Introduction
AISI 304L stainless steel coil is a versatile and widely used austenitic stainless steel known for its excellent formability, good corrosion resistance, and a smooth surface finish. This low-carbon variation of the popular AISI 304 grade offers improved resistance to a specific type of corrosion, making it ideal for certain applications.
Composition
AISI 304L shares the core elements of 304 stainless steel:
Chromium (18-20%): Provides the foundation for corrosion resistance.
Nickel (8-10.5%): Enhances corrosion resistance and formability.
The key difference lies in the carbon content:
304L: Lower Carbon Content (Less than 0.03%) - This minimizes the risk of chromium carbide precipitation during welding, a phenomenon that can deteriorate corrosion resistance in the weld zone of standard 304 stainless steel.
Characteristics
Excellent Formability: AISI 304L exhibits exceptional formability, allowing for easy shaping and drawing during fabrication. This makes it ideal for applications requiring complex shapes.
Good Corrosion Resistance: AISI 304L offers good corrosion resistance in various environments, including atmospheric conditions, fresh water, and mildly acidic or alkaline solutions. Proper surface finishing and maintaining cleanliness are important for optimal performance.
Improved Weldability: Compared to standard 304. the lower carbon content of 304L minimizes chromium carbide precipitation, leading to better weldability and reduced risk of corrosion around the weld zone. However, proper welding procedures are still recommended.
Strength and Hardness: While not the strongest stainless steel, 304L offers moderate strength and hardness compared to other austenitic grades. These properties can be further enhanced through cold working.
Temperature Resistance: AISI 304L exhibits good resistance to oxidation and maintains its strength at elevated temperatures up to 870°C (1598°F).
Ductile: AISI 304L is ductile, meaning it can deform under stress without breaking, making it suitable for applications requiring some flexibility.
Uses
Due to its versatility, good corrosion resistance, and improved weldability, AISI 304L stainless steel coil finds application in various industries, including:
Chemical Processing Equipment: Tanks, piping, and vessels handling mild chemicals can benefit from the corrosion resistance and weldability of 304L, especially when welding is involved.
High-Purity Applications: Components requiring a low carbon content to avoid contamination, such as in pharmaceutical or food processing equipment, can utilize 304L.
Food Processing Equipment: Tanks, containers, and utensils used in food processing benefit from the corrosion resistance, cleanability, and formability of 304L.
Architectural Applications: Building facades, railings, trim, and decorative elements often utilize 304L due to its aesthetics, formability, corrosion resistance, and suitability for welding.
Welding Applications: Due to its improved weldability, 304L is often preferred over 304 when welding is a significant part of the fabrication process.
Additional Points
AISI 304L comes in various standard specifications, such as ASTM A240/ASME SA240. ensuring consistent material properties.
AISI 304L is not magnetic in its annealed (untreated) state. However, it can become slightly magnetic after cold working.
When high corrosion resistance is the primary concern and welding is not involved, standard AISI 304 might be a suitable choice due to its slightly lower cost.
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. |
