1Cr18Ni9Ti wire mesh Introduction to Characteristics and Applications
2024-07-29 16:18:40
wiremeshxr
1Cr18Ni9Ti wire mesh Introduction to Characteristics and Applications
1Cr18Ni9Ti wire mesh is also known as 1Cr18Ni9Ti filter mesh, 1Cr18Ni9Ti woven mesh, 1Cr18Ni9Ti screen, 1Cr18Ni9Ti square hole mesh, 1Cr18Ni9Ti punching plate, 1Cr18Ni9Ti diamond mesh, 1Cr18Ni9Ti metal wire mesh, 1Cr18Ni9Ti filter mesh, etc.
Types of 1Cr18Ni9Ti wire mesh: 1Cr18Ni9Ti woven mesh, 1Cr18Ni9Ti punched mesh, 1Cr18Ni9Ti steel plate mesh, 1Cr18Ni9Ti welded mesh, 1Cr18Ni9Ti crimped mesh, 1Cr18Ni9Ti filler mesh, 1Cr18Ni9Ti wire mesh demister, 1Cr18Ni9Ti plain mesh, 1Cr18Ni9Ti twill mesh, 1Cr18Ni9Ti stainless steel mesh belt, etc.
1Cr18Ni9Ti wire mesh: 1-3200 mesh;
1Cr18Ni9Ti wire mesh weaving methods: plain weave, twill weave, bamboo flower weave, plain Dutch weave, twill Dutch weave, reverse Dutch weave, welding, punching and other methods.
1Cr18Ni9Ti wire mesh width: 0.1-18 meters wide;
1Cr18Ni9Ti wire mesh filter accuracy model: GFW, GF1W, GF2W, GF3W;
1Cr18Ni9Ti wire mesh production implementation standards: GB/T5330-2003, GB/T5330-1985, GB/T18850-2002, GB/T 19628.2-2005, HB1862-1993, GB/T 10611-2003, GB/T 17492-2012, QB/T 2031-1994, QB/T 1925.3-1993, GBT13307-2012, GB/T 5330.1-2000, GB/T 5330.1-2012;
1Cr18Ni9Ti is collectively referred to as: 1Cr18Ni9Ti, 10Cr18Ni9Ti, S32160;
1Cr18Ni9Ti corresponds to the following brands in different countries:
Corresponding German brand: X6CrNiTi18 10
Corresponding British brand: 321S20
Corresponding French brand: Z10CNT18-11
Corresponding Japanese brand: SUS 321
1Cr18Ni9Ti standard: GB /T 1220-1992, JG /T 3030-1995, GB /T 4356-2016, GJB 2294A-2014
1Cr18Ni9Ti can be used at a high temperature of 700℃ because it is both an austenitic stainless steel and a widely used austenitic heat-resistant steel. However, it is best not to exceed 750℃. Its heat treatment is a solution treatment, that is, heating to above 1000℃, keeping warm for a certain period of time, then quenching with water, and then aging at 60~100℃ higher than the use temperature.
1Cr18Ni9Ti is a representative product of backward stainless steel production technology. With the improvement of stainless steel production technology in various countries around the world, it has become an obsolete product. In view of my country's national conditions, it is still retained in some occasions, but it is not a recommended steel grade. Those who really need to use 1Cr18Ni9Ti can also change to 06Cr18Ni11Ti (0Cr18Ni10Ti).
Whether to use 06Cr18Ni11Ti (0Cr18Ni10Ti) with Ti added or 06Cr19Ni10 (0Cr18Ni9) without Ti added depends on whether the operating environment of the stainless steel is an intergranular corrosion environment.
1Cr18Ni9Ti is used in outdoor open-air machines in the chemical, coal, and petroleum industries that require high resistance to intergranular corrosion, heat-resistant parts for building materials, and parts that are difficult to heat treat, such as:
1. Petroleum waste gas combustion pipeline;
2. Engine exhaust pipe;
3. Boiler shell, heat exchanger, heating furnace parts;
4. Silencers for diesel engines;
5. Boiler pressure vessel;
6. Chemical transport vehicles;
7. Expansion joint;
8. Spiral welded pipes for furnace pipes and dryers;
chemical composition:
Carbon C: ≤0.12%.
Silicon Si: ≤1.00%.
Manganese Mn: ≤2.00%.
Sulfur S: ≤0.030%.
Phosphorus P: ≤0.035%.
Chromium Cr: 17.00～19.00%.
Nickel Ni: 8.00～11.00%.
Titanium Ti: 5 (C-0.02) ~ 0.80%. Mechanical properties
Tensile strength σb (MPa): ≥520
Conditional yield strength σ0.2 (MPa): ≥205
Elongation δ5 (%): ≥40
Sectional shrinkage ψ (%): ≥50
Hardness: ≤187HB; ≤90HRB; ≤200HV
Heat treatment specifications and metallographic structure
Heat treatment specifications:
1) Solution treatment at 920-1150℃ and rapid cooling;
2) Stabilization treatment can be carried out according to the purchaser's requirements. The heat treatment temperature is 850-930℃, but it must be specified in the contract.
3) The solution temperature cannot exceed 1066°C. If it exceeds this temperature, stabilization treatment must be carried out to prevent the precipitation of chromium.
1Cr18Ni9Ti is a typical 18-8 type austenitic stainless steel, which is formed by adding Ti element to 1Cr18Ni9. The addition of Ti is mainly to prevent intergranular corrosion of the alloy at the sensitization temperature of about 500~800°C in the future. Ti element is a strong carbide-forming element. In austenitic stainless steel, local Cr element and C react to form carbides, resulting in Cr deficiency, which leads to intergranular corrosion. The addition of Ti forms TiC, which prevents the consumption of Cr and reduces the tendency of intergranular corrosion to a certain extent. Other grades such as 1Cr18Ni9Nb also use this principle.
1Cr18Ni9Ti has excellent resistance to uniform corrosion by oxidizing acids, but poor resistance to stress corrosion and pitting corrosion. This grade has good plasticity and toughness, a high work hardening rate, and cannot be strengthened by heat treatment. Strength can only be improved by cold working.
1Cr18Ni9Ti is widely used in the fields of aviation and aerospace, but this grade has inherent defects that cannot be solved. The carbide of alloy Ti is a phase with very high hardness. Its distribution in the matrix will cause defects and it is easy to crack during cold deformation. At the same time, for some products that require bright surfaces, the TiC embedded in the matrix will be exposed to the surface through processing, reducing the surface quality of the product. The distribution of Ti in the matrix has a great influence on the quality of the alloy. Some parts with uneven distribution of Ti elements are prone to intergranular corrosion. Many new versions of material standards have deleted this grade, such as GB1220-2007, GB4232-2019, etc., and the national military standard GJB 2295A-2006, although it includes this grade, also indicates that it is generally not recommended for use. This grade is used in large quantities in the aerospace field, but it is recommended to use 1Cr18Ni9 (302) or 0Cr18Ni9 (304) instead.
Similar grades of this brand include: American SAE30321, AISI321, Japanese SUS321;
Physical properties: Melting temperature range 1400~1425°C; the material is non-magnetic in solid solution state.
Chemical properties: Stable oxidation resistance in air and aviation fuel combustion products below 800-900°C. The alloy is prone to intergranular corrosion and can generally be stabilized by keeping it in the range of 850-900°C for 4-6 hours to reduce the tendency of intergranular corrosion.
Processing properties of materials: 1Cr18Ni9Ti cannot be heat-treated for strengthening. Heat treatment is generally only for solution treatment. The structure in the solution state is stable austenite, sometimes containing a small amount of delta ferrite. During cold deformation, part of the austenite is transformed into deformation martensite. Austenitic stainless steel has a tendency to intergranular corrosion and is generally not suitable to stay in the sensitization temperature range of about 600°C. This grade uses Ti to prevent intergranular corrosion. The solid solution temperature of the grade should be strictly controlled. When the temperature is low, the carbide of Cr is not fully dissolved, which will reduce the corrosion resistance. When the temperature is too high (above 1150°C), TiC dissolves in the austenite matrix in large quantities, causing Ti to lose the function of fixing C and easily produce intergranular corrosion. At the same time, too high a temperature will also increase the delta ferrite content and grain growth. Rapid cooling after solid solution treatment prevents the precipitation of carbides during cooling and reduces corrosion resistance. In order to improve the resistance to intergranular corrosion, stabilization treatment can be carried out at 850~900°C for 4h.
Application: 1Cr18Ni9T has a large number of applications, including various bolts, screws, studs, nuts, rivets, washers, pipe joints, clamps, etc. The standards cover national standards, military standards, aviation standards, aerospace standards and many corporate standards. The standards for selecting this grade are generally around 2000 or earlier.
Selection suggestions: Tensile strength of more than 500Mpa, with high oxidation resistance and uniform corrosion resistance, and good toughness, are recommended. 1Cr18Ni9 (302), 0Cr18Ni9 (304), 00Cr19Ni10 (304L) are recommended as replacements.
The surface treatment mainly includes chemical passivation (Ct.P), electrochemical polishing (ECP), cadmium plating (Ep.Cd) or silver plating (Ep.Ag), etc., which can be selected by the user according to the service environment.
①This standard specifies the dimensions, appearance, technical requirements, test methods, acceptance rules, packaging marks and quality certificates of stainless steel bars.
② This standard applies to hot-rolled and forged stainless steel bars with a size not exceeding 250mm, and its chemical composition also applies to ingots or billets.
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