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Current Position:Home > Company news > 904L SEAMLESS P

904L SEAMLESS PIPES/TUBES SUPPLIER/MANUFACTURER SHOULD KNOWS

Release Date:2017-04-11

We have a lot of ready stcok UNS N08904/904L  1''-12'' SCH10,40,80, so,you want best UNS N08904/904L seamless pipe supplier/manufacturer,just choose us!


 



UNS N08904/DIN1.4539/904L SEAMLESS PIPES/TUBES SUPPLIER&MANUFACTURER

904L seamless stainless steel pipes/tubes editor

904L stainless steel seamless pipes/tubes<904lseamlesspipetubesupplier> (00 cr20ni25mo4. 5 cu/UNS N08904/904L/DIN1.4539) has better corrosion resistance of austenitic stainless steel, because of adding 1.5% copper, for reducing acid, such as sulfuric acid and phosphoric acid also has very good corrosion resistance, in addition, has the characteristics of low carbon in welding purposes.

Chinese name of 904 l seamless pipe supplier/manufacturer/tube foreign names Super austenitic stainless steel pipe seamless pipe diameter 6-720 - mm wall thickness 0.4 welded pipe diameter 12-14 mm - 1820 mm

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Product introduction 

Corrosion resistance of 904L stainless steel tube  904L SEAMLESS PIPE SUPPLIER/manufacturer

Stainless steel seamless tube, welded pipe (decoration), square tube. Its specifications: 3-577 - mm seamless tube diameter, wall thickness 0.4-14 mm; 6-219 - MM welded pipe diameter, wall thickness 0.3 4.0 MM.


FEATURES 

Since the 904 l carbon content is very low (0.020%), so in the case of the general heat treatment and welding, there would be no carbide precipitation. This eliminates the general heat treatment after welding and appear in the danger of intergranular corrosion. Because of the high nickel chrome molybdenum content, and add the copper, so the 904L stainless steel tube

Even in a reducing environment, such as sulfuric acid and formic acid can also be in the passivation. High nickel content in the active state has low corrosion rate. In the concentration range of 0 ~ 98% pure sulfuric acid, the use of 904 l temperature can be as high as 40 ℃. In 0 ~ 85% pure phosphoric acid concentration range, its corrosion resistance is very good. In wet process of industrial phosphoric acid, impurity against corrosion has a strong influence. In all the various kinds of phosphate, 904L stainless steel tube (904LSEAMLESSPIPESUPPLIER/manufacturer) corrosion resistance is superior to the ordinary stainless steel pipe. In strong oxidizing nitrate, compared with the high alloying steel does not contain molybdenum, low corrosion resistance. In hydrochloric acid, the use of 904 l stainless steel tube is limited to a lower concentration of 1-2%. In this concentration range. Good corrosion resistance of 904L stainless steel tube(904L seamless pipe supplier/manufacturer) to the conventional stainless steel. 904 l stainless steel tube of high corrosion resistance. The crevice corrosion resistance in chloride solution is also very good. 904 l stainless steel pipe, high nickel content reduced in pit and the corrosion rate of gaps. Ordinary austenitic stainless steel in the temperature above 60 ℃, in a rich chloride environment sensitive to stress corrosion may be, by improving the nickel content of stainless steel, can reduce the sensitization. Because of the high content of nickel, 904L stainless steel tube in chloride solution, concentration of hydroxide solution and rich hydrogen sulfide environment, has the very high resistance to stress corrosion cracking ability.

    904L is designed for harsh environment corrosion condition of a low carbon content, high alloying austenitic stainless steel, 316 l and 317 l has better corrosion resistance, both price and performance, cost-effective high. By adding 1.5% copper, for reducing acid, such as sulfuric acid and phosphoric acid, has the very good corrosion resistance.(904LSEAMLESSPIPESUPPLIER/manufacturer)


 UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes  Weight 

Weight (kg) (m) (m) = length * width * thickness (mm) * density value

Stainless steel: the proportion of low chromium stainless steel from 7.75 t/M3 low chromium nickel stainless steel take 7.93 t/M3 low iron take 7.87 t/M3

Stainless steel plate theory weight calculation formula

Theory of steel weight length (mm) x width (mm) (mm) x x thickness density value = weight (kg)

Chemical composition of editing


UNS N08904/DIN1.4539/904L stainless steel chemical composition:


standard

C

Si

Mn

P

S

Cr

Ni

Mo

Cu

ASTM

≤0.02

≤1.00

≤2.00

≤0.045

≤0.035

19.00~23.00

23.00~28.00

4.0~5.0

1.00~2.00




UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes manufacture process


UNS N08904/DIN1.4539/904L super austenitic stainless steel pipe research and development 

904L high corrosion resistant super molybdenum austenitic stainless steel, equivalent to the N08904 in the American standard ASTM. It is in the original stainless steel containing 20%, nickel chromium content of 25%, on the basis of molybdenum content to 4% ~ 5%, and joined the copper element, to further improve its pitting corrosion resistance and corrosion resistance, is often used in corrosive environment, is the conventional stainless steel(904l seamless pipe tubesupplier/manufacturer) life many times. The steel grade, though the use of an outstanding performance, compared with the conventional 18 8 stainless steel, thermoplastic is poor. In our country, most of the production of seamless steel tube with two rollers skew rolling perforation technology, with 904L stainless steel seamless steel tube production its difficulty is bigger, often in perforated pipe cracking is serious. In foreign countries, this kind of steel is mostly adopted hot extrusion process, but considering the hot extrusion machine under the condition of less, improve steel thermoplastic become the urgent requirement of our customers.

According to the actual situation of the company, (904L seamless pipe tube supplier/manufacturer)the design of 904 l high corrosion resistant super molybdenum austenitic stainless steel smelting production process is as follows: at the beginning of ingredients - electric furnace smelting to AOD refining to die casting, grinding, heating to rolling (forging) to finishing, inspection, packaging to storage, shipment.

Optimize the chemical composition design, to improve its pitting corrosion resistance and corrosion resistance. First, strictly control the C content is below 0.018%, to improve its corrosion resistance; (904l seamless pipe tube supplier/manufacturer)Second, strict control of N content is below 0.06%, avoid its cold and hot working performance of steel and adverse effects caused by cold forming. At the same time raise the austenite formation elements Ni content, expand the gamma phase region, improve the thermodynamic stability, corrosion resistance, significantly improve the plasticity and toughness, improve the cold forming performance, reduce the tendency to cold working. Internal control components are shown in table 1.

                                  

Table 1 904L high molybdenum austenitic stainless steel (904L SEAMLESS PIPE SUPPLIER/manufacturer)corrosion resistant super standard composition and internal control components (mass fraction, %) 

CHEMICAL

C

Si

Mn

P

S

Cr

Ni

Mo

Cu

N

STANDARD

≤0.020

≤0.70

≤2.0

≤0.030

≤0.008

19.021.0

24.026.0

4.05.0

1.22.0

-

MANUFACTURE

≤0.018

0.300.60

1.01.5

≤0.028

≤0.005

19.520.0

24.224.5

4.14.3

1.31.6


≤0.06



AOD furnace adopt unique four yuan refining slag system, improve the purity of molten steel,(904l seamless pipe tube supplier) and slag using single control method to guarantee the C content of ultra-low carbon steel. Casting cleaning work, using mullite refractory brick, reduce foreign inclusions from molten steel scouring (; Calm time should not less than 8 min, let package inclusion floating fully; Ladle nozzle and pouring brick used between the combustion type shield funnel, using its consume oxygen around the combustion process, to prevent secondary oxidation of liquid steel.

Rolling process using: 350 mm steel ingot to grinding, heating temperature control to breakdown, three roller grinding to temperature control of heating, the roughing - rolling - collection. Rolling technology requirements: <904l seamless pipe tube supplier/MANUFACTURER>as the steel grade spread from 304 steel grade is small, nearly 316 kinds of, in the process of rolling, pay special attention to black, it is forbidden to billet head pour water; Slow rhythm of rolling, forbidden billet cooling roller table in front of the machine; Pay close attention to the rolling temperature of not less than 1080 ℃.(904L seamless pipe tube supplier/MANUFACTURER) 


UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes APPLICATIONS


UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Ship Builders, 

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Automotive Industry, 

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Power Generation, 

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Food Industry, 

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Paper Industry, 

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Pharmaceutical Industry,

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Chemical Industry, 

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Oil and Gas Industry, 

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Heat Exchanger

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Chemical process vessels,

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In piping and heat exchangers

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Pulp mill digesters,

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In bleach washers,

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In chip pre-steaming vessels

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Food processing equipment

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Oil field piping and heat exchangers

UNS N08904/1.4539/ASTM B677 904L Seamless Pipes/Tubes Use In Flue gas desulfurization equipment