Stainless steel 1Cr18Ni9Ti is an ordinary stainless steel (SUS321), and its organization category for austenitic type. 1Cr18Ni9Ti in 18, 9 represent chromium (%), nickel (%) content. Is China’s stainless steel material grade. Used in the production of acid-resistant containers and equipment lining, antimagnetic instrumentation, and medical equipment, with good resistance to intergranular corrosion.
1. Summary
The addition of carbon stabilizing element Ti to 304 steel grade inhibits grain boundary sensitization and can be used in the sensitization range (450~8500C).
2. Features
1) Excellent resistance to intergranular corrosion;
2) Used for parts that cannot be heat treated after welding;
3) Excellent welding performance and better processing performance.
3. Scope of Application
Heat exchangers, pipes, expansion joints, aviation equipment, exhaust pipes, boiler parts, and parts/equipment that cannot be heat treated after assembly.
4. Chemical composition (JIS G 4305-2005) (wt%)
Chemical composition | C | Si | Mn | P | S | Cr | Ni | Ti |
Standard | ￡0.08 | ￡1.0 | ￡2.0 | ￡0.045 | ￡0.030 | 17.0~19.0 | 9.0~13.0 | ≥ 5XC% |
| General | 0.04 | 0.50 | 1.3 | 0.026 | 0.001 | 17.70 | 9.10 | 0.30 |
5. Performance (JIS G 4305-2005)
Distinguish | Mechanical properties | |||
Ys (Mpa) | Ts (Mpa) | El (%) | Hv | |
Standard | ≥ 205 | ≥ 520 | ≥ 40 | ≤ 200 |
| General | 270 | 610 | 51 | 155 |
6. Physical Properties
| Density (g/cm3) | Magnetic | Specific heat (J/g.0C) | Thermal conductivity 1000C(W/m. 0C) | Thermal expansion rate 20~1000C(10-6/0C) |
| 7.93 | No | 0．5 | 16.1 | 16．7 |
7. Heat Treatment
Melting point: 1400~14250C;
Solution treatment: 920~11500C. To
8. Use Status
1) Annealing and solid solution state:
NO. 1, 2D, 2B, and various other surface treatment states
2) Rolling hard.
9. Matters Needing Attention
Magnetism will appear after processing;
Due to the addition of Ti, its surface color is relatively poor with 304.
Which is more resistant to high temperatures, SUS304 or SUS321?
The melting point of SUS304 is above and below 1400 degrees Celsius; SUS321: Ti is added to 304 steel, which is only suitable for use at a temperature of 430℃-900℃.Therefore, SUS304 is more high-temperature resistant than SUS321.
How does the Chemical Composition of SUS321 Differ from the Chemical Composition of National Standard 321 Stainless Steel?
SUS321 stainless steel (UNS S32100) is a very stable stainless steel. At temperatures up to 800-1500F (427-816C), chromium carbide precipitation conditions can still maintain good resistance to intergranular corrosion.
What Is SUS321 Stainless Steel Made Of?
SUS321 belongs to the Japanese standard titanium-containing austenitic stainless steel, the implementation of the standard “JIS G4303-2005”.
SUS321 austenitic stainless steel has good corrosion resistance in the atmosphere and is widely used in petrochemical, electric power, bridges, and automotive industries [1]. But stainless steel “stainless” is not absolute, due to the special service environment, stainless steel corrosion will occur. Media concentration, pH value, temperature, and other factors will have a greater impact on the corrosion resistance of stainless steel.
For example, in the 450 ~ 850 ℃ sensitization temperature range for long-term use, stainless steel will experience intergranular corrosion. The mechanism is that C and Cr at the grain boundaries, the formation of Cr23C6 and precipitation so that the grain boundaries the reduction of Cr content, which is known as “chromium depletion”. Cr element is one of the main elements to inhibit intergranular corrosion, when the Cr content at the grain boundary is less than 12%, the chance of intergranular corrosion will become larger.
What Is 321H Material?
321H belongs to American Standard austenitic heat-resistant steel forgings, the implementation of standards: ASTM A959-2011.
321H is a titanium-stabilized austenitic stainless steel with good overall corrosion resistance. It has excellent resistance to intergranular corrosion at temperatures exposed to carbon carbide precipitation in the range of 800-1500F (427-816°C). The alloy resists oxidation to 1500F (816C) and has higher Creep and stress rupture properties than alloys 304 and 304L. It also has good low-temperature toughness.