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Nickel alloy sheet

Suntek Steel has an inventory of 800 alloy /800H alloy /800AT nickel alloy sheets with thickness ranging from 3/16" to 2" for use in chemical and petroleum processing equipment, power generation, heat treatment equipment and steel production。

3/16" 1/4" 3/8" 1/2" 5/8" 3/4"
4.8mm 6.3mm 9.5mm 12.7mm 15.9mm 19mm
 
1" 1 1/4" 1 1/2" 1 3/4" 2"
25.4mm 31.8mm 38.1mm 44.5mm 50.8mm

800 alloy (UNS NO8800), 800H alloy (UNS NO8810), 800AT (UNS NO8811) are alloys of nickel, iron and chromium for oxidation resistance and carburization at high temperatures。The 32% nickel alloy content makes the alloy resistant to chloride pressure corrosion fracture and sigma phase precipitate brittle-cracking。The alloy has strong resistance to general corrosion。In the case of solid melt annealing, 800H and 800AT have superior fracture resistance。

800,800H,800AT alloy specification details

Nickel-chromite is designed for oxidation resistance and carbonization。

常规特性

Alloy 800 (UNS NO8800), 800H(UNS NO8810), 800AT(UNS8811). Nickel-chromite alloys are designed to resist oxidation and carbonization at elevated temperatures。Nickel content of 32% increases the alloy's resistance to corrosion cracking caused by chloride and to brittleness caused by precipitation in the Sigma state。Excellent overall corrosion resistance。The 800H and 800AT alloys exhibit excellent creep resistance and fission resistance in solution annealing state。These three basic type 800 series alloy products have been approved for construction materials and are widely used in ASME boilers, pressurization valves, Electric boilers Section I, Nuclear matter vessels Section III and red high pressure vessels。

800, 800H and 800AT alloys are basically the same, but the difference is that the carbon content of 800H alloy is slightly higher (0.5-0.15), the content of aluminum and titanium in 800AT alloy is increased by 1%。Alloy 800 is generally used at a temperature of about 1100.F(593.C) in the environment。800H and 800AT alloys are commonly used for temperatures around 1100.Above F, such conditions require the alloy to be resistant to creep and fission。


应用范围

  • Chemical and petroleum processing equipment
  • 发电
  • Hot working plant
  • 炼纲

标准

ASTM..................B 409
ASME..................SB 409
AMS ...................5871

耐腐性

The content of chromium and nickel in 800, 800H and 800AT alloys is higher than that in 304 alloy family。In many applications, The performance of alloy 800, 800H and 800AT is similar to that of alloy 304。For example, it varies in most industrial and agricultural environments and in chemical media such as nitric and organic acids。Alloys 800, 800 h, 800 at, and 304 are not recommended for sulfuric acid applications unless the concentration and temperature are low。Similar to austenitic stainless steel, 800, 800H, and 800AT alloys are sensitized if they are heated to between 1000 and 1400 degrees Fahrenheit (538-760 degrees Celsius) for long periods of time (chromium carbide precipitation granulation)。Sensitized metals are susceptible to intergranular attack by certain corrosive agents, including acid or 65% nitric acid heated to boiling point (stainless steel corrosion resistance test)

Although 800 alloy can not completely resist cracking corrosion caused by stress, it has a high resistance to this kind of corrosion。Through a large number of field tests, 800 alloy has always shown its excellent properties in petroleum, chemical, food, pulp and paper industry equipment。Therefore, 800 alloy can show obvious advantages when used in moderate corrosion environment, while other Austenitic stainless steels have shown a tendency to be affected by stress cracking corrosion in application process。However, it is proved by extremely strict magnesium chloride test that 800 alloy is not completely free from stress fission corrosion。

化学分析

Typical Analysis (weight %)

 
合金800 0.02 1.00 0.020 0.010 0.35 21.0
Alloy 800 h 0.08 1.00 0.020 0.010 0.35 21.0
Alloy 800 at 0.08 1.00 0.020 0.010 0.35 21.0
  钛+ 铝
合金800 32.0 0.40 0.40 0.30
Alloy 800 h 32.0 0.40 0.40 0.30
Alloy 800 at 32.0 1.00 0.30

机械特性

The mechanical properties of 800, 800 h, and 800AT alloys at typical room temperature are shown in the table below。The 800 alloy is at 1800.F (928.C) annealing temperature of 800H alloy and 800AT alloy up to 2100.F (1149.C)。The difference of annealing temperature results in the difference of material strength。

机械特性 of 800 alloy

Test temperature Offset strength 0.2
华氏 摄氏 psi (MPa)
70 21 43,000 295
200 93 39,700 274
500 260 34,000 234
800 427 33,300 230
1000 538 31,700 219
1200 649 29,000 200
1400 760 22,600 156
1500 816 14,200 98
Test temperature In the end the tension Stretch ratio
华氏 摄氏 psi (MPa)  
70 21 87,700 600 44
200 93 81,700 563 43
500 260 76,200 525 39
800 427 74,600 514 40
1000 538 72,000 496 39
1200 649 54,000 372 56
1400 760 32,100 221 85
1500 816 24,800 171 91

机械特性 of 800H and 800AT alloys

Test temperature Offset strength 0.2
华氏 摄氏 psi (MPa)
70 21 29,000 200
200 93 24,100 166
600 316 19,000 131
800 427 18,100 125
1000 538 16,500 114
1200 649 14,800 102
1400 780 14,400 99
1600 871 11,600 80
1800 982 8,900 61
Test temperature In the end the tension Stretch ratio
华氏 摄氏 psi (MPa)  
70 21 77,000 531 52
200 93 71,000 490 53
600 316 66,600 459 53
800 427 65,800 454 53
1000 538 63,500 438 51
1200 649 55,700 384 50
1400 780 32,300 223 78
1600 871 18,600 128 120
1800 982 10,200 70 120

The property maintained by a body that heats up for a short time
The table above shows the tensile properties of alloy 800, Alloy 800H and alloy 800AT at high temperatures for a short period of time。The lower strength of alloy 800H and 800AT is due to the larger particles produced by heat treatment at 2100 ° F (1149 ° C), providing better creep, compression and fracture resistance。Annealing of alloy 800 at 1800 ° F (982 ° C) produces fine particles that provide good plasticity under cooling conditions。

物理特性

密度
0.29 g/cm3 (8.03 lbs/in3)

The resistance coefficient of
99 Microhm-cm at 70 °F (21 °C)

Magnetic permeability
<1.02

Specific heat
(32°-212 °F)          0.12 Btu/lb - ° F
(0°-100 °C)            Joules/kg - 500 ° K

Mean coefficient of thermal expansion line

Temperature range µm / °F µm / °C
华氏 摄氏
70-200 21-93 7.9 14.2
70-300 21-149 8.4 15.1
70-400 21-204 8.6 15.5
70-500 21-260 8.8 15.8
70-600 21-316 9.0 16.2
70-800 21-427 9.2 16.6
70-1000 21-538 9.4 16.9
70-1200 21-649 9.6 17.3
70-1400 21-760 9.9 17.8

Thermal conductivity

Temperature range BTU / h - ft ° F W / m / °K
华氏 摄氏
70 21 6.7 11.6
70-800 21-427 10.6 18.3
70-1800 21-982 17.8 30.8

抵抗氧化

Alloys are especially suitable for high temperature environments, such as furnaces and related heating devices, for reforming units and hydrocracking units in the petrochemical industry, and nuclear and conventional power plants to deal with superheated steam units。Due to the high content of chromium and nickel in the alloy, it has high oxidation resistance, rust resistance and good carburizing resistance。

The following oxidation reaction data were obtained by exposing 800 alloy samples to a specified temperature for 100 hours in still air and cooling。In general, when the added total weight exceeds 100mg/cm2, increasing the exposure time at the specified temperature will result in failure。

Since oxidation rates are greatly influenced by heating and cooling rates and the surrounding atmosphere, the data presented here are only approximate indicators。

Continuous oxidation test in stationary air for 100 hours

合金 Additional weight of sample
1700°F
(927°C)
1800°F
(982°C)
1900°F
(1038°C)
800合金 0.77 1.8 2.09
309合金 0.80 1.2 2.1
310合金 0.80 1.1 2.6
合金  Additional weight of sample
2000°F
(1093°C)
2100°F
(1149°C)
800合金 2.1 5.06
309合金 2.5 4.0
310合金 3.2 5.2

热处理

The annealing process of the 800 alloy is carried out in the range of 1800-1900 degrees Fahrenheit (982-1038 degrees Celsius) in order to soften the material and maintain a smaller particle fineness after forming。

热处理 of 800H\800AT alloys is usually performed between 2050 and 2150 degrees Fahrenheit (1121 to 1177 degrees Celsius)。In addition to softening the material after forming, Another purpose is to form coarse-grained particles that increase resistance to creep and fracture stress。

冷成型

800, 800H, and 800AT alloys have excellent cold forming properties usually associated with chrome-nickel stainless steels。The high nickel content can prevent the transformation of austenitic steel into martensitic steel, which can occur during cold treatment of 301 and 304 alloy。800, 800H, 800AT alloy compared with 301, 304 alloy, its cold work hardening rate is lower, can be used in a variety of wire drawing molding operations, relatively more deformation occurs during annealing。

The result of annealing 800H and 800TH alloy is that after forming, the coarse grain will produce a distinct corrugated surface called "orange peel".

焊接

800, 800H, and 800AT alloys can be connected by tungsten arc, gas consumable electrode, or electrode welding technology. Electrodes and wires for welding alloys are available commercially。The surface of these alloys forms rust with strong adhesion, which can only be removed by friction and inert gas protection。

The technical data and information provided here represent our best knowledge at present, however, due to our ongoing research on the corrosion rating project, these data and information may change slightly, therefore, we recommend that you approve with us when placing orders and inquiring。In addition, the actual conditions for each application have its particularity。The data provided here is for descriptive purposes only, and the data and information are subject to official written confirmation by our company。