钢结构基本原理课件 (5).ppt

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1、Types of Structural Steel in ChinaBasic Principles of Steel Structures 2.3.1 Classifications of Steel in China 2.3.2 Carbon Structural Steel 2.3.3 Low Alloy Structural Steel2.3.4 High-quality Carbon Structural Steel2.3.5 Steel Plate for Building Structure2.3.6 Weathering Steel and Fire-resistant Ste

2、el 2.3.1 Classification of Steel in China According to the deoxygenation method1.1.（1）Boiling steel（2）Killed steel1 1Code:F.2 2Boiling steel has gradually withdrawn from the market.1 1Code:Z.2 2Killed steel is the most steel product on the market.2.3.1 Classification of Steel in China According to t

3、he deoxygenation method1.1.（3）Semi-killed steel（4）Special killed steel1 1Code:b.2 2The market share of semi-killed steel is very small.1 1Code:TZ.2 2The market share of special killed steel is also very small.2.3.1 Classification of Steel in China 2 2.（1）Rolled steel（2）Forged steel1 1Hot-rolled stee

4、l and cold-rolled steel.2 2Hot-rolled steel use in civil engineering construction commonly.1 1Forged steel is rarely used in civil engineering construction.2.3.1 Classification of Steel in China According to the molding method2 2.（3）Cast steel 1 1The price of cast steel is higher.2 2Cast steel uses

5、in complex parts of the steel structure generally.2.3.1 Classification of Steel in China According to carbon content and chemical composition3.3.（1）Carbon steel（2）Low alloy steel1 1Although there are five grades of carbon steel,only one grade,as structuralSteel,can use in the building structure.1 1T

6、here are five grades of low alloy steel,and four grades can use in the building structure.2.3.2 Carbon Structural Steel Steel grades of carbon structural steel1.1.（1）Q195,Q215,Q235,Q255,and Q2751 1Although there are five grades of carbon steel,only one grade can usein the building structure.2 2Only

7、Q235 can use as structural steel.2.3.2 Carbon Structural Steel Quality levels of carbon structural steel2.2.（1）A,B,C,and D 1 1Level A:Impact toughness is not required;the cold-bend test only carriesout when the buyer requires.2 2Level B:The impact toughness at 20 C and cold-bend tests are required.2

8、.3.2 Carbon Structural Steel Quality levels of carbon structural steel2.2.（1）A,B,C,and D 3 3Level C:Requires 0 C impact toughness and cold-bend tests are required.4 4Level D:Requires-20 C impact toughness and cold-bend tests are required.2.3.3 Low Alloy Structural SteelSteel grades of low alloy stru

9、ctural steel1.1.（1）Q295,Q345,Q390,Q420,and Q4602 2The Q345,Q390,Q420,and Q460 can use as structural steel.1 1There are five grades of Low alloy steel,and four grades can use in the building structure.2.3.3 Low Alloy Structural SteelQuality levels of low alloy structural steel2.2.（1）A,B,C,D,and E 1 1

10、Level A:Impact toughness is not required;the cold-bend test only carriesout when the buyer requires.2 2Level B:The impact toughness at 20 C temperature and cold-bend testsare required.2.3.3 Low Alloy Structural SteelQuality levels of low alloy structural steel2.2.（1）A,B,C,D,and E 3 3Level C:Requires

11、 0 C impact toughness and cold-bend test.4 4Level D:Requires-20 C impact toughness and cold-bend test.5 5Level E:Requires-40 C impact toughness and cold-bend test.2.3.4 High-quality Carbon Structural SteelWhat is high-quality carbon structural steel?1.1.（1）Manufacturing method1 1To make high strengt

12、h bolts of class 8.8.1 1High-quality carbon structural steel is carbon steel after heat treatment.（2）Application range2.3.5 Steel Plate for Building StructureHigh-performance building structural steel(GJ steel)1.1.（1）Grades of high-performance building structural steel 1 1B,C,D,and E.1 1Q235GJ,Q345G

13、J,Q390GJ,Q420GJ,and Q460GJ.（2）Quality levels of high-performance building structural steel 1 1The Standard for design of Steel Structures GB50017 only recommends Q345GJ.（3）Application 2.3.6 Weathering Steel and Fire-resistant Steel Weathering steel(NH steel)1.1.（1）Manufacturing method and purpose1 1

14、During the steel smelting process,a small number of specific alloy elementsadded to form a protective layer on the surface of the metal substrateto improve the resistance to atmospheric corrosion.（2）Application1 1The Standard for design of Steel Structures GB50017 recommends Q235NH,Q355NH,and Q415NH.2.3.6 Weathering Steel and Fire-resistant Steel Fire-resistant steel1.1.（1）Manufacturing method and purpose1 1Add a small number of precious metals to the steel to make it have high-temperature resistance,especially high strength at high temperatures.（2）Application1 1Few engineering applications.