304L stainless steel plate has much less carbon than 304.
ingredient
304 stainless steel grade :0Cr18Ni9(0Cr19Ni9) 06Cr19Ni9 S30408
Chemical composition :C:≤0.08, Si :≤1.0 Mn :≤2.0, Cr :18.0~20.0, Ni :8.0~10.5, S :≤0.03, P :≤0.035 N≤0.1.
With 304L
304L is more resistant to corrosion, and 304L contains less carbon.
304 is widely used, with good corrosion resistance, heat resistance, low temperature strength and mechanical characteristics; Stamping bending and other hot processing good, no heat treatment hardening phenomenon (non-magnetic, use temperature -196°C~800°C).
304L has excellent resistance to grain boundary corrosion after welding or stress relief; In the absence of heat treatment, it can also maintain good corrosion resistance, and the service temperature is -196°C-800°C.
Folding basics
There are two kinds of hot rolling and cold rolling according to the preparation method, and they are divided into 5 categories according to the structure characteristics of steel: austenitic type, austenite-ferritic type, ferritic type, martensitic type and precipitation-hardening type. Requirements can withstand oxalic acid, sulfuric acid-ferric sulfate, nitric acid, nitric acid-hydrofluoric acid, sulfuric acid-copper sulfate, phosphoric acid, formic acid, acetic acid and other acids corrosion, widely used in chemical, food, medicine, paper making, petroleum, atomic energy and other industries, as well as construction, kitchen utensils, tableware, vehicles, household appliances and various parts.
The surface of the stainless steel plate is smooth, has high plasticity, toughness and mechanical strength, and is resistant to acid, alkaline gas, solution and other media corrosion. It is an alloy steel that is not easy to rust, but it is not absolutely rust free.
The stainless steel plate is divided into two kinds of hot rolled and cold rolled according to the manufacturing method, including a thin cold plate with a thickness of 0.02-4 mm and a medium and thick plate with a thickness of 4.5-100 mm.
In order to ensure that the mechanical properties of all kinds of stainless steel plates such as yield strength, tensile strength, elongation and hardness meet the requirements, the steel plate must be annealing, solution treatment, aging treatment and other heat treatment before delivery
The corrosion resistance of stainless steel mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, etc.) and the internal organizational structure, which plays the main role of chromium. Chromium has high chemical stability, can form a passivation film on the surface of the steel, isolate the metal from the outside world, protect the steel plate from oxidation, and increase the corrosion resistance of the steel plate. After the passivation film is destroyed, the corrosion resistance decreases.
Folding national standard nature
Tensile strength (Mpa) 520
Yield strength (Mpa) 205-210
Elongation (%) 40%
Hardness HB187 HRB90 HV200
The density of 304 stainless steel 7.93g /cm3 austenitic stainless steel is generally used this value 304 chromium content (%) 17.00-19.00, nickel content (%)8.00-10.00, 304 is equivalent to China's 0Cr19Ni9 (0Cr18Ni9) stainless steel
304 stainless steel is a kind of universal stainless steel material, rust resistance than 200 series of stainless steel material is stronger. High temperature resistance is also better.
304 stainless steel has excellent corrosion resistance and good resistance to intergranular corrosion.
For oxidizing acid, it is concluded in the experiment that 304 stainless steel has strong corrosion resistance in nitric acid below the boiling temperature of ≤65%. It also has good corrosion resistance to alkaline solutions and most organic and inorganic acids.
Folding general property
304 stainless steel plate has beautiful surface and diverse use possibilities
Good corrosion resistance, durable corrosion resistance than ordinary steel
The strength is high, so the possibility of using thin plates is large
High temperature oxidation resistance and high strength, so it can resist fire
Normal temperature processing, that is, easy plastic processing
Because it does not need surface treatment, it is simple and easy to maintain
Clean, high finish
Good weldability
Folding and drawing properties
Dry grinding and drawing
The most common filament and short wire on the market, 304 stainless steel plate after processing such surfaces, shows a good decorative effect, can meet the requirements of general decorative materials. In general, 304 series stainless steel can form a good effect after a scrub. Due to the low cost, simple operation, low processing cost and wide application range of this kind of processing equipment, it has become a necessary equipment for processing centers. Therefore, most machining centers can provide long and short wire frosted boards, of which 304 steel accounts for more than 80%.
Two, oil grinding wire drawing
304 series stainless steel after oil grinding reflects the perfect decorative effect, widely used in elevators, home appliances and other decorative panels. Cold-rolled 304 series stainless steel can generally achieve good results after a scrub pass, and there are some processing centers on the market that can provide oil-based scrub processing of hot-rolled stainless steel, and its effect is comparable to that of cold-rolled oil grinding. Oil-based drawing is also divided into filament and short filament. Elevator decoration generally uses filament, and all kinds of small household appliances, kitchenware and other two kinds of patterns have a choice.
Difference with 316
The two most commonly used stainless steel 304,316 (or corresponding to the German/European standard 1.4308,1.4408), 316 and 304 in the chemical composition of the main difference is that 316 contains Mo, and it is generally recognized that 316 corrosion resistance is better than 304 in high temperature environment more corrosion resistance. Therefore, in a high temperature environment, engineers generally choose parts of 316 material. But the so-called thing is not absolute, in the concentrated sulfuric acid environment, then high temperature do not use 316! Or this is gonna be a big deal. Mechanical people have learned thread, remember in order to prevent thread bite at high temperatures, need to apply a black solid lubricant: molybdenum disulfide (MoS2), from which it draws 2 conclusions is not :[1]Mo is indeed a high-temperature material (know what crucible gold melts with? Molybdenum crucible!) . [2] Molybdenum readily reacts with high sulfur ions to form sulfide. So no stainless steel is super resistant to corrosion. In the end, stainless steel is a piece of impurities (but these impurities can be more corrosion resistant than steel ^^) more steel, steel can react with other substances.
National brand number
Old brand standard :GB/T4237-1992 0Cr18Ni9
New brand standard :GB24511-2009 06Cr19Ni10
Stainless steel US label number
Standard: ASTM A240/A240M 304
The American Iron and Steel Institute uses three digits to label various standard grades of malleable stainless steel. Among them :① Austenitic stainless steel with 200 and 300 series of digital marks.
② Ferrite and martensitic stainless steel are represented by 400 series numbers. For example, some of the more common austenitic stainless steels are labeled 201, 304, 316, and 310.
③ Ferritic stainless steel is marked with 430 and 446, martensitic stainless steel is marked with 410, 420 and 440C, biphase (austenite-ferrite).
Stainless steel precipitation-hardened stainless steel and high alloys with an iron content of less than 50% are usually named using patent names or trademarks.
Standard classification and grading
4-1 Classification :① National standard GB ② Industry standard YB ③ Local standard ④ Enterprise standard Q/CB
4-2 Classification :① product standard ② packaging standard ③ Method standard ④ basic standard
4-3 Standard level (three levels):Y level: international advanced level I level: international general level H level: domestic advanced level
4-4 National standard GB1220-84 stainless rod (I level) GB4241-84 stainless welding disk (H level) GB4356-84 stainless welding disk (I level) GB1270-80 stainless pipe (I level) GB12771-91 stainless welded pipe (Y level) GB3280-84 Stainless cold plate (Class I) GB4237-84 Stainless hot plate (Class I) GB4239-91 Stainless cold belt (Class I)
Theoretical weight
Weight(kg)=Thickness(mm)*Width(m)*Length(m)*Density(g/cm3)
Weight (kg)= Thickness (mm)* Width (m)* Length (m)* density value
