304 & 304L
GRADE
Grade 304/304L (UNS S30400/S30403, EN 1.4301/1.4307) is the most widely used Austenitic stainless steel. It accounts for more than 50% of all stainless steel produced, represents between 50% - 60% of consumption of stainless materials and fins applications in almost every industry.
Grade 304L is a low carbon chemistry of 304, it combined with an addition of nitrogen enables 304L to meet the mechanical properties of 304. Grade 304L often used to avoid possible sensitization corrosion in welded components.
It’s non-magnetic in the annealed condition, but can become slightly magnetic as a result of cold working or welding. It can be easily welded and processed by standard fabrication practices.
It has excellent resistance to atmospheric corrosion, moderately oxidizing and reducing environments, as well as intergranular corrosion in the as-welded condition. It also has excellent strength and toughness at cryogenic temperatures as well.
PROPERTIES
- Corrosion resistance
- Prevention of product contamination
- Resistance to oxidation
- Ease of fabrication
- Excellent formability
- Beauty of appearance
- Ease of cleaning
- High strength with low weight
- Good strength and toughness at cryogenic temperatures
- Ready availability of a wide range of product forms
CHEMICAL COMPOSITION AND PHYSICAL PROPERTIES FOR 304
| Item | C% | Si% | Mn% | P% | S% | Ni% | Cr% | N% | Others |
|---|---|---|---|---|---|---|---|---|---|
| Min | --- | --- | --- | --- | --- | 8.00 | 18.00 | --- | --- |
| Max | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 10.50 | 20.00 | --- | --- |
| Item | Tensile Test | Hardness Test | ||||
|---|---|---|---|---|---|---|
| 0.2%Y.S. | 1%Y.S. | T.S. | EL (%) | HRB | HV | |
| Min | 205 | --- | 520 | 40 | --- | --- |
| Max | N/mm2 | --- | N/mm2 | --- | 90 | 200 |
CHEMICAL COMPOSITION AND PHYSICAL PROPERTIES FOR 304L
| Item | C% | Si% | Mn% | P% | S% | Ni% | Cr% | N% | Others |
|---|---|---|---|---|---|---|---|---|---|
| Min | --- | --- | --- | --- | --- | 8.00 | 17.50 | --- | --- |
| Max | 0.03 | 0.75 | 2.00 | 0.045 | 0.030 | 12.00 | 19.50 | 0.100 | --- |
| Item | Tensile Test | Hardness Test | ||||
|---|---|---|---|---|---|---|
| 0.2%Y.S. | 1%Y.S. | T.S. | EL (%) | HRB | HV | |
| Min | 170 | --- | 485 | 40 | --- | --- |
| Max | Mpa | --- | Mpa | --- | 92 | --- |
APPLICATION
- Kitchen benches, such as preparation areas, work surfaces
- Food and beverage processing, such as sinks, refrigerators, beer brewing, milk processing, wine making , cream dispensers and all types of dairy equipment
- Chemical containers
- Heat exchangers
- Architectural trim and molding
- Petrochemical and petroleum refining
- Woven or welded screens for mining, quarrying and water filtration
- Medical or pharmaceutical processing for environments such as clean rooms
SPECIFICATIONS
- ASTM A240M – Chromium and Chromium – Nickel Stainless Steel Plate, Sheet and Strip for Pressure Vessels and for General Applications.
- ASTM 480M – General Requirements for Flat Rolled Stainless and Heat-Resisting Steel Plate, Sheet and Strip
- EN 10088-2 (1.4301/1.4307) – Stainless Steel Technical delivery conditions for sheet, plate and strip of corrosion resisting steels for general purposes
PRODUCT FORMS
RAW MATERIAL FINISHS & AVAILABLE SIZES
| No.1 | A rough, dull and non-uniform surface, which results from hot rolling to the specified thickness, followed by annealing and descaling. | |||||
|---|---|---|---|---|---|---|
| Range | 914 (3') | 1000 | 1219 (4') | 1250 | 1500 | 1524 (5') |
| 3.0mm ~ 10.0mm | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
| 12.0mm ~ 100.0mm | ◆ | ◆ | ||||
| 2D | A uniform, dull silver gray finish, which results from cold rolling followed by annealing and descaling. | |||||
| Range | 914 (3') | 1000 | 1219 (4') | 1250 | 1500 | 1524 (5') |
| 0.3mm ~ 3.0mm | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
| 30GA ~ 11GA | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
| 0.012" ~ 0.1196" | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
| 2B (Mill Finish) |
A bright, cold-rolled finish resulting in the same manner as 2D finish, except that the annealed and descaled sheet received a final light roll pass through polished rolls. This is the general-purpose cold-rolled finish that can be used, or a preliminary step to polishing. | |||||
| Range | 914 (3') | 1000 | 1219 (4') | 1250 | 1500 | 1524 (5') |
| 0.3mm ~ 6.0mm | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
| 30GA ~ 4GA | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
| 0.012" ~ 0.2242" | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
| BA (Bright Anneal) |
A highly reflective, mirror like finish, which was produced by bright annealing under Oxygen-free atmospheric conditions following cold rolling using polished rolls. | |||||
| Range | 914 (3') | 1000 | 1219 (4') | 1250 | 1500 | 1524 (5') |
| 0.3mm ~ 2.0mm | ◇ | ◆ | ◆ | ◆ | ||
| 30GA ~ 14GA | ◇ | ◆ | ◆ | ◆ | ||
| 0.012" ~ 0.0747" | ◇ | ◆ | ◆ | ◆ | ||
