Sep 26 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Welding
Hot Working
Cold Working
Annealing
Hardening
Applications
Introduction
Stainless steels are called as high-alloy steels. Due to the presence of large amounts of chromium in the range of 4 to 30%, they have high corrosion resistance than other steels. Stainless steels are classified into martensitic, ferritic and austenitic based on their crystalline structure. However, stainless steels present in the form of a combination of martensitic and austenitic steels are known as precipitation-hardened steels.
The following datasheet will provide more details about grade 330 stainless steel, which has high strength and resistance to carburization and oxidation at 1200°C (2200°F).
Chemical Composition
The following table shows the chemical composition of grade 330 stainless steel.
| Element |
Content (%) |
| Iron, Fe |
42 |
| Nickel, Ni |
36 |
| Chromium, Cr |
19 |
| Manganese, Mn |
2 |
| Silicon, Si |
1.13 |
| Carbon, C |
0.080 |
| Phosphorous, P |
0.040 |
| Sulfur, S |
0.030 |
Physical Properties
The physical properties of grade 330 stainless steel are given in the following table.
| Properties |
Metric |
Imperial |
| Density |
8 g/cm3 |
0.289 lb/in³ |
Mechanical Properties
The mechanical properties of annealed grade 330 stainless steel are displayed in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength, ultimate |
550 MPa |
79800 psi |
| Tensile strength, yield (@0.2%) |
260 MPa |
37700 psi |
| Modulus of elasticity |
197 GPa |
28600 ksi |
| Poisson’s ratio |
0.27 – 0.30 |
0.27 – 0.30 |
| Elongation at break (in 50 mm) |
40% |
40% |
Thermal Properties
The following table outlines the thermal properties of grade 330 stainless steel.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient |
14.4 µm/m°C |
8 µin/in°F |
| Thermal conductivity |
12.5 W/mK |
86.8 BTU in/hr.ft².°F |
Other Designations
Other designations that are equivalent to grade 330 stainless steel include the following.
- AMS 5592
- AMS 5716
- ASTM B366
- ASTM B511
- ASTM B512
- ASTM B535
- ASTM B536
- ASTM B546
- ASTM B710
- ASTM B739
- DIN 1.4333
- DIN 1.4864
- SAE 30330
- SAE J405 (30330)
- SAE J412 (30330)
Fabrication and Heat Treatment
Machinability
Rigid mounts, sulfurized lubricants, positive feeds and slow speeds are recommended for machining grade 330 stainless steel.
Welding
Grade 330 stainless steel can be welded using GAW techniques.
Hot Working
Hot working of grade 330 stainless steel can be performed at 1149 to 1177°C (2100 to 2150°F).
Cold Working
It is difficult to perform cold working in grade 330 stainless steel as the steel has high strength and work hardening rate. However, this steel can be cold worked using strong forces.
Annealing
Grade 330 stainless steel can be annealed at 1121 to 1204°C (2050 to 2200°F).
Hardening
Grade 330 stainless steel is unresponsive to heat treatment. It can be hardened only through cold reduction.
Applications
The following are the major applications of grade 330 stainless steel:
- Gas turbines
- Heat exchangers
- General heat treating equipment
- Neutral and cyanide salt pots