316L Stainless Steel
Mechanical properties of 316 l Stainless Steel: 316 l Stainless Steel in the density of 7.98 g/cm3 typical USES for pulp and paper equipment heat exchanger, dyeing equipment, film processing equipment, pipelines, coastal areas with outside the building materials, and advanced the watch chain, use case, etc.Equipment for the production of seawater, chemicals, dyes, papermaking, oxalic acid and fertilizers;Photography, food industry, coastal facilities, ropes, CD rods, bolts, nuts.
Special point: corrosion resistance
External view: good gloss
Summary:
Titanium steel new grades: 022Cr17Ni12Mo2 with Mo(2~3%), excellent corrosion resistance, high temperature resistance, excellent creep resistance.
Feature:
1）The appearance of cold-rolled products is good and beautiful.
2）Due to the addition of Mo, corrosion resistance, especially pitting resistance, is excellent.
3 ) Excellent high temperature strength
4）Excellent work hardenability (weak magnetism after processing)
5）The solution state is non-magnetic;
6）Compared with 304 stainless steel, the price is higher.
Scope of application:
Pipeline, heat exchanger, food industry, chemical industry, clock industry, etc.
Chemical composition %
C≤0.03[2]
Si≤0.75
Mn≤2.00
P≤0.045
S≤0.030
Ni:10.0-14.0
Cr:16.0-18.0
Mo:2.0-3.0
Heat treatment
Melting point: 1375~1450C；
Solid solution treatment：1010~1150C。
Using state
Annealing solution state: NO.1, 2b, N0.4,HL and other surface states.
316L is a kind of stainless steel containing molybdenum. Due to the molybdenum in the steel, the overall performance of the steel is better than 310 and 304 stainless steel. Under high temperature, when the concentration of sulfuric acid is lower than 15% or higher than 85%,
316L stainless steel has a wide range of USES.316L stainless steel also has good resistance to chloride corrosion, so it is commonly used in Marine environments.
The maximum carbon content of 316L stainless steel is 0.03, which can be used in applications that cannot be annealed after welding and need maximum corrosion resistance.
Corrosion resistance:
The corrosion resistance is better than 304 stainless steel, which has good corrosion resistance in pulp and paper production.The 316L stainless steel is also resistant to erosion by the ocean and the corrosive industrial atmosphere.
Heat resistance:
316L stainless steel has good oxidation resistance for intermittent use up to 1600 degrees and continuous use up to 700 degrees.In the range of 800-1575 degrees, it is best not to operate continuously.316L stainless steel, but when used continuously outside the temperature range of 316L stainless steel, the stainless steel has good heat resistance.The 316L stainless steel has a better carbide precipitation resistance than the 316 stainless steel, available in the above temperature range.
Heat treatment:
The solution is annealed at 1010-1150 degrees and then cooled rapidly.316L stainless steel cannot be hardened by overheat treatment.
Welding:
316L stainless steel has good welding performance.All standard welding methods are available for welding.According to the purpose, 316Cb, 316L or 309Cb stainless steel filler rod or electrode can be used for welding.In order to obtain the best corrosion resistance, the welding section of 316 stainless steel needs to be annealed after welding.If 316L stainless steel is used, no post-weld annealing is required.
Mechanical properties of 316L stainless steel:
Tensile strength (Mpa) 485 MIN yield strength (Mpa) 170 MIN elongation rate (%) 30 MIN area reduction (%) 40 MIN 316L stainless steel density 7.93 g/cm3, hardness HRB<90 HV<200 HBS<187
Typical application
Equipment for pulp and paper, heat exchangers, dyeing equipment, film processing equipment, pipes, materials for the exterior of buildings in coastal areas, and the use of chains and cases for high-end watches.Equipment for the production of seawater, chemicals, dyes, papermaking, oxalic acid and fertilizers;Photography, food industry, coastal facilities, ropes, CD rods, bolts, nuts.
Stainless steel knowledge:
Stainless Steel (Stainless Steel) refers to the resistance to weak corrosive medium such as air, steam, water and acid, alkali, salt and other chemical etching medium corrosion of the Steel, also called acid-proof Stainless Steel.In practical application, the steel with weak corrosion resistance is called stainless steel, and the steel with chemical corrosion resistance is called acid resistance steel.Because of the difference in chemical composition, the former is not necessarily resistant to chemical medium corrosion, while the latter is generally non-rust.The corrosion resistance of stainless steel depends on the alloying elements contained in the steel.Density stainless steel SUS316L density of 7.93 g/cm3
Species
Stainless steel is often divided into: martensite steel, ferritic steel, austenitic steel, etc.In addition, can be divided into: chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel.
1、Ferritic stainless steel: 12% ~ 30% chromium.Its corrosion resistance, toughness and weldability improve with the increase of chromium content.Crl7, Cr17Mo2Ti, Cr25, Cr25Mo3Ti, Cr28 and so on fall into this category.Ferritic stainless steel because of high chromium content, corrosion resistance and oxidation resistance are better, but mechanical and technological performance is poor, mostly used for acid resistance structure and oxidation resistance steel.This kind of steel can resist the corrosion of atmosphere, nitric acid and brine solution, and has the characteristics of good oxidation resistance at high temperature, small coefficient of thermal expansion, etc., it is used for nitric acid and food factory equipment, and also can make parts working at high temperature, such as gas turbine parts and so on.
2, austenitic stainless steel: contains chromium more than 18%, also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements.Good comprehensive performance, can withstand a variety of medium corrosion.Common brands of austenitic stainless steel are 1Cr18Ni9, 0Cr19Ni9, etc.WC of 0Cr19Ni9 steel <0.08%, marked as "0" in steel sign.This type of steel contains large amounts of Ni and Cr, which makes the steel austenitic at room temperature.This kind of steel has good plasticity, toughness, weldability and corrosion resistance, good corrosion resistance in oxidizing and reducing medium, used to make acid resistance equipment, such as corrosion resistance container and equipment lining, conveying pipe, nitric acid resistance equipment parts.Austenitic stainless steel is generally treated by solid solution. The steel is heated to 1050 ~ 1150℃ and then cooled by water to obtain single-phase austenitic structure.
3, austenitic - ferrite dual phase stainless steel: both austenitic and ferrite stainless steel advantages, and with superplasticity.Austenitic and ferritic tissues each account for about half of stainless steel.With low C content, Cr content ranged from 18% to 28%, and Ni content ranged from 3% to 10%.Some steels also contain Mo, Cu, Si, Nb, Ti, N and other alloying elements.This kind of steel has the characteristics of both austenitic and ferritic stainless steel. Compared with ferritic stainless steel, it has higher plasticity and toughness, no brittleness at room temperature, significantly improved resistance to intercrystalline corrosion and welding performance. Meanwhile, it also maintains the brittleness of ferritic stainless steel at 475℃ and high thermal conductivity, with the characteristics of superplasticity.Compared with austenitic stainless steel, the strength and resistance to intercrystalline corrosion and chloride stress corrosion are significantly improved.Duplex stainless steel is a kind of nickel - saving stainless steel with excellent corrosion resistance.
4、Martensitic stainless steel: high strength, but poor plasticity and weldability.Martensite stainless steel commonly used grades are 1Cr13, 3Cr13, etc., because of high carbon content, it has higher strength, hardness and wear resistance, but corrosion resistance is slightly poor, used for mechanical performance requirements, corrosion resistance requirements of some general parts, such as spring, turbine blade, hydraulic pressure valve.This kind of steel is used after quenching and tempering.
Stainless steel action
Stainless steel does not cause corrosion, pitting, corrosion or wear.Stainless steel is also one of the strongest materials in building materials.Because stainless steel has good corrosion resistance, it enables structural components to permanently maintain the integrity of the engineering design.Chromium-containing stainless steel also combines mechanical strength and high extensibility, making it easy to process components and meet the needs of architects and structural designers
Typical USES:
Most use requirements are to maintain the building's original appearance for a long time.In determining the type of stainless steel to be selected, the main considerations are the required aesthetic standards, the corrosion of the atmosphere and the cleaning system to be used.However, other applications increasingly seek only structural integrity or impermeability.For example, the roofs and side walls of industrial buildings.In these applications, the owner's cost of construction may be more important than aesthetics, and the surface may not be very clean.304 stainless steel works well in dry indoor environments.However, in rural and urban areas, to maintain their appearance outdoors, they need to be cleaned frequently.In heavily polluted industrial areas and coastal areas, surfaces can be dirty and even corroded.But to get the aesthetic effect in the outdoor environment, we need to use stainless steel containing nickel.Therefore, 304 stainless steel is widely used for curtain walls, side walls, roofs and other architectural purposes, but in the corrosive industrial or Marine atmosphere, the best use of 316 stainless steel.Stainless steel sliding door now, people had realized the superiority that USES stainless steel in structural application adequately.Several design criteria include 304 and 316 stainless steels.This type of steel is also included in the European code because it combines good atmospheric corrosion resistance with high tensile and elastic strength.In fact, stainless steel is manufactured in full standard metal shapes and sizes and has many special shapes.The most commonly used products are made from sheet and strip steel, and special products are also made from medium and thick plates, for example, hot rolled structural steel and extruded structural steel.There are also round, oval, square, rectangular and hexagonal welded or seamless tubes and other forms of products, including profiles, bars, wires and castings.
Surface state
As will be discussed later, various commercial surface finishes have been developed to meet the aesthetic requirements of architects.For example, surfaces can be highly reflective or dull;Can be smooth, polished, or embossed;It can be colored, colored, electroplated or etched on the surface of stainless steel with patterns, also can be brushed to meet the designer's various requirements for the appearance.It is easy to maintain the surface state.An occasional rinse will remove the dust.Due to its good corrosion resistance, it is also easy to remove paint stains or similar other surface contaminants.
Vision of the future
Since stainless steel already has many of the desired properties required for building materials, it is arguably unique among metals and its development continues.Existing types have been improved to make stainless steel perform better in traditional applications, and new stainless steels are being developed to meet the stringent requirements of advanced architectural applications.Stainless steel has become one of the most cost-effective materials of choice for architects due to the continuous improvement in productivity and quality.Stainless steel will remain one of the best building materials in the world because of its performance, appearance and use.
Storage conditions:
Pay attention to moisture, dust, oil, lubricating oil, as well as surface rust, or poor welding corrosion resistance.When water is immersed between the film and the steel substrate, the corrosion rate is faster than that without the film.Shall be kept in the warehouse
Put in clean, dry and easy to pass the wind place, keep the original packaging state, the stainless steel film should avoid direct light, the film should be periodic inspection, if the film deterioration (film life of 6 months) should be replaced immediately, if the packing material when pad paper soaked, in order to prevent surface corrosion should be immediately removed pad paper.
