华夏沪深300700(700 v2)

2021年4月27日发(作者：2020年康恩贝目标股海默科技股票 价分析@只白不也不美@不绿不是康@P)

ICS 77.140.45
H 40

National standard of the People's Republic of China
GBT 700-2006
中超控股 Replace GBT 700-1988





碳素|敦煌种业股票结构钢
Carbon structural steels

(ISO 630:1995, Structural steels –
Plates, wide flats, bars, sections and profiles, NEQ)















Issue date: Nov 1, 2006 Implementation date: Feb 1, 2007

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 (SAC)

Foreword

This standard is not equivalent to ISO 友邦华泰基金管理有限公司 630:1995 Structural Steels in the respect of consistency. The
main differences between the two standards are as follows:
- No grades are specified corresponding to the yield strength 今日停牌 levels of 185Nmm
2
and
355Nmm
2
;
- Grades Q195 and Q215 are specified corresponding to levels 195Nmm
2
and 215Nmm
2
;
- The phosphorus contents of class A steels of Q235 and Q275 are decreased by 0.005%;
The thickness of Q235 class B steel is divided into two levels according to the deoxidization
method and the carbon content is 0.20% in both levels;
- Q235 class B steel of which the thickness is smaller than 25mm may not be subject to test
with the consent of the buyer if the supplier can ensure that the impact absorbed energy is up
to standard;
- The yield strength of Q275 steel 中国六爻 of which the thickness is bigger than 80mm~100mm is
increased by 10Nmm
2
;
- Cold bending test is added;
- Detailed batching rules are specified according to the situation 内蒙君正股吧of China.
This standard replaces GBT 700-1988 Carbon Structural Steels and has the following changes in
comparison with GBT 700-1988:
- Semi-killed steel is cancelled in “deoxidization method”;
- Grades Q255 and Q275 in GBT 700-1988 are cancelled;
- Grade E275 in ISO 630:1995 is newly added and changed to the new grade Q275;
- The lower limits of carbon and manganese contents of each grade are cancelled, and the upper
limit of manganese content is increased;
- The limit of silicon content of rimmed steel and killed steel is cancelled;
- silicon content is changed from 0.30% to 0.35% (except for Q195);
600620股票 - The phosphorus and sulphur contents of grade Q195 are decreased respectively from 0.045%
and 0.050% to 0.035% and 0.040%;
- The regulation for the elongation after fracture of the 双禧b thickness (or diameter) level of not
bigger than 16mm is cancelled;
- “The upper limit of the tensile strength of wide strip steel (including sheared steel plate) is not
used as a term of delivery” and “Q235 class B steel of which the thickness is smaller than
25mm may not be subject to test with the consent of the buyer if the supplier can ensure that
the impact absorbed energy is up to standard” are added in the footnotes of Table 2;
- The regulation for the nitrogen content in the steel is modified;
- The regulation for impact test is modified and the figure of the minimum impact absorbed
energy of the samples 金鼎价值基金of which the thickness is 5mm-10mm is added;
- The basis of batching is changed from “the same furnace and kettle number” to “the same
furnace number” and the limitation for the 大九股牛 furnace number of mixed batch is cancelled.
Annex A of this standard is normative.
This standard was proposed by China Iron and Steel Association.
This standard is under the jurisdiction of National Technical Committee for Steel Standardization.
This standard was drafted by China Metallurgical Information & Standardization Institute, Capital
Iron and Steel Company, Handan Iron & Steel Group and Benxi Iron & Steel Group Co., Ltd.

The main drafters of this standard are Tang Yifan, Luan Yan, Wang Liping, Sun Ping, Zhang
Xianfeng and Dai Qiang.
This standard was first issued in January 1965, first revised in October 1979 and revised for the
second time in June 1988.

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