What is SUS420JI stainless steel?
SUS420(2Cr13) steel has high toughness, high hardness, air-cooled hardened high chromium tool steel, better hardness and toughness than SKD steel, high mirror surface, high corrosion resistance. The size change of heat treatment is small.
SUS420JI steel should belong to stainless steel from the classification, more accurate classification should be attributed to martensitic stainless iron, mainly used for mechanical processing, better than normal stainless steel cost performance, so in the case of low corrosion resistance requirements, has been more widely used. SUS420JI has better mechanical properties and machinability after quenching treatment, and its microstructure is Martensite shape.
The corresponding brand of SUS420JI is as follows:
1. Corresponding standard brand: GB/T1220-2007;
2, corresponding to the Japanese brand: SUS420JI;
3, corresponding to the German brand: X20CR13/1.4021;
4, corresponding to the American brand: 420
2Cr13 (new number: 20Cr13) Standard: GB/T 1220-2007
Characteristics and application: high hardness and good corrosion resistance under quenching state. Used as turbine blades. 2Cr13 density 7.75g/cm3 2Cr13 quenching hardness: generally, the quenching temperature of 2Cr13 is 980 ~ 1050℃, the hardness of oil quenching at 980℃ is significantly lower than that at 1050℃, the hardness of oil quenching at 980℃ is 45 ~ 50HRC, and the hardness of oil quenching at 1050℃ is 2HRC higher. However, the microstructure obtained after quenching at 1050℃ is coarser and more brittle. It is recommended to use 1000℃ heating quenching can get better microstructure and hardness. 2Cr13 Martensitic stainless steel, preheated for welding. And Q235 austenitic stainless steel welding rod without preheating, such as A302.A307 can be. Weld dilution rate is controlled during welding, welding without swing, and small current is used.
2Cr13 welding material can be selected:
1. Atmospheric corrosion resistance G202,G207, need to preheat 150-300 degrees, after welding 700-730 degrees tempering;
2. Resistance to organic acid and heat resistance: G211, need to preheat 150-300 degrees;
3. Good plasticity: A102 A107, A202, A207, A302, A307, repair welding preheating, thick big preheating
2Cr13 chemical composition
Carbon C: 0.16 ~ 0.25
Si Si: 1.00 or less
Manganese Mn: 1.00 or less
S: sulfur 0.030 or less
P P: 0.035 or less
Chromium Cr: 12.00 ~ 14.00
Nickel Ni: allowable content ≤0.60
Mechanical properties of
Tensile strength σ B (MPa) : quenched temper,≥640
Condition yield strength σ0.2 (MPa) : quenched and tempered,≥440
Elongation δ5 (%) : quenching and tempering,≥20ψ (%)
quenched and tempered,≥50
Impact energy Akv (J) : quenching and tempering,≥63
Hardness: Annealing,≤223HB; Quenching and tempering,≥192HB
Heat treatment specification and metallographic structure
Heat treatment
1) Annealing, slow cooling at 800 ~ 900℃ or fast cooling at about 750℃;
2) quenching, oil cooling at 920 ~ 980℃;
3) Tempering,600 ~ 750℃ fast cooling.
Metallographic structure: The structure is characterized by Martensite type.
Delivery status:
Generally, the goods are delivered in the condition of heat treatment, and the type of heat treatment is indicated in the contract. If it is not indicated, the goods will be delivered without heat treatment.
Main uses:
1, mechanical structure parts, engine exhaust pipe, boiler combustion chamber, burner.
2, building exterior decoration materials, car parts, cold and hot water supply equipment.
3, used in grain boundary corrosion resistance of chemical, coal, oil industry outdoor open-air machine, building materials heat-resistant parts and parts with difficulty in heat treatment.
Welding materials:
1, atmospheric corrosion resistance G202, G207, need to preheat 150-300 degrees, after welding 700-730 degrees tempering;
2, organic acid resistance and heat resistance G211, need to preheat 150-300 degrees;
3, good plasticity: A102, A302, A307, repair welding preheating, thick parts preheating.
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1. Stock view
2. Processing and Technology for heating processing
Cutting processing Quenching Tempering Annealing
3. Quality testing
1. Inspection Institution
Shanghai Fuda Testing Technology Group Co., LTD. Nanjing Branch
Focus on analysis, testing, testing, r & D four service areas. Analysis fields include component analysis, formula analysis, failure analysis, structure analysis, methodology development and validation, raw material quality control/evaluation, consistency evaluation, feature analysis and other directions; The testing field involves physical and chemical properties testing, toxic and harmful substances testing, flame retardant performance testing, reliability testing and other directions; The testing field involves energy spectrum, electron microscope, spectrum, chromatography, mass spectrometry and other directions; The r&d field involves formula development, formula upgrading, formula customisation, cooperative research and development and other directions.
Beijing Zhongke Chemical Technology Research Institute
It is a chemical technology research institution based on scientific research and testing. They adhere to paying equal attention to basic research and applied research, and combining applied research and technology transformation, developing into a comprehensive research institute characterised by "task-oriented disciplines". Approved by the relevant national departments, the company has become a third-party analysis and testing technology service unit, and has obtained CMA qualification certification. It has carried out research and development and design, analysis and testing, test and verification, generic processing, information and intellectual property services, providing public services for innovation of technology-based enterprises. Supported by the government innovation Fund, the institute has been awarded as a national high-tech enterprise.
2.Inspection Machining
Metal composition testing machine Computerised Materials Torsion Testing Machine Metal bar composite rod bending tensile strength testing machine
3. Material test certificate
4. Packaging
In the steel export activities, we also need to pack the steel to prevent the steel from being scattered in the transportation process. In the hoisting process, it is necessary to lift the steel. So steel is very necessary in the export process. Below is the picture of packaging：
According to the requirements of the state of steel materials, the use of binding, bare, frame, pallet.
Packing standard: according to the following national standard requirements (the parts beyond the requirements will be specified separately)
GB／T191 packaging-pictorial marking for handling of goods
GB／T4857 (all parts) basic test for transport packages
GB／T4879 rustproof packaging
GB／T5048 damp-proof packing
GB／T7350water-proof packing
GB／T8166 Package cushioning design
GB/T4892-1996 Hard straight square transport packaging size series
GB/T13201-91 Cylinder transport package size series
GB/T16471-1996Design and make the size limit of transport package
5. Logistic
By SEA By Air By Express
1. Company profile
Luoyue Precision Metal established in 2018, is a leading Stockists and global distributor for Metal Raw Materials like Steel/Aluminum/ Stainless steel/Copper/ Nickel Rods, Bars, Plates, Sheets,Pipes, fittings, fasteners, Inconel alloys, Wire and Wire-Mesh to customers from aerospace, automotive, electronics, precision manufacturing, ordnance, marine, shipbuilding, oil & gas, power plant and construction.
The company has a high-precision, high-efficiency modern processing site, CNC machine tools and complete testing and inspection technology, and introduces international advanced technologies.
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