Sanicro (28
Sanicro 28/35
Sanicro 28
Sanicro 28 is a high-alloy multi-purpose austenitic stainless steel with high levels of nickel and chromium, known for its corrosion resistance in a wide range of aggressive environments.
Common products made from Sanicro steel include:
Tubes and Pipes: Sanicro steel tubes and pipes are widely used in industries such as power generation, chemical processing, and oil and gas refining. They are favored for their ability to withstand high temperatures and aggressive chemical environments.
Fittings and Flanges: These components are essential for connecting Sanicro steel tubes and pipes in various systems. They are designed to maintain integrity under extreme conditions, including high pressures and temperatures.
Plates and Sheets: Sanicro steel plates and sheets are utilized in applications requiring corrosion resistance and high strength, such as heat exchangers, boilers, and pressure vessels.
Bars and Rods: Sanicro steel bars and rods find applications in structural components, fasteners, and machined parts where corrosion resistance and durability are critical.
Forgings: Forged Sanicro steel components, including valves, fittings, and shafts, are engineered to provide superior performance in demanding environments, such as chemical processing plants and power generation facilities.
Wire and Welding Consumables: Sanicro steel wire and welding consumables are used for joining and fabrication purposes, ensuring that the resulting welds maintain the corrosion resistance and mechanical properties of the base material.
Heat Exchangers: Sanicro steel is commonly used in the construction of heat exchangers, particularly in applications involving aggressive fluids or high-temperature processes.
Application
Sanicro 28 finds application in various industries like Chemical Processing Industry, Oil and Gas Industry, Power Generation, Power Generation, Pulp and Paper Industry, Water Treatment, Aerospace Industry, Pharmaceutical Industry, Mining and Metallurgy & Food and Beverage Industry Sanicro 28’s resistance to corrosion, especially in acidic and chloride-rich environments, makes it a versatile material in industries where durability, reliability, and longevity are essential
Chemical Compositions Sanicro 28
| Elements | % present |
|---|---|
| Nickel (Ni) | 30-32% |
| Chromium (Cr) | 26-28% |
| Molybdenum (Mo) | 3-4% |
| Copper (Cu) | 0.8-1.4% |
| Nitrogen (N) | 0.15-0.25% |
| Carbon (C) | 0.02% |
| Manganese (Mn) | 2.00% |
| Silicon (Si) | 1.00% |
| Phosphorus (P) | 0.03% |
| Sulfur (S) | 0.01% |
Mechanical Properties Sanicro 28
| Mechanical Properties | Values |
|---|---|
| Tensile Strength (at RT) | 600-750 MPa |
| Yield Strength (0.2% offset) | 300-350 Mpa |
| Elongation (at RT) | 35-45% |
| Hardness (Brinell) | 160 max |
| Impact Strength | Good |
Processing / Welding
- Welding Methods
- Preheating and Interpass Temperature
- Heat Input
- Post-Weld Heat Treatment
- Avoid Contamination
- Use Dedicated Tools:
- Post-Weld Cleaning and Passivation:
- Consultation with Experts
- Testing
Sanicro 35
Sanicro 35 alloy combines the greatest qualities of a nickel alloy with those of super austenitic stainless steel. Excellent corrosion resistance makes this grade suitable for use in severely corrosive settings, including seawater.
Application Sanicro 35
Sanicro 35 is especially well-suited for applications that use seawater for cooling or heating because of its excellent pitting and crevice corrosion characteristics. Sanicro 35 is also highly resistant to general corrosion in acidic environments, making it ideal for a wide range of applications.
Chemical Composition
| Chemical composition (nominal) % | |||||
|---|---|---|---|---|---|
| C | SI | MN | P | S | CR |
| ≤0.030 | ≤0.5 | 0.8 | ≤0.030 | ≤0.020 | 27 |
Mechanical Properties Sanicro 35
Metric units
| Proof strength | Tensile Strength | Elongation |
|---|---|---|
| Rp0.2a | Rm | A2 |
| MPa | MPa | % |
| ≥425 | ≥750 | ≥35 |
Imperial units
| Proof strength | Tensile Strength | Elongation |
|---|---|---|
| Rp0.2a | Rm | A2” |
| ksi | ksi | % |
| ≥62 | ≥109 | ≥35 |
1 MPa = 1 N/mm2
a) Rp0.2 and Rp1.0 corresponds to 0.2% and 1.0% offset yield strength.
b) Based on L0 = 5.65 √S0 where L0 is the original gauge length and S0 the original cross-section area.
At high temperatures
Intermetallic phases precipitate at temperatures exceeding 600°C (1110°F). As a result, the steel should not be subjected to these temperatures for extended durations.
Metric units
| Temperature | Proof strength | Tensile strength | Elongation |
|---|---|---|---|
| Rp0.2 | Rm | A | |
| °C | MPa | MPa | % |
| Min. | Min. | Min. | |
| 100 | 350 | 680 | 35 |
| 200 | 300 | 620 | 35 |
| 300 | 275 | 600 | 35 |
| 400 | 250 | 580 | 35 |
Imperial units
| Temperature | Proof strength | Tensile strength | Elongation |
|---|---|---|---|
| Rp0.2 | Rm | A | |
| °F | ksi | ksi | % |
| Min. | Min. | Min. | |
| 200 | 51 | 98 | 35 |
| 400 | 43 | 90 | 35 |
| 600 | 39 | 87 | 35 |
| 800 | 36 | 84 | 35 |
Physical Properties Sanicro 35
Density: 8.1 g/cm3, 0.29 lb/in3
Thermal conductivity
| Temperature, °C | W/(m °C) | Temperature, °F | Btu/(ft h °F) |
|---|---|---|---|
| 20 | 10 | 68 | 6 |
| 100 | 12 | 200 | 7 |
| 200 | 13.5 | 400 | 8 |
| 300 | 15.5 | 600 | 9 |
| 400 | 17 | 800 | 10 |
Specific heat capacity
| Temperature, °C | J/(kg °C) | Temperature, °F | Btu/(lb °F) |
|---|---|---|---|
| 20 | 450 | 68 | 0.11 |
| 100 | 470 | 200 | 0.11 |
| 200 | 500 | 400 | 0.12 |
| 300 | 510 | 600 | 0.12 |
| 400 | 530 | 800 | 0.13 |
Thermal expansion Sanicro 35
Metric units, x10-6/°C
| Temperature, °C | 30-100 | 30-200 | 30-300 | 30-400 |
|---|---|---|---|---|
| Sanicro® 35 | 14 | 14.5 | 15 | 15.5 |
| Carbon steel | 12.5 | 13 | 13.5 | 14 |
| ASTM 316L | 16.5 | 17 | 17.5 | 18 |
Imperial units, x10-6/°F
| Temperature, °C | 86-200 | 86-400 | 86-600 | 86-800 |
|---|---|---|---|---|
| Sanicro® 35 | 8 | 8 | 8.5 | 8.5 |
| Carbon steel | 7 | 7 | 7.5 | 8 |
| ASTM 316L | 9.5 | 9.5 | 10 | 10 |
Resistivity
| Temperature, °C | μΩm | Temperature, °F | μΩinch |
|---|---|---|---|
| 20 | 1 | 68 | 39 |
Modulus of elasticity, x103
| Temperature, °C | MPa | Temperature, °F | ksi |
|---|---|---|---|
| 20 | 190 | 68 | 28 |
| 100 | 185 | 200 | 27 |
| 200 | 180 | 400 | 26 |
| 300 | 175 | 600 | 25 |
| 400 | 170 | 800 | 24.5 |
Processing / Welding
Sanicro 35 has good weldability, and TIG welding (GTAW) is a suitable fusion welding process.
Welding should be done with a modest heat input of no more than 1.2 kJ/mm and a maximum interpass temperature of 100 °C. A stringer welding technique should be utilized. Preheating and post-weld heat treatment are unnecessary. To ensure that the welded joint retains its complete corrosion resistance, welding must be followed by careful cleaning to remove all oxides and heat tint. Ar + 2%N2 is recommended as a shielding and backing gas for TIG welding to get the best mix of mechanical qualities and corrosion resistance in the welded joint.
Welding austenitic stainless steels and nickel-base alloys frequently results in the risk of hot cracking in the welded joints.
