| Customization: | Available |
|---|---|
| Type: | 300 Sreise Tube |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
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Stainless steel 304L is also known as stainless steel 1.307 respectively.Type 304L is the low carbon version of 304. It is used in heavy gauge components for improved weldability. Some products such as plate and pipe may be available as "dual certified" material that meets the criteria for both 304 and 304L. 304H, a high carbon content variant, is also available for use at high temperatures. Property given in this data sheet is typical for flat rolled products covered by ASTM A240/A240M. It is reasonable to expect specifications in these standards to be similar but not necessarily identical to those given in this data sheet.
The chemical composition of stainless steel grade 304 is outlined in the following table.
| C | Si | Mn | P | S | Cr | Ni |
| 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 18.00-20.00 | 8.00-12.00 |
| Grade | UNS | DIN | EN | AMS | ASTM | JIS | |
| 304 | S30400 |
|
1.4301 1.4307 |
ASTM A313 ASTM A580 |
- | ||
304 stainless steel cannot be heat treated-instead it can be strengthened by cold working. It is weakest in the annealed condition, and is strongest in the full-hard condition. The tensile yield strength ranges from 210 to 1,050 MPa (30,000 to 153,000 psi).
The density is 7,900 kg/m3 (0.286 lb/cuin), and its modulus of elasticity ranges from 183 to 200 GPa (26.6×106 to 29.0×106 psi).
304, 304H, and 304L all possess the same nominal chromium and nickel content and also possess the same corrosion resistance, ease of fabrication, and weldability. The difference between 304, 304H, and 304L is the carbon content, which is < 0.08, < 0.1, and < 0.035% respectively (also see UNS designations S30400, S30409, & S30403 respectively). 304 has both the H=High and the L=Low carbon variants.
The carbon content of 304H (UNS S30409) is restricted to 0.04-0.10%, which provides optimal high-temperature strength.
The carbon content of 304L (UNS 30403) is restricted to a maximum of 0.035%, which prevents sensitization during welding. Sensitization is the formation of chromium carbides along grain boundaries when stainless steel is exposed to temperatures in the approximate range of 480-820 °C (900-1,500 °F). The subsequent formation of chromium carbide results in reduced corrosion resistance along the grain boundary, leaving the stainless steel susceptible to unanticipated corrosion in an environment where 304 would be expected to be corrosion resistant. This grain boundary corrosive attack is known as intergranular corrosion.[13]
The carbon content of 304 (UNS 30400) is restricted to a maximum of 0.08% and is not useful for corrosive applications where welding is required, such as tanks and pipes where corrosive solutions are involved, and 304L is preferred. Its lack of a minimum carbon content is not ideal for high-temperature applications where optimal strength is required, thus, 304H is usually preferred. Therefore 304 is typically restricted to bars that will be machined into components where welding is not required or thin sheets that are formed in articles such as kitchen sinks or cookware that are also not welded.
Carbon content has a strong influence on room temperature strength and thus the specified minimum tensile properties of 304L are 34 MPa (5,000 psi) lower than for 304. However, nitrogen also has a strong influence on room temperature strength and a tiny addition of nitrogen produces 304L with the same tensile strength as 304. Thus, practically all 304L is produced as dual certified 304/304L, meaning it meets the minimum carbon content of 304L and also meets the minimum tensile strength of 304.
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