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[China]
Address: Guangyi Road, Wuxi, Jiangsu Province，China.
Contact name:Christina
Wuhan Longgang Pressure Pipeline Co., Ltd. |
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904L stainless steel pipe description
904L stainless steel pipe 904L stainless steel seamless pipe 904L stainless steel welded pipe 316L stainless steel pipe
Super austenitic stainless steel 904L (00Cr20Ni25Mo4.5Cu; UNS:
N08904; EN: 1.4539) is a high alloy austenitic stainless steel with
low carbon content. It has good corrosion resistance in dilute
sulfuric acid and is specially designed for environments with
severe corrosion conditions. It has high chromium content and
sufficient nickel content. The addition of copper makes it have
strong acid resistance, especially high resistance to chloride
interstitial corrosion and stress corrosion cracking. It is not
easy to appear corrosion spots and cracks. Its resistance to
pitting corrosion is slightly better than that of other steels. It
has good processability and weldability, and can be used for
pressure vessels.
Brand and standard:
UNS N08904 (a standard jointly designed by the Society of
Automotive Engineers and the American Society for Testing and
Materials in 1967), DIN1.4539 (a German standard), ASTM A240 (an
American Society for Testing and Materials standard; the new
standard classifies it as a stainless steel series, and the
original standard ASME SB-625 classifies it as a nickel base alloy
series), SUS890L.
ASTM 904l stainless steel tube -1
316L hollow stainless steel tube -2
Metallographic structure of 904L stainless steel:
904L is a completely austenitic structure. Compared with ordinary
austenitic stainless steel with high molybdenum content, 904L has a
significant effect on ferrite and α The precipitation of phase is
not sensitive.
Physical and mechanical properties:
Density: 8.0g/cm3. Tensile strength: σ b≥520Mpa. Elongation: δ
≥35%. Corrosion resistance of 904L stainless steel:
Because the carbon content of 904L is very low (maximum 0.020%),
there will be no carbide precipitation under general heat treatment
and welding conditions. This eliminates the risk of intergranular
corrosion after general heat treatment and welding. Because of the
high content of chromium, nickel and molybdenum and the addition of
copper, the 904L can be passivated even in reducing environments,
such as sulfuric acid and formic acid. The high nickel content
makes it have a low corrosion rate in the active state. In the
concentration range of 0~98% of pure sulfuric acid, the use
temperature of 904L can be as high as 40 ℃. The corrosion
resistance of pure phosphoric acid in the concentration range of
0~85% is very good. In the industrial phosphoric acid produced by
wet process, impurities have a strong impact on the corrosion
resistance. Among all kinds of phosphoric acid, 904L has better
corrosion resistance than ordinary stainless steel. In strong
oxidizing nitric acid, the corrosion resistance of 904L is lower
than that of high alloyed steel without molybdenum. In hydrochloric
acid, the use of 904L is limited to 1-2% of the lower
concentration. In this concentration range. The corrosion
resistance of 904L is better than that of conventional stainless
steel. 904L steel has high resistance to spot corrosion. In
chloride solution, its crevice corrosion resistance is also very
good. The high nickel content of 904L reduces the corrosion rate in
pits and crevices. When the temperature of ordinary austenitic
stainless steel is higher than 60 ℃, it may be sensitive to stress
corrosion in a chloride rich environment. This sensitivity can be
reduced by increasing the nickel content of stainless steel. Due to
the high nickel content, 904L has high resistance to stress
corrosion cracking in chloride solution, concentrated hydroxide
solution and hydrogen sulfide rich environment.
The 904L is used in the following fields:
*Petroleum and petrochemical equipment, such as reactors in
petrochemical equipment.
*Storage and transportation equipment of sulfuric acid, such as
heat exchanger.
*The flue gas desulfurization device of the power plant is mainly
used in the absorber body, flue, shutter, internals, spraying
system, etc.
*Scrubber and fan in organic acid treatment system.
*Sea water treatment plant, sea water heat exchanger, paper
industry equipment, sulfuric acid and nitric acid equipment, acid
making, pharmaceutical industry and other chemical equipment,
pressure vessels, food equipment.
*Pharmaceutical factory: centrifuge, reactor, etc.
*Vegetable food: soy sauce pot, cooking wine, salt pot, equipment
and dressings.
*904L is a matching steel for dilute sulfuric acid strong corrosive
medium.
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| Specification table of seamless steel pipe | |||||
| Type | Specification | Specification | Specification | Specification | Remark |
| Specification of seamless steel pipe | 20*2-5 | 114*4-22 | 377*6-110 | 1110*10-80 | Seamless steel pipe can accept non-standard customization |
| 25*2-6 | 133*4-22 | 426*8-140 | 1120*12-60 | ||
| 30*3-6 | 140*4-45 | 457*8-140 | 2000*10-50 | ||
| 38*2-6 | 159*4-45 | 480*8-150 | 6*0.5-5 | ||
| 42*3-8 | 168*4-45 | 530*8-150 | 8*0.5-5 | ||
| 45*3-8 | 180*4-48 | 580*8-150 | 10*0.5-5 | ||
| 51*3-8 | 194*6-48 | 630*8-150 | 12*0.5-5 | ||
| 57*3-16 | 203*6-70 | 720*8-150 | 14*0.5-5 | ||
| 60*3-18 | 219*6-70 | 820*8-150 | 15*0.5-5 | ||
| 76*3-18 | 273*6-70 | 920*8-100 | 16*0.5-5 | ||
| 89*3-18 | 299*6-80 | 1020*8-110 | 18*0.5-5 | ||
| 95*6-22 | 325*6-100 | 1040*8-110 | |||
| 108*4-22 | 351*6-110 | 1060*8-110 | |||
Common problem
1. Are you a manufacturing company or a trading company?
We are manufacturing, we have 20 years of experience in domestic
supply of metal materials and products.
2. What services can you provide?
We can provide various metal materials and products, as well as
other process services.
3. Can you provide free samples?
We can provide free samples, but the express freight of samples
should be provided by you.
4. If we place an order, how fast will your delivery time be?
7-10 days after receiving your deposit is normal.
5. What payment terms can you accept?
We can now accept TT, Western Union remittance or negotiation.
