310 stainless steel coil shares many excellent properties with 310 stainless steel sheets, but its coiled form makes it more suitable for continuous processing and various manufacturing applications.
310 stainless steel coil shares many excellent properties with 310 stainless steel sheets, but its coiled form makes it more suitable for continuous processing and various manufacturing applications. Here’s a comprehensive introduction to 310 stainless steel coil:
I. Overview
310 stainless steel coil is a rolled product with high - temperature and corrosion - resistant characteristics. Its coiled shape allows for convenient storage, transportation, and further processing, such as uncoiling for stamping, forming, or cutting into specific parts. It is widely used in industries that require materials capable of withstanding harsh environments, including the petrochemical industry, heat treatment facilities, and high - temperature exhaust systems.
II. Chemical Composition
The chemical composition of 310 stainless steel coil is consistent with that of 310 stainless steel in other forms, as shown in the following table:
| Element | Content Range (%) | Role |
|---|---|---|
| Carbon (C) | ≤0.25 | Contributes to the steel's strength. However, higher carbon can reduce corrosion resistance and increase the risk of carbide precipitation during welding. |
| Chromium (Cr) | 24.0 - 26.0 | Forms a passive chromium oxide film on the surface, providing excellent corrosion resistance and enhancing high - temperature oxidation resistance. |
| Nickel (Ni) | 19.0 - 22.0 | Improves the steel's ductility, toughness, and corrosion resistance, especially in reducing environments. It also helps maintain the austenitic structure of the steel. |
| Manganese (Mn) | ≤2.0 | Functions as a deoxidizer and also contributes to the steel's strength. It can partially replace nickel in maintaining the austenitic structure. |
| Silicon (Si) | ≤1.5 | Enhances the steel's resistance to high - temperature scaling and improves its strength at elevated temperatures. |
| Phosphorus (P) | ≤0.045 | An impurity that, if present in large amounts, can reduce the steel's impact toughness and cause cold brittleness. |
| Sulfur (S) | ≤0.030 | An impurity that can deteriorate the steel's hot - working performance, such as causing hot shortness during forging and rolling. |
III. Mechanical Properties
The mechanical properties of 310 stainless steel coil are as follows, which ensure its reliability in various applications:
| Property | Value | |
|---|---|---|
| Tensile Strength (MPa) | ≥520 | Enables the coil to withstand significant pulling forces during processing and in service without breaking. |
| Yield Strength (MPa) | ≥205 | Indicates the stress at which the material starts to deform plastically, crucial for maintaining dimensional accuracy in formed parts. |
| Elongation at Break (%) | ≥40 | Provides good formability, allowing the coil to be bent, rolled, or shaped without cracking during manufacturing processes. |
| Hardness (HB) | ≤187 | A relatively low hardness value makes the coil easy to work with while still maintaining sufficient strength for most applications. |
IV. Standard Specifications of Corresponding Countries
| Country/Region | Standard |
|---|---|
| United States | ASTM A240/A240M - 22 (also applicable for coils as it covers stainless steel plate, sheet, and strip) |
| European Union | EN 10088 - 2:2005 (specifies requirements for stainless steel semi - finished products, including coils) |
| China | GB/T 24511 - 2017 (applies to stainless steel hot - rolled and cold - rolled coils for pressure equipment and general applications) |
V. Popular Grades
310S (06Cr25Ni20): This is a low - carbon version of 310 stainless steel. The reduced carbon content (≤0.08%) significantly reduces the risk of carbide precipitation during welding, thereby improving intergranular corrosion resistance. It is commonly used in continuous - use furnace parts, heat - treatment fixtures, and exhaust systems where welding is involved, as its improved weldability ensures the integrity of the final product.
310H (07Cr25Ni20): With a higher carbon content (0.04 - 0.10%) compared to 310S, 310H offers enhanced strength and creep resistance at elevated temperatures. It is the preferred choice for applications that demand long - term exposure to high temperatures, such as boiler components, high - temperature furnace tubes, and parts in power generation equipment where maintaining structural stability under thermal stress is essential.
VI. Popular Questions and Answers
Q: Can 310 stainless steel coil be used in food - processing equipment?
A: Generally, 310 stainless steel is not the first choice for direct food - contact applications. Although it has good corrosion resistance, its relatively high carbon content may not meet the strict hygiene and corrosion - resistance requirements of food processing. Grades like 304 or 316 stainless steel, which have lower carbon content and better resistance to common food - related chemicals (such as acids from fruits and salts), are more commonly used. However, if the 310 stainless steel coil is properly passivated and meets specific food - safety standards, it can be used in some non - direct contact or low - risk food - processing equipment components.
Q: How should 310 stainless steel coil be stored to prevent corrosion?
A: Store 310 stainless steel coil in a dry, well - ventilated area away from sources of moisture, chemicals, and contaminants. Avoid stacking it directly on the ground; instead, use wooden pallets or racks to keep it elevated. If possible, cover the coil with a breathable protective material, such as a plastic film with ventilation holes, to prevent dust and moisture accumulation. In humid environments, consider using desiccants around the stored coils to reduce the relative humidity and further protect against corrosion.
Q: What are the common forming processes for 310 stainless steel coil?
A: Common forming processes for 310 stainless steel coil include rolling, bending, stamping, and drawing. Rolling can be used to change the thickness of the coil or to give it a specific shape, such as in the production of pipes or tubes. Bending is often employed to create curved parts for exhaust systems or architectural components. Stamping is used to produce complex - shaped parts, like brackets or covers, by applying high pressure with a die. Drawing can be used to create deep - drawn components, such as cups or bowls. When performing these processes, appropriate lubricants and tooling materials should be used to prevent scratching and cracking of the coil, and the forming speed and temperature may need to be adjusted according to the specific requirements of the 310 stainless steel grade and the final product.
| STS | USA | UNS | CHINA | EURONORM | RUSSIA | SWEDISH | JAPANESE | |
|---|---|---|---|---|---|---|---|---|
| GRADE | AISI/ASTM | NO | GB | NO | NAME | GOST | SS | JIS |
| 201 | 201 | S20100 | 12Cr17Mn6Ni5N | 1.4372 | - | - | - | SUS 201 |
| 301 | 301 | S30100 | 12Cr17Ni7 | 1.4310 | X 12 CrNi 17 7 | - | 2331 | SUS 301 |
| 303 | 303 | S30300 | 1Cr18Ni9MoZr | 1.4305 | X 10 CrNiS 18 9 | - | 2346 | SUS 303 |
| 304 | 304 | S30400 | 06Cr18Ni9 | 1.4301 | X 6 CrNi 18 10 | 08KH18N10 06KH18N11 |
2332 | SUS 304 |
| 304L | 304L | S30403 | 022Cr19Ni10 | 1.4307 | X 3 CrNi 18 10 | 03KH18N11 | 2352 | SUS 304L |
| 316 | 316 | S31600 | 0Cr17Ni12Mo2 | 1.4401 | X 6 CrNiMo 17 12 2 | - | 2347 | SUS 316 |
| 316L | 316L | S31603 | 022Cr17Ni12Mo2 | 1.4404 | X 3 CrNiMo 17 12 2 | - | 2348 | SUS 316L |
| 316Ti | 316Ti | S31635 | 0Cr18Ni12Mo2Ti | 1.4571 | X 6 CrNiMoTi 17 12 2 | 08KH17N13M2T 10KH17N13M2T |
2350 | - |
| 321 | 321 | S32100 | 0Cr18Ni11Ti | 1.4541/1.4878 | X 6 CrNiTi 18 10 | 12KH18N10T | 2337 | SUS 321 |
| 347 | 347 | S34709 | 0Cr18Ni11Nb | 1.4550 | X 6 CrNiNb 18 10 | - | 2338 | SUS 347 |
| 309S | 309S | S30908 | 0Cr23N13 | 1.4833 | X 6 CrNi 22 13 | 20KH23N18 | - | SUS 309S |
| 310S | 310S | S31008 | 06Cr25Ni20 | 1.4842 | X 6 CrNi 25 20 | 20KH25N20S2 | 2361 | SUS 310S |
| 416 | 416 | S41600 | Y1Cr13 | 1.4005 | X12CrS13 | - | 2380 | SUS 416 |
| 2205 | 2205 | S32205/S31803 | 00Cr22Ni5Mo3N | 1.4462 | X2CrNiMoN22-5-3 | 02Ch22N5AM2 | 2377 | SUS 329J3L |
| 2507 | 2507 | S32750 | 00Cr25Ni7Mo4N | 1.4410 | X 2 CrNiMoN 25-7-4 | - | - | - |
| 904L | 904L | N08904 | - | 1.4539 | - | - | - | - |
| 254SMO | 254SMO | S31254 | - | 1.4547 | X1CrNiMoCuN20-18-7 | - | 2378 | - |
| 253MA | 253MA | S30815 | - | 1.4835 | X9CrNiSiNCe21-11-2 | - | 2368 | - |
| 17-4PH/630 | 17-4PH/630 | S17400 | 0Cr17Ni4Cu4Nb | 1.4542 | X5CrNiCuNb16-4 | 05Ch16N4D2B | - | SUS630 |
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