GB 18248-2008 English PDF (GB18248-2008)

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GB 18248-2008: [GB/T 18248-2008] Seamless steel tubes for gas cylinder
GB/T 18248-2008
GB
ICS 77.140.75
H 48
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
GB 18248–2008
Replacing GB 18248–2000
Seamless steel tubes for gas cylinder
ISSUED ON. DECEMBER 23, 2008
IMPLEMENTED ON. DECEMBER 01, 2009
Issued by.
General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3 
1  Scope ... 5 
2  Normative References ... 5 
3  Code ... 7 
4  Required information of ordering ... 8 
5  Size, shape, weight and tolerance ... 8 
6  Technical requirements ... 11 
7  Inspection and test methods ... 14 
8  Inspection rules ... 14 
9  Packaging, marking, and quality certificate ... 15 
Annex A (Informative) The approximate comparison of domestic and foreign grade .. 16 
Annex B (Informative) Mechanical property data reference values ... 17 
Foreword 
5.1, 5.2, 5.4, 5.6, 6.4, 6.8.2, Annex A and Annex B of this standard are
recommendatory; and the rest are mandatory.
This standard replaces GB 18248-2000 Seamless Steel Tubes for Gas Cylinder.
Compared with GB 18248-2000, it makes the main changes to the following technical
contents.
— Modify the scope of the standard;
— Modify the size tolerance of steel tubes;
— Adjust P and S content requirements of steel. Add 2 designations of 34CrMo4 and
30CrMnSiA;
— Modify the steel smelting methods;
— Add the thermal expansion tabulation method. Modify the delivery status of steel
tubes;
— Delete the macroscopic examination;
— For steel tubes made by rolling (forging) tube billet, inspection performance of
non-metallic inclusions is changed from “on tube billet” to “on steel tubes”. At the
same time, modify the inspection requirements of non-metallic inclusions of steel
tubes according to GB/T 10561;
— Add quality requirements of inner and outer surfaces straights of steel tubes;
— Modify the longitudinal mechanical property data measured from the samples that
are made by the steel tube heat-treated billet. And the required value is changed to
be reference value, as listed in Appendix B.
Annex A and Annex B of this standard are informative.
This standard was proposed by China Electrical Equipment Industrial Association.
The Standard shall be under the jurisdiction of the National Steel Standardization
Technical Committee.
Drafting organizations of this standard. Baoshan Iron and Steel Co., Ltd., Metallurgical
Industry Information Standards Institute, Panzhihua Iron and Steel Group Chengdu Iron and
Steel Co., Ltd., Tianjin Pipe Group Corporation, Hunan Hengyang Steel Tube (Group) Co.,
Ltd., and Jiangsu Zhenda Steel Tube Group.
Main drafters of this standard. Xu Qing, Wu Dongxing, Yu Chengfeng, Zhang Shuhua,
Huang Ying, Yan Ru, An Jianbo, Zhao Bin, Li Jinling, and Li Qi.
The previous version replaced by this standard is.
— GB 18248-2000.
Seamless steel tubes for gas cylinder
1  Scope 
This standard specified the size, shape, weight, technical requirements, test methods,
inspection rules, packaging, marking and quality certification of seamless steel tubes for
gas cylinder and energy accumulator shell.
This standard applies to seamless steel tubes for manufacturing gas cylinder and energy
accumulator shell.
2  Normative References 
The articles contained in the following documents have become part of this standard when
they are quoted herein. For the dated documents so quoted, all the modifications
(excluding corrections) or revisions made thereafter shall not be applicable to this
standard. For the undated documents so quoted, the latest editions shall be 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 223.11 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 223.14 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 223.17 Methods for chemical analysis of iron steel and alloy. The
diantipyrylmethane photometric method for the determination of titanium 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 223.24 Methods for chemical analysis of iron, steel and alloy. The extraction
separation — The dimethylglyoxime spectrophotometric method for the determination
of nickel content
GB/T 223.26 Iron steel and alloy — Determination of molybdenum content — The
thiocyanate spectrophotometric method
GB/T 223.30 Methods for chemical analysis of iron, steel and alloy. The arsenazo Ⅲ
spectrophotometric method for the determination of zirconium content after separation
by p-bromomandelic acid
GB/T 223.40 Iron steel and alloy — Determination of niobium content by the
sulphochlorophenol S spectrophotometric method
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 Methods for chemical analysis of iron, steel and alloy. The flame atomic
absorption spectrophotometric method for the determination of nickel 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 223.62 Methods for chemical analysis of iron, steel and alloy. The butyl acetate
extraction photometric method for the determination of phosphorus content
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy. The sodium
(potassium) periodate photometric method for the determination of manganese content
GB/T 223.64 Iron steel and alloyed - Determination of manganese content — Flame
atomic absorption spectrometric 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
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 223.76 Methods for chemical analysis of iron, steel and alloy The flame atomic
absorption spectrometric method for the determination of vanadium content
GB/T 223.78 Methods for chemical analysis of iron, steel and alloy-Curcumin
spectrophotometric method for the determination of boron content
GB/T 228-2002 Metallic materials — Tensile testing at ambient temperature (eqv ISO
6892.1998)
GB/T 229-1994 Metallic materials — Charpy notch impact test (eqv ISO 148.1983 and ISO
83.1976)
GB/T 241-2007 Metal materials — Tube — Hydrostatic pressure test
GB/T 2102-2006 Acceptance packing marking and quality certification of steel pipe
GB/T 2975-1998 Steel a...