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Product Details:
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| Material: | Alloy 926, UNS N08925, UNS N08926, A Super Austenitic Stainless Steel | ||
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| Highlight: | stainless steel alloy,austenitic stainless steel |
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Super austenitic stainless steel Alloy 25-6MO (Alloy 926, N08926) semi-products for food processing
1 PRODUCT
Super austenitic stainless steel Alloy 25-6MO semi-products for food processing.
Alloy 25-6MO standard semi-product forms include sheet, strip, plate, round bar, flat bar, forging, hexagon, ring, disc, wire and fastener etc.
2 EQUIVALENT DESIGNATION
Alloy 926, UNS N08925, UNS N08926, W.Nr. 1.4529, X1NiCrMoCuN25-20-7, Incoloy ® alloy 25-6MO, Cronifer 1925 hMo
3 APPLICATION
Applications of Alloy 25-6MO include chemical and food processing, pulp and paper bleaching plants, marine and offshore platform equipment, salt plant evaporators, air pollution control systems, and condenser tubing, service water piping, polished rods in corrosive wells, and feedwater heaters for the power industry.
It has good corrosion resistance and stability in oxidizing and reducing media, with mechanical properties slightly better than 904L. It can be used in the manufacturing of pressure vessels from -196°C to 400°C.
4 OVERVIEW
Alloy 25-6MO is a super austenitic stainless steel containing 6% molybdenum and enhanced by an addition of nitrogen. The nickel and chromium contents of this alloy make it resistant to a wide range of corrosive environments. The alloy is especially resistant to non-oxidizing acids such as sulfuric and phosphoric. The high molybdenum content and nitrogen provide resistance to pitting and crevice corrosion, while copper enhances resistance to sulfuric acid.
Alloy 25-6MO is a fully austenitic alloy containing 6% molybdenum and offering excellent corrosion resistance in a wide variety of aggressive, aqueous environments. It replaces the conventional, austenitic stainless steels (AISI 316 and 317), where their capabilities are pushed to their performance limits. The alloy, therefore, falls into a "super austenitic stainless steel" category. It can also represent a cost-effective alternative to the higher nickel alloys in some marine and chemical processing environments.
One of the outstanding attributes of Alloy 25-6MO is its resistance to environments containing chlorides or other halides. This alloy is especially suited to handle high-chloride environments such as brackish water, sea water, caustic chlorides and pulp mill bleach systems.
Features:
● It has high resistance to point corrosion and crevice corrosion in halide medium and acid medium containing H2S
● It can effectively resist chloride ion stress corrosion cracking in practical application
● It has excellent corrosion resistance to all kinds of corrosion in the usual REDOX environment
● The mechanical properties were greatly improved than Cronifer 1925LC-alloy 904L.
● The metallurgical stability was improved than those alloys with 18% nickel content.
5 CHEMICAL COMPOSITION (wt%):
Table 1 (wt%) as per ASTM B649
| Fe | Ni | Cu | Cr | Mo | N |
| Balance | 24.0-26.0 | 0.5-1.5 | 19.0-21.0 | 6.0-7.0 | 0.15-0.25 |
| C | Mn | Si | P | S | |
| ≤0.02 | ≤2.0 | ≤0.50 | ≤0.030 | ≤0.010 |
6 PHYSICAL PROPERTY
Density at 20°C: 0.29 lb/in3 (8.10g/cm3)
Melting range: 1320-1390°C.
| Temperature | Specific heat | Thermal conductivity | Electric resistivity | Modulus of elasticity | Coefficient of expansion |
| ℃ | J/Kg K | W/m K | μΩcm | KN/mm2 | 10-6/K |
| 20 | 415 | 12 | 96 | 193 | |
| 100 | 435 | 12.9 | 99 | 186 | 15.5 |
| 200 | 470 | 14.4 | 104 | 179 | 16.2 |
| 300 | 495 | 16.5 | 108 | 173 | 16.4 |
| 400 | 510 | 18.5 | 112 | 168 | 16.6 |
| 500 | 520 | 20.1 | 115 | 163 | 16.7 |
| 600 | 525 | 21.6 | 117 | 17.1 |
7 MECHANICAL PROPERTIES
Typical mechanical properties of plate, strip, bar, wire, cold finished and hot finished annealed, all sizes except where noted, forging quality all sizes.
|
Tensile Strength min. KSI (MPa) |
Yield Strength (0.2% Offset) |
Yield Strength (1.0% Offset) |
Elongation in 2" (50.8mm), min, % |
| 94(650) | 43(295) | 49(340) | 35 |
Note: No tensile properties are required on forging quality.
For cold finished and annealed wire only, tensile strength 90-120psi (620-830 MPa).
8 CORROSION RESISTANCE
Alloy 25-6MO is an austenitic stainless steel with similar chemical composition to alloy 904L. The nitrogen content is increased to about 0.2% and the molybdenum content is about 6.5%. The increase of nitrogen and molybdenum content significantly improved the resistance to pitting corrosion and crevice corrosion in the halide medium. This test was conducted in the severe pitting corrosion temperature range in the standard ferric chloride solution.
At the same time, nickel and nitrogen not only ensure the metallographic stability, but also reduce the tendency of intercrystalline phase precipitation in the process of hot processing or welding than the alloy with low content of nickel and nitrogen.
Excellent local corrosion resistance and 25% nickel content make the alloy especially outstanding corrosion resistance in chloride medium.
Tests in various FGD systems of limestone slurry with chloride concentrations of 10000-70000ppm, PH values of 5-6 and operating temperatures of 50-68°C showed that, after 1-2 years of testing, Alloy 25-6MO has basically no pitting corrosion and crevice corrosion.
Alloy 25-6MO is also highly corrosion resistant in other chemical media, as well as high temperature and high concentration media, including acid gas of sulphate phosphate, sea salt and organic acid.
Alloy 25-6MO is the material selection for chapter 6 (Code for storage and transportation containers for dangerous goods) of the BAM catalogue of the German national institute for materials research and testing (BAM) in Berlin.
In addition, only when the material is in the correct metallurgical state and clean conditions can have the best corrosion resistance.
9 WORKING INSTRUCTION
Alloy 25-6MO suitable for hot and cold machining and machining, but because of high strength, hot and cold machining requires high power processing equipment.
Hot forming
Alloy 25-6MO can be hot worked at temperature ranges of 900-1200°C, followed with water quenching or fast air cooling.
When heating, the material can be directly fed into the furnace with the highest temperature. After enough time of heat preservation (60 minutes for each 100mm thickness), the material will be quickly baked out. When the temperature of the material falls below the temperature of hot processing, it shall be reheated
In order to obtain the best performance, the solid solution treatment should be carried out after hot processing.
Cold forming
As with all austenitic Cr-Ni stainless steels, the working hardening rate of the alloy is high, so it is necessary to select the cold working material for the processing equipment to be in the state of solid solution heat treatment, and the intermediate annealing should be carried out when the amount of cold working is large.
If the amount of cold processing is more than 15%, the workpiece needs to be treated with secondary solid solution.
Heat treatment
Alloy 25-6MO should be solution annealed at temperatures 1150-1200°C, prefered 1170°C.
Machining
Machining should be carried out after the heat treatment, due to the hardening of the material, in order to cut into the surface layer of cold hardening, machining of Alloy 25-6MO should be done at a slightly lower cutting speed when compared stainless steel using rigid tooling and optimum lubrication and cooling.
10 STANDARD SPECIFICATION
EN 10088-1 Composition
EN 10088-2 Plate, strip
EN 10088-3 Bars
ASTM B625 / ASME SB625 Plate, strip
ASTM B649 / ASME SB649 Bars
ASTM B677 / ASME SB677 Seamless pipe
ASTM B673 / ASME SB673 Welded pipe
ASTM B674 / ASME SB674 Welded pipe
ASME code case N453-1 Seamless pipe
ASME code case N453-2 Welded pipe
ASME code case N454 Plate, bar
ASME code case N455 Forging
ASME code case 161 Seamless pipe, welded pipe, plate, strip, bar, forging
ASME code case 2120 Seamless pipe, welded pipe, plate, strip, bar, forging
VdTÜV-Wbl 502 Seamless pipe, plate, bar
11 COMPETITIVE ADVANTAGE:
(1) More than 50 years experience of research and develop in high temperature alloy, corrosion resistance alloy, precision alloy, refractory alloy, rare metal and precious metal material and products.
(2) 6 state key laboratories and calibration center.
(3) Patented technologies.
(4) Ultra-purity smelting process: VIM + IG-ESR + VAR
(5) Excellent high performance.
12 BUSINESS TERM
| Minimum Order Quantity | Negotiable |
| Price | Negotiable |
| Packaging Details | water prevent, seaworthy transport, mill’s export standard packing |
| Mark | As per order |
| Delivery Time | 60-90 days |
| Payment Terms | T/T, L/C at sight, D/P |
| Supply Ability | 300 metric tons per month |
Contact Person: Mr. lian
Tel: 86-13913685671
Fax: 86-510-86181887
