Sanmac 2205 (Hollow Bar) (UNS S31803/S32205)
Penerangan:
Sanmac® 2205 is a 22% Cr duplex stainless steel, supplied in the solution annealed condition, with improved machinability as standard. As a duplex stainless steel, it combines the desirable aspect of properties of both austenitic and ferritic grades. The high chromium, molybdenum and nitrogen contents results in a Pitting Resistance Equivalent number (PREN) of 33-34, providing pitting and crevice corrosion resistance superior to Alloy 316L or Alloy 317L austenitic stainless steels in almost all corrosive media. Due to its excellent corrosion properties, it is well-suited to environments containing chlorides and hydrogen sulphide, for use in oil & gas extraction from sour wells, in refineries and in process solutions contaminated with chlorides.
It also has good erosion fatigue properties as well as lower thermal expansion and higher thermal conductivity than austenitic steels. The yield strength is about twice that of austenitic stainless steels, allowing a designer to save weight and make the alloy more cost competitive when compared to Alloy 316L or Alloy 317L.
Sanmac® 2205 has been developed to provide superior machinability as standard. Control of composition and inclusion type results in improved chip formation and reduced tool wear, providing great machining productivity and lower tool costs.
Ciri-ciri utama:
- Higher strength than standard stainless steels
- Higher corrosion resistance than Alloy 316L stainless steel in a wide variety of corrosive chemicals including sulphuric, phosphoric and nitric acids
- Good resistance to pitting and crevice corrosion in seawater
- High stress corrosion resistance
- Lower thermal expansion than austenitic stainless steels
- Higher thermal conductivity than austenitic stainless steels
Permohonan:
- Process industry components in sulphuric acid, nitric acid, phosphoric acid, ethylene oxide, polypropylene & PVC production
- Equipment handling organic & fatty acids, chemical storage, tankers, heat exchangers
- Marine industry and shipbuilding propellers, shafts, rudders, shaft seals, pumps, bolts, fasteners, valves, instrumentation
- Oil and chemical tankers
- Oil & Gas industry pumps, valves, pipe, vessels, wellhead equipment, subsea equipment, separators, heat exchangers
- Pollution control systems, effluent scrubbing, flue gas desulphurisation (FGD)
- Waste water treatment, sour water purification
- Pulp & paper industry applications such as pulp liquor heaters, bleach tower linings, digesters, brownstock washers
- Food industry applications including brewery piping, evaporators, hot liquor tanks, presses
Komposisi kimia:
| Cr | Ni | Mo | Co | Nb (+Ta) | Ti | V | W | Cu | C | Mn | N | Si | P | S | Fe | Al | |
| Minimum | 22.50 | 4.50 | 3.20 | 0.14 | |||||||||||||
| Maksimum | 23.00 | 6.50 | 3.50 | 0.03 | 0.20 | 1.00 | 0.030 | 0.015 | Bal |
Hartanah Mekanikal:
| 0.2% Kekuatan Bukti | 450 N/mm2 | 65.0ksi |
| Kekuatan tegangan | 680 N/mm2 | 99.0ksi |
| Pemanjangan, 5.65√S0 | 25% | |
| Pengurangan kawasan | ||
| Hardness (Rockwell C) | 28 (max) | |
| Kekuatan Impak (Suhu bilik) | 80J (av) | |
| Kekuatan Impak (-46oC) | 45J (av) | |
| 35J min | ||
Nota:
- Testing shall be carried out in accordance with ASTM A370 or EN ISO 6892-1 (tensile), EN ISO 6506-1 (hardness)
- Minimum properties quoted (tested at room temperature in a longitudinal direction)
- Testing performed on each melt of material per heat treatment batch
- Hardness shall be in accordance with NACE MR 1075
- For hollow bar with a maximum wall thickness of 20mm (0.79”)
- Additional tests routinely undertaken:
- ASTM G48A corrosion test (at 50degC) No pitting and < 4.0g/m2 weight loss
- Ferrite content 35-55%
- Microstructure certified free from grain boundary carbides, sigma, chi and laves phases
Ciri-ciri fizikal:
| Ketumpatan (Kg/m3) | 7810 |
| Permeability Magnetic (20°C) | <50 |
| Young’s Modulus (kN/mm2) | 190 |
| Rintangan elektrik tertentu, 20°C (µΩ.m) | 0.85 |
| Pengembangan terma, 20-300°C (m/m/oC) | 13 x 10-6 |
| Haba tertentu, 20°C (J/kg.K) | 480 |
| Kekonduksian terma, 20°C (W/m.K) | 14 |
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Datasheet - SD-Sanmac 2205 Hollow Bar (rev2)