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Anonymous users2024-02-061CR18Ni9Ti is not recommended for use in China and has been gradually eliminated.
The early researchers of stainless steel found that carbon was the main cause of the corrosion and damage of austenitic stainless steel grain boundaries, limited to the level of metallurgical equipment at that time, it was difficult to control the carbon to the following, and finally came up with the addition of Ti and Nb to the steel, so that it preferentially reacted with carbon, generated Tic and NBC, and fixed the carbon to prevent carbon from precipitating at the grain boundary to form Cr23C6, causing intergranular corrosion. Due to the high cost of NB, Ti-stabilized steel 1Cr18Ni9Ti was still dominant in stainless steels until the mid-seventies.
1Cr18Ni9Ti molten steel is viscous, and the surface quality of continuous casting billet is difficult to pass. Using die casting, the surface quality of the steel ingot is not good, and it must be peeled and regrinded, and the yield rate is very low. The finished steel contains TIN inclusions, low purity, poor surface polishing performance, and many broken wires.
By the end of the 60s of the 20th century, a breakthrough was made in stainless steel smelting technology, and AOD and VOD methods were widely used in steelmaking, and reducing the carbon in stainless steel was no longer a problem, so 1Cr18Ni9Ti was gradually replaced by low-carbon and ultra-low-carbon steel. In the seventies, the United States, Japan and other countries have eliminated 1Cr18Ni9Ti from the standard, although 0Cr19Ni11Ti (321) is retained, its output only accounts for the total, and the transition from titanium-containing stabilized steel to low-carbon and ultra-low-carbon steel has been successfully completed.
The production and application of stainless steel in China is relatively lagging behind, although in 1984 when the national standard GB1220-84 "stainless steel rod" was promulgated, 1Cr18Ni9Ti was listed as an unrecommended grade, but the dominance of 1Cr18Ni9Ti has not changed. Until 1995, with the development of the national economy, especially the intervention of joint ventures, the domestic market and the international market gradually converged, in just 5 or 6 years, China's austenitic stainless steel has completed the transition from titanium-containing stabilized steel to low-carbon and ultra-low-carbon steel. At present, except for a few traditional industries that still use 1Cr18Ni9Ti, 304 (0Cr19Ni9) and 316 (0Cr17Ni12Mo) have become the leading grades of stainless steel.
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Anonymous users2024-02-05There is no such thing!
The national standard for stainless steel seamless steel pipes is "Stainless Steel Seamless Steel Pipes for Conveying Fluids" GB T14976-1994 (instead of GB2270-80). Its common specifications are shown in the following table:
<> it should be noted that 1Cr18Ni9Ti is a stainless steel product in China, and there are no completely similar alternative materials in other countries, see the table below:
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Anonymous users2024-02-04<><1Cr18Ni9Ti is used in the field of chemical, coal, and petroleum industries with high requirements for grain boundary corrosiveness, and heat-resistant parts for building materials and parts with difficult heat treatment, such as:
1 .Petroleum exhaust gas combustion pipelines.
2 .Engine exhaust pipe.
3 .Boiler housings, heat exchangers, furnace components.
4 .Silencing parts for diesel engines.
5 .Boiler pressure vessels.
6 .Chemical transport trucks.
7 .Expansion joints.
8 .Spiral welded pipes for furnace pipes and dryers.
Chemical Composition Carbon C : Silicon Si: . Manganese mn: . Sulfur s : phosphorus p : chromium cr:. Nickel ni:.
Titanium ti: 5(. Mechanical properties.
Tensile Strength b (MPa): 520
Conditional yield strength (mpa): 205
Elongation δ5 (%40
Cross-sectional shrinkage 50
Hardness : 187HB; ≤90hrb;≤200hv
Heat treatment specifications and metallographic structure.
Heat treatment specifications: 1) Solid solution 920 1150 fast cooling; 2) According to the requirements of the buyer, the stabilization treatment can be carried out, and the heat treatment temperature is 850 930, but it must be specified in the contract. 3) The solution temperature should not exceed 1066, and if it does, it must be stabilized to prevent the precipitation of chromium.
Metallographic structure: The structure is characterized by austenite type.
Delivery status: generally delivered in a heat treatment state, and the type of heat treatment is indicated in the contract; If not indicated, it will be delivered in a non-heat-treated state.
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Anonymous users2024-02-03The national standard for 1CR18Ni9TI stainless steel seamless steel pipe is "Stainless Steel Seamless Steel Pipe for Conveying Fluids" GB T14976-1994
1Cr18Ni9Ti is mainly used for making acid-resistant containers and equipment linings, anti-magnetic instruments, medical devices, and has good intergranular corrosion resistance.
The chemical composition of 1Cr18Ni9Ti is shown in the following figure:
Carbon C:
Silicon si:.
Manganese mn: .
Sulfur s:
Phosphorus p:
Chromium cr:.
Nickel ni:.
Titanium ti:5*(c%).
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Anonymous users2024-02-02Very very share days from Google very covered.
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Anonymous users2024-02-01Stainless steel 1Cr18Ni9Ti is ordinary stainless steel. 1Cr18Ni9Ti is the content of Carbon1 Cr1, Cr18Ni9Ti, which represents Carbon, Chromium, Chromium, Nickel (%), respectively.
Chemical Composition: Carbon C : Silicon Si: Manganese Mn: ,Sulfur S: Phosphorus P: Chromium Cr: ,Nickel Ni: ,Titanium Ti:5(C.
The use of 1Cr18Ni9Ti in China is mainly concentrated in state-owned enterprises and military enterprises, and the main reason is that the C content of 304 is relatively low, so its hardness is relatively low, and the problem of locking sometimes occurs in the process of use.
1Cr18Ni9Ti is not easy to lock up because of its higher hardness. However, because the hardness of 1Cr18Ni9Ti is relatively large, it is more difficult to process cold piers. Therefore, the ** of 1Cr18Ni9Ti is more expensive than that of 304, and the processing cost is relatively high, so now it is generally mainly made of 304 material.
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Anonymous users2024-01-31304316 is an American Standard stainless steel grade.
The other two are Chinese stainless steel grades.
1Cr18Ni9Ti is equivalent to 321 in the US Standard
0Cr18Ni9Ti is equivalent to 304 in the US Standard
Generally, most of the products we use in our lives are 304 stainless steel, and you can go to see the commonly used daily necessities 316 with strong corrosion resistance, and most of them use marine chemicals.
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Anonymous users2024-01-30The former has the highest C content, and the latter has the highest C content.
They are all grades in the GB4237-1992 standard, and the latter has now been directly deleted, and now there is no such grade. The former is called 0cr18ni10ti in the standard.
The former has now been improved in the new GB24511 standard... It's called 06cr18ni11ti... The C content is the largest.
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Anonymous users2024-01-29Answer: 0Cr18Ni9Ti (old 321 corresponds to stainless steel) contains titanium that resists intergranular corrosion, has good resistance to intergranular corrosion and cold working stamping, has strong corrosion resistance to oxidizing acids (such as nitric acid), and also has certain corrosion resistance to alkaline solutions and most organic acids and inorganic acids.
Chinese name 0cr18ni9ti
Melting point 1398
Modulus of elasticity of density.
20℃)199gpa
Stainless steel 1Cr18Ni9Ti
Stainless steel 1Cr18Ni9Ti is an ordinary stainless steel (SUS321), and its structure class is austenitic type. 1Cr18Ni9Ti represents the content of carbon ( ), chromium (%), and nickel (%), respectively. It is a stainless steel material grade in China.
It is used to make acid-resistant containers and equipment linings, anti-magnetic instruments, and medical devices, and has good intergranular corrosion resistance.
Chinese name 1cr18ni9ti
Properties stainless steel.
Hardness : 187HB; ≤90hrb;200HV shrinkage
55% silicon si:
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Anonymous users2024-01-281Cr18Ni9Ti is a grade of national standard austenitic stainless steel, which has excellent resistance to uniform corrosion of oxidizing acids, but has poor stress corrosion resistance and pitting corrosion resistance. It has good plasticity and toughness, high work hardening rate, and cannot be strengthened by heat treatment, but can only be improved by cold working.
Chemical Composition:Carbon C:
Silicon Si: Manganese Mn:
Phosphorus p: sulfur s:
Chromium Cr: Nickel Ni:
Other: Titanium ti: 5 (
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Anonymous users2024-01-27What is the equivalent of 1Cr18Ni9Ti material: 1Cr18Ni9Ti is a stainless steel material, its chemical composition is: C, Si, Zhihong, Mn, P, S, Ni:
cr：，ti：。This material is equivalent to 304Ti stainless steel, and its main characteristics are good corrosion resistance, good processing performance and welding performance, and it is suitable for manufacturing high-temperature closed equipment, chemical equipment, marine equipment and medical equipment.
It should be noted that there are usually slight differences in the 1Cr18Ni9Ti material produced by different manufacturers, so the appropriate material should be selected according to the specific situation when using.
Since it is a time-traveling drama, it must meet the needs of the plot, generally there are more plots from modern times to ancient times, and they are all crossed inadvertently or accidentally, and they rarely carry anything with them, it is nothing more than a modern dress, if modern things frequently appear, it will make people feel nondescript and have a sense of goofing.
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Because there are a lot of countries and customs.
After using it, it loses the balance of the game.
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