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Alloy 25252 Duplex S31050(1.4466) Duplex Stainless Steel Fasteners bolt nut
1.Chemical composition* of wrought high-performance austenitic stainless steels (wt. pct.)**
2.1.4466 Introduction
Stainless steels are high alloy steels which have high corrosion
resistance than other steels owing to the presence of large amounts
of chromium in the range of 4 to 30%. Stainless steels are
classified into martensitic, ferritic and austenitic based on their
crystalline structure. They also form another group known as
precipitation hardened steels, which are a combination of
martensitic and austenitic steels.
The following datasheet will provide more details about grade 2RE69
stainless steel alloy.
Chemical Composition
The following table shows the chemical composition of grade 2RE69
stainless steel alloy.
| Element | Content (%) |
| Iron, Fe | 48.6 |
| Chromium, Cr | 25 |
| Nickel, Ni | 22 |
| Molybdenum, Mo | 2.1 |
| Manganese, Mn | 1.7 |
| Silicon, Si | 0.4 |
| Nitrogen, N | 0.12 |
| Carbon, C | 0.02 |
| Phosphorous, P | 0.015 |
| Sulfur, S | 0.01 |
Physical Properties
The physical properties of grade 2RE69 stainless steel alloy are
given in the following table.
| Properties | Metric | Imperial |
| Density | 7.9 g/cm3 | 0.285 lb/in3 |
Mechanical Properties
The mechanical properties of grade 2RE69 stainless steel alloy are
displayed in the following table.
| Properties | Metric | Imperial |
| Hardness, Rockwell B | 95 | 95 |
| Tensile strength, ultimate | 580 - 780 MPa | 84100 - 113000 psi |
| Tensile strength, yield (@0.2%) | 270 MPa | 39200 psi |
| Elongation at break | 30% | 3% |
| Modulus of elasticity | 195 GPa | 28300 ksi |
Thermal Properties
The following table outlines the thermal properties of grade 2RE69
stainless steel alloy.
| Properties | Metric | Imperial |
| Thermal expansion co-efficient (@30-100�C/86-212�F) | 15.5 �m/m�C | 8.61 �in/in �F |
| Thermal conductivity (@20�C/68�F) | 13 W/mK | 90.2 BTU in/hr.ft�.�F |
Applications
The following are the major applications of grade 2RE69 stainless
steel alloy:
Urea strippers
Condensers
Decomposers
Reactor coils
