Introduction
AISI 904L stainless steel coil is a high-alloy, superaustenitic stainless steel renowned for its exceptional resistance to corrosion in various demanding environments. This low-carbon steel belongs to the UNS N08904 designation and offers superior performance compared to standard austenitic stainless steels due to its unique composition.
Composition
AISI 904L boasts a potent combination of chromium, nickel, molybdenum, and copper:
Chromium (19-23%): Provides the foundation for excellent corrosion resistance.
Nickel (23-26%): Further enhances corrosion resistance and formability.
Molybdenum (4-5%): Significantly improves resistance to specific acids, particularly sulfuric acid.
Copper (1-2%): Offers additional resistance to a wider range of corrosive media.
Low Carbon (Less than 0.03%): Minimizes the risk of chromium carbide precipitation during welding, which can negatively impact corrosion resistance.
Characteristics
Exceptional Corrosion Resistance: The key strength of 904L is its unparalleled resistance to a vast array of corrosive environments. It excels in sulfuric acid solutions (even dilute concentrations at elevated temperatures), phosphoric acid, and chloride-containing media. This makes it ideal for applications where standard stainless steels fall short.
Good Weldability: Due to its low carbon content, AISI 904L offers good weldability with minimal risk of weld decay. However, proper welding procedures are crucial to maintain optimal corrosion resistance in the welded zone.
Formability: AISI 904L exhibits good formability, allowing for shaping into desired configurations during fabrication.
Strength and Hardness: While not the primary focus, AISI 904L possesses moderate strength and hardness compared to other austenitic stainless steels. These properties can be further enhanced through cold working.
Uses
Due to its exceptional corrosion resistance, AISI 904L stainless steel coil finds application in various demanding environments, including:
Chemical Processing Equipment: Components handling sulfuric acid, phosphoric acid, and chloride solutions can significantly benefit from the superior corrosion resistance of 904L.
Offshore Oil and Gas Exploration: Pipelines, valves, and other equipment exposed to seawater and harsh environments utilize 904L due to its durability.
Pulp and Paper Industry: Process equipment handling bleach and other corrosive chemicals can be constructed from AISI 904L to ensure longevity.
Food Processing Equipment: Certain components requiring high corrosion resistance and good cleanability, like heat exchangers, can be made from 904L.
Architectural Applications: Exterior architectural elements in highly polluted or coastal environments can benefit from the corrosion resistance of 904L, especially for structures requiring a long lifespan.
Additional Points
AISI 904L adheres to various standard specifications, such as ASTM A240/ASME SA240. ensuring consistent material properties.
Like most austenitic stainless steels, 904L is not magnetic.
Due to the higher alloy content, 904L is typically more expensive than standard austenitic steels.
Stainless Steel Description
| Stainless Steel Coil/Sheet/Plate Information | |||||||||
| Technique | Surface Finish | Grade Series | Thickness(mm) | Width(mm) | |||||
| Main Dimension | |||||||||
| 20-850 | 1000 | 1219 | 1240 | 1250 | 1500 | ||||
| Hot Rolled | No.1 / 2E | 201/304/316L | 2.2-12.0 | √ | √ | √ | √ |
|
√ |
| Cold Rolled | 2B | 201/304/316L | 0.25-3.0 | √ | √ | √ | √ | √ | √ |
| 410S/430 | 410S/430 | 0.25-3.0 | √ | √ | √ |
|
√ | ||
| No.4 /Hairline Mirror / Linen SB |
201/304/316L/ | 0.22-3.0 | √ | √ | √ | √ | √ | √ | |
| 410S/430 | 410S/430 | 0.25-3.0 | √ | √ | √ | √ | √ | ||
| BA | 201/304 | 0.2--1.8 | √ | √ | √ | √ | √ | √ | |
| 410S/430 | 410S/430 | 0.25-3.0 | √ | √ | √ |
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2BA | 304/410S/430 | 0.25-2.0 | √ | √ | √ | √ |
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| If you need, we can customize the size according to your requirements | |||||||||
Chemical Properties of Frequently-used
| UNS | ASTM | EN | JIS | C% | Mn% | P% | S% | Si% | Cr% | Ni% | Mo% |
| S20100 | 201 | 1.4372 | SUS201 | ≤0.15 | 5.5-7.5 | ≤0.06 | ≤0.03 | ≤1.00 | 16.0-18.0 | 3.5-5.5 | - |
| S20200 | 202 | 1.4373 | SUS202 | ≤0.15 | 7.5-10.0 | ≤0.06 | ≤0.03 | ≤1.00 | 17.0-19.0 | 4.0-6.0 | - |
| S30100 | 301 | 1.4319 | SUS301 | ≤0.15 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 16.0-18.0 | 6.0-8.0 | - |
| S30400 | 304 | 1.4301 | SUS304 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤0.75 | 18.0-20.0 | 8.0-10.5 | - |
| S30403 | 304L | 1.4306 | SUS304L | ≤0.03 | ≤2.00 | ≤0.045 | ≤0.03 | ≤0.75 | 18.0-20.0 | 8.0-12.0 | - |
| S30908 | 309S | 1.4833 | SUS309S | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤0.75 | 22.0-24.0 | 12.0-15.0 | - |
| S31008 | 310S | 1.4845 | SUS310S | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.50 | 24.0-26.0 | 19.0-22.0 | - |
| S31600 | 316 | 1.4401 | SUS316 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤0.75 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
| S31603 | 316L | 1.4404 | SUS316L | ≤0.03 | ≤2.00 | ≤0.045 | ≤0.03 | ≤0.75 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
| S31703 | 317L | 1.4438 | SUS317L | ≤0.03 | ≤2.00 | ≤0.045 | ≤0.03 | ≤0.75 | 18.0-20.0 | 11.0-15.0 | 3.0-4.0 |
| S32100 | 321 | 1.4541 | SUS321 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤0.75 | 17.0-19.0 | 9.0-12.0 | - |
| S34700 | 347 | 1.455 | SUS347 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤0.75 | 17.0-19.0 | 9.0-13.0 | - |
| S40500 | 405 | 1.4002 | SUS405 | ≤0.08 | ≤1.00 | ≤0.04 | ≤0.03 | ≤1.00 | 11.5-14.5 | ≤0.60 | - |
| S40900 | 409 | 1.4512 | SUS409 | ≤0.08 | ≤1.00 | ≤0.045 | ≤0.03 | ≤1.00 | 10.5-11.75 | ≤0.50 | - |
| S43000 | 430 | 1.4016 | SUS430 | ≤0.12 | ≤1.00 | ≤0.040 | ≤0.03 | ≤0.75 | 16.0-18.0 | ≤0.60 | - |
| S43400 | 434 | 1.4113 | SUS434 | ≤0.12 | ≤1.00 | ≤0.040 | ≤0.03 | ≤1.00 | 16.0-18.0 | - | - |
| S44400 | 444 | 1.4521 | SUS444L | ≤0.025 | ≤1.00 | ≤0.045 | ≤0.03 | ≤1.00 | 17.5-19.5 | ≤1.00 | - |
| S40300 | 403 | - | SUS403 | ≤0.15 | 5.5-7.5 | ≤0.04 | ≤0.03 | ≤0.50 | 11.5-13.0 | ≤0.60 | - |
| S410000 | 410 | 1.40006 | SUS410 | ≤0.15 | ≤1.00 | ≤0.035 | ≤0.03 | ≤1.00 | 11.5-13.5 | ≤0.60 | ≤1.00 |
| S42000 | 420 | 1.4021 | SUS420J1 | 0.16~0.25 | ≤1.00 | ≤0.04 | ≤0.03 | ≤1.00 | 12.0-14.0 | ≤0.75 | ≤1.00 |
| S440A | 440A | 1.4028 | SUS440A | 0.60~0.75 | ≤1.00 | ≤0.04 | ≤0.03 | ≤1.00 | 16.0-18.0 | - | ≤0.75 |
| S32750 | SAD2507 | 1.441 | ≤0.03 | ≤1.2 | ≤0.035 | ≤0.02 | ≤0.80 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | |
| S31803 | SAF2205 | 1.4462 | ≤0.03 | ≤2.0 | ≤0.03 | ≤0.02 | ≤1.00 | 21.0-23.0 | 4.0-6.5 | 2.5-3.5 | |
| N08904 | 904L | 1.4539 | ≤0.0.3 | ≤2.0 | ≤0.035 | ≤0.03 | ≤1.00 | 18.0-20.0 | 23.0-25.0 | 3.0-4.0 |
Stainless Steel Material Properties
| Surface Finished | Characteristics | Characteristics |
| NO.1 | Finished by hot-rolling, smoother and pickling, characterized by white pickled surface. | Chemical industry equipment, Industrial tanks. |
| 2B | Finished by anneal treatment, pickling after cold rolling, followed by skin pass line to more brighter and smoother surface. | General application medical instruments, Tableware. |
| BA | Bright anneal treatment after cold rolling. | Kichen utenstil, Kitchen ware,Architectural purpose. |
| NO.4(Satin) | Finished by incontinuous linear brushing | Architecture,industries,Escalators, Kitchen ware, Vehicles. |
| Hairline | Finished by continuous linear brushing | |
| 8K(mirror) | A mirror-like reflective surface by polishing with finer abrasives over 800 mesh. | Refletor, Mirror, Interior- Exterior decoration for building. |
