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1、 The classification of the steel Insert the video classification of steel Our country steel number shows the method Chinese phonetic alphabet+chemical element symbol +Arabic numerals Annotation:(1)Chemical elements in steel numbers are represented by international chemical symbols,such as Si,Mn,Cr,e
2、tc(2)The product name,use,smelting and pouring method,etc.,are generally expressed in the abbreviation of Chinese pinyin（3)The content of main chemical elements in steel(%)is expressed in Arabic numerals Carbon structureal steel Q-Represents the yield point of the steel,the following number represen
3、ts the yield point value，units：MPa 1 The steel number may be followed by a symbol indicating the quality grade and deoxidation method The quality grade symbols are A,B,C and D respectively 2 Grade A:highest S and P content,low quality grade Q+number+quality grade symbol +deoxidation method symbol St
4、ands for boiling steel F Represents semi-killed steel b Represents killed steel z Stands for s p e c i a l killed steel TZ Deoxidation method symbol The killed steel may not be marked,that is,Z and TZ may not be marked.Q235-AF：Class A boiling steel with yield point 235Mpa Carbon structureal steel Fo
5、r example,bridge steel and Marine steel are basically represented by carbon structural steel.special purposes Carbon structureal steel The grade is expressed in two digits as the ten thousandth digit of the average carbon content of steel Carbon constructional quality steel 20 steel means high quali
6、ty carbon steel with an average carbon content of 0.20%Carbon constructional quality steel 08 steel represents an average carbon content of 0.08%Tool carbon steel It is mainly used for manufacturing manual tools,machine tools,molds and so on The steel number is prefixed with T to avoid confusion wit
7、h other steel classes The number in the steel number indicates the carbon content,expressed as a few thousandths of the average carbon content.For example,T8 means an average carbon content of 0.8%For high manganese content,mark Mn at the end of the steel number,such as T8Mn“Mn”，“T8Mn”The phosphorus
8、 and sulfur content of high quality carbon tool steel is lower than that of ordinary high quality carbon tool steel.The letter A is marked at the end of the steel number to show the difference,for example,T8MnA.Tool carbon steel T8MnA sternpost rudderstock bearing pintle cable lifter In actual produ
9、ction,some large parts with complex shapes and high requirements for comprehensive mechanical properties,which are difficult to be formed by forging and rolling method,are usually made of cast steel ZG 200400 Said cast stee The minimum yield strength is 200Mpa Minimum tensile strength 400Mpa The bra
10、nd name is ZG,the Chinese phonetic prefix of cast steel Carbon cast steel Structural steel for hull According to the requirements of classification society construction specifications for the production of steel hull structure,often as a special steel order,production,sales,generally including ship
11、plate,steel,etc Marine and ocean engineering structural steel of general strength High strength structural steel for Marine and ocean engineering Structural steels for ultra-high strength ships and ocean engineering Structural steel for hull Impact test performance at+20 is required Grade A Impact t
12、est performance at 0 is required Grade B Impact test performance at-20 is required Grade D Impact test performance at-40 is required Grade E Structural steel for hull Marine and ocean engineering structural steel of general strength Structural steel for hull The chemical composition and mechanical p
13、roperties of general strength hull structural steel are roughly equivalent to Q235 steel Structural steel for hull Steel for high strength ships and Marine structures With high mechanical properties,the toughness at-40 is not less than 50%of the normal temperature,to prevent fracture accidents and b
14、rittle fracture at low temperature,to ensure the requirements of the ship unlimited navigation area Structural steel for hull With excellent processing and welding performance,to a variety of specifications of the profile or plate supply Structural steel for hull Steel for ultra-high strength ships
15、and Marine structures The refined grain treated killed steel is delivered in quenched and tempered condition special steel stainless steel cryogenic steel clad sheet steel Special performance steel:steel with special physical and chemical properties,used to manufacture in addition to certain mechani
16、cal properties,but also required to have special performance of the zero component.stainless steel：Steel that can resist atmospheric corrosion is called stainless steel Steel that can resist atmospheric corrosion is called stainless steel：Steel resistant to corrosion in some acid,alkali,salt and oth
17、er chemical media Special steel Stainless steel includes stainless steel and acid resistant steel These two kinds of steel are commonly known together as stainless steel这两种 Austenitic stainless steel Austenitic stainless steel:steel with 17-19%chromium and 8-11%nickel Austenitic stainless steel The
18、steel is heated to 1100 and then cooled by water,so that the carbides are dissolved in the austenite obtained at high temperature,and then the single-phase austenite structure is obtained at room temperature by fast cooling Austenitic stainless steel has good corrosion resistance Good cold and hot p
19、rocessing and weldability The working temperature of the component shall not be lower than-165 The advantages of austenitic stainless steel Application of austenitic stainless steel It is widely used in the manufacture of some equipment and pipes which require corrosion resistance in ships definitio
20、n：Austenitic ferrite duplex stainless steel The ferrite phase and austenite phase account for half in the tissue,and the minimum phase content may be up to 30%in general In the case of low carbon content,the content of Cr is 18%28%,and the content of Ni is 3%10%In terms of corrosion resistance Espec
21、ially in the harsh medium environment,such as seawater,the corrosion resistance of duplex stainless steel is significantly better than ordinary austenitic stainless steel Duplex stainless steel is widely used The working temperature of the component is 0-300 Aryogenic steel The equipment and vessels
22、 must be made of low-temperature steel with special properties 运输天然气船舶 运输石油船舶 石油化工设备 Definition 低温用钢 Classify Low temperature steel for ferritic type,low temperature steel for austenite Low temperature steel:steel used at low temperature from-20 to-196 Cryogenic or ultra-cryogenic steel:steel used a
23、t low temperatures below-196 Clad sheet steel Composite steel plate:refers to the plate consisting of a base material and a thin layer(coating metal)integrated on one or both sides of it A sheet consisting of a base material and a thin layer(coating metal)bonded integrally on one or both sides of it
24、 The base material of composite steel plate is usually common carbon steel or carbon manganese steel plate,and the composite layer has stainless steel,titanium alloy,copper alloy,aluminum alloy and resin They give new features and functions to steel plates and are a class of economic steels Clad sheet steel Thanks for watching