inner and outer surfaces of steel tubes shall be inspected visually under
full lighting conditions.
6.3 Sampling methods and test methods for other inspection items of steel
tubes shall comply with the requirements of Table 7.
7 Inspection rules
7.1 Inspection and acceptance
The inspection and acceptance of steel tubes shall be carried out by the
supplier’s quality technical supervision and inspection department.
7.2 Group-batch rule
Steel tubes shall be inspected and accepted in batches. Each batch shall
consist of steel tubes of the same heat number, the same designation, the same
specification, the same welding procedure, and the same heat treatment
system (if applicable). The number of steel tubes per batch shall not exceed
100.
8 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel tubes shall comply with
the provisions of GB/T 2102.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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