GBT 700 碳素结构钢ENWord文件下载.docx

1、s Republic of ChinaGB/T 700-2006 WordStr GB/T 700-1988碳素结构钢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, 2007Issued by: General Administration of Quality Supervision, Inspection and Qu

2、arantine of the Peoples Republic of ChinaStandardization Administration of the Peoples Republic of China （SAC）ForewordThis standard is not equivalent to ISO 630:1995 Structural Steels in the respect of consistency. The main differences between the two standards are as follows:-No grades are specifie

3、d corresponding to the yield strength levels of 185N/mm2 and 355N/mm2;-Grades Q195 and Q215 are specified corresponding to levels 195N/mm2 and 215N/mm2;-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 a

4、ccording 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 strengt

5、h of Q275 steel of which the thickness is bigger than 80mm100mm is increased by 10N/mm2;-Cold bending test is added;-Detailed batching rules are specified according to the situation of China.This standard WordStrs GB/T 700-1988 Carbon Structural Steels and has the following changes in comparison wit

6、h GB/T 700-1988:-Semi-killed steel is cancelled in “deoxidization method”;-Grades Q255 and Q275 in GB/T 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 li

7、mit 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）;-The phosphorus and sulphur contents of grade Q195 are decreased respectively from 0.045% and 0.050% to 0.035% and 0.040

8、%;-The regulation for the elongation after fracture of the 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 thicknes

9、s 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 mod

10、ified and the figure of the minimum impact absorbed energy of the samples 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 furnace number of mixed batch is cancelled.Annex A

11、 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 S

12、teel 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

13、 in June 1988.1 ScopeThis standard specifies the grade, dimension, shape, weight and permissible deviation, technical requirements, test methods, inspection rules, packing, marking and quality certificate of carbon structural steel.This standard is applicable to the structural hot rolled steel sheet

14、s, steel strips, sectional steels and bar steels generally used for welding, riveting and bolting engineering in delivery state.The chemical composition specified by this standard is also applicable to steel ingots, continuous casting billets, steel billets and their products.2 Normative referencesT

15、he following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments （not including corrections） to, or revisions of, any of these publications do not apply. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below.For undated references, the latest edition of the normative document referred to applies.GB/T 222-2006Permissible tolerances for chemical composition of s