N08904 / 904L stainless steel pipe super austenitic
What material is UNS N08904 AISI 904L ， factory in china.
UNS N08904 / AISI 904L / EN 1.4539 material related products:
904L stainless steel welded pipe, N08904 seamless pipe, N08904 steel plate, N08904 round steel, N08904 forging, N08904 flange, N08904 ring, N08904 welded pipe, N08904 steel strip, N08904 straight rod, UNS N08904 stainless steel pipe, N08904 round cake, 904L N08904 square pipe, 904L stainless steel pipe, N08904 904L concentric reducer, N08904 904L elbow, 90 ° long radius, N08904 equal diameter tee and N08904 machined parts, 904L seamless stainless steel pipe 。 please check www.worldsteelasia.com
904L super austenitic stainless steel is a low carbon, high nickel, molybdenum austenitic stainless and acid resistant steel. It has good activation passivation transformation ability, excellent corrosion resistance, good corrosion resistance in non oxidizing acids such as sulfuric acid, acetic acid, formic acid and phosphoric acid, good pitting corrosion resistance in neutral chloride ion containing medium, and good crack corrosion resistance and stress corrosion resistance. It is suitable for various concentrations of sulfuric acid below 70 ℃. It is also resistant to acetic acid of any concentration and temperature under normal pressure and the mixed acid of formic acid and acetic acid. Super austenitic stainless steel 904L is a high alloy austenitic stainless steel with low carbon content. It has good corrosion resistance in dilute sulfuric acid. It is designed for harsh corrosion conditions. It has high chromium content and sufficient nickel content. The addition of copper makes it have strong acid resistance, especially highly resistant to chloride interstitial corrosion and stress corrosion cracking, less prone to corrosion spots and cracks, slightly better anti pitting ability than other steel grades, and good machinability and weldability
N08904 / 904L super stainless steel grade and standard:
00Cr20Ni25Mo4. 5Cu ( Chinese standard ), UNS N08904 ( standard jointly designed by American Society of automotive engineers and American Society for testing and materials in 1967), DIN 1.4539 (German standard), EN 1.4539 , sus890l , F904l, NAS 255
Executive Standards: ASTM A240 / ASME SA-240 (American Society for testing and materials standard; the new standard classifies it as stainless steel series and the original standard ASME SB-625 classifies it as nickel base alloy series), ASTM a276 , ASTM A182 / ASME SA-182 , ASTM A312 / ASMEs A312 , ASTM B625 / ASME B625、ASTM B673 / ASME B673
N08904 / 904L chemical composition
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| CHONGQING WORLD STEEL CO.,LTD 904 & 904L ( UNS N08904 ) Chemical Requirements | |||||||||||
| Grade | UNS Desig- nationA | Composition, %B | |||||||||
| Carbon | Manga- nese | Phos- phorus | Sulfur | Silicon | Chrom- ium | Nickel | Molyb- denum | Nitro- genC | Copper | ||
| 904L | N08904 | 0.020 | 2.00 | 0.040 | 0.030 | 1.00 | 19.0 – 23.0 | 23.0 – 28.0 | 4.0 – 5.0 | 0.10 | 1.00 – 2.00 |
| 904L Minimum mechanical properties at room temperature: | |||
| Grade | Tensile Strength | Yield Strength | Elongation |
| Rm N/mm2 | RP0.2N/mm2 | % | |
| UNS N08904 / 904L | 490 | 216 | 35 |
Corrosion resistance and main application environment of 904L stainless steel
904L stainless steel is a kind of austenitic stainless steel with low carbon content and high alloying designed for harsh corrosion conditions. It has better corrosion resistance than 316L and 317L. At the same time, it takes into account the price and performance, and has high cost performance. Due to the addition of 1.5% copper, it has excellent corrosion resistance for reducing acids such as sulfuric acid and phosphoric acid. It also has excellent corrosion resistance and intergranular corrosion resistance to stress corrosion, pitting corrosion and crevice corrosion caused by chloride ions. In the concentration range of 0-98%, the use temperature of 904L in pure sulfuric acid 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 influence on the corrosion resistance. Among all kinds of phosphoric acid, 904L has better corrosion resistance than ordinary stainless steel. In strong oxidizing nitric acid, 904L has lower corrosion resistance than high alloying steel without molybdenum. In hydrochloric acid, the use of 904L is limited to a lower concentration of 1-2%. In this concentration range. The corrosion resistance of 904L is better than that of conventional stainless steel. 904L steel has high pitting corrosion resistance. It can resist crevice corrosion in chloride solution. The force is also very good. The high nickel content of 904L reduces the corrosion rate in pits and cracks. 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.
N08904 / 904L stainless steel applications
Petroleum and petrochemical equipment, such as reactors in petrochemical equipment, storage and transportation equipment of sulfuric acid, such as heat exchangers, flue gas desulfurization devices in power plants, mainly used in: tower body, flue, gate plate, internals, spray system, etc. of absorption tower, scrubber and fan in organic acid treatment system, seawater treatment device, seawater heat exchanger, paper industry equipment, sulfuric acid and nitric acid equipment, acid making Pharmaceutical industry and other chemical equipment, pressure vessels, food equipment, pharmaceutical factories: centrifuges, reactors, etc., plant food: soy sauce tanks, cooking wine, salt tanks, equipment and dressings. 904L is a matching steel for dilute sulfuric acid and strong corrosive medium.
from www.worldsteelasia.com
