SUS316(L) – 00Cr17Ni14Mo2
With the addition of Mo (2-3%), it achieves excellent pitting and corrosion resistance, and outstanding high-temperature creep strength.
Characteristics and practical applications:
| Difference | SUS316(L) |
| Characteristics | Excellent resistance to intergranular corrosion |
| Usage | Boiler tubes, marine structures |
Chemical composition: (Unit: wt%)
| Specification | C | Si | Mn | P | S | Cr | Ni | Others |
| SUS316 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0～18.0 | 10.0～14.0 | Mo: 2～3 |
| SUS316L | ≤0.03 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0～18.0 | 12.0～15.0 | Mo: 2～3 |
Mechanical Properties:
| Specification | YS（Mpa） | TS（Mpa） | EL（%） | Hv |
| TYPE SUS316 | ≥205 | ≥520 | ≥40 | ≤200 |
| TYPE SUS316L | ≥175 | ≥480 | ≥40 | ≤200 |
SUS304 – 0Cr18Ni9
As a fundamental type under the austenite series, it boasts excellent corrosion resistance, heat resistance, low-temperature strength, and mechanical properties. It does not harden after heat treatment, and exhibits almost no magnetism.
Practical uses and characteristics:
| Difference | SUS304 | SUS304L |
| Characteristics | Austenitic steel is the most commonly used steel variety; It exhibits excellent corrosion and heat resistance; Its low-temperature strength and mechanical properties are superior; As a single-phase austenitic structure, it does not harden with heat treatment. | Compared to 304, it has superior corrosion resistance. |
| Usage | 1. Tableware, exterior materials, construction materials, automotive parts 2. Medical devices, chemicals, food processing, fiber industry 3. Marine components. | For chemical, coal, and petroleum industries requiring high resistance to intergranular corrosion in their equipment, |
Chemical composition: (Unit: wt%)
| Specification | C | Si | Mn | P | S | Cr | Ni | Others |
| SUS316 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0～18.0 | 10.0～14.0 | Mo: 2～3 |
| SUS316L | ≤0.03 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0～18.0 | 12.0～15.0 | Mo: 2～3 |
Mechanical Properties:
| Specification | YS（Mpa） | TS（Mpa） | EL（%） | Hv |
| TYPE SUS316 | ≥205 | ≥520 | ≥40 | ≤200 |
| TYPE SUS316L | ≥175 | ≥480 | ≥40 | ≤200 |
SUS317L – 00Cr19Ni13Mo3
| Steel Type | SUS317L-00Cr19Ni13Mo3 |
| Characteristics | Type 317L steel demonstrates superior seawater resistance and stress corrosion cracking (SCC) resistance compared to Type 316L. |
| Applications | It is utilized in chemical vessels, chemical product reactors, and other equipment requiring high corrosion resistance. |
Chemical composition: (Unit: wt%)
| Specification | C | Si | Mn | P | S | Ni | Cr | Mo | OTHERS |
| TYPE 317L | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 11.0-15.0 | 18.0-20.0 | 3.0-4.0 | – |
Mechanical Properties:
| Specification | YS（Mpa） | TS（Mpa） | EL（%） | Hv |
| TYPE 317L | ≥176 | ≥480 | ≥40 | ≤200 |
SUS 430
1. Overview
This ferritic stainless steel, widely used, contains 17% Cr and exhibits a mixed phase (α+γ) at high temperatures. Below 1000°C, it has a single phase BCC structure.
2. Characteristics:
1) It exhibits excellent deep-drawability, similar to that of 304 steel.
2) It possesses strong corrosion resistance to oxidative acids and has a certain level of resistance to alkalis, most organic acids, and inorganic acids. Its stress corrosion cracking resistance is superior to 304 steel.
3) It has a lower coefficient of thermal expansion than 304 steel, and high oxidation resistance, making it suitable for heat-resistant equipment.
4) Cold-rolled products have good surface brightness and aesthetic appeal.
5) It is more affordable than 304 steel, often used as a replacement.
3. Applications
It is primarily used for high-polish decorative purposes in mild atmospheres, such as gas stove surfaces, appliance components, cutlery, interior building decor, washbasins, washing machine drums, etc.
4. Chemical Composition (JIS G 4305-2005)
| Chemical Composition | C | Si | Mn | P | S | Cr |
| Standard | £0.12 | £0.75 | £1.00 | £0.040 | £0.030 | 16.00-18.00 |
| General | 0.040 | 0.30 | 0.45 | 0.020 | 0.004 | 16.30 |
5. Performance (JIS G 4305-2005)
| Differentiation | Mechanical properties | Machinability | |||||
| Ys (Mpa) | Ts (Mpa) | El (%) | Hv | CCV | LDR | Er (mm) | |
| Standard | ≥ 205 | ≥ 450 | ≥ 22 | ≤ 200 | – | – | – |
| General | 330 | 505 | 27 | 155 | 28.0 | 1.98 | 8.7 |
6. Physical Properties
| Density (g/cm3) | Magnetism | Resistance (10-6.W.cm) | Specific Heat250C (J/kg.0C) | Thermal Conductivity 1000C (W/m. 0C) | Coefficient of thermal expansion 20~1000C (10-6/0C) | Young’s Modulus 200C (Gpa) |
| 7.70 | Have | 53.6 | 460 | 26.0 | 10.4 | 219 |
7. Heat Treatment
Melting Point: 1425-15100C;
Annealing: 780-8500C.
8. Condition of Use
1) Annealed State:
NO.1, 2D, 2B, N0.4, HL, BA, Mirror, and various other surface treatment states.
9. Usage Precautions
- Relative to 304, has inferior stretchability and weldability;
- As it is ferritic stainless steel, it has lower strength and its work hardening capability is also low, which should be considered when choosing to use;
- After stretch forming, surface ridging defects may appear in the rolling direction, posing significant challenges to polishing operations.
