中外碳素结构钢对照翻译.docx

1、中外碳素结构钢对照翻译The comparison of chemical composition and physical property of carbon structural steel manufactured in China and Britain1.General introduction1.1Manufacturing of carbon structural steel has more than 80 years history in China. It was smelted by Martin initially and then by converter or e

2、lectrical furnace, converter steel is developed from side blown converter to oxidative converter. In general, China has already accumulated mature smelting operation experience and quality of the products has been good enough to compare with foreign corresponding steel grade. For example, both physi

3、cal property and chemical composition of steel Q235 (made in China) was similar with foreign products, such as steel A36 (made in USA), steel CT-3 (made in Russia), steel SS41, SM41 (made in Japan), steel 43A-C(made in Britain), steel Fe360 (made in Europe), steel ST-37 (made in Germany and Austria)

4、. 2.General situation of carbon structural steel in China2.1According to the difference of carbon content, carbon structural steel can be classified into low carbon steel, medium steel and high carbon steel. Generally speaking, the one with 0.03%0.25% carbon content is called low carbon steel; the o

5、ne with 0.26%0.60% carbon content is called medium steel; the one with 0.60%2% carbon content is called high carbon steel. In building structure, low carbon steel is chiefly used.2.2Carbon structural steel is extensively used due to it was easy to smelt, with low cost and various good handling chara

6、cteristics. Steel Q235 has a better performance in strength, machining and welding properties. It is frequently used in industry and civil architecture, and it is also the large-tonnage steel grade manufactured in China.2.3Classification and property of carbon structural steel is shown as following:

7、2.3.1In GB/T700-88“carbon structural steel”, according to carbon and manganese content and yield point grade, and the hierarchy arranged from low to high, Carbon structural steel is classified into five grades. There are also quality grades classified in most grades and each grade has specified deox

8、idation method. Detailed see table2-1. The most common used one is Steel Q235.Carbon structural steel grades Table 2-1Steel gradeQuality grade Deoxidation measuresDeclaration Q195-F、b、ZSteel grade is composed of four parts in sequence as: letter represented yield point, numeric value of yield point,

9、 quality grade symbols and deoxidation method.For instance: Definition of each symbol in Q235-B-F is: Q- first letter in Chinese phonetic of“yield point”(屈) A,B,C,D individually is quality grade F- first letter in Chinese phonetic of“boiling steel”(沸) B- first letter in Chinese phonetic of“semikille

10、d steel”(半) Z- first letter in Chinese phonetic of“full killed steel”(镇) TZ- two letters in Chinese phonetic of “speical full killed steel”(特镇)Q215AF、b、ZBQ235AF、b、ZBCZDTZQ255AZBQ275-Z2.3.2 Carbon structural steel is smelted by oxidation oven, Martin or electrical furnace, unless special requirement

11、from demanding party(marked in contract ), smelting method is generally determined by supplier.2.3.3 Carbon structural steel is generally delivered under hot rolling (including controlling rolling) condition according to demanding partys requirement, through agreement of both sides, it can also be d

12、elivered under normalizing treatment condition (except for grade A steel)2.3.4 Roll down various grade B steel with boiling steel, its thickness (diametral) is generally not more than 25mm2.3.5 Carbon structural steels chemical composition (melting analysis ) should comply with specification in tabl

13、e2-2.2.3.6 Carbon structural steels mechanical property should comply with specification in table 2-3(tensile and impact test) and table 2-4(cold bend test).2.4 In tensile and impact test, samples of steel plate and band should adopt from the cross section, elongation of 1% lower than table2-3 is al

14、lowed; samples of structural section should adopt from longitudinal direction.2.5 Cold bend test of various grade A steel should be proceeded when demanding party requires. When cold bend test is qualified, the upper limit of tensile strength is no need to be as one of the delivery conditions.Carbon

15、 conformation steels chemical constitution Table 2-2Steel gradeQuality gradeChemical constitution Deoxidation methodCMnSiSPNo greater thanQ1950.060.120.250.500.30 0.050 0.045 F、b、ZQ215A0.090.150.250.550.30 0.050 0.045 F、b、ZB0.045 Q235A0.140.220.300.650.30 0.050 0.045 F、b、ZB0.120.200.300.700.045 C0.180.350.800.040 0.040 ZD0.170.035 0.035 TZQ255A0.180.280.400.700.30 0.050 0.045 ZB0.045 Q2750.280.380.500.800.35 0.050 0.045 ZNotes: The upper content l