Introduction of the Stainless Steel Grade 430
1. Summary
Containing 17% Cr, it exists as a mixed phase (α+γ) at high temperature, and below 1000OC is an α single-phase BCC structure.
Ferritic stainless steel is widely used.
2. Features
1) Excellent deep drawing performance, similar to 304 steel;
2) It has strong corrosion resistance to oxidizing acids, and certain corrosion resistance to lye and most organic and inorganic acids; its stress corrosion and cracking resistance is stronger than that of 304 steel;
3) The coefficient of thermal expansion is lower than 304 steel, with high oxidation resistance, suitable for heat-resistant equipment;
4) The appearance of cold-rolled products is bright and beautiful;
5) Compared with 304, the price is cheaper, and it is used as an alternative to 304 steel.
3. Scope of application
It is mainly used for high-polishing decoration purposes in a mild atmosphere, such as the surface of gas stoves, home appliance parts, tableware, interior decoration of buildings, sinks, washing tubs, etc.
4. Chemical composition (JISG 4305-2005) (wt%)
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)
Distinguish | Mechanical properties | Processing performance | |||||
| 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) | Magnetic | Resistance (10-6.W.cm) | Specific heat 250C(J/kg.0C) | Thermal conductivity 1000C(W/m.0C) | Thermal expansion rate 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. Use status
1) Annealing states:
NO. 1, 2D, 2B, N0.4, HL, BA, Mirror, and various other surface treatment states
9. Precautions for use
-Relative to 304, the tensile performance and welding performance are poor;
Because it is ferritic stainless steel, the strength is relatively low, and the work hardening ability is also low, so you should pay attention when choosing and using it;
After the stretching process, strip defects (ridging) in the rolling direction will appear on the surface, which brings great difficulties to the polishing operation.