Sanicro®35 is a high alloy austenitic grade for service in
demanding wet corrosive environments.
The grade is characterized by:
Excellent resistance to
- Pitting corrosion
- Crevice corrosion in chloride environments
- Chloride-induced stress corrosion cracking
- Hydrogen embrittlement
Good resistance to
- Hydrochloric acid environments
- Sulfuric acid and nitric acid
Very high
- Tensile strength
- Ductility
Broad service temperature range
Standards
- ASTM: B649
- UNS: N08935
Approvals and Certificates
- Boiler and Pressure Vessel Code, Section VIII, Division I and II.
- ASME Code case 2982-1
- EN 10204 certificate 3.1
Non Destructive Examination
- ASTM A388/A388M / API 6A PSL3
Chemical composition (nominal)
| C | Si | Mn | P | S | Cr | Ni | Mo | Cu | N |
|---|---|---|---|---|---|---|---|---|---|
| ≤0.030 | ≤0.5 | 0.8 | ≤0.030 | ≤0.020 | 27 | 35 | 6.5 | 0.2 | 0.3 |
Applications
Due to its extremely good pitting and crevice corrosion properties, Sanicro® 35 is particularly suitable for applications in seawater and other high chloride concentration conditions.
Sanicro® 35 also has a high resistance to general corrosion in acid environments, making it suitable for a variety of applications.
The excellent mechanical and corrosion properties make Sanicro®35 an economical choice in many applications, by reducing the life cycle cost of equipment.
Sanicro®35 bars are semi-finished products with defined properties that can be machined to various components (such as flanges, valves, fittings, couplings, rings and seals, shafts, bolts and nuts) in applications highlighted below:
- Oil&Gas drilling tools
- Waste heat recovery exchangers
- Evaporators
- Off-shore piping systems
Corrosion resistance
General corrosion
Sanicro®35 has Excellent corrosion resistance, for service in sea-water applications and other highly corrosive environments.
Service temperatures up to 450°C.
The general corrosion resistance of Sanicro®35 in acids and alkalines is better than that of Alloy 825 / Sanicro®825, SAF®2507 and Sanicro®28.
Sanicro®35 is a suitable alternative to Alloy 625 / Sanicro®625, in presence of ammonia and hydrochloric acid. If that material type is considered for service.
Pitting and crevice corrosion
The localized corrosion resistance of Sanicro®35 in chloride containing environment is superior to that of Alloy 825 / Sanicro®825, SAF®2507 and Sanicro®28. And on par or better compared to Alloy 625 / Sanicro®625.
One of the main advantages of Sanicro® 35 is that it has excellent resistance
to pitting corrosion.
In natural seawater conditions at 30°C, the pitting corrosion resistance is excellent, and the crevice corrosion resistance is better than for Alloy 625 / Sanicro®625.
In chlorinated seawater Sanicro®35 is resistant to crevice corrosion at 45°C,
and resistant to pitting corrosion at 80°C
The Pitting Resistance Equivalent Value with Nitrogen included, PREN: >52
Stress corrosion cracking
Sanicro®35 has excellent stress corrosion cracking resistance (chlorides, H2S) and does not suffer from SCC in a NACE MR 0175 / ISO 15156 Test Level VI environment.
The resistance to hydrogen embrittlement is also excellent.
Sour service
The Sanicro®35 resistance to cracking in the presence of H2S and chlorides is very high.
Refinery sour water service – static and flowing conditions.
Sanicro®35 performs very well, at least on par with Alloy 625 / Sanicro®625 and SAF®2507.
Offshore sour service
Compared to Alloy 625 / Sanicro®625, Sanicro®35 has overall better corrosion resistance in marine environments.
And compared Alloy 825 / Sanicro®825, Sanicro®35 has superior corrosion resistance in chloride environments.
Fabrication
Machining
Materials in this group of alloys (UNS N08935) are challenging to machine.
This is due to a number of properties, leading to high cutting forces,
severe wear and poor chip control.
Dedicated cutting tools and strategies to be used.
For details on tool geometries, tool grades and cutting data, the tool supplier
should be able to support.
Forms of supply
Dimensions and finishes
Sanicro™35 bar steel is available in a large number of sizes. The standard size range for stock comprises 20-240 mm. Round bar is supplied in solution annealed and water quenched condition. The surface is peeled turned.
Lengths
Bars are delivered in random lengths of 3-7 m, depending on diameter.
Straightness
| Diameter (mm) | Height of arch, mm/m (typical value) |
| 20 - 70 | 1 |
| > 70 | 2 |
Tolerances, mm-sizes
| Diameter (mm) | Tolerances, mm |
| 20-35 | -0/+0.15 |
| 40-45 | -0/+0.16 |
| 50-70 | -0/+0.19 |
| 75-95 | -0/+1.00 |
| 100-240 | -0/+1.50 |
Surface conditions
Peeled: Ra max. 5 µm
Mechanical properties
The following figures apply to material in the solution annealed condition.
At 20°C (68°F)
Metric units
| Proof strength | Tensile Strength | Elongation |
| Rp0.2a | Rm | Ab |
| MPa | MPa | % |
| ≥350 | ≥700 | ≥40 |
Imperial units
| Proof strength | Tensile Strength | Elongation |
| Rp0.2a | Rm | Ab |
| ksi | ksi | % |
| ≥50 | ≥101 | ≥40 |
1 MPa = 1 N/mm2
a) Rp0.2 correspond to 0.2% offset yield strength.
b) Based on L0 = 5.65·S0 where L0 is the original gauge length and
S0 the original cross-section area.
c) Conversion from HBW. Reference ASTM E140
Impact strength
Typical values longitudinal direction
| Temperature | Impact strength |
| +20°C (68°F) | 240J (177 ft-lb) |
| -50°C (-58°F) | 230J (170 ft-lb) |
| -196°C (-320.8°F) | 170J (125 ft-lb) |
Physical properties
Density: 8.1 g/cm3, 0.29 lb/in3
Thermal conductivity
| Temperature, °C | W/(m °C) | Temperature, °F | Btu/(ft h °F) |
| 20 | 10.0 | 68 | 6.0 |
| 100 | 12.0 | 200 | 7.0 |
| 200 | 13.5 | 400 | 8.0 |
| 300 | 15.5 | 600 | 9.0 |
| 400 | 17.0 | 800 | 10.0 |
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
Metric units, x10-6/°C
| Temperature, °C | 30-100 | 30-200 | 30-300 | 30-400 |
| Sanicro® 35 | 14.0 | 14.5 | 15.0 | 15.5 |
| Carbon steel | 12.5 | 13.0 | 13.5 | 14.0 |
| ASTM 316L | 16.5 | 17.0 | 17.5 | 18.0 |
Imperial units, x10-6/°F
| Temperature, °C | 86-200 | 86-400 | 86-600 | 86-800 |
| Sanicro® 35 | 8.0 | 8.0 | 8.5 | 8.5 |
| Carbon steel | 7.0 | 7.0 | 7.5 | 8.0 |
| ASTM 316L | 9.5 | 9.5 | 10.0 | 10.0 |
Resistivity
| Temperature, °C | μΩm | Temperature, °F | μΩinch |
| 20 | 1.0 | 68 | 39 |
Modulus of elasticity, x103
| Temperature, °C | MPa | Temperature, °F | ksi |
| 20 | 190 | 68 | 28.0 |
| 100 | 185 | 200 | 27.0 |
| 200 | 180 | 400 | 26.0 |
| 300 | 175 | 600 | 25.0 |
| 400 | 170 | 800 | 24.5 |
Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Alleima materials.