High-strength Corrosion And Erosion Protection For Boiler Tubes
1cr18ni9ti tube shields offer excellent resistance to intergranular corrosion and erosion, ideal for protecting boiler tubes in high-temperature flue gas environments.
High-strength Corrosion And Erosion Protection For Boiler Tubes
1cr18ni9ti tube shields offer excellent resistance to intergranular corrosion and erosion, ideal for protecting boiler tubes in high-temperature flue gas environments.
1Cr18Ni9Ti (SUS321) is an austenitic stainless steel widely used in China. Its designation reflects its composition: ~0.1% C, 18% Cr, and 9% Ni, with titanium added to enhance resistance to intergranular corrosion.
Due to intergranular corrosion issues in early 304 steels, titanium was added to bind carbon and prevent Cr23C6 formation. This innovation formed 1Cr18Ni9Ti. However, advancements in smelting allowed for low-carbon stainless grades like 304 (0Cr18Ni9) to become viable alternatives. 304 now dominates many industries worldwide, although 321 is still used in certain Chinese enterprises.
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 17.00 – 19.00 |
| Nickel (Ni) | 9.00 – 12.00 |
| Titanium (Ti) | ≥ 5 × C |
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 520 | MPa |
| Yield Strength | ≥ 205 | MPa |
| Elongation | ≥ 40 | % |
| Hardness | ≤ 187 | HB |
Both are austenitic grades, but 321 contains titanium for better high-temperature resistance and intergranular corrosion protection, whereas 304 is more cost-effective and common.
| Property | 321 (1Cr18Ni9Ti) | 304 (0Cr18Ni9) |
|---|---|---|
| Stabilizer | Titanium (Ti) | None |
| Corrosion Resistance | High (Intergranular) | Excellent (General) |
| High-Temperature Use | Up to 900°C | Up to 800°C |
| Mechanical Properties | 520/205 MPa | 520/205 MPa |
| Weldability | Good (Post-weld treatment advised) | Excellent (No treatment required) |
| Applications | Aerospace, high-temp piping | Food, chemical, general structures |
| Cost | Higher | Lower |
We stock stainless steels in a multitude of shapes and sizes.
We support our stainless steel stock with a wide range of shapes and sizes to suit your engineering applications. We hold thirteen different types of shapes to support the grades of material we stock, including bars, sheets and plates. Our stainless steel shapes are available in various grades, including 304, 304L, 316, and 316L, each offering unique properties to meet specific application requirements. Whether you need flat bars for structural support, round bars for machining, or sheets and plates for fabrication, we have the right stainless steel shape for your project.
Stainless Carbon Steel Composite Pipe
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Material-Specific Erosion Shields
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| Grade | C (% max) | Mn (% max) | Si (% max) | P (% max) | S (% max) | Cr (%) | Ni (%) | Mo (%) | N (% max) |
|---|---|---|---|---|---|---|---|---|---|
| 304 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-11.0 | - | 0.10 |
| 304L | 0.03 | 2.00 | 1.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-12.0 | - | 0.10 |
| 316 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 0.10 |
| 316L | 0.03 | 2.00 | 1.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 0.10 |
The low carbon content in 304L and 316L enhances weldability, while molybdenum in 316 and 316L improves resistance to pitting and crevice corrosion, making 1Cr18Ni9Ti Tube Shield ideal for harsh environments.
| Grade | Tensile Strength (min, MPa) | Yield Strength (min, MPa) | Elongation (min, %) | Hardness (max, HB) | Hardness (max, HRB) |
|---|---|---|---|---|---|
| 304 | 515 | 205 | 40 | 201 | 92 |
| 304L | 485 | 170 | 40 | 201 | 92 |
| 316 | 515 | 205 | 40 | 217 | 95 |
| 316L | 485 | 170 | 40 | 217 | 95 |
These mechanical properties make 1Cr18Ni9Ti Tube Shield suitable for applications requiring high strength and corrosion resistance, such as architectural structures, marine environments, and chemical processing.
In order to solve the cumbersome and difficult to remember stainless steel grades, improve the practicability of the brand representation, and the contrast with the international standard grades, China has formulated the "Universal Code System for Steel and Alloy Grades", such as 06Cr19Ni10, corresponding to 304. Different grades of stainless steel have different ingredients, but they all have a national standard. The standards of each country are also different.
| No | China (GB) | Japan (JIS) | American | Korea (KS) | EU (BS EN) | India (IS) | Australia (AS) | Taiwan (CNS) | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Old | New (07.10) | SUS | ASTM | UNS | STS | EN | IS | AS | CNS | |
| Austenitic Stainless Steel | ||||||||||
| 1 | 1Cr17Mn6Ni5N | 12Cr17Mn6Ni5N | SUS201 | 201 | S20100 | STS201 | 1.4372 | 10Cr17Mn6Ni4N20 | 201-2 | 201 |
| 2 | 1Cr18Mn8Ni5N | 12Cr18Mn9Ni5N | SUS202 | 202 | S20200 | STS202 | 1.4373 | — | — | 202 |
| 3 | 1Cr17Ni7 | 12Cr17Ni7 | SUS301 | 301 | S30100 | STS301 | 1.4319 | 10Cr17Ni7 | 301 | 301 |
| 4 | 0Cr18Ni9 | 06Cr19Ni10 | SUS304 | 304 | S30400 | STS304 | 1.4301 | 07Cr18Ni9 | 304 | 304 |
| 5 | 00Cr19Ni10 | 022Cr19Ni10 | SUS304L | 304L | S30403 | STS304L | 1.4306 | 02Cr18Ni11 | 304L | 304L |
| 6 | 0Cr19Ni9N | 06Cr19Ni10N | SUS304N1 | 304N | S30451 | STS304N1 | 1.4315 | — | 304N1 | 304N1 |
| 7 | 0Cr19Ni10NbN | 06Cr19Ni9NbN | SUS304N2 | XM21 | S30452 | STS304N2 | — | — | 304N2 | 304N2 |
| 8 | 00Cr18Ni10N | 022Cr19Ni10N | SUS304LN | 304LN | S30453 | STS304LN | — | — | 304LN | 304LN |
| 9 | 1Cr18Ni12 | 10Cr18Ni12 | SUS305 | 305 | S30500 | STS305 | 1.4303 | — | 305 | 305 |
| 10 | 0Cr23Ni13 | 06Cr23Ni13 | SUS309S | 309S | S30908 | STS309S | 1.4833 | — | 309S | 309S |
| 11 | 0Cr25Ni20 | 06Cr25Ni20 | SUS310S | 310S | S31008 | STS310S | 1.4845 | — | 310S | 310S |
| 12 | 0Cr17Ni12Mo2 | 06Cr17Ni12Mo2 | SUS316 | 316 | S31600 | STS316 | 1.4401 | 04Cr17Ni12Mo2 | 316 | 316 |
| 13 | 0Cr18Ni12Mo3Ti | 06Cr17Ni12Mo2Ti | SUS316Ti | 316Ti | S31635 | — | 1.4571 | 04Cr17Ni12MoTi20 | 316Ti | 316Ti |
| 14 | 00Cr17Ni14Mo2 | 022Cr17Ni12Mo2 | SUS316L | 316L | S31603 | STS316L | 1.4404 | 02Cr17Ni12Mo2 | 316L | 316L |
| 15 | 0Cr17Ni12Mo2N | 06Cr17Ni12Mo2N | SUS316N | 316N | S31651 | STS316N | — | — | 316N | 316N |
| 16 | 00Cr17Ni13Mo2N | 022Cr17Ni13Mo2N | SUS316LN | 316LN | S31653 | STS316LN | 1.4429 | — | 316LN | 316LN |
| 17 | 0Cr18Ni12Mo2Cu2 | 06Cr18Ni12Mo2Cu2 | SUS316J1 | — | — | STS316J1 | — | — | 316J1 | 316J1 |
| 18 | 00Cr18Ni14Mo2Cu2 | 022Cr18Ni14Mo2Cu2 | SUS316J1L | — | — | STS316J1L | — | — | — | 316J1L |
| 19 | 0Cr19Ni13Mo3 | 06Cr19Ni13Mo3 | SUS317 | 317 | S31700 | STS317 | — | — | 317 | 317 |
| 20 | 00Cr19Ni13Mo3 | 022Cr19Ni13Mo3 | SUS317L | 317L | S31703 | STS317L | 1.4438 | — | 317L | 317L |
| 21 | 0Cr18Ni10Ti | 06Cr18Ni11Ti | SUS321 | 321 | S32100 | STS321 | 1.4541 | 04Cr18Ni10Ti20 | 321 | 321 |
| 22 | 0Cr18Ni11Nb | 06Cr18Ni11Nb | SUS347 | 347 | S34700 | STS347 | 1.4550 | 04Cr18Ni10Nb40 | 347 | 347 |
| Austenitic-Ferritic Stainless Steel (Duplex) | ||||||||||
| 23 | 0Cr26Ni5Mo2 | — | SUS329J1 | 329 | S32900 | STS329J1 | 1.4477 | — | 329J1 | 329J1 |
| 24 | 00Cr18Ni5Mo3Si2 | 022Cr19Ni5Mo3Si2N | SUS329J3L | — | S31803 | STS329J3L | 1.4462 | — | 329J3L | 329J3L |
| Ferritic Stainless Steel | ||||||||||
| 25 | 0Cr13Al | 06Cr13Al | SUS405 | 405 | S40500 | STS405 | 1.4002 | 04Cr13 | 405 | 405 |
| 26 | — | 022Cr11Ti | SUH409 | 409 | S40900 | STS409 | 1.4512 | — | 409L | 409L |
| 27 | 00Cr12 | 022Cr12 | SUS410L | — | — | STS410L | — | — | 410L | 410L |
| 28 | 1Cr17 | 10Cr17 | SUS430 | 430 | S43000 | STS430 | 1.4016 | 05Cr17 | 430 | 430 |
| 29 | 1Cr17Mo | 10Cr17Mo | SUS434 | 434 | S43400 | STS434 | 1.4113 | — | 434 | 434 |
| 30 | — | 022Cr18NbTi | — | — | S43940 | — | 1.4509 | — | 439 | 439 |
| 31 | 00Cr18Mo2 | 019Cr19Mo2NbTi | SUS444 | 444 | S44400 | STS444 | 1.4521 | — | 444 | 444 |
| Martensitic Stainless Steel | ||||||||||
| 32 | 1Cr12 | 12Cr12 | SUS403 | 403 | S40300 | STS403 | — | — | 403 | 403 |
| 33 | 1Cr13 | 12Cr13 | SUS410 | 410 | S41000 | STS410 | 1.4006 | 12Cr13 | 410 | 410 |
| 34 | 2Cr13 | 20Cr13 | SUS420J1 | 420 | S42000 | STS420J1 | 1.4021 | 20Cr13 | 420 | 420J1 |
| 35 | 3Cr13 | 30Cr13 | SUS420J2 | — | — | STS420J2 | 1.4028 | 30Cr13 | 420J2 | 420J2 |
| 36 | 7Cr17 | 68Cr17 | SUS440A | 440A | S44002 | STS440A | — | — | 440A | 440A |
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